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An unscheduled power outage occurred this morning due to an electricity outage by Jemena. The 2xTesla Powerwalls kicked in but there was not enough power left in them as yesterday was cloudy and they didn't get a full charge. 5% backup emergency power wasn't enough to make it through the Jemena outage. I'm considering adding a 3rd Tesla Powerwall or more likely a generator. In the meantime I will change the Tesla Powerwall emergency backup % to 25% to give me 6kWh emergency power in the event of a grid outage like what happened this morning. The power was out for approx 1 hour and a half. 25% emergency backup should give me 3 hours of emergency power in the event of another outage.

ChatGPT thinks this is suitable:

Each Tesla Powerwall 2 has a usable capacity of 13.5 kWh, so with 2 Powerwalls, you have 27 kWh of total usable storage.

Your power usage is 2 kW continuously. Over 3 hours, you will consume:

2 ext{kW} imes 3 ext{ hours} = 6 ext{kWh}

To ensure your Powerwalls have enough energy stored for a 3-hour outage, you should set your emergency backup reserve to at least:

left( frac{6 ext{kWh}}{27 ext{kWh}} ight) imes 100 = 22.2\%

Recommended Setting:

Set your Powerwall emergency backup reserve to at least 25% to provide a safety margin and ensure it lasts at least 3 hours during an outage.

Clarke Towson

CEO

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