It’s not that long considering that solar panels have been niche adopted by the wealthy, environmentally conscientious or tech geeks. The Powerwall’s output is restricted to 2kW, which means that an further battery need to be purchased for each 2kW of desired energy output – really should the extra storage capacity be wanted or not. The MPPT optimizer function is at the input of the DC-DC exactly where it finds the optimum voltage for the solar PV for max VI or energy. The solar city statement on Hawaii is a clear shot across the bow to HECO that they are not going to lose any consumers due to HECOs ban on new solar grid ties. If the input offered is the exact same as the load, the battery has no effect at all.
What I still see as imminent is the positive aspects of scale that Tesla is uniquely positioned to take benefit of. Nobody other residence storage battery retailer is straight making cells at the scale required for EVs…meaning that Tesla will be able to undercut just about any person else’s pricing. There are some crucial Lithium based technologies left out that would cast the Tesla battery in correct light. If you were on that Texas strategy exactly where you get energy cost-free at night, and use to time shift then it is a uncomplicated shift on sizing. This severely limits application #2, daily cycling, as the battery could only be charged by the PV.
There are factors that go far beyond the per-kWh value of a battery pack — lifecycle, size, the battery management technique, other hardware and computer software expenses, etc. Prior to the grand announcement, solar panels and all that other stuff had been currently available. This is all based on a recent Deutsche Bank report leaked to RenewEconomy , by the way.
There’s 1 other residential battery storage provider with some numbers to compare to Tesla’s providing, but it did not truly fit nicely into the table above and it did match nicely in the second-to-last section under, so it is incorporated at the bottom there. Well, also note that Elon has stated the 7 kWh contains a DC-to-DC inverter” and one’s residence solar power system would include the required DC-to-AC inverter, for up to ~four-5 Powerwalls. A battery system is pretty raw without having it. And it has a BMS as portion of the charge control.
As an off-gridder, this world of batteries and solar and inverters has been forced upon me. When you can not get out of it, get into it! For everyday cycling you are using the battery to shop solar for self use that would otherwise go to the grid and possibly for peak demand shaving or shifting. A battery that charges the double but lasts anything more than 3 000 cycles will simply obliterate Tesla. Tesla Powerwall is compatible with all solar panel inverters, excluding microinverters, that are hardly ever employed.