Valdemar wrote:I got an unsolicited 14kWh PowerWall quote from LA Solar Group via e-mail, they installed my array 2 years ago so they send me spam every now and then. $12,500 turn-key, SGIP rebate $7,000, $5,500 cost before a potential 30% tax credit, so about $4,000 if everything pans out. I haven't checked into details if these numbers are realistic, if anything I expect the cost will be higher than that.
That is higher than the bid I accepted, but I used Pick My Solar to obtain the bid and informed them of Tesla's estimate. To save costs, I'm planning on simply backing up the main service panel rather than adding a "critical loads" subpanel. Also, $7000 for the SGIP rebate assumes that you get the maximum possible amount, which may or may not happen.
Valdemar wrote:Our system generates enough so we end up with a credit on TOU-D-A each period even though we generate less than consume, so the battery doesn't make much financial sense on the current SCE rate schedule.
If you have plenty of PV generation during peak hours, then it's harder to justify a battery in SCE territory. But what if you should add a long-range EV such as a Model 3 and thereby increase your electricity consumption? Something else we are considering (though probably not this year) is replacing our gas range with an electric one, to eliminate CO emissions inside the kitchen (the vent fan is noisy and we tend to not use it).
Valdemar wrote:Being able to have a backup energy source is appealing, but 5kW max continuous from the battery may not cut it for us, may just get a backup generator instead.
Could you use a subpanel to back up only your most critical loads? Or, in the event of an outage, would it be an option to manually switch off energy-hungry devices and stay under 5kW? That's what I think we'll need to do.