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jambeaty asked

New Solar System Set-up

system design
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jambeaty avatar image jambeaty commented ·

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 avatar image klim8skeptic ♦ jambeaty commented ·

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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jambeaty answered ·

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 avatar image klim8skeptic ♦ commented ·

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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jambeaty avatar image jambeaty klim8skeptic ♦ commented ·

Thanks for the link on wire size/voltage drop.

Now about the fuse. Our salesman supplied this MAXI FUSE. (Along with the 4awg wire) Did he chose wrong?

Would this fuse type be acceptable?

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klim8skeptic avatar image klim8skeptic ♦ jambeaty commented ·

4 awg will be ok, fuse holder looks v/good.

I would use a 70a (maybe even an 80a) fuse.

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jambeaty avatar image jambeaty klim8skeptic ♦ commented ·

Thanks so much!

Sometimes we get nervous & second-guess ourselves.

I appreciate your thoughts & time. We’re going to start with installation today!

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