Issue
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For
...
whatever
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reason
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it
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didn't
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seem
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to
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want
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to
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charge
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via
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solar.
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The
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two
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batteries
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were
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in
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parallel,
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and
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it
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was
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either
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always
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in
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a
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standby
...
or in a discharged state while the other battery was charging. After two days at the Earth ship, it would be down to 0% while the other one would be hovering around 32 and, in my opinion, was handling all of the load that we were using.
I even switched things around in terms of positive and negative from the solar controller as well as to the inverter. Seemed to always turn out the same. Upgraded from a 30 amp to a 60 amp, solar controller and… Same issue.
I have three 200 W solar panels. They seem to bring in a lot of amps to the solar controller but… The lithium battery just didn't seem to like it. The lead acid, however, always charged it up. And… Yes, I made sure the solar controller was configured for lithium.
Thoughts:
Everything points to one pack’s charge path disabled by its BMS (temp/ sensor/ protection), not a controller or wiring problem.
Settings
Notes
- Notice that the switch setting is ON. Could there be a thermal switch in play here?
- Discharge Overcurrent set to 10s at 220A. Could lower to 5s.
| Parameter | Original | New Value |
|---|---|---|
| Total Cycle Capacity | 224000 | 280000 |
| Cell Minimal Voltage | 2800 | 2500 |
Teardown Process
Picture showing thermal switch and low temp sensor in newer version:
Capacity Test
Discharged at 10A. Pulled 293 Ah over 29 hours.
References
| Reference | URL |
|---|---|
Name Brand Batteries Worth The Extra $$$? $479 300Ah Vatrer VS $420 280Ah Ecoworthy!
| https://www.youtube.com/watch?v=MDjB7NAxGZM |
| $423 Ecoworthy 280Ah VS $529 Wattcycle 280Ah and Over Current Discussion! | https://www.youtube.com/watch?v=pZm4fa_GjCM |
| 12V 280Ah LiFePO4 Lithium Battery Disassembly | https://www.youtube.com/watch?v=ocCBOAJBX6c |
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