Small Off Grid PV Schematic

zoneblue said:

Is that 0.5W idle or sleep? I thought they were higher.

W=VxA 12Vx.45 = 5.4 W (AC switched On) 12Vx.025 = .3 W (AC switched off) for Suresine 300 

I have updated my off grid solar PV plan and included a 3 wire diagram/schematic.

Changes include;

1) Including a shunt that connects to a Victron battery monitor on the -ve side of bat bank
2) using the shunt (-ve busbar side) as a system ground point rather than adding complexity with a ground busbar
3) adding a 4th 250 W panel and going from a 3 panel in series 750w PV power to 2 strings @ 500 w per string (I couldn't go a 1 string 1000 W setup as the Voc max is a few volts over the 150 V recommendation from Morningstar (MPPT 150 V, 60A)
4) relocating the PV disconnect from between array & combiner box to between combiner to GFPD
5) stepping up DC wire size to 6 AWG for system and 1 AWG for bat bank.
6) adding a second surge arrest between combiner & GFPD/charge controller
7) added a dedicated battery disconnect switch now allowing for all combination of power/inverter & charge controller isolation (I think?)
8) adding a 2 fuse block on the bat +ve term, one for system (150A) and one for generator (60A)

If this is something anyone would like to run a ruler over I would be most appreciative to hear some thoughts, warnings, improvements.

Cheers

Dave Mac

Thanks Zoneblue