You can add more batteries to your solar panel kit to help prevent energy waste, and enable you to power more appliances during emergencies.
In most cases, the best setup draws power evenly from all of the batteries in your system. In larger arrays, this can be a dozen or more batteries. Spreading the load helps reduce the risk you’ll drain any battery too far. If possible, try to use the same type of battery throughout your entire solar grid. This helps reduce the chance that differences in systems will cause damage somewhere.