Greetings - my first post on EAA forums!

Question - I'm looking at purchasing a nice factory built motorglider with a DIY gas to electric motor conversion using a Rotex RET-60. The owner reports that the controller and inverter provided quickly failed. He's tried a couple other brands, same problem.

Anybody have experience with controllers & inverters and can recommend a reliable source? The installation looks to be very well done but is it possible there are gremlins in the system elsewhere?

My knowledge of all things electrical wouldn't wet a thimble so suggestions are most welcome.