12-26-2016, 07:02 AM
This sounds like reinventing the wheel. There are already hybrid systems that allow you to do basically whatever you want. As to how and when you sell to or buy from HELCO that would be determined by your contract with HELCO. You can definitely put together a system that will only buy when your batteries get low but what's in it for HELCO? If I were providing a service and a customer wanted me to maintain a bunch of equipment so that I could save their sorry a** when they ran low but they insisted on gleefully telling me to go screw myself the majority of the time, I would either not accept them as a customer or I would make them pay through the nose for my putting up with them. In general the vilification of HELCO is silly.