Solar wiring question, 2022 2720QB

[JRockeyLuo]

Hi,

I have a 2022 2720QB that is pre-wired for solar. I want to install solar panels myself and install a solar charge controller in the cabinet under the sink.

Can anyone help to explain how I should wire the solar charge connector? More specifically, the pre-wired solar panel connector (red-black wire pair) does not show any voltage, which means they are not directly connected to the battery. If this is true, what are they connected to? I can find the red-black wire pair in the cabinet under the sink, but it looks like they pass through the sink. Where do they go? If they are not directly connected to the battery, how can I find the battery wires in the cabinet under the sink?

Thanks very much!

Best Regards,

Rockey

 

[JRockeyLuo]

Sorry, I figured out the answer myself. Both solar connection wires (red-black) and battery wires (black-white) are indeed left unconnected in the cabinet under the sink. So it is very convenient to connect them to the solar charge controller.

 

[Wavery]

Sorry, I figured out the answer myself. Both solar connection wires (red-black) and battery wires (black-white) are indeed left unconnected in the cabinet under the sink. So it is very convenient to connect them to the solar charge controller.

In my personal opinion (I've wired a lot of TMs for solar), the under-sink location may not be the the best place for the solar controller due to the possibility of plumbing leaks.

You are limited on places to put it but under the dinette is an alternative space that may be drier (even with the water tank there). I have even mounted solar controller (and breaker) on the front (or rear on models with rear battery storage) wall of the camper. It's protected against rain when set up and totally covered when the roof is lowered. Attached pic is of a rear mounted (not your model) just for reference.

Either way, I highly recommend that you put a PV circuit breaker between the solar panels and the charge controller. If you want to service the battery for any reason, it's important that the solar panels be disconnected from the charge controller before the battery is reconnected. The best way to accomplish that is with this circuit breaker. It also protects you from short circuits in the wiring between the solar panels and charge controller. Select the one that matches the max amperage output of your solar controller.

Let me know if you need help selecting a charge controller. Also, consider that when it comes time to change your battery (which may be soon), you will want to consider changing over to a lithium (LFP) battery (research LiFeP04 batteries). They have a higher initial cost but should last longer than you will own your trailer and they are far more efficient.

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