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9 Jan, 8 tweets, 5 min read
Does solar still work with @Tesla #Powerwall when there is a power cut?
We're testing right now, unplugged the house fuse with Powerwall at 100%
The answer is yes, and the internet works, and can even charge the car, however..
Explanation follows...
Thread 1/7
@evmanuk @bobbyllew
The house power before unplugging the power, 1.5kW usage, 0.4kW from the solar, 1.1kW from the grid.
Then we pulled the fuse for the house, everything stayed on, the Powerwall kicked in immediately. However the solar disconnected as the Powerwall was at 100%...
... plugged in the car, limiting it to 20A to keep the power draw a bit lower (not necessary as we have 2 Powerwalls so it can output 10kW), with the batteries at 100%, and the solar started up!
.. after a little while, stopped the car charging, with 92% in the battery, the solar stopped, then a minute or so later the solar started up again, and has been running since then...
It appears that the @SolarEdgePV inverter is detecting the load on the internal house grid, and as the battery is full, the voltage is likely to be slightly higher, the inverter detects this and stops running until it gets lower...
When the large load of charging the car is added to the house grid, the voltage likely drops slightly, enough to get the inverter to see there is a demand and be within the safe limits.
As the battery empties, the solar takes over and the battery backs off...
To summarise, in a power cut, and the @Tesla #Powerwall is full, the solar cuts off, if the load is high enough, it will start up, even when full.
As the battery starts to empty, the solar kicks in.
If there's enough solar it even recharges the Powerwall (see the last image)!
... And the whole house being powered by solar AND charging the PowerWall while the house is off-grid

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