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Hello,
I have a Battery Bank of 4 brand new Victron 90Ah AGM Deep Cycle Batteries connected in serial for 48V. They are charged primarily by a Victron MPPT.
I get an error everyday from Venus (BMV702), stating that the Midpoint Deviation exceeds 3.4%.
Is this OK? What is the maximum acceptable midpoint deviation in a 48V Victron AGM Battery Bank?
Thanks,
Markus
Maybe someone can advise here please:
.) Is it a must to use Battery Balancers in a serial AGM Battery Bank?
.) Should I do equalisation charge on new Batteries?
.) what is the maximum acceptable midpoint deviation?
I have double checked:
.) Battery connections
.) Fuses of measurement wires (bad contact) to BMV
My first intention was to wait a few weeks, and so this gets better from alone, but that seems not to be the case.
As I said, the Batteries are brand new.
Thanks for help,
Markus
a 3.4% deviation is .7v or so, but all it's saying is more than 3.4%.. it could be much more. I'd do an equalization charge for sure. I'd also take a multi-meter and log the voltage of each battery. Possibly charging each one separately to get them to a known good state.
I stumbled onto this thread by trying to find what was an acceptable deviation. I just ran an equalization charge with my multiplus and just added my midpoint lead o the BMV. I'm at .2% (13.74 and 13.69) deviation on my 24v bank of 46v golf cart batteries.
Hi neoneddy, thank you for answering. It seems that I was a bit too nervous on this. It now seems to get better from alone. It was never more than 3.5, these days it is at 2 to 2.4.
I will watch this further on and will report :o)
I will also do an equalisation charge, next time I'm on the site.
When do you have the .2 deviation on your golf cart batteries? At floating stage?
Thanks,
Markus
I was just coming down from Equalization then... as of right now it's at .1 13.81 and 13.8
