Doubling DC wiring - but not all the way

[PaulRainbow]

Thanks for the feedback, of course aware of all said, but below is the issue.
Of course it’s completely impractical to run 140 mm2 cabling, so even the manual states 2 x 70mm2. I can do that, my run is maybe 8m, but I can only get 1 x 70mm2 cable the last 1m or so due to access.
I think I’ll have to live with that.

Appropriately fused and with good, hydraulically crimped terminals this will be fine. It's equally important to make sure all connections are very secure.

 

[VicS]

The OP is fitting a 48v 5000w inverter with a built in 70a charger.

Continuously rated at 5000w, which at 48v will draw about 100a or so, but also rated for probably double that for peak current, hence the 200a fuse. The fat cables aren't there for current ratings, they are there for voltage drop.

For a 48 volt system volts drop is less of an issue. Single runs of 70mm² should be adequate.
.

 

[PaulRainbow]

For a 48 volt system volts drop is less of an issue. Single runs of 70mm² should be adequate.
.

Yet the manufacturer specifies 2x70mm.

 

[VicS]

Yet the manufacturer specifies 2x70mm.

Maybe but without that what conclusion would you come to if you had to calculate what size cable was required, either using simple arithmetic, as I like to, or by using one of the on line calculators.

FWIW the calculator on the 12 Volt Planet website gives the following result