Hi!
I have a few consumer units - one for the house, a separate feed and board to the garage and an EV charger board - all connected back to the grid feed / smart meter via henley blocks.
In the garage I currently have another 2x EV chargers and my old solar setup. I’ve got a Fogstar 32kWh battery on order and am looking at using a MultiPlus II + Cerbo GX to add home energy storage.
I am planning to add a separate Garage DB and use that to feed the current garage consumer unit and move the solar, EV chargers and connect the new inverter to that.
I’ll charge the battery during the night on my cheap rate electric and discharge it during the day to save on electric. Anything from the solar will offset the usage, or if there is excess, export back to the grid (my export rate is higher than my night time import rate). I believe I can discharge the battery through the AC IN on the MultiPlus II and I’ll have some critical loads (network/servers) on the always on AC out.
I don’t want to discharge the battery for any of the EV chargers, so ideally the Victron would be unaware of those and they pull pull straight from the grid.
Can I put an energy monitor (I have got some ET112s) on the supply to the house consumer unit and another on the garage consumer unit and only discharge what they are drawing (+ the critical loads connected to the AC OUT)? - i.e sum together two grid meters, plus the AC out load?
What about the grid tied solar? - how can i have that negated from the discharge requirement (or not discharge if there is excess)?
(would I be better connecting the grid tied solar to the non-critical AC out so the multiplus can see it’s export?)
Thanks!
Ian