Good Evening,
I'm looking to set up my grid tie system with some battery storage and looking on the best victron device to do it based on my specifics. I think the multiplus would be suitable?
I run an existing 8KW 22V systen based on a 6S li-ion batteries, which runs a UPS and some DC loads.
As I understand, I can use Victron DVCC system to manually change the charge voltage to accommodate for these batteries. The charge voltage should be limited to 24.6V (4.1v/cell) instead of the more usual 28V+.
I would also like the inverter to be able to switch off when battery voltage drops below 19V and only restart once above 21V. I'm unsure whenever the inverter can be programmed as such or if I need external circuitry.
Presently, I have a grid tie setup with a 3.6KVA inverter and a separate charger and UPS. Ideally I would like to use the victron to replace the existing UPS. The goal is to make the battery AC coupled so it's charged on any surplus export with the inverter boosting the AC output in periods of demand / night.
My needs are for the inverter to offer about 1KW of autonomous power as a UPS, but I am unsure about it's behaviour when household mains is available. Will it assist the grid, providing the available grid capacity + the inverter capacity? Or will I still be limited to the rated inverter output, therefore having to choose a 3+KW model? I understand during a grid outage available power = inverter max power. My query is when the grid is available.
I am also not sure on how the victron multiplus works - Can it inject power on the grid to make up for the house usage? Or is it limited to supplying loads on its output, therefore not drawing from the grid?
Thanks!
