I am trying to design a system with the following characteristics:
- Isolates the house from a noisy, often with excess voltage, grid
- Can use grid on a cloudy day
- Can feed-in to the grid
The gist is to avoid any AC connection from the grid to the house, it would always go via DC.
I see that a phoenix can, with some limitations, share a battery with a multiplus:
https://community.victronenergy.com/questions/123469/multiplus-with-phoenix.html
And that seems to work with a Inverter RS too:
https://community.victronenergy.com/questions/171440/dc-couple-quattro-rs-multi.html
My draft design is:
- Lynx Smart BMS 500 to keep track of the battery charge for the entire system.
- MultiPlus-II to feed the grid and charge battery from the grid
- Inverter RS Smart Solar to power the house and charge battery from PV
- Cerbo GX
The MultiPlus-II would connect to the Cerbo via VE.bus and both the Inverter RS and the Lynx via VE.Can.
Would this work? In particular
- Would the MultiPlus-II feed the grid when the batteries are full?
- Would the MultiPlus-II charge the battery in a cloudy week?
- Would the MPPT be disabled if the battery is full and the grid down?
If this is too much to ask, I can use independent charge controllers, that way the Inverter RS becomes just a DC load on a vanilla ESS, which should show up in the Cerbo, right?
