Some Kisae products convert battery power from the 12V (or in some cases 24V) battery into household grade AC current (KISAE DC to AC Power inverters). Others replenish the battery when it is running down by recharging it from the utility (KISAE Battery Chargers). KISAE even makes some products that do both of these things (KISAE inverter-chargers).
There are KISAE products that protect the battery from being over-charged by a PV solar panel (KISAE solar charge controllers). And there are even KISAE products that integrate a battery with some of these products, resulting in stand-along power sources (KISAE Home Solar Kits and Powerpacks).