Hi!
My backup battery solution from Bluetti broke, and I’m considering replacing it with a Victron system instead. I need help in understanding what components are required for a complete system.
I want a cerbo for control - I’m planning to make some more advanced controls via Home Assistant.
The house is on-grid, and located in Sweden. It has a 24 panel micro inverter system already, and the (6-panel) Victron system is meant to be used as a backup system. My plan is the following:
I have two strings of three panels each for the backup system. Total Voc of the strings are 115V, and Isc is 14A. So I guess two SmartSolar MPPT 150/35 should be used. Max power of the strings are 1275W.
The loads I plan to connect to the system are fairly small - a MultiPlus-II 48/3000/35-32 should be enough.
For batteries I think I should go with 10kWh to have plenty of backup time.
The plan is to keep the batteries charged all the time (only from solar though). Maybe use some of the battery energy to shave off power peaks to reduce tariffs (controlled via Home Assistant). Excess solar energy should be exported to the grid.
What battery should I go for?
What parts am I missing - what is required more than the Cerbo + 2xMPPT + MultiPlus II?
Is a BMS required?
Note: I will let an electrician make the installation - I just want to fully understand what is needed.