I have one but no way of knowing if it's working. Can I check at the battery to see if it is working?

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Don
240TD
2014 4x4 GMC crew cab

Yes - the simplest way is to check the voltage at the battery terminals. If you see a reading above 13.0V, SOMETHING is charging the battery. Of course, you need to have all accessories inside the trailer turned off when you do this, since they can reduce the available voltage.

- Jack

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Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH, Progressive Dynamics Converter, Fan-Tastic Fan, LiFePO4 battery 12V DC Electrical System, SoftStartRV mounted on A/C
2024 F150 Platinum FX4 3.5L PowerBoost SCrew

Pick a sunny day. Disconnect the trailer from shore power and and cover the solar panel with something opaque (cardboard, etc.). Check the battery voltage with a multimeter. Uncover the solar panel and check the voltage. You should see a slight rise.

If you don't see any difference, run a few things on the battery for a bit to discharge it some. You can do this by lowering and raising it a few times, running the refrigerator on battery power (not propane) for an hour or so, etc. Then measure both voltages again.

If you see a voltage rise in either case the panel should be working. You may want to use a digital multimeter because the difference may not be enough for an analog one to pick up.

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Raul

2408T
2010 Nissan Frontier, 4x4, Crew Cab

Thanks. it seems to be working I need more sun time raining here

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Don
240TD
2014 4x4 GMC crew cab