I'm in over my head, would someone kinly throw me a life ring?

I don't know enough about electronics/electicity to know if I am in the correct place to seek some help, but if not, please pardon my intrusion.

In the past, I have help clients locate many diverse (read obscure) devices,products, vendors, technologies,etc.......

Today,I was asked by a client to help him find an inverter that would convert a 76vDc input to a 110vAc out put. The current draw would be about 500ma. I know just enough about electricity to know what an inverter does, but I've never sourced them before. Thie client has an EAU of 3-5000 units. I've googled (76vdc invert,etc) and found great sources for inverters to run the coffemanker while you are driving, however the device I seek has not been found.
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