I own a 2014 Volt with a factory Voltec 120 volt charger. My charger will only give me a green light (on Voltec) when plugged into the grid. When I try to use it with my 5500 watt gas generator or my 3600 watt Outback off grid inverter I only get a red light. All other appliances will work with the Outback off grid inverter including TV's, computers, printers, refrigerators and any other kind of sensitive electronics. What makes the Voltec charger different? Why will this charger not function when plugged into my inverter? This inverter is not a cheap Made in China item. It's made in the USA and costs $1800. Are there any electrical engineers out there who can explain what's going on?