1. The most common reason for this type of problem is a bad battery. It is highly recommended that the battery be load tested at a battery store to verify that it is good. The load test is the only sure way to know if we have a good battery.
   
2. If the battery load test good then other items need to be checked such as system design, installation or possible charging problems with the battery controller.
   

System Design and Installation

1. Verify the solar panel is facing in a South to Southwest direction and that the panel surface is not shaded by some object.
   
2. System design refers to the accessories connected to the system. Accessories connected to the system cannot use more energy than the charging system can provide. Not all accessories are created equally and some manufacturers use much more energy than others to perform the same function. These concerns are minimized in an AC charged system where the charger has power connected to it continually.
   
3. If the 120 VAC power checks good then disconnect the DC adaptor from the battery controller. Using a volt meter check the transformer output. The transformer should read about 20 vdc, if the transformer output is incorrect the transformer needs to be replaced with USAutomatic part # 520009.
   

Solar Charged Systems ONLY

1. Remove the solar panel plug from the battery controller input and measure the DC voltage from the solar panel. It typically should be about 19 to 22 VDC. This reading must be taken when the sky is clear and the sun is up directly on the panel.
   

This reading does not guarantee the solar panel is outputting the correct current to keep the battery charged, but it is a good first check.