The Solarstate SRX-6-12 voltage regulator is an industrial quality shunt regulator which controls battery charging in small and midsized photovoltaic power systems. It is extremely efficient, compact, reliable, economical,weatherproof, and meets nationally recognized safety standards. Its solid-state circuitry uses a low-frequency switching shunt technique to control battery voltage. The SRX-6 can be installed in the junction box of most Solarex modules. It is capable of controlling Solarex modules with current output up to 5.5 amperes, and is available for 12V and 24V systems. As many as six SRX-6s may be operated in parallel, enabling control of arrays with up to 33 amperes of current.This is a very cost effective means of regulating midsized arrays efficiently, and enables incremental expansion of small arrays.