# question

## Dimensioning of inverter cables - is this really correct 4 cables???

It was brought to my attention by our technical drawing department, that there should be 2 x positive and 2 x negative cable for the battery. The cross section of the cables seems quite big, but due to the voltage drop I understand, but 4 cables?? is this really what Victron recommends?? Can´t see how we are going to fit 4, 70mm2 cable in

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You did not mention which model of inverter / charger you are planning to install and also the length of the cable run.
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Lets say 5000 multiplus II 0 - 5 m cables We use Scankab 50mm2 xtreme with amp rating of 242

Seems excessive with 4 cables for 83 amps ( 4000w )

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The manual says recommended and max capability of the product. You're free to make your own calculations. Guessing from what you give use, you have a 48V system. The manual table says 200A and upwards on a short run using 70mm cabling.

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So a 5KVA MultiPlusII with continuous output of 4KW = 83A - agreed. Add losses +4% = 86A.
Let's make it 100A. So if you have selected a nice cable of 50mm² which is rated at 242A continuous? Then that will be perfectly adequate for your needs and you need 1x cable for each positive and negative.

The table in the manual is for general guidance based on a general cable. Nicer cables with better thermal performance of insulation can carry higher current than the table suggests and so then you need to do your own calculations - like you have done.

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