I would install a temporary system on your roof, like I did on my house. My roof is concrete tile, so instead of drilling a ton of holes through the tile, and having to worry about leaks, I just used some flat steel bars to hang the panels over the roof peak. I bent the steel in a 90*, and twisted it 90* sideways in a vise, so after I bolt the steel to each panel it forms a nice bracket that drapes over the peak. I even chained a couple panels together below that, using eye hooks. I would use a grid-tie inverter, or micro-inverters, instead of a battery-based setup, and just sell back all day long to offset your usage. The only downside to my system is that I have to remove it whenever a hurricane comes close.
(PS-I do also have a separate 7.6kW, properly lagged-down system on my garage roof, which has regular shingles.)
2012 Glacier Pearl SL - Delivered December 8, 2011
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Tesla 70D | Titanium Metallic | Matte Obeche Wood Décor| All Glass Panoramic Roof
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