I have a 12kw 3ph Sunsynk inverter and 3 Hubble AM-5's,18x 545 panels, all 70mm DC battery cable and 16mm power cable - system runs great. I am thinking of adding another battery. I have not used a busbar box. Will probably be better. I would like a box with busbars fitted. I do like and prefer good quality. Any suggestions on a box, a supplier and I would love some pics of yours please.

Thanks

1 hour ago, Weimaraner said:

I have a 12kw 3ph Sunsynk inverter and 3 Hubble AM-5's,18x 545 panels, all 70mm DC battery cable and 16mm power cable - system runs great. I am thinking of adding another battery. I have not used a busbar box. Will probably be better. I would like a box with busbars fitted. I do like and prefer good quality. Any suggestions on a box, a supplier and I would love some pics of yours please.

Thanks

I have this https://easypowershop.co.za/products/allbro-2x10-hole-battery-busbar-box-m8-600a

Edited April 25Apr 25 by Stefan Cornelissen

I have two busbar boxes, one for + and one for -

I have 2 10.65kWh LiFePO4 batteries, both connected to the "+" and "-" busbars in the two boxes.

I'm not sure if individual boxes are legally required, but I do think that it's safer like this - having seen how far a DC arc can span, and maintain the arc... Would prefer to not have a +400A welding process start between the two busbars.

10 hours ago, HennieL said:

I'm not sure if individual boxes are legally required, but I do think that it's safer like this - having seen how far a DC arc can span, and maintain the arc... Would prefer to not have a +400A welding process start between the two busbars

Individual enclosures for dc busbars are not legally required. Even a very small gap is sufficient to stop quite a bit of voltage. IPC-2221B would specify 0.6mm for 48V for an exposed gap on a PCB.

Breakdown voltage of an air gap is much higher than that 48V will hardly start an arc over any non-microscopic gap.

High DC voltages are a different story. A single enclosure for 48v dc battery systems would be in order. See airgap on Sunsynk inverter battery terminals.

Have a look at Voltex they have various busbar in enclosures available but be prepared they are expensive. If possible make your own busbar box.

Edited April 26Apr 26 by TaliaB

11 hours ago, HennieL said:

I have two busbar boxes, one for + and one for -

I have 2 10.65kWh LiFePO4 batteries, both connected to the "+" and "-" busbars in the two boxes.

I'm not sure if individual boxes are legally required, but I do think that it's safer like this - having seen how far a DC arc can span, and maintain the arc... Would prefer to not have a +400A welding process start between the two busbars.

There is no cause for concern at 48V when it comes to arc over an air gap. Zero actually.

3 hours ago, TaliaB said:

Individual enclosures for dc busbars are not legally required. Even a very small gap is sufficient to stop quite a bit of voltage. IPC-2221B would specify 0.6mm for 48V for an exposed gap on a PCB.

Breakdown voltage of an air gap is much higher than that 48V will hardly start an arc over any non-microscopic gap.

I stand corrected... Still, this is what my installer recommended, and I'm quite happy to have spent a little extra on this.

1 hour ago, HennieL said:

I stand corrected... Still, this is what my installer recommended, and I'm quite happy to have spent a little extra on this.

It's very useful for avoiding shorting them out by mistakenly dropping a conductive item on them. So still would have had them installed as he recommended.

Just to add some info on the great replies around busbars. ACDC stock a great range of insulators to mount the copper busbars.