I will guess the same as Martin that the 300W inverter may well be a simple push-pull converter (square wave) with a step-up transformer without the rectifier followed. However in this case, it is not so easy to take 24V input since you need to modify the transformer turns ratio to half of the original. I think that Martin is correct that there will be plenty of inverters that run natively on 24V. Anyway 24V bus is the standard in the automation world. All of my DC design work with either 20-30V or 10-30V with 24V DC being the nominal value. Regards, Xiaofan -----Original Message----- From: Martin Klingensmith [mailto:martin-distlists@nnytech.net] Sent: Sunday, July 10, 2005 6:42 AM Gus Salavatore Calabrese wrote: > I have a bus that runs a 24Volt system. It is a pain to supply 12V > to accessories. What recommendations would there be to adapt a > converter ( 12V to 110VAC converter 300watts ) to run on 24VDC ? > Any chance the the adapter would take the higher voltage directly ? There are many inverters that run natively on 24v. I think I know the "300W" inverter you speak of, it is a very cheap squarewave unit, correct? It might take 24v if you were to analyze the circuit and determine which parts would require modification. ... -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist