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diy solar

Regarding charging lifepo4 batteries, I notice

jurbanik

New Member
Joined
Aug 27, 2024
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3
Location
Pennsylvania
Regarding charging Lifepo4 batteries, I am considering upgrading my current small solar off grid cabin, currently 300v panels charging a few golf cart batteries, to a 24v system that includes approximately 600ah (six Sungold 100ah Lifepo4 batteries, a Sungold Power https://sungoldpower.com/collection...w-dc-24v-pure-sine-wave-inverter-with-charger, and 2 415W Mono Black PERC Solar Panels (https://sungoldpower.com/collection...ar-panel/products/415w-mono-black-solar-panel) and generator charging when the battery bank gets low. However, I noticed the recommended charging amperage is 50 amps on the batteries. Unfortunately, it is unlikely that the panels will ever provide 50 amps and the generator only produces 30 amps. Should I stick to agm, or will the system outlined be able to charge the batteries even though reaching the recomended charging amps is not possible?

 
Keep in mind that if you have 6 batteries the max charging current can be 6 times* the current for 1 battery. Also keep in mind that it is easy to get out of balance with LiFePO4 batteries wired in series.

* current of course is dependent on voltage of connected batteries. 50A at 12vDC is only 25A at 24vDC
 
Last edited:
No trouble with slow. It is too fast that makes problems.
And unlike flooded/AGM there is no particular need to go 100% charge every day with LFP.
I expect the solar production to increase as you give up the long slow absorption phase in the afternoon.
 

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