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Mark Harrison avatar image
Mark Harrison asked

MultiPlus-II 2x 120V High DC Voltage/Current Spike Daily at Approx Same Time?

System has been running a few months and everyday around 10am there is a DC high voltage alarm with a spike in current up to about 4A. Graphs from the last week shown below. This happens in charger only mode and Charger/Inverter mode. 1701294879210.png

overvoltage
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pwfarnell avatar image
pwfarnell answered ·

Do you have any other charging devices such as solar power that could be going to absorption voltage. The batteries appear to be full and on float from the inverter. The sun coming up wakes a solar controller and starts a new cycle of bulk/absorption/float every morning.

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Mark Harrison avatar image Mark Harrison commented ·
Yes, that is what was happening. I lowered the absorption voltage on the MPPTs to keep them from spiking the voltage, which seemed to work. I need to figure out how to get the MPPTs to follow the Multiplus. Thanks for the help.
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