Hacker News Reader

Comment by Animats | Hacker News Reader

That's a nice backup unit.

That's very Japanese, weatherproof and suitable for outside wall installation on a concrete wall. Tesla's Powerwall is intended for indoor installation. This is something to bolt on the wall alongside the outside part of the split air conditioner.

View on HN

>Tesla's Powerwall is intended for indoor installation.

Powerwalls can be installed outdoors. Mine are installed on the exterior of my home.

I have seen discussions of local codes in parts of the country requiring them to be installed outside due to perceived fire risk.

> perceived fire risk.

> https://www.reuters.com/world/asia-pacific/fire-breaks-out-t...

To be fair, an actual fire risk is one of the biggest reasons something might be perceived to be a fire risk.

Powerwall can be installed outdoors: https://www.tesla.com/powerwall#powerwall-specifications

The temperature rating (-20C to 45C) seems decent but doesn't cover every clime. Tesla's powerwall is a better bet - indoors where you can worry less about external temperatures.

Highest temperature recorded in Japan is 41°C.[1] So this is fine for the domestic market.

[1] https://www.nippon.com/en/features/h00268/

Officially recorded temperature is measured on managed environment, so real temperature could be higher. Still, it's rare to be over 45C, and it's "operating temperature" so maybe the battery can be just shutdown on rare very high temperature situation.

Powerwall is installable outdoors. Though like all batteries (including this one) it will do better in moderate temperatures.

Are these backups with a transfer switch, or in-line? Real in-line would be great during voltage sags.

Reply on news.ycombinator.com