I've got a pretty old 7400 watt system installed back when the incentives from California were pretty good. It's lost quite a bit of efficiency over the years, and usually tops out at around 5200 watts, providing ~40KWh during cloudless days in the summer. I don't know much about net metering and incentives, but what I do know is that I can't make any major changes to the installation without ratcheting down to the current regulatory system, which reduces compensation for selling during off-peak hours.