question

jambeaty avatar image
jambeaty asked

New Solar System Set-up

system design
2 comments
2 |3000

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

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

0 Likes 0 ·

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.

0 Likes 0 ·
1 Answer
jambeaty avatar image
jambeaty answered ·

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

4 comments
2 |3000

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

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).

0 Likes 0 ·

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?

0 Likes 0 ·

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

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

0 Likes 0 ·

Thanks so much!

Sometimes we get nervous & second-guess ourselves.

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

0 Likes 0 ·