Hi
I have an Elgar UPS it is rated at 600VA 400 real watts, the output on a scope at full load (resistive) is a nice sine wave, no furrier lumps, and it runs cool. There the nice bits end. It had 3 x 6V 6AH batteries hence 18V. I have done a search on the device and contacted by phone the makers in the US, they sold the rights on it to another company and have retained no info themselves.
Has any one seen one of these thigs the best I can make of the ident label is Model:105 1.1. 400 UK the output is 240V 400 W. idealy I would like the cicuit diagram to see if I can alter the transistor biasing to run it on 24V. The inverter electronics is part of the main PCB and I would have to strip it to trace the circuit.
I did try it on 24V it still charged the batteries and delivered the full output, and ran cool, but as the thing seems to have such a nice waveform I don't want to fry it. neither do I want to run more than one battery voltage, I can live with 12 or 24V but 18V and though 400 W is useful I don't think it justifies a seperate battery system.
failing that anyone in the UK with an 18V system want to trade it for something 12V.
Anticipating
Brian.
