Sgt Raven
Solar Addict
- Joined
- Feb 17, 2020
- Messages
- 1,079
This may be due to the accuracy range of the meters. Of my 3 DMMs. 1. is DCV 0.5%, 2. is DCV 0.05%, and 3 is DCV 0.005%Update! Relay attempt and another capacity test.
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Wanted to get a better feel for ideal upper & lower voltage settings.
1st Pic - The voltage started quickly dropping once I turned the inverter on
2nd Pic - Met the 80% Wh (5,758Wh @ 221Ah @ 25.51V), cells staying somewhat balanced
3rd Pic - 24.2V inverter low-voltage alarm beeps on & off, cells less balanced
4th Pic - Inverter shut itself off at 24V, continuous beep for 30 seconds (I set it to 30 sec) then it shut off, a quick drop from 24.2V in 4 minutes
5th Pic - I let the battery set a couple hours, shows cell recover voltage, still a little out of balance
What's interesting is the 3 meters all show slightly different voltages amongst each other.
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I'm also curious to do a test to see where the quick voltage drop-offs are and set the upper & lower voltage limits to the edges of these drop-offs to see how it compares.
Started my test 04/07 11:45pm.....
Mine is a 4S 12V battery and I'm doing a low amp test...
I'm pulling 4.1A-5.2A for the fridge and .1A-.9A charging a phone, tablet, and power bank.
I started at 13.9V and it quickly dropped to 13.5V....
24 hrs later and it was at 13.4V.
another 24 hrs and it was 13.3V..
04/13 5:10pm 11.9V
Just checked and the fridge is showing and E1 error code, which is compressor tried to start and low voltage.
6.5hrs short of a full 7 days of a low amperage test...
Time to charge her back up....