Tuesday, May 14, 2024

Residences as Utility Infrastructure

The universal first troubleshooting step is to reboot. No matter what the product is, no matter what the problem is, try turning it off and back on &emdash; which is how I found myself figuring out how to reboot a solar inverter. It turns out to be difficult to power cycle something which makes its own power.

When we added solar panels to the roof in 2019, we chose a SolarEdge inverter with an integrated vehicle charger, expecting to never acquire another gasoline car. We have been happily using the SolarEdge inverter to charge the EV we subsequently acquired.

Happily charging until Saturday, that is. I boggled plugging in the car, quickly pulling the plug out and back in without fully intending to. The inverter beeped and the car's indicator lit when first plugged in, then turned off and didn't come on again. There it sat, neither charging nor disengaging no matter what I did. Left a few hours, it just sat there not charging. Plugging it in again the next morning did not change anything.

So: time to reboot it.

Getting an inverter to fully reboot requires cutting power from every source that sneaky thing might use:

  1. Turn the switch to disconnect from the photovoltaics.
  2. Turn off the breaker where the inverter connects to the house electrical panel.
  3. Pull the shutoff switch to disconnect from the grid completely. This would have powered off the whole house were there no batteries.
  4. Wait for capacitance in the inverter to drain and all of its LEDs to turn off, then another 60 seconds.

Commercial buildings have long been responsible for substantial utility infrastructure, from boilers to electrical transformers to, sometimes, subway connections and underground steam tunnels. Residences have typically hosted much less infrastructure, and the equipment has been gradually refined so as to be simple for the homeowner. Ground fault breakers, electric starters for pilot lights, and so on have all been developed to minimize the need for a residence to have to deal with odd failures or dangerous conditions.

The clean energy transition is moving more infrastructure into residences which might once have been exclusively the domain of a service provider. Very few homes have a private gasoline station, but many will have private chargers. Very few homes have generators supplying their electricity, but many will have solar and virtual power plants using residential batteries in unison are already here.

The design of infrastructure for residential use has to take into account that the property owner won't be knowledgeable about its operation. There won't be an engineering department, there won't be anyone paying attention to it. I have on the whole been happy with the inverter and the Powerwell it connects to, but there is more to be done to handle odd cases like this.