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cetremper asked

MultiPlus II Shuts Down and reboots

Having an issue where the charge controller tops off the batteries and does not go to absorption mode, it keeps charging until it hits 16.1 volts and causes the MultiPlus II 12/3000/120 to shut down. This is a new charge controller, the first one was a SmartSolar Charge Controller MPPT 100/30 and it did the same thing. The parameters for the charge controller are set for lithium phosphate batteries with changes to the charge 14.6 volts and the float to 13.8 volts.

smart solar charging behaviour
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Matthias Lange - DE answered ·

What batteries do you have? Is it the first time charging the batteries to 100%? Maybe the BMS of the batteries is stopping the charging which can cause a voltage spike. Try to reduce the charing voltage and current to give the BMS more time to balance the cells slowly.

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cetremper answered ·

2-Zooms 200 AH, 1-Zooms 100 AH and 1-SOK 100 AH. All connected in Parrell.

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nickdb avatar image nickdb ♦♦ commented ·
Why would you connect different types and sizes of batteries in parallel behind one system? No wonder you’re having issues.
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