Florida house, I have had my solar 16.38 kW solar panel system for about a month now.
We only got two of the Powerwall 2 units installed with them. Now I wish I had ordered 3 powerwalls.
So a total of 27 kwh of Powerwall storage.
I have taken the two Powerwalls down to 5% to see how long it takes to recharge.
No problem, with the 16.38 kW system, it recharges to 97% by noon or 1 pm, even on a partly cloudy day during December.
I suspect it could even recharge a Tesla for 5-6 hours at 240v/24 amps and still refill the two Powerwalls before sunset.
During the summer, probably at a much higher amp setting.
It seems like the 27 kwh are enough to get through the night, but not with a huge safety margin.
Yeah, if I turn off both ACs (Florida, we have two AC units, 3,500 sq ft house) and the water heater, then it is easy to get through the night and have plenty to spare.
But what if I don't want to worry about it? We don't have natural gas for heating. This house is 100% electric.
So I am fine with the 27 kwh of backup storage for now.
In the event of a hurricane, I am sure I can manage to get through the night with most of my first world lifestyle intact.
That is assuming the roof survives the hurricane and we are then just off the grid for a week while the region recovers.
I am not planning on adding another Powerwall for now. However, I wish I had done a 3rd one, looking back on it, while the tax credit is 30%.
But in the future, in a few years once my storage capacity declines, I suspect I will want a Powerwall 3 added to the existing system.
Is Tesla making these things to be backwards compatible? Any word on if they are making Powerwall 2 and 3 compatible with older versions?
Will we be able to just add a Powerwall 3 into the garage next to existing Powerwall 2?
Thanks for reading and considering my horrible first world problems.