The Absorption timer for Lead Acid battery types is set at the beginning of every day. However this doesn't work well for NI-FE (nickel iron) as the voltage will rise once a load is disconnected. The batteries can be 100% depleted (down to 9.5V), the load will then disconnect and the voltage will rise to as much as 13V. If the Absorption timer was to be set at that point in time any charge controller will act as if the batteries are basically fully charged.
What I need is for the charge controller to keep track of the lowest observed voltage over the entire discharge cycle then use that value to set the Absorption timer. I'm guessing nothing like this exists right now, but that would be nice thing to have in the future.
For now however, can I do this via a raspberry pi through either ve.bus or ve.direct? If i were to manually set the Absorption timer Automatically myself, I assume I can use something like Linux VictronConnect to issue commands every morning from my raspberry pi?
A complication is I need 2 MPPT charge controllers in parallel so I would need to issue the commands to both controllers around the same time, and I would assume via ve.bus? Or would I have 2 ve.direct devices?
Obviously there are a lot of moving parts here, and I have a lot more research to do, but is what I'm proposing here even possible or can anyone here offer reasons why this is not such a good idea. :)
Thanks in advance.