Question on battery cable size for Phoenix 12/3000 inverter

Question

question

donhrtf asked May 8, '19

Question on battery cable size for Phoenix 12/3000 inverter

Manual says 90mm per + and - connections. There are two connections for each. Does this mean 2 x 90mm for + and 2 x 90mm for - ??

Thanks in advance

inverter current draw

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Modifications Space

Node Red Space

Answer 1 · 2019-05-08T21:32:09Z

boekel answered · May 08, 2019 at 09:32 PM

total 90mm2, so 2x 50mm2 is also good.

2

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

donhrtf commented · May 09, 2019 at 06:14 AM

Thanks much

It seemed like a lot with 2 x 90

0 ·

boekel ♦ donhrtf commented · May 09, 2019 at 07:53 AM

Rule of thumb (very short or long cables excluded)
current / 3 = mm2
so a 3000VA unit at 12 volt can draw about 300A continuous max, / 3 = 100mm2 --> 90mm2 is fine.

that rule of thumb is for preventing too much heat in the cables.

for longer cable runs you calculate with the maximum voltage drop to prevent to much losses.

0 ·

question