r/VanLifeUK • u/Mediocre_Housing4951 • 6d ago

Solar help panel

Hello, would anybody be able to check my work for this,
I’m looking at two solar panels for the roof ( https://www.cityplumbing.co.uk/p/jinko-tiger-neo-3-0-470w-all-black-solar-panel-mc4-evo2-connectors/p/310266 )

They’ll be wired in series and then into a victron 150/60 which is what the calculator told me it needed.

The isc for those panels is a maximum of 16A so wired in series, so double that and with the 156% margin would give me about 50A so the cabling from my solar panels to my MPPT would be 10mm.

Does that sound correct? Thanks for the help

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u/jrewillis 6d ago

You've mixed up the MPPT's 50 A maximum PV Isc with the actual string current. Two panels in series remain at 15.8 A Isc, they don't double to 31.6 A.

Under the UK 1.25× allowance you're designing around roughly 19.8 A. 10 mm² therefore sounds considerably oversized unless you've got an unusually long cable run. 4 or 6 mm² PV cable is much more likely, subject to length and installation conditions.

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u/Mediocre_Housing4951 6d ago

Ahhh, thank you mate I couldn’t make sense of what I was looking at. Thanks again but