Without more technical information I'm wondering if the system is designed so that it's kind of like an off grid system and isolated from putting power back to the grid to avoid the issues that come with grid tie as everywhere has different rules and regs and best just for them to avoid it all togeher.
If that's the case you would probably be better off with any old panel and cheap inverters plugged into the wall.
As for it only usable when he ac is on that's actually not an issue here. In North tx your ac will be running pretty much any time the panels would be producing power and still allot at night.
I really wish solar stuff was available here as right now all the warehouses are on the east and west coast. Shipping is a killer unless you have half a truck load or more.
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