We've got hundreds of hours of experience on these. We've drawn schematics of the DC-AC module and the drive circuits on the mainboard. We've developed a method of repairing them that includes checking all of the drive circuits and signals. We then connect the module so we can monitor it as we increase the input voltage from a current limited outside source. Once we have it running at the designated DC input voltage (215VDC) we monitor the waveform to ensure a clean stable sine wave output.

We've found a set of components that degrade over time and cause the sine wave to be noisy at the peak (see photo). We believe this is the cause of the modules eventual demise. If your unit has a dirty waveform then contact us and allow us to repair the module at a modest cost before it burns up and takes out the drive circuits on the mainboard. If you're handy and can remove the DC-AC module yourself you can save some shipping costs by sending it alone for repair.

If your unit has failed it will likely need a rebuild of the DC-AC unit as well as some repair work to the drive circuits (see photo). We will need the whole unit shipped for this process.

The repair price of $1000 is for rebuilding a unit that has a noisy waveform but has not yet blown or burned the power transistors. This is approximately 10 hours work, includes replacing many of the capacitors on the motherboard, a new transfer relay and replacing capacitors in the three power modules. It includes return freight and a one year warranty.

The repair price of $1500 if for repair of a unit that has blown the output transistors. It includes all of the work above plus replacing the power transistors and rebuilding the four quadrant driver array on the motherboard. The driver array is always burned up by a power unit failure. This is a 15 hour job and also includes return freight.