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Comment by cptcobalt | Hacker News Reader

For comparison to the Tesla Powerwall, in specs that matter:

Power: Toyota: 5.5 kW, Powerwall: 9.6 kW (off-grid).

Energy Storage: Toyota: 8.7 kWh, Powerwall: 13.5 kWh.

If you estimate an average power use of 2kW while off-grid, then the Powerwall gets you 6.7 hours, and the Toyota gets you 4.3 hours of power.

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I wonder what the average power usage is for this target market. I just pulled up my (Tokyo-based, February, 2 person ap't) power bill and it comes out to 670W on average over the month.

People complain about lack of central heating, but I do wonder if that means that in the end lots of space is not being heated.

EDIT: According to [0], Household consumption on average in Japan hovers between 800W and ... 1200W. Of course bigger battery = more time, but 8 hours and 4 hours is definitely qualitatively different.

[0]: https://www.statista.com/statistics/1291424/japan-energy-con...

They're quantatively different :-)

In Japan, Powerwall is also significantly cheaper than all Japanese maker batteries, last time I checked Powerwall's per-kWh price is only 1/5 of a Panasonic one. How could this happen?

Also Nissan Leaf price (3700kJPY/40kWh, without any grant) is closer to Powerwall (1200kJPY/13.5kWh, without any grant), despite Leaf come with full vehicle feature and V2H. I think Japan home battery market lacks competition.

Apparently Panasonic doesn't actually want to sell them.

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