Current AGM ESS system based in the south of France:
- MultiPlus-II 48/5000/70-48
- BlueSolar Charger MPPT 150/70 (VE.Direct)
- Color Control GX
- 4x 12v AGM batteries totalling 200Ah with Victron battery balancers between
This is how it has all been wired up:
The original idea was always to have more storage, possibly with a secondary bank in parallel. However, the idea is now to change to Lithium batteries, so a smarter move is probably to replace the 200Ah AGM bank with a 330Ah Lithium bank.
Proposed purchase list:
- 4x Victron 330Ah Lithium Battery Smart 12,8V
- 1x Victron VE.Bus BMS
- 1x Victron BMV-712 Smart
- 500A/50mV shunt (comes with the BMV-712)
Is this correct and sufficient? Do I actually need all of that? The ESS manual actually states:
In most situations, it is not necessary to install a battery monitor:
Lithium batteries with canbus connection (BYD B-Box, Pylon, LG Resu and others) already have a built-in battery monitor. Adding another will only set up a conflict. Always use the canbus connection to provide battery status/state-of-charge data for these batteries.
That seems to indicate that I wouldn't need the BMV-712 and shunt? On the other hand, in all the example schematics (this one for example: https://www.victronenergy.com/upload/documents/VE-Bus-BMS-example-with-3KW-12V-MultiPlus-230-Volt.pdf) there is a BMV present. So what gives?
And also, looking at that schematic, there is also a BatteryProtect device. Is this something that is needed?
I've been reading a lot of manuals and documents and answers on questions here, and it's confusing to see that some of these don't agree with each other. Or some leave parts out that others include, and so on.
So, any comments and corrections on the proposed upgrade is welcome...
