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 > Cut off switch with solar panels

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Old Days

Colorado

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Posted: 03/19/20 10:33am Link  |  Quote  |  Print  |  Notify Moderator

Thanks I have used them before, the voltage is around 22 to 24 volts the amps maybe 12 or 13 amps combined. thanks for the help.

4x4ord

Alberta

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Posted: 03/19/20 12:09pm Link  |  Quote  |  Print  |  Notify Moderator

work2much wrote:

Old Days wrote:

Can someone post a link of a good switch to shut off power from 270 watts of solar to the controller. Thank you.


Something like this would be appropriate.
Circuit breaker


That one looks a little better but I bought one like this cuz it's significantly cheaper. Especially when you consider you don't have to solder lugs onto the wire.

Oops, forget it I didn't read it properly. Your looking for a 270 amp switch.


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4x4ord

Alberta

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Posted: 03/19/20 12:15pm Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

4x4ord wrote:

Maybe the wattage of his panels isn't enough to fry the controler
Maybe he's under cover..?


No he's not under cover but I think his solar panel might only be 100 watts or so. I think he has a GoPower system.

Edit: After thinking more about it I recall, now, that he pulls a fuse on his charge controller.

* This post was edited 03/20/20 06:36am by 4x4ord *

4x4ord

Alberta

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Posted: 03/19/20 12:16pm Link  |  Quote  |  Print  |  Notify Moderator

work2much wrote:

Yes, most controllers need to have 12v power to turn themselves on and running solar panels to them without the battery connected isn't advised. On our Victron it omits the high voltage alarm to remind me.

It is a good idea to circuit protect the wiring anyway so I installed a blue sea circuit breaker between the roof combiner box and the solar charger to protect the cabling anyway. It is mounted inside the camper on our system as I like to turn off the solar once the LFP batteries are full or close to full. LFP doesn't benefit from a small trickle charge when full or close to full. This could be mounted anywhere between the panels and the controller.

[image]
[image]Click For Full-Size Image.

On the battery side I also installed a circuit breaker between the solar charger and the battery to protect that cable as well and to work on the solar charger if needs to be deenergized but I wish to keep the rest of the system live.

[image]
[image]Click For Full-Size Image.


Nice job.

naturist

Lynchburg, VA

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Posted: 03/19/20 01:59pm Link  |  Quote  |  Print  |  Notify Moderator

jdc1 wrote:

Old Days wrote:

Can someone post a link of a good switch to shut off power from 270 watts of solar to the controller. Thank you.



https://www.amazon.com/Ampper-Battery-Disconnect-Isolator-Vehicles/dp/B07JZ9NDH2

This is all you need.


No, that is pretty much guaranteed to fry his charge controller. That is a battery disconnect, not a suitable switch for the wire between the panels and the charge controller.





naturist

Lynchburg, VA

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Posted: 03/19/20 02:02pm Link  |  Quote  |  Print  |  Notify Moderator

4x4ord wrote:

work2much wrote:

Old Days wrote:

Can someone post a link of a good switch to shut off power from 270 watts of solar to the controller. Thank you.


Something like this would be appropriate.
Circuit breaker


That one looks a little better but I bought one like this cuz it's significantly cheaper. Especially when you consider you don't have to solder lugs onto the wire.

Oops, forget it I didn't read it properly. Your looking for a 270 amp switch.


You misread. He's looking for a 270 WATT switch, nominal 24 volts, 15 amps. Huge difference.

Vette Racer

Oklahoma

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Posted: 03/20/20 09:55am Link  |  Quote  |  Print  |  Notify Moderator

I guess it depends on what brand of solar controller you have, I use a Blue Sky 30 amp controller and just disconnect the fuse going to the batteries to turn it off. Was told by installer that the Blue Sky has a time delay built in so you can disconnect or connect without a problem, panels never need to be disconnected. Been doing this for 3 years and no problems.


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