I have an outbuilding at the end of my garden that has solar panels on the roof, and feeds power to a server and 3d printer. Im trying to run this as "off grid" as possible, but if there is not enough solar and batteries drop to empty, then the multiplus to charge them up and do the switch over so i never loose AC to the server / printer.
I currently have the multiplus, and an Epever MPPT Solar Charger
I will have:
1 x 150/45 MPPT Solar Charger
1 x MultiPlus 24/800/16-16 230V
1 x 484ah AGM Battery Array
1 x Pi running Venus OS
1 x SmartyShunt (if required)
2 x VE.Direct Cables (MPPT / shunt)
1 x VE.BUS cable - Multiplus
Question1:
Do i need a smartshunt to measure the Solar charge current even though i will have the MPPT linked to venus os with VE.Direct??
Can the VenusOS not use the data from the MPPT for this already and then have a summed SOC from both MPPT and MULTIPLUS??
I also have a small amount of DC usage from the batteries <10w @ 24v - can i use the same smart shunt for that as the charge side of MPPT, or do i need a 2nd smart shunt?
Question 2:
I want to prioritise the SOLAR to charge the battery array and use as much of that as possible with the MULTIPLUS inverter, only using the MULTIPLUS charger when absolutely necessary, and it sitting in inverter mode the rest of the time.
I do not want the MULTIPLUS to feed back to grid EVER
Whats the best way to do this... ESS? IgnoreAC?
Thanks All
tim :)