Solar/Electric issue

We keep it at an RV park - no hookups.

The solar panel says its charged.

The lights do not turn on.

The GFCI is working, no blown fuses.

Can anyone help me?

Lisa

A: Did you physically check to see if the battery was connected and that the polarity was correct?

B: Did you physically check the battery cut-off switch (if installed) to ensure it was turned on?

C: Did you check the power center to see if all the fuses were good, especially the two 40A ones that are the reverse-polarity protection fuses?

D: If you plug the trailer's connector to the tow vehicle, does it make any difference?

There are possibilities, but there isn't enough information to go on to say for sure what is happening. For example, GCFI outlets are not going to help diagnose problems in the DC power system. They are for AC outlets, so unless you have an inverter providing AC power, you will not see power from the AC outlets or anything else that uses AC. If there is an inverter, and it was left turned on, the battery may be shot as the inverter may have run the battery down so that it does not hold a charge properly.

First thing:  Get a voltmeter. Take a reading at the battery. A nominally 12V battery at rest when fully charged should read 12.7V. If it is less than this, it is not fully charged. If it is below 11.6V then that is in dire need of charging. Below that runs the risk of the battery being damaged so that it can't hold a full charge in the future.

Lithium Iron Phosphate batteries, on the other hand, have a battery protection circuit that will allow deeper discharge and will disable the battery to protect it if it is discharged deeply. Sometimes, that requires a procedure to "wake up" the BMS so that the battery can be charged. I've had that happen when the dealer neglected to turn off the battery disconnect switch while our trailer was there, Once I was able to get the BMS reactivated, it took the charge and there was no damage to the battery.

So, please help us to help you by giving more details about the problem and what steps you have taken to troubleshoot the problem.