These micro inverters are a cool near-term portable solution for those looking to dip their toes into home energy storage. Ultimately, I hope we see residential DC electrical become more commonplace soon. That will make the grid integration that this tackles a non-issue for most (i.e. those who aren’t selling their excess solar capacity) but will ultimately be simpler and more efficient for the grid as a whole.
The average home has only a few devices left that still use AC internally (mostly large or old appliances) and home storage systems lose energy to power conversion overhead in both directions at multiple stages. Since each conversion represents a loss of up to 20%, the AC standard introduces an increasing amount of unnecessary friction close to the point of delivery.
Illustration: if your home charges from the grid, that’s one conversion AC —> DC. If you then use that power to charge an electric vehicle, that’s two additional conversions AC —> DC —> AC —> DC (currently few EVs support DC charging unfortunately). If you then charge your laptop in the car using the official charger, that’s two more conversions AC —> DC —> AC —> DC —> AC —> DC. Altogether this requires about 3x as much power than necessary with residential DC electrical, since then the power can go from solar to storage to car to laptop without the need for power inverters.