1. I do not understand what you mean by running on Solar Power. The refer is operated by either 120 volts or LP gas
2. The batteries are ONLY for powering the LP lighting system.
3. You have a NON RV Absorbsion refer. But, it functions just like an RV refer.
4. So, if it will not cool, then it needs to have ALL parameters checked out. If it will not stay lit on LP or it fails to cool correctly on LP, the LP PRESSURE is the FIRST thing to check.
5. It takes 24 hours for this type refer to get to maximum low temp.
6. Just like RV refers, the rear ventilation is critical.
7. You are on the wrong forum for this problem. This is an RV Forum and NOT an forum for residential Absorbsion refers. Your Brand and install are not how RV refers are used. You need to find an "off the grid" type forum for your problem. You refer/brand is NOT used in RV's. Doug
