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micro-inverters on each panel. I don't like the high voltage DC systems that feed down because there's a lot of inherent problems with that. It's simpler to run the micro-inverters and run at a AC voltage. The wiring size is tremendously reduced. In that way, it's modular. You can add onto it as you want to. So the first thing to do, the most cost effective thing to do, is to eliminate the top tier. And then as you eliminate the top tier and you have more money and you want to expand the system, then you go after the next tier down. That makes sense. We have the micro-inverter type and been very pleased with it. Our bill hasn't gone to zero. They have these little trickle charges they get you every month. You'll meet a rental or something like that. But overall, it took our electrical bill down to in the one or two hundred dollar a year range.