Off grid project.
What is prefered 48 or 24v? Plan to use 4x FLA 48v 750Ah batterys, 2nd hand FLT 600mm tall type, fit well in brick bunker - won't freeze, cheap too. Had one of these batteries for 2 yrs on 3 solar panel. Just 24v for now, testement Victron MPPT abilty manage battery life still working well, 150/30 MPPT is very robost unit.
So is 48v is better for battery and inverter, but I like 24v for control circuits, have 5m cable run to bunker with 350mm2 is lots.
Shortly add 24 PV panels and 800W wind turbine, just bought 150/60 MPPT for extra PV.
When running Wind turbine on my 150/30 MPPT, it just won't settle!, but with a basic 24v charge controller just works, charge controller will short the turbine when battery is full, I also use step up transformer to boost turbine voltage at low wind speed. Will watch Victron products for wind compliant MPPT.
Do use BVM to switch in 20A water heater above 27.5v. This uses 24v relay.
Current thinking is to add small 24v system 2x12v car battery, charged by wind turbine when 24v is low. Just another relay to switch 3 phase into either 24v or 48v charge controller.
Probably Quatro 8k inverter, no plans to have genny, prefer hydro system. Some concern about limited winter sun, and my 5kW GSHP drain battery, will burn some wood to supplement heating.