I thought grid tie was for putting your surplus into the grid. I'm still growing, only have 165 watts worth of solar panels. More than enough for lights, and looking to run a few small appliances and tools. Haven't gotten a larger battery, or installed all the panels yet, but won't be long. Not a great deal of power, and figure on running out often, until I get adjusted to the capacity. I've got a 1500 watt inverter, but might be a little much, says it needs a 150 amp fuse. Thinking a 100 Ah battery may not get charged on a daily basis, and that much of a load would drain it quick. Just got an 800 watt inverter for my coffee pot, but haven't opened the box yet. Thought about a 12v coffee maker, but 40 minutes to brew a pot was a little unrealistic.