New Solar System Set-up

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jambeaty asked Jul 30, '19

system design

61f205fd-89aa-4815-b47f-ee385c0b4884.jpeg (1.9 MiB)

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jambeaty commented · Jul 30, 2019 at 06:39 PM

Hello, we’re trying to set up a new charging system on our sailboat. (12volt)

We have 2 365watt panels. We think we’re supposed to wire in series then to our 15amp breaker. Then to our Victron mppt150-60TR controller.

From the mppt to a 60amp maxifuse and then to the house batteries bank (3 4D AGMs)

Any advice? Thanks

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klim8skeptic ♦ jambeaty commented · Jul 30, 2019 at 07:08 PM

Hi Jambeaty.

Looks good, just keep the wiring between the Mppt and battery as short as practical and use 35mm (2 awg) cable to keep voltage drop low.

I would use a mega fuse instead.

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Answer 1 · 2019-07-30T19:15:34Z

jambeaty answered · Jul 30, 2019 at 07:15 PM

We measure 6’ between the mppt & the batteries. We have 4awg(25mm) wire. Do you think that size would be sufficient?

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klim8skeptic ♦ commented · Jul 30, 2019 at 07:25 PM

https://www.calculator.net/voltage-drop-calculator.html I work that out to a voltage drop of 0.18 volt (say 0.25v if you inclide a fuse+holder).

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