Is my extender breaking my Tesla Powerwall?

The short answer

Low data needs, so an extender is often enough. Cheap extenders make a second network. Once your phone and the gadget end up on different halves of it, they can no longer find each other.

What's happening underneath

Cloud, plus local control on some systems. An extender that makes its own network name puts your phone and the gadget on two different networks.

Source: Manufacturer documentation

Try these, in this order

• • Keep the same Wi-Fi name and password when you replace a router — nothing then needs re-setting.
• • Check the signal where the unit is fitted with your phone.
• • A mesh box in the garage or utility room is the usual permanent fix.
• • Check the signal where the gadget actually lives, not where you're standing.
• • Move the router off the floor and out of any cupboard before buying anything.
• • Put the gadget and your phone on the same Wi-Fi name.
• • Restart the gadget before the router — it is quicker and it fixes more.

Setting it up again properly

• • Stand next to your router while you set it up, then move the gadget to where it lives.
• • Put your phone on the 2.4 GHz network name for the setup, or use one name for both bands so the phone can follow.
• • If your router splits bands into two names, turn the 5 GHz one off for five minutes rather than fighting it.
• • Turn mobile data off on your phone during setup — some apps quietly use it and never find the gadget.

When it's worth spending money

One mesh box near the install, only after checking the signal there.