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Expand Victron Smart 12.8/200Ah LiFeP04 House Bank

Our flooded lead acid house bank is at end-of-life. I would like to start a new 12V bank with 1 or 2 new Victron Smart 12.8/200Ah model BAT512120610, then expand it up to 6 over the course of six months to a year (for a total of 1200Ah) if this is possible.

At the time of capacity expansion, if:
1) all existing batteries are wired in the Posts style (see diagram below); AND
2) the existing bank is fully charged; AND
3) the new battery is also fully charged (via separate IP65); AND
4) voltage is identical on the existing bank and the new battery prior to connection,

is there any reason why this plan would not work?


I understand that the ideal is to have ALL the batteries exactly the same age and SOC from the very beginning, but this isn't always the case.

15200-screenshot-20201206-101210-drive.jpg

Lithium BatteryPeak Power Pack
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Perfect moment to switch to a 48V system.

I was contemplating a move to 24V once all six were in place. I haven't really thought much about 48V...

I would also consider another compatible battery type.
https://www.victronenergy.com/live/battery_compatibility:start
(most of them have a way better price/kWh)

Some of them like Pylontech are also available with small capacities and are easy to expand in small steps.

sv-drumbeat avatar image sv-drumbeat Matthias Lange - DE ♦ ·

Hi @Matthias Lange - DE, Thanks! I will definitely have a look at the other brands/technologies. From your experience though, is what I'm proposing technically feasible (although more expensive)?

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