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 ?
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.
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.
Hi Ian,
A double pole switch will not provide you with protection from the huge power of a lightening strike. Some solar controllers such as Victron allow you to turn off charging thereby allowing you to isolate the solar panels.
Does this method comply with the Australian Standard referenced in legislation?
Yes it does because the applicable Standard is AS/NZ3001:2008, referenced by the Vehicle Standards Bulletins (VSB1 for trailers 4.5t and under) written under the Road Vehicles Standards Act 2018. Under that Standard there are no controls for Extra Low Voltage circuits.
7.3 Other electrical systems Electrical installations on a trailer that are intended for connection to an AC power system other than that of the tow vehicle must comply with Australian Standard AS/NZS 3001:2008 Electrical installations Transportable structures and vehicles including their site supplies.
Whilst it is a good idea to be able to isolate your solar panels I have seen a number of recent builds where manufacturers do not provide a method of doing so. Yes you can use a double pole switch and other alternatives are.
