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Post Info TOPIC: Isolating solar panels
Ian G


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Isolating solar panels
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I have switched from AGM to Lithium batteries. I have read when in storage it is best to leave them at 80 %, so when in storage I will need to disconnect my solar panels otherwise they will be on 100% always. 

I was thinking of putting a circuit breaker before the solar controller (I have a fuse there at the moment ) and just flicking it off, I have noticed the solar isolator switches I have seen online are 2 pole, ie switching off both positive and negative. Is it really necessary to switch off the negative ?



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Peter_n_Margaret


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Why not? That is the requirement of AS3001.

A lightening strike (for instance) won't care which wire it follows.
This is my new build under construction. 430W of panels per double pole DC breaker.

P1080116e.JPG

They are not expensive.

DC 1000V Solar Mini Circuit Breaker Overload Protection Switch 6A/10A/16A/20A/25A/32A/40A/50A/63A 2P DC1000V Photovoltaic MCB PV - AliExpress 13

Cheers,

Peter



-- Edited by Peter_n_Margaret on Monday 26th of January 2026 08:18:08 PM

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OKA196 DIY, self contained 4WD motorhome, 1280W PV, 326Ah of CALB LiFePO4 batteries, 1.3kW inv, 310L water, 350-450L diesel.
Ian G


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Good point, I never thought about lightning, not concerned about the cost, space is a bit tight in that area was my concern. Thanks I'll make room.

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