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philemon asked

Low charging rate with mppt on lithium-ion batterie

Hello,

Hère is my setup :


Smart Solar mppt 100 20

300w pannel

128 ah 12v li ion batterie


I did plug everything in ordre but the Charging keep staying low, like 4w in full Sun. Thé yellow absord led IS on.


Andy thoughts ?



save-20210427-145231.jpg


battery charging
save-20210427-145231.jpg (148.2 KiB)
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seb71 avatar image seb71 commented ·

Post a screenshot with the battery settings from the solar charger.

What kind of Li-Ion? LiFePO4 or something else?

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philemon avatar image philemon seb71 commented ·

save-20210429-155414.jpgyes sir. It IS a 12v li ion battery i think its 18650 cells inside.



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philemon avatar image philemon philemon commented ·

With bms of course

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wkirby avatar image wkirby ♦♦ philemon commented ·

The Absorption and Float Voltages seem very low.
Please check with your battery documentation to be sure these are correct.
You have low production because these target Voltages have been met, it seems.

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