diy solar

diy solar

Circuit breakers

Mickie

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Feb 24, 2022
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I have a 245w 24v solar panel 60amp mttp solar charge controller
Battery bank of 30ah sealed lead acid will upgrade soon but that's it for now inverter 500w1000w peak. What circuit breakers would I need between each stage?
 
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A single solar panel does not need a fuse/breaker; however, you are free to use one. The panel label should indicate a max fuse rating. Use that.

If you use suitable wires and plan to use 60A, fuses/breakers should be sized for 1.25X max current, so 75-80A depending on what's available.

Cheap fuses and breakers are not recommended. Many cheap products on Amazon fail to meet rated performance.
 
The wire from the panel to the controller is 2.5mm
The wire connecting the battries to panel is 6mm
 
"max overcurrent protection rating 20A"

I assume you mean mm^2, not wire dia.

2.5 is between 13 and 14 gauge and good for 22A @ 40°C (per EN 60204-1); Max panel output is Isc = 10.54A

6.0 is between 9 and 10 gauge and good for 37A @ 40°C; Max charge current is 340W/12V = 28.3A
 
"max overcurrent protection rating 20A"

I assume you mean mm^2, not wire dia.

2.5 is between 13 and 14 gauge and good for 22A @ 40°C (per EN 60204-1); Max panel output is Isc = 10.54A

6.0 is between 9 and 10 gauge and good for 37A @ 40°C; Max charge current is 340W/12V = 28.3A
Hi Sunshine,

I have a 2.5 mm wire between my roof of my campervan and the regulator.
I want to install a new solar panel with Isc=11A, (old one is 100W and 6A Isc)

In most forums I have read, they recommend to install a 6mm wire which I find unnecessary.
I think they are concern about the power loss and the loss of voltage in the wire, because the 2.5mm can easily transport the Isc of my solar panel.

The question is, Am i safe with my 2.5mm installation?

thanks,
Diego
 
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