Thank you for your input Scott. I should have mentioned it is an interruptible power supply. The battery bank output is 54 volts DC. The inverter output is 120 volts AC. As previously mentioned it is a 5000 watt centralized emergency lighting inverter. It is approx. 15 years old. Trouble-shooting this kind of unit is not a forte of mine I must admit. For the most part I used your trouble-shooting method. All seemed to check out okay. My "hunch" is that it is either the control circuit board or the inverter itself. What do you think? I know I didn't provide you with a great deal of information. I'm just curious what you think.
Control Circuit Board Photo:
http://www.geocities.com/cinkerf/misc5.html Thank you,
Frank
[This message has been edited by Frank Cinker (edited 10-04-2005).]
