Small Off Grid PV Schematic

davemac

The Victron 24/1200 in search mode draws 3 W 

davemac

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 

Photowhit

davemac said:

I've attached a grab of the spec sheet FYI

Self Consumption 450 mA with AC switched on / 25 mA with AC switched off

So .45 Amp X 12 volts = 5.4 watts!

Edit; Sorry Dave, I didn't see there was a 2nd page...my bad!

davemac

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

zoneblue

Im no fan of either those battery swtichs or those thermal breakers. Save yourself some grief and use instead Carling  DC breakers. The cost is very little extra, maybe even less.

davemac

Thanks Zoneblue