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It’s approximate. It stores 13.4 kWh of power. You can trickle it as long as you want. But just like any battery it will run out if you don’t charge it.

Well, that's really good to know. To me it makes the cost more justifiable. Personally, I think it's important to ration out the electricity during times of need. Get down to basics when the going gets tough. Two, or more, days would be ideal, but you have to work with what you've got for now.

You can always put a second powerwall if you are so inclined. Each cost $10K currently.

Yeah, that makes sense too. Your article gave me something to think about as I'm planning for my final move in about 2-3 years. We've got two kids and are also caring for ailing in-laws. I mean 20 grand isn't cheap, but what wouldn't you pay to keep your family safe.

My current emergency plan involves lightweight equipment and cooking supplies that would last for about 1 week. However, a flaw in my plans would be energy supply for any medical equipment I would need over time.

Tesla makes some very good equipment. In California, the company I work for is using them to develop a battery power station to enhance grid stability.

Price of these things are coming down constantly. You can always add a Natural Gas generator as well. Which is clean and environmentally friendly. Provided you have space in the backyard and a natural gas connection already