Two series-connected 12 V batteries, which are individually charged and monitored, are used as back-up power. This enhances the life of the batteries and avoids the need of matched batteries when a replacement is necessary.
The UB20 is self-explanatory, easy to operate and has extensive battery diagnostics and many protective functions installed. The output of the DC UPS is decoupled from the input. Load circuits can therefore be split very simply into buffered and unbuffered branches. The energy of the battery can thus be used selectively.