30 Amp Power Supply Charger/Maintainer. For use during service reflashing, complex maintenance, or the showroom floor where vehicle demonstrations can make sugnificant demands on the battery. In power supply mode, the PSC converts 120 volt AC line input into a virtually noise-free, nominal 13.4 volt DC output. In charger mode, the PSC delivers current up to the rated value for charging any voltage depressed 12 volt lead-acid battery. Once fully charged, the PSC detects battery condition and tapers current output to sustain accessory loads or offset any parasitic drain. Available in 30A and 55A configurations.