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35mm or 50mm cable?
#11
for that Victron inverter, the manual says 70mm2 for 0-5m cable run, see manual page 9
It's so it performs under surge overloads, etc.

re the pre-charge, I've got 2x 10W 4.7 ohms resistors in parallel - via a 10A DC breaker they feed:
1x Victron Multiplus 1 48V/5000kVA inverter (like yours)
3x Victron 150/60 MPPT charge controllers
I have other in-rush devices for the electronics (each 48V connected device has one):
eg Batrium, 48 to 12V 300W PSU, 48 to 20 V 50W PSU (for laptop)
https://au.element14.com/epcos/b57237s02...5-00001622
Running off solar, DIY & electronics fan :-)
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#12
if you ask you most likely have the money and then you really dont have to ask. Go for 50mm2 and you save energy long term and sleep better Big Grin
The Ultimate DIY Solar and build place
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Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
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#13
Hmm.. the manual does recommend 70mm. Thanks for pointing that out.
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#14
A 5kW unit can pull 8-10Kw and thats what you should design for.
Same goes to fusing. Follow recommended. And THEN you build the battery pack to support that current needed in max conditions.
Ibiza likes this post
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
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#15
If the 50 sq mm lugs are very expensive, You could always go for 2 times 35 sq. 35 sq mm lugs are reasonable, and so is 35 sq wire.

ChrisD
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#16
FYI

Simple ampacity app

http://www.gtsparkplugs.com/WireSizeCalc.html

Jim
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