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rickp avatar image
rickp asked

Warning: Solar Newbie question... Fuses/Breakers/cable for my system

I am building a solar/battery portable system for emergency use. It is based on 4 Battle Born 12V batteries, in series pairs and parallel for 24V, 200AH total. I am using a Multiplus 24/3000/70 Inverter Charger and a 150/85tr Solar Controller (This is being upgraded to a 250/100, due to your comments. Thank you!). I will also be using a Victron 24/12/40 step down converter for 12V loads, which I expect to be few but thought I should account for, nonetheless.

I need to protect the systems with fuses or breakers, but am having a time determining the proper amp ratings, and exactly where to place them. Diagrams I have read don't agree, so I am guessing there are many ways to do this.

Can someone help, or provide a reference to information that would shed a little light on this subject? I am not totally new to electricity, but am new to solar powered systems and am not ashamed to ask for help when I need it. I'm not going to connect a wire until I know what I am doing!

Thank you in advance...


UPDATE:

I am including a diagram I did today showing the items I have (except the breaker on the Pos battery line, that one is a guess), and how I envision them to be connected. I have a feeling more fuses or breakers are required, and I am totally open to comment or suggestion on cable sizes or other needed additions or changes.

UPDATE 5/27:

Drawing updated to show upgrade to Solar charge Controller, per comments. Also added a slight upgrade in 24-12 converter capacity (40 to 70).

System Drawing V4 5-27-2020.pdf

fuses
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klim8skeptic avatar image klim8skeptic ♦ commented ·

Wire your panels 2 series x 2 parallel.

Renogy panel

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michaelvausr answered ·

Hi Rick, can you also tell how long your cables have to be? The fuse and the cable type depend on that

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rickp avatar image rickp commented ·

Yes, thanks. The entire system (except panels, of course) will be in the same location... one moveable enclosure. I can't imagine a single run over 3 feet on any connection.

Thank you!

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rickp answered ·

The last of the items will arrive next week. I’ll let y’all know how it comes out. I’m excited for the possibilities.

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