I’ve looked but can’t find this answered anywhere.
I have a Smartsolar MPPT 250/100, hooked up to a 48v array of BAE Secura 6 OPzS cells.
I want to ensure I’m setting the charge voltages appropriately.
Looking at this - https://www.baebatteriesusa.com/wp-content/uploads/2019/03/BAE-VLA-Installation-and-Operation-Instructions-0219.pdf - it appears float is 2.23VPC, equalise is 2.4VPC, and absorption I’ve taken as 2.33VPC.
These voltages are more or less identical to those that victron list for their own OPzS cells - https://www.victronenergy.pt/upload/documents/Manual-Stationary-batteries-EN.pdf.
So... why do all of the OPzS charge algorithms in the firmware seem to be a mile off these values?
The most conservative setting recommended for OPzS (Position 1) gives 2.3VPC for float, 2.68 for equalise, 2.38 for absorption. +0.07, +0.28, +0.05, respectively. It also limits equalise to 8% of charge current, although at 900Ah I should be able to do the full 100A until 2.4VPC at which point it drops to 45A (5A per 100Ah), so surely a setting of 45% would be safe?
Can anyone shed any light on why, and what I should do? I’m using the values from the data sheet currently, and doing the commissioning equalise at 2.4VPC - but the MPPT is limiting the charge current to 5A, when it could be delivering much more - there’s a 4kW array in direct sunlight right now.
Thanks!
