Battery chargers for emergency can be either AC, DC, or AC and DC powered. AC powered chargers are ideal when municipal power is available or a generator being used for another purpose can be used. AC battery chargers are very fast and do a good job conditioning batteries. However, power may be out for extended periods of time. This is when you will need a good DC powered battery charger and quality solar power to charge the batteries you will depend on for communications and light. With batteries, chargers, and solar, quality counts.