Hi,
Where did the Solar charger come from? ? ?
Please can you post some pictures of your project, so we can see your component layout?
Do you have PV panels connected?
Can you completely disconnect the solar controller and with a DMM, measure;
- Resistance between Solar Panel + and Battery + terminals
- Resistance between Battery + and Load + terminals
- Resistance between Solar Panel - and Battery - terminals
- Resistance between Battery - and Load - terminals
Your solar controller has a LOW Battery switch off facility.
It does this by disconnecting the LOAD from the battery.
MOST controllers disconnect the negative of the load from the negative of the battery.
In your circuit, if that happens, the load will not be disconnected because you have -Battery connected to -ve load through your circuit.
You have an earth loop through your circuit, a part of that circuit is carrying load current.
Please some pictures.
Thanks... Tom... 