i am soon to measure some indvidual voltages as requested by another poster, but prior to using any of these batteries, they were all charged using a victron ip65 and all of them fully charged and held their voltages over time periods much longer than the drops I am experiencing now.This is true given a sufficiently long absorption time or sufficiently slow (low C rate) charge cycle.
With this in mind and moving to other areas, i am wondering about what the actual charge profile is set to? I am not familiar with the Magnum 2812 (nor any Magnum inverter charger).
It would be very interesting to see the individual battery voltages with no loads or other connections to verify the. I understand it would be perhaps too much effort to confirm this curiosity. Is it possible to disconnect the battery (lower right switch in latest pic) and measure the voltage after an hour when you see the reading "below 13 volts"?
And...
A quick search reveals a thread that talks about 2 programable profiles (silent and float).
Silent charge or float?
I have a Magnum MS1212 2000w / 100A 12v inverter-charger in my motorhome. By batteries are a couple of drop-in 460Ah packs for a total capacity of 920Ah I am trying to decide which charge profile to use with I am plugged into a full hookup site. I have two programable profiles that should...diysolarforum.com
Can you confirm your charge profile and settings?
Sorry i have so many questions. Just trying to follow clues and what i recall about dealing with other/similar issues.
i can confirm without question, both the validity of the settings and having tried a number of different ones....as well as a lithium ion preset in the magnum unit....thousands of which, I might add, are in successful service today and for many years.
no problem on questions..sooner or later something is going to occur to someone that helps find this....but I can say without hesitation, that no settings or equipment directly involved....inverter/charger, etc.....is presently implicated in this.
it is too odd..the whole thing but we are being thorough in testing everything. I have a full set of replacement wires, too, and if all else fails, will replace every wire in use to see if somehow, despite the maker of the wires and that they all look fine, there may be something going on there.
I am hoping to have the busbars installed within a few days....don't expect it to change anything but it will make moving around with the array, easier, anyway....and they are known bars....from victron, with plenty of amperage capacity.
i will certainly post all results here.