Qiangsun 30A charge/load controller
evaluation

First posted
Tuesday December 30, 2014 15:28
Updated
Saturday February 28 2015 07:46

_____


Saturday February 28 2015 07:46

Wire size vs I and V in focus.

200w POWER iNVERTER

Cables 12 AWG x 23”



Monday February 16, 2015 08:53

400 W HF inverter connected to 12V 35Ah AGM battery.

Kill A Watt plugged into inverter.

IR drops measured from battery + to inverter input and inverter - to battery terminal measured in mV.



Loads of several cfl's and Rival crock pot low and high






400 W 23 inch 5 mm [~4 AWG] to battery terminal can be used as shunt to measure current flowing from battery into inverter? 

crockpot.xls.

Kill A Watt measures AS Watts and Amps at about 120V.

More power has to go IN than comes OUT.

IN about 13V.

So IN Amps to power a 100 W AC load would have to be greater than 100/13 = 7.69A DC?
Reason for experimentation is that the HQRP is load output limited to 10A, Qiangsun, 30A.

HF technology makes these experiments possible for $ reasons.

Inverter and Kill A Watt consume DC power too.

Notes
Monday February 16, 2015 11:40

1 why shunt between load and ground.

2 Drok schematic uses low side shunt placement.

3 What’s The Difference Between High-Side And Low-Side Current Sensing?

4 High-side versus low-side current sensing.

When monitoring load current the designer can choose to place the sense resistor either between the supply voltage (Vbus) and load, or between the load and ground. The former is called high-side sensing whereas the latter is called low-side sensing. ...

Low-side sensing is desirable because the common-mode voltage is near ground, which allows for the use of single-supply, rail-to-rail input/output op amps.

5 Low Side Current Sensing with Remote Shunt Resistor.




6??

Sunday February 15, 2015 07:21

ir drop by wire size voltage amperage.

HF 400W invereter cables specs.







"The Grape Solar 100W come with two 900mm leads, ..."

1 Wire gauge?
2 "MC4 Cable 2' length"?
3 "400W AC - Parallel"?
4 Limited warranty?

Grape questions conversation.

Dennis did not report bad Grape failure rates.

Altenergy liberal arts 'educated' msm writers at work?
That awful power, the public opinion of a nation, is created in America by a horde of ignorant, self-complacent simpletons who failed at ditching and shoemaking and fetched up in journalism on their way to the poorhouse. -

Mark Twain "License of the Press" speech

Where do journalists come from? They are manufactured in America's universities in a liberal arts curriculum.

Mark Mathis

900mm to inches. 2 feet?

failure rate solar panels.

Everyone has heard the pitch for solar energy, install solar cells on your roof and get free electricity from the sun. Sure they cost a lot up front, but they will last 25-30 years—which just happens to be about the payback time given current electricity rates from coal, nuclear and natural gas. So when the solar panels start failing in two or three years the economics of solar power collapses like a house of cards. That is exactly what is happening around the world. ...

Most of the concerns over quality center on China, home to the majority of the world’s solar panel manufacturing capacity. [MSM bs?]

After incurring billions of dollars in debt to accelerate production that has sent solar panel prices plunging since 2009, Chinese solar companies are under extreme pressure to cut costs.

Chinese banks in March, for instance, forced Suntech into bankruptcy. Until 2012, the company had been the world’s biggest solar manufacturer.

[Articles may reflect msm writers writing for the US solar industry.Who is paying these writers?]

“If you don't read the newspaper, you're uninformed. If you read the newspaper, you're mis-informed.”
Mark Twain. Same applies to msm liberal arts 'educated' altenergy writers?


Affordable Solar replaced panel?

arrived from Bantian, LongGang, Shenzhen today.
Looks sturdy.


Tuesday February 10, 2015 13:47

Five arrived Monday February 9.



 


1 MC4 male/female pins. Plug and socket in usb couth parlance.
2 Packaging apparent problems resolved.

#10 AWG wire important for high amp, low voltage apps, we discover.





http://www.prosefights.org/irp2014/ut310.htm#bangladesh

Friday February 6, 2015 09:50

Grape 100W ready to input power into Qiangsun!



Qiangsun 30A charge/load controller with free Harbor Freight monitoring meters.



15W Harbor Freight monocrystalline panel seen charging 12V 35Ah AGM Harbor Frieght battery.

Charge/load controller from a microcontroller system view point of Input, Output and Input/Output.

Solar panel = I
Load = O
Battery = I/O
DPW Solar employee reported that electric gate charge/load controller connected directly to battery, not load.

Employee questioned reason.

Wire size is proving critical with higher Amp loads.

Charge/load controller may be unable to handle gate motor Watts?
Free HF DM appears to have successfully measured about 6A produced by Grape. But this is when the meter shorted the Grape.

HQRP screeching show that when the volts increase, the DM's cannot be used to measure Amps.

This is why switch to shunt and IR drop mesurement to measure Amps

1 Grape/Qiangsun overview.

2 Air-powered rotary tool did not work as well expected.

Battery powered reciprocating saw used to finish job.

Thursday February 5, 2015 08:44

Testability important issue with any system.

No test points [TP1, 2, ....] = bad design.

Clip leads attached beneath



allow testability.

#10 AWG leaded with bernzomatic propane torch.



Mass to great to lead with solder station

Open circuit Grape 100W polycrystalline panel voltage test.



Both test probes and shunt wires tested.

Closed circuit Grape current test video.
TracFone LG L39C Android cell phone and Logitech web cam [winged connectors] pics and video.

HC4 connector disconnect shields removed with Harbor Freight rotary tool.

No viz = $22,036 stolen from our Sandia Laboratory Federal Credit Union insured [NCUSIF]
retirement-protected saving accounts unrecoverable.




Wednesday February 4, 2015 14:59

Shunt wires connected to H4C with #10 wire nuts.



Red and black lead to try to measure IR drop for + and return.

Shunt wire lengths may be too short?

MC4 connectors for Grape issues continue.

MC4 connector parts given us by CST Solar did not appear correct.



Two female and one unidentifiable pin, we learned.

DPW Solar visit resulted in



1 Video.

Wire and Cable Stripper Iitem #96158.



High angle of many solar panels observed in New Mexico design goal to get maximum power near winter solstice?

Latitude angle Grape's recommendation.

35.1107° N, 106.6100° W Albuquerque
35.6961° N, 51.4231° E Tehran
42.7000° N, 23.3333° E Sofia
47.6097° N, 122.3331° W Seattle



Two hours work. Done



Large-scale solar wind wind generation of electricity scam/fraud?

Energy returned on energy invested.

80.0 Coal 
5.0 Shale oil
6.8 Photovoltaic
18.0 Wind [maintenance and decommissioning costs considered?]

Small-scale solar generation of electricity evaluation continues.



Tweet.



Monday February 2, 2015 07:02

Only female of six 'mc4' parts in possession appears correct



1 Solar MC-4 Connectors.

2 Samlex mc4.

Notes
Updated
Monday February 2, 2015 10:24

1 75 Amp 600 Volt Stud Blocking Diode. [Only need about 10A?]

Standard to Equalizing charger modification possibility.

2 Free Harbor Freight meter make this project possible.

Meters not all the same.



Spring on meter at right makes contact with microcontroller emp shield.

3 Drok digits changed from 13.0 to 12.9.



USB powers Droke which is connected to 50A shunt.

Video.

4 Battery charging is focus.

Universal charger seen charging BL-44JH nominal 3.8V Li-ion to 4..35.

100% then displayed on TracFone LG L39C Android cell phone.



Universal charger does not always accomplish charge on first try.

5??


Monday February 2, 2015 21:40

Equalize batteries. George Ure
You should not need to worry about equalizing your batteries used in typical RV service. Equalizing is hard on batteries. It is an overcharge to try to get weak cells up to a full charge but that overcharge tends to harm those cells that are already at a full charge. In RV service, the batteries should get an appropriate amount of exercise that minimizes an imbalance in cell charging. This exercise is discharging the batteries down 20% to 50% and then charging with a good converter. A good converter is sized for your batteries so it will get a good current to them and then proceed through the battery charging stages appropriately. It will have the time (8 to 12 hours) to fully charge then entire battery. And then it will go to a maintenance mode to keep the battery fully charged and also do some things to inhibit sulfation.  

Good advice?

Direct amp metering can impose an excessive load depending on the size of the meter’s resistor. A simple 500 amp 50 mv shunt can be had for aboiut $30 bucks.

http://www.wholesalesolar.com/products.folder/meter-folder/Shunts500.html.

George

More good adivice?

The way to solve the problem is by deliberately over-charging a battery. What you want to have happen is the battery driven past its gassing voltage (some people call it boiling, but its not).

This is where bubbles of Brown's gas are given off.

On a 12 volt battery, at room temp, that might involve increasing the charge voltage slowly to the vicinity of 15.5 or 16 volts and holding it there for a couple of hours. This process is called "equalizing" the battery.

It's also somewhat risky if you don't know what you're doing, or if the equipment you're trying to use wasn't specifically designed for this other part (the secret sauce) of battery maintenance.

Done properly, and with a high quality deep cycle battery, you can roll up phenomenal battery results. On our sailboat, I had 9-years on our house bank and it was still delivering more than 85 percent of capacity! Who said marine batteries last only 3-4 years?


Urban Survival Monday February 2, 2015.

The Battery Questions Never Stop

Meanwhile, Batteries (and their management) has a lot in common with picking the ponies. No one seems to agree and this is what makes a horse race.

For example, reader William cites something from my recent discussion on solar power: The part where I said…

The way to solve the problem is by deliberately over-charging a battery. What you want to have happen is the battery driven past its gassing voltage (some people call it boiling, but its not). This is where bubbles of Brown’s gas are given off. On a 12 volt battery, at room temp, that might involve increasing the charge voltage slowly to the vicinity of 15.5 or 16 volts and holding it there for a couple of hours. This process is called “equalizing” the battery. It’s also somewhat risky if you don’t know what you’re doing, or if the equipment you’re trying to use wasn’t specifically designed for this other part (the secret sauce) of battery maintenance. Done properly, and with a high quality deep cycle battery, you can roll up phenomenal battery results. On our sailboat, I had 9-years on our house bank and it was still delivering more than 85 percent of capacity! Who said marine batteries last only 3-4 years?

What Bill sent was this:
You should not need to worry about equalizing your batteries used in typical RV service. Equalizing is hard on batteries. It is an overcharge to try to get weak cells up to a full charge but that overcharge tends to harm those cells that are already at a full charge. In RV service, the batteries should get an appropriate amount of exercise that minimizes an imbalance in cell charging. This exercise is discharging the batteries down 20% to 50% and then charging with a good converter. A good converter is sized for your batteries so it will get a good current to them and then proceed through the battery charging stages appropriately. It will have the time (8 to 12 hours) to fully charge then entire battery. And then it will go to a maintenance mode to keep the battery fully charged and also do some things to inhibit sulfation. Comment please.

Now, you see, Bill, what we have here is one of the problems of the internet: Conflicting information. The reason it may appear to conflict is because the correct answer (depends) is way too long for most people to remain awake.

To repeat, there are two kinds of sulfation that occur in batteries: Sulfation of the normal sort, where the sulfur is deposited on the plates of the battery and is the chemical process by which stored energy (of the reaction) is made available via discharge.

When those micro-crystals are left on the battery plates, they harden into sulfatation…which is much more difficult to drive back into solution.

I’ll skip the part where I explain starting batteries have lots of plate area but don’t do deep cycles well. Might also pass on explaining that deep cycle batteries have lots of plate thickness, but not very many of them. Great for lots of ultimate energy, but sucky when comes to terminal voltage under load – which is what you want when you start an engine because of an electric motor measurement called “locked rotor current.” Yes, glad I’m skipping that part.

Upon normal recharge, almost all of this soft crystalline material is driven back into solution (see your hydrometer readings). Over a number of discharges, however, say 100, there is some sulfur left on the plates and that’s why great battery companies (Trojan, Rolls-Surrette, and others) recommend equalizing because deposition of the sulfur is not uniform due to internal differences in plates and lead paste depth and so forth.

The caveat is that you don’t need to do this often. It is mainly related to the number of times the battery has a discharge of more than say 15-20%.. That’s why here at the ranch on my solar system I rigorously equalize every year….or two. That’s because the number of deep cycles is low. Most of the time the system is handling power bumps and 5-minute outages.

Skipping equalizing altogether, however, is a bad idea, in that over time, all batteries that are cycled lose capacity. If your batteries are simply sitting there, not cycling, then sure…float them at the right temp and call it good.

It’s a good idea to unplug 12-volt appliances, because typical equalizing is constant current charging which typically gets up to the 15.1-15.3 voltage, and may go higher depending on whose equalizing algo is built in to the charger.

RV’ers are big on calling chargers “converters”. Strictly speaking, if it has a big transformer in it, that thingy which converts AC to DC may be properly called a charger. If, on the other hand, in order to save manufacturing cost, if the big, heavy (ergo expensive) magnetics are left out, and the converter uses high-frequency switching, then it’s a converter. Both are designed primarily to step-down 110VAC (or 220VAC) to 12 or 24 volt DC for charging.

And inverter is something that converts the DC back into useful AC to run appliances.

And the inverter/charger uses big magnetics associated with the (usually modified sine wave type inverter) to act as the charger. A pure since-wave (high frequency magnetics) may be properly called an converter/inverter while a system designed to charge from an RV running battery (engine and lights) and shovel some energy into the house bank while motoring down the highway is called (variously) a DC-DC converter, a buck/boost charger, or a DC converter.

That’s depending on who did the manufacturing and marketing, and how many drinks you’ve had around the campfire. Or how much time you have to waste nitting me to death because what are those things in ham radio that we use to power our ham gear? (Correct answer: Power supplies because they are not designed to manage a battery. They are designed to provide similar voltage and current to what a battery delivers. But because they don’t have extreme high current and because they don’t do Acceptance Charging (14-14.3 depending on battery at 70F) they are not a proper “charger.” In anything electronic, a great deal of precision of thought is necessary because there are exceptions to any “rule” in this stuff. If you want an hours-long discussion of battery performance, take an issue like “self-discharge” characteristics and a discussion of how to calculate when to equalize batteries that have been ignored for a long time. Now that gets to be an interesting algorithm to work on.

And then, to make things really interesting, let’s make the battery under discussion an ultra-high energy density silver-zinc and put it in a high temperature setting…


Thursday January 29, 2015 15:12



Power problem overcome video.

Return on shunt must be connected to battery.
mp4 video and jpg made with TracFone LG L39C Android cell phone.

mp4 converted to wmv with Koyote.

Calibrated solar cell and three meters tests

 

1 Meter tests with calibrated solar cell on cloudy day.

2 Second expensive [<$20] meter.

3 30A 10AWG shut wire experiment.
Super-important for higher [>1A] solar power panel and battery apps.

So are these connectors used with 10AWG 30A wire




Shipped from China?





Wednesday January 28, 2015 13:18

115 and 15 W panel angles.





Albuquerque latitude. 35.11o.

Max power at shortest day of year, not most average power, goal speculation continues.

2 Qiangsun charging battery, driving 80W inverter and Killawat, then cfl loads.

3 HQRP 10 AWG 30A shunt wire Ohm measurement looking promising.




Rodney at CST Solar gave us



with management approval.

Visit to carf showed that price about halved so



mc4 connection hardware impressive.



USB powered shunt VA meter next on project TODO list.



HF black 12V, three colored Fry's [Austin] Adreama. ETEKCITY, and





4 HF 61546 cables.

Viz required.



Wednesday January 28, 2015 17:32

Maintenance and decommissioning costs not addressed below.
Some Real-World Solar Economics
Issue 699-A January 28, 2015

Does adding solar power make sense for a lot of Americans? Why, certainly.

Does it add to America's energy independence? Obviously!

Then why are power companies trying to sneak through "connect charges" for people who want to make a bit of their own power? (The word dickweeds comes to mind.) ...

[PNM wants to add $6/mo/kW to compensate for trying to compensate for solar erratic power output.]

And yes, the shunt to measure battery bank current goes to the negative terminal and nothing else is attached to the battery. All negative connections are made to the house side of the shunt, with that meter.

I was shocked how many people couldn't remember that. People wanted to hook charger negatives and all kinds of other stuff on the wrong side of the shunt (which is a very precise small value resistor capable of very high current - like 500 amps). ...

One Danger Ahead: Grid Connect Fees We are seriously considering at some point selling our old airplane.

If we do, we may consider "pure solar" because, frankly, a bunch of weasel dick state lawmakers are dropping bills into legislatures all over the country to charge small solar operators like Ures truly (and you if do go this route) a monthly "connect charge" that will be as much as $20-$50 per month.

In other words, this is a punish the good guys who step up and start really solving America's energy independence needs.

God help us, taxing away competition is more important, but that's how it works.

[Erratic solar and wind output is problem Ure and other must deal with.

Small-scale solar charge/load controller battery system for emergencies our solution.]

So here's what I proposed he look at (with an error on the number of panels - should be 30 of
the 235 watt panels and two FM80 Flexmate charge controllers....

[One Grape 100W cost polycrystalline us about $133 through Amazon.

235 panels obsolete?

180W Canadian now available.]

The way to solve the problem is by deliberately over-charging a battery. What you want to have happen is the battery driven past its gassing voltage (some people call it boiling, but its not).

This is where bubbles of Brown's gas are given off.

On a 12 volt battery, at room temp, that might involve increasing the charge voltage slowly to the vicinity of 15.5 or 16 volts and holding it there for a couple of hours. This process is called "equalizing" the battery.

It's also somewhat risky if you don't know what you're doing, or if the equipment you're trying to use wasn't specifically designed for this other part (the secret sauce) of battery maintenance.

Done properly, and with a high quality deep cycle battery, you can roll up phenomenal battery results. On our sailboat, I had 9-years on our house bank and it was still delivering more than 85 percent of capacity! Who said marine batteries last only 3-4 years?

[ "equalizing" the battery. No try.]

USB-powered Drok vA meter/shunt used.


Wednesday January 28, 2015 07:05

80o? New Mexico solar panels mounted at a wide variety of angles.

Solar output in Albuquerque is roughly 80mV measured by calibrated solar panel.

One Sun is 267mV.

Agressive angle may be attempt to maximize power at the winter solstice [Yalda]?

Tuesday January 27, 2015

80o angle same as 15 W HF panel stand.

Double layer of making tape placed on Grape frame and
Lowe's aluminum angle and flat bar.

Double sided foam sticky taped hold parts while clamps tightened.

 

*Level used to check horizontal bar alignment.

Yard stick used for second side alignment.







Sturdy.

Horizonal bar should have been raised to make clamp tightening easier.

1 Angle setting misadvice.

Monocrystaline 5 adn 15W panels backsides get very hot in sun. Finger-burning hot.

Grape stays cool!

Tuesday January 27, 2015 15:34

Cushioned Grape clamp-mount stand.



Clamp-mount frame rationale video.

Belen NM city hall dead stirlings monument to the liberal arts 'educated' doing altenergy.

15W Harbor Freight frame



adjustable for three angles.

Hole in bottom of frame for sturdy base attachment, if necessary.

HF 5 W panel angle adjust system.


 

Monday January 26, 2015 15:55

GS-Star-100W stand design.



Six clamps, 2 aluminum and stips, Permatex blue and double-side sticky tape construction.

Clamp faces coated with blue for cushioning.

Volts.



Amps seen slightly over 6.



Male and female [plug and receptable, in usb parlance] mc4 received.

1 Video of mount plans.
Photos and video made with TracFone LG L39C Android Jelly Bean cell phone.



 




Saturday January 24, 2015 08:11

Arrived by FedEx


Power input to test charge/load controllers reason for purchase.

3 W and one 15 W Harbor Freight monocrystalline panels limited testing capabilities.

Charge/load controllers planned to power electric skillet for evaluation.

Solar shunt Volt/Amp board.



Operation description.

Construction site.


TracFone LG L39C Android cell phone photo reduced to 800x? pixels.




Saturday January 24, 2015 09:12

Renogy 100W mono was first idea.

Poly experimentation desire prompted Grape purchase.
Hers is the shopping list I would go with for a really simple system:

Renogy 100W Mono Starter Kit: 100W Solar Panel+20' Solar Cable+30A PWM Charge Controller+Z Bracket Mounts This will set you back $185 at Amazon. For another $150, add a second RENOGY 100 Watt 100w Monocrystalline Photovoltaic PV Solar Panel Module 12V Battery Charging as their 30-amp charge controller should handle the power of both cells.

Then you just need a good to great deep cycle battery and an inverter: Power Bright APS1000-12 Pure Sine Power Inverter 1000 Watt continuous / 2000 watt Peak 12 Volt DC To 120 Volt AC which is about $280 bucks.

Inverter School 101

There are two kinds of inverters: The cheapo kind are “modified sine wave” and the way these work, if you look at their output on a scope is it looks like those stepped pyramids in Mexico, rather than a smooth rise. It’s a stair-step kind of thing. The pure sine wave is a better choice if you are planning to use a television, microwave, or radio gear because those “steps” may cause microwaves to hum oddly, televisions to have oddities to their pictures, and ham gear to hear “hash” on low bands.

Urban Survival
January 23, 2015

Off-grid system separate from grid. Reason.

People often times will plug a generator into the closest outlet in their home and if they are lucky, that leg of the 240 VAC power coming in will bring up a TV and the fridge and maybe some lights in the house.

Few bother to think about the downed line. A generator that’s plugged into house wiring will feed power back down the line to where it is broken.

It’s enough to kill an innocent lineman.

NEVER NEVER EVER BACKFEED.

If the power goes out, then what does a grid-tie inverter synch?

Some Albuquerque residents connect a grid-tie inverter to a battery/solar panel system, then plug it into the wall when they are away from home hoping to spin the electric meter backwards, we were told by XXX Solar company employee.

Maybe just a solar panel/inverter with no battery backup pumping erratic power onto the grid?

Home gried-tie systems do this!

Illegal. No grid-tie inverter here.

80 ,200, 400 HF bought out of curosity to see how each performs.

Serious load consideration.

Canadian solar panel purchase investigation audio.


Thursday January 22, 2015 21:02

Meter powered by USB Strongvolt POWERBANK MINI.



Shunt/meter arrived 01/2115 from



1 Shunt/meter.

2 POWERBANK MINI important power up video.

3 V/A meter power on. :)
[o]n four patents on battery state of charge instrumentation (as a team member) and building my own grid-interactive solar power system which co-powers this content sort of qualifies me as an expert. Our mixed solar and wind system on on cruising sailboat we lived on for 10+ years also counts as hard-learned lessons….

In recent week’s I’ve had advertising inquiries from outfits that wanted me to sell ‘em advertising for solar power producta. That got me to thinking: Time to haul out the BS detector and teach you how to read it.

[Liberal arts educated BS]
George Ure
Urban Survival
Thursday January 22, 2015


Shunt/VA meter board layout caused read.



DC 3.6-30V
DC 0-100V
DC 0-.999 mA
50VA

Block diagrams below. 4.5-30V and DC 4-30V. Close.


Friday January 23, 2015 08:15

mc4 specs.

The MC4 connector is UL rated at 20A and 600V maximum, depending on the conductor size used.
[c]onstant spring pressure provides reliable low resistance contacts. However, it is very important to never connect or disconnect them under load, even on low-voltage (12-48V) systems. An electric arc may form which can melt and seriously damage contact materials, resulting in high resistance and subsequent overheating.
Same advice in Harbor Freight 400 W inverter manual.
Tip: Engine start batteries should not be discharged below 90% charged state, and marine deep cycle batteries should not be discharged below 50% charged state. Doing so will shorten the life of the battery based on most battery manufacturers recommendations. ...

We recommend you use deep cycle (marine or RV) batteries which will give you several hundred complete charge/discharge cycles. If you use the normal vehicle starting batteries they will wear out after about a dozen charge/discharge cycles.

Shunt/volt-amp meter arrived from China.

 

Looking at 235 and 280W Canadian solar panels too.

As well as pure since wave inverters.


Wednesday January 14, 2015 10:53

Power on problem videos. And fix?



13.6V panel voltage shows Qiangsun regulates 5W panel voltage down from about 20V to obtain .03A power.

1  Red LED on power on power on failure.

Reversed power and return. No damage. Diode protected.

2 5 W solar panel connected. No battery power.

Button press result.

3 Power on success?

4 Panel connected.

5 + battery and - return IR mV meters connected show battery charge.

6 Qiangsun powered by battery - no solar charge.

Qiangsun power leads are about 3 feet long compared to about 3.5 for the HQRP.

Leads used for shunts to measure IR drop in mV.

7 Dusk. .1 mV, not .01.

8 Shade on dimly powered 5W solar panel Qiangsun response.

9 Mode 0?








Monday January 12, 2015 21:00

Viz is the name of the game.


IR wire shunt drop replace 10A HF meter current measurements.

 

1 Video.

Bad clip apparently caused 15 W solar panel not to measure on the HQRP.



2 video.

Monday January 12, 2015 10:59

30 AWG wire



reported to handle 30 A.

IR drop current measurement to replace 10 A Harbor Freight meter current measurement.

HF free meters will measure IR drop in mV, however.

HQRP wiring upgraded to match Qiangsun on Sunday January 11, 2015.



after failure of test leads at about 1 A. 


Friday January 9, 2015 18:40

XCSOURCE® Intelligent 30A PWM Solar Panel Charge Controller 12V24V Battery Regulator LD296.

Qiangsun?


Leads for Qiangsun 30A charge/load contrioller.

#10 wire 30 A.

But 2.588 mm.

#12 2.053 mm but 20 A.

30A solar panel output?

These panels PUT OUT 100 watts / 6 plus amps as described.

I have them attached to a charge controller with a built in meter and on a sunny day have seen the output from these panels providing 11.3 amps.

I get about 100 watts when sunny.



Wednesday January 7, 2015 14:02

Wire size limitations?





1.6 A important restriction.



Meter, charge controller and wire size video. Logitech webcam video.

50 A Shunt can be used to calculate resistances of the 200 and 400 W cables? :)

Return IR drop measured in addition to the high-side drop.



Video. TracFone Android LG L39C video.

Viz important.








Tuesday January 6, 2015 16:34

Measuring Amps with



problems over 1 A.

So we tried to measure reistances of

1 yellow wire
2 white
3 yellow, white, and HF free meter set to 10A scale and on.

As well as




as well as resistances of 200 and 400 W HF inverter + leads.



R white =  3.3/1000/5.22/200 = .1264
R yellow = 3.7/1000/5.21/200 = .1420
R meter = 36.6/1000/5.19/200 = .1410
R 400 = .2/1000/5.23/200 = .0076
R 200 = .5/1000/5.22/200 = .01916

Video.

Preparation for shunt resistance measurement.



6 Ft. 300 Amp Inverter Cable Set.
Batteries to backup solar panels are expensive ... and wear out.



purchased to measure with different resisitor values.



Bottom are 140 Ohm.

Werker nominal 12V powers Etekcity 1.0/2.1 usb charging ports.



Voltage from Werker and Etekcity monitored for usb output stability at about 5.24 V.

14 Function Professional Digital Multimeter with Sound Level and Luminosity used to measure IR drops.

V for resistor, mV for cable scales.

Top are about 14 and 4 Ohm used to test ubs charging.

R 200 = .3/1000/5.21/100 = .0058
R 400 = .3/1000/5.22/100 = .0057

Two 100 Ohm in parallel to make 50 Ohm

R 400 = 5.6/1000/5.20/50 = .0538 Try this again?

Hmm?

IR drop video using 400 W inverter cable as shunt.

So about 12.24 V on battery.

12.24/.0076 = .0930 Ohms
12.24/.0057 = .07
12.24/.0538 = .6585

Tuesday January 6, 2015 13:20

 



Measuring Resistances Less Than 1 Ohm.
The 5 V power supply needs to stay reasonably steady between readings. Any fluctuations will introduce some inaccuracy.

USB Work?

R2 in ohms = R2 millivolts / 1000 / (R1 volts / R1 resistance)

R2 in ohms = 216.64 mV / 1000 / (4.7696 volts / 218.9 ohms) R2 in ohms = 9.94 ohms

Kirchhoff's circuit laws.

Measuring current shunts.



Friday January 2, 2015 13:02








Amazon shunt

Thursday January 1, 2015 18:58

http://www.sendyne.com/

Draft.

Hello Sendyne,

Current measurement using 10A setting on inexpensive Harbor Freight #98025
may have caused a HRRP solar charge/load controller to apparently
malfunction at about 1 A in dim illumination conditions.

Concern that test leads or meter may be at fault causes to us
investigate a better way to measure current for off-grid solar/battery
power systems.

SFP100 Current Measurement IC prompts me to contact Sendyne before
evalation of Qiangsun 30A solar charge/load controller.

regards,
bill




Subject: RE: Solar/battery current measurement ideas solicited.
Date: Wed, 31 Dec 2014 16:01:02 -0600
From: George Ure gure@centurylink.net
To: 'william payne' bpayne37@comcast.net

Bill

Sorry…I missed the front end of this – could you resend. I am on several patents on SOC instrumentation and design/ built my own 3.5 kw grid-interactive system here at the ranch. 20 panels, paid of 2 kw sine wave inverters, 16 golf cart batteries and 2 MMPT tracking charge controllers…but back to point:

This dim light note is extremely interesting.

The standard way to measure net charge/discharge is with a standard 500 a 50 MV current shunt (series) in the negative leg. In other words, all current to the ground negative of the battery is read on a volt meter and integrated as amps (a shunt is a high precision resistor) and then (with a microprocessor based KWhr meter like the Link 10 or e-Mater predecessor, integrated to yield kilowatt-hours, derive amp-hours and infer battery CEF (charge efficiency factor) and from there, a Peukert calculation of battery dynamics ( implied capacity at different rates of discharge ) becomes possible.

Using this approach it is important that the negative line shunt is the ONLY thing going to the battery (-) – all other connections are on the far side of the shunt. Now we can get some precision rolling. Inexpensive voltmeter may work well with this addition. Then you just need to work out a spreadsheet for the ranges you want. All batteries charged to where the charge current drops to about 1% of battery capacity, so a 100 Ahr battery would be full when at charge voltage (13.8) the current is less than 1 amp and then you can drop to 12.8 (or whatever, this is a temp compensated voltge) to maintain perfect battery availability.

Direct amp metering can impose an excessive load depending on the size of the meter’s resistor. A simple 500 amp 50 mv shunt can be had for aboiut $30 bucks.

http://www.wholesalesolar.com/products.folder/meter-folder/Shunts500.html.

George

www.survival.com and former guru/off-grid/marine power guru in a previous lifetime.
Notes
Updated
Friday January 2, 2015 11:07

1 off-grid/marine power guru in a previous lifetime.

2


Wednesday December 31, 2014 09:21





30A system received 12/30/14.

Introduction video.

History.
Solar charge controller User's Manual - Pro Se Fights www.prosefights.org/hqrp/manual.htm May 8, 2013 - Solar charge controller User's Manual English ... HQRP charge controlling 12V 9Ah Werker AGM battery from 15W Harbor Freight panel videos

Solar 'came alive' after HQRP installation/evaluation. Total BS before.

Qiangsun 30A project start 12/30/14.

Read manual, think, install, test, revise manual in english. Opposed to chinglish. :)

Making a living selling Qiangsun 30A goal, we expect. Let's try to help.

1, the cable: to advise to use the cable with many pcs copper strips, to assure the cable can meet the installation needs. than keep it as short as possible. so that to reduce extra power consumption, the cable should no bigger than 4A, MM2. to strip 5MMI for the controller side.

2, to connect the cable to the control let battery point first. than to connect the cable to the battery. Pay attention to +/- pole, don’t put wrong connection. If it is correct, the LED-2 will be bright, to press the button to check it. Otherwise, to check the cable connection. If it is incorrect, it wont destroy anything.

3, to connect the cable to the controller PV point, than to connect the cable to the PM,, Pay attention to +/— pole, don’t put wrong connection. If there Is sunshine. The LED-1 will be bright, otherwise, to check the cable connection.

4, to connect the load cable to the controlload point. pay attention to +/— pole,don’t put wrong connection, Otherwise. it may burn the load..

5, the cable to the controller side should make it a little curve, so that water won’t come into controller.

[Chinglish? :)]



Tuesday December 30, 2014 17:29


 











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