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My Bluesolar MPPT 100/50 occasionaly gives:
Error code: #18 - Charger over-current
How come? The sole purpose of the MPPT is to limit the current. (and voltage)
I have a 12V 560Ah LiFePO4, and 3pcs 395Wp solar panels in parallel (JA Solar JAM54S31-395).
Maybe related to your other post. The fix for this one is to reduce load or increase cooling.
The error is unrelated to my other error VEbus14. There was a week in between. I have a 560Ah battery, the discharce never exceeds 0,5C, so the MPPT should have no fear about the amount of battery load. During the 5 occurences of overcurrent errors, there was no significant load: the BMV reported 50A going ínto the battery. (So that's the entire MPPT charge current) At that specific moment, the battery voltage was 13.5V so nearly fully charged.
I would expect the MPPT to b e equipped with a current mode controlled buck-coverter. So output overcurrent could never occur.
The issue then maybe that the mppt was producing alot of power, then suddenly the load was gone, so there was a current overshoot. It is explained in the link above.
This can happen when either a large load suddenly switches off or the battery bms disconnects its charge circuit suddenly or a combination of both.
