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I have a Multiplus 12/1600/70-16 and recently I put it on mains charge as weather has not been good enough for solar charge and VRM is showing it pushing up to 16v in to a bank of two AGM batteries. I can't see any reason for this, any help would be appreciated. I don't know if this is temperature compensation error and now batteries have been damaged
Multiplus Config
VRM
What is driving the battery voltage up??
It Looks like the mystery of the over voltage has been resolved. The story so far is the Multiplus kept overvoltage charging, voltage was increasing to 16V+ volts on a 12V system.
The only reference I had was 16.2V is the standard equalisation voltage. Equalisation was disabled so I thought. there was no indication even VRM does not report the Multiplus as being in equalisation mode.
Further research identified there is a feature in the Multiplus, in that if you switch between On and Charge only without going to the off position first, this puts the Multiplus into automatic equalisation or forced absorption irrespective of any other settings- don't really understand this but seems this is the case.
Enter the Digital Multi Control (DMC) - This was fitted to enable switching between modes and adjusting the AC input current Grid/Shore/Generator. The other reason for the DMC was to be able to disable the inverter etc. when not required.
So because of the above feature, it seems i set the Multiplus into automatic equalisation by switching the DMC from ON to Charge Only, the only way to identify is an obscure flashing of a combination of LEDs.
Unfortunately this lesson has come at high price and voltage sensitive equipment
do u have other equipement installed? maybe third party solar converter or something like that.
Batteries are Leoch AGM
