Attaching remote panels in series (24v) to a controller with a constantly mounted 12v panel

[JCDriller]

My trailer has a 50w panel mounted on the tongue box to keep the batteries healthy when not in use. However, while camping I have 2 folding Renogy 100w panels that hook to the same solar controller via a mounted SAE plug. I'd like to wire my remote panels in series to take advanage of the 24v they can offer, however, what happens if I'm still connected to the 12v panel? Will it reduce he voltage to 12v defeating my remote panels configuration?

Whats the best way to overcome this? I guess I can put an inline switch between my 50w panel and the charger for use when the remotes are hooked up.

Thoughts anyone?

 

[luthj]

Assuming the 12v panel has a blocking diode, it will reverse bias and stop that panel making power. The other 24v nominal panel will perform as normal. I am assuming you have a mppt controller rated for the higher panel voltage, which is around 36v open circuit.

Another option is a second controller for the larger panel, this allows both to make power simultaneously.

 

[john61ct]

Yes the best is one well-matched controller per panel.

But if you put multiple panels on one SC, they should all match.