Turnigy Max80W small problem

[mrzed72]

Dear Pawel!

Very good job, thank you. There is only a small problem: Only I can spend ~45W, ~80W does not work. If it is not too much work, please look for the cause of the problem. Sorry bad english, i am use google translate.

Thank you Zoltan.

[stawel]

Only I can spend ~45W, ~80W does not work.

1. are you using: cheali-charger-Turnigy-MAX80W-7A_2.00-e10.3.12-20160613_atmega32.hex (or .bin) ?
2. what is the output current Ic?
3. what is the output voltage Vout? (charging voltage)
4. what is the balance port voltage? (if used)
5. what program are You using: charge, discharge, balance+charge,...?
6. which battery type?

[mrzed72]

1. I flash cheali-charger-Turnigy-MAX80W-7A_2.00-e10.3.12-20160613_atmega32.hex
2. Set 5000mAh to 8A 6S lipo battery. 2 to 1.8mAh charging steady decline
3. 22,2 to 25.2 V
4. 3.7 to 4.2
5. charge or balance + charge
6. 8000 mah 6S Li-Po

It recharges the battery properly, but the power does not exceed 45W was never. If settings menu max IC > 5000mAh then "calib. error I charge 14".

[stawel]

I've uploaded a new version for you: cheali-charger-Turnigy-MAX80W-7A_2.00-e10.3.12-20161122_atmega32.hex

please check if it work now.

[mrzed72]

I flash cheali-charger-Turnigy-MAX80W-7A_2.00-e10.3.12-20161122_atmega32.hex I calibrated and tested. Unfortunately, still it does not work correctly: https://youtu.be/F0iMhJBNp-Y

[stawel]

Thanks for the video! could you do another one, but this time run the "charge" program, I also need to see the cells voltage during charge (press the "up" button several times while charging).

[mrzed72]

Ready: https://youtu.be/NIjHtJ9f-qk Input voltage not valid, i use pc power supply max 12V output.

[stawel]

hm... interesting, I have no idea what's going on :/, i need to think it through, could you also download your eeprom from your charger and send it to me?

[mrzed72]

did you think of this? https://drive.google.com/file/d/0B-1Wi6VTV4CvclFoRUdwdnhIMjg/view

[stawel]

did you think of this?

Yes, thank you very much, based on you eeprom I can say that your "settings"->"max Ic" should be ~ 6700mA but I still don't know why you can't charge with power > 45W :/ I will look into it after this weekend - unfortunately I'm busy until then.

if you have a battery with less cells (<6cells) could you check if you can charge it with >45W?

[stawel]

Input voltage not valid, i use pc power supply max 12V output.

why is this voltage not valid? could you calibrate "Vin" and check what the voltage is during charge?

[njozsef]

Szia Zoli.

Ha az a problémád, hogy nem tudod a max áramot kihasználni, az azért van, mert az áramot mérő sönt túl nagy a töltőben (az eredeti szoftver is rossz volt szerintem).

Szóval le kellene ezt a mérőellenállást csökkenteni és utána az áramot megpróbálni újrakalibrálni. A hibát az okozza, hogy a vezérlés növekedésekor túlcsordul az az aránypár ami a töltőáram/mérési adat-ot reprezentálja.

Sorry guys.

This is a hardvare problem, need change smallest current measure resistor. best regrds nj

2016-11-23 10:20 GMT+01:00 mrzed72 [email protected]:

I flash cheali-charger-Turnigy-MAX80W-7A_2.00-e10.3.12-20161122_ atmega32.hex I calibrated and tested. Unfortunately, still it does not work correctly: https://youtu.be/F0iMhJBNp-Y

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[mrzed72]

stawel: I'm sorry. I did not know. Not available in the original firmware?

[stawel]

@mrzed72 could you test the new firmware cheali-charger-Turnigy-MAX80W-7A_2.00-e10.3.12-20161202?

as @njozsef said, the "settings"->"max Ic" issue is a matter of your current measuring resistor, you need to set "max Ic" to something less than 6700mA or replace the resistor.

[mrzed72]

I flash and calibrating... tested... It became a little better: https://youtu.be/gEwd3lx99sc The same more 3S in parallel with batteries.

[stawel]

It became a little better:

I'm suspecting that your issue has something to do with this setting: https://github.com/stawel/cheali-charger/blob/master/src/hardware/atmega32/targets/Turnigy-MAX80W-7A/HardwareConfig.h#L45

This value sets a PWM duty limit on the boots converter, 1.56 means a 56% duty limit. (see: https://en.wikipedia.org/wiki/Boost_converter#Continuous_mode) If you what you can try to increase it to 1.60 and compile the code.

The same more 3S in parallel with batteries.

I'm not sure if I understand you... what is the power output when you connect a 3 cell battery?