As the title indicates, I am looking to install a solar field on my property to offset electric use. It seems like a no brainer in combination with geo (probably without it too). I'm in the gathering information stage and was wondering if there are any gotchas that the experienced folks on this board have run across to be aware of. I have enough open land that I plan to do a ground mounted array and can orient them due south. Some info/questions I have run across: 1. Green Power Energy is a solar installer near me that has been both recommended to me and has seemingly outstanding reviews online (4.8 on Google with 181 reviews). Anyone have any experience with them that would suggest the hype isn't real? 2. Field Sizing: We installed geo last fall so I have a full winter's records of electric use but not summer. My summer electric use records will still have the 30 year old A/C electric draw which likely overstates anticipated use with the geo. But, we are very likely going to have a pool installed at some point presumably with a heat pump pool heater. I really don't want to wait a year or more (and have federal tax credit drop 4% or become 0%) to get records of actual usage. How problematic is it to size a field on anticipated use? Electric provider documents seem pretty adamant that I can't have a grid tied system and produce more than I use over a year. Is this because they will cap credits or is there some actual physical/connection issue with it? 3. Ground mounted arrays - everyone seemingly does roof mounted but I suspect that is because they don't have the land area for ground mounted. I understand ground mounted may be more $ upfront because you have to build the structure that supports the panels (whereas your roof is already there). Are there any downsides to ground mounted? It seems like it would be a much better fit because I can dial in the array tilt and orientation (to the south) and potentially change the tilt where as roof direction and tilt are fixed. Something I am missing? I am assuming the structure to support the array would be included in the federal tax credit (I understand roofing replacement isn't)? 4. Anyone use batteries with grid tied system? I was thinking this might be a viable option on two fronts - one to power them up during day and then discharge at night ala Tesla powerwall with grid backup to pick up any overuse/undercharge - ie keep as much power produced on site and minimize electric company credits/interaction. But the second part that intrigued me (and potentially more importatnt) was to be able to use the batteries in a power failure instead of having a propane or gas generator backup. I know most grid connected solar fields go dark due to the inverter shutting off when no grid power available. But I don't think that is the case when you have batteries and Tesla's stuff seems to anticipate the use of batteries when grid power is expensive or not present. I tend to favor this arrangement over having a big generator with a bunch or gas or a 500gal propane tank sitting idle for potentially a year between uses. Obviously there are alternatives to Tesla but more interested if anyone has done this and how it has worked out. Would really like to get rid of need for big, idle generator for that once/year or once/2 year power failure. Thoughts on my planning?