Please check my diagram - 4S 12V + MPP All In One in a rolling toolbox

[MikeL219]

Whipped up the diagram in Google Sheets. I'm just looking for any critiques or callouts in my modest 12V build. I built Will's milk crate build previously and wanted to make something a bit 'nicer'. I'm eager to read any feedback.

Highlights are:

• 280Ah cells
• Overkill 120A BMS
• MPP Solar 1012LV-MS inverter (1000W)
• 4 AWG wire between the battery-BMS-shunt/breaker and the inverter
  • I used 2 AWG in a previous build with the same MPP inverter but 4 is supposed to be good to 100A, I believe? Please correct me if I'm wrong
• 30A Powerpoles (12 AWG)

One thing I think I might be missing is an inline fuse on the solar input going into the inverter.

Other than that, I'm feeling pretty confident about this build!

 

[BentleyJ]

Wire gauge vs. Ampacity is somewhat dependent on the type of copper strands and the insulation heat resistance. For best results to handle 100A, I would up size the wire to #3 or preferably use Class K or M welding cable. Its more flexible and easier to work with due to the fine strands. Keep in mind Welding and DLO type cables of a given gauge often require a special compression lug with a slightly larger ID barrel due to the finer stranded wire expanding more when stripped back therefore is difficult to insert into a standard compression lug without some of the strands peeling back and sticking out.

 

[MikeL219]

Wire gauge vs. Ampacity is somewhat dependent on the type of copper strands and the insulation heat resistance. For best results to handle 100A, I would up size the wire to #3 or preferably use Class K or M welding cable. Its more flexible and easier to work with due to the fine strands. Keep in mind Welding and DLO type cables of a given gauge often require a special compression lug with a slightly larger ID barrel due to the finer stranded wire expanding more when stripped back therefore is difficult to insert into a standard compression lug without some of the strands peeling back and sticking out.

I should have mentioned this. I used the cable in this Windy Nation kit. I'm not sure if it's welding cable but I think it is. Thanks for the info. I will consider upsizing.