• Posts
  • RSS
  • ◂◂RSS
  • Contact

  • Thinking About Generators

    May 15th, 2021
    power, preparedness  [html]
    Every so often I think about what we would do in an extended power outage. Generally this comes up when a crisis is in the news, so not a good time to buy things. During the February Texas Storm I set myself a reminder for three months later to think about generators. So: here I am.

    We currently have two sources of standard 120V power in a blackout:

    (2 kW is the capacity of the SPS; the panels themselves are rated for a total of 5 kW.)

    They do have downsides, though. The battery has a limited capacity, and the solar requires the sun to be shining, the panels to be clear, and the sun to be in the right part of the sky. They complement each other somewhat, using the battery to time-shift, but there are many blackout situations (ex: winter storm) where once the battery is depleted the solar wouldn't give us anything.

    A fossil fuel generator is potentially a good fit here. While it doesn't have the long-term properties of solar, fuel is cheap enough that you can have a capacity far larger than you would want to spend on batteries.

    For example, a generator can turn a five gallon can of gas into ~15 kWh. That's already much more than my battery, and each additional can of gas is far cheaper than a large battery.

    On the other hand, gas is a pain. It turns to varnish in a few months and (especially if it has some ethanol) it pulls in water from the air, so even if you're using fuel stabilizer you want to rotate it. It's not safe or legal to store in your basement, and the temperature fluctuations of storing it outdoors aren't great for it either. Storing gas in your car's gas tank could be good, since it will get automatically rotated, but most cars now have anti-siphon filters.

    Propane seems more attractive: it doesn't go bad, you can store it outdoors if you keep it out of direct sun, and while it's less efficient than gasoline a 20lb propane tank still gets you ~10 kWh.

    You can get inverter generators that can take both gasoline and propane (ex: $535), which seems like a good combination? Thoughts?

    Comment via: facebook, lesswrong

    Recent posts on blogs I like:

    100 years of whatever this will be

    What if all these weird tech trends actually add up to something? Last time, we explored why various bits of trendy technology are, in my opinion, simply never going to be able to achieve their goals. But we ended on a hopeful(?) note: maybe that doesn…

    via apenwarr December 2, 2021

    Major errors on this blog (and their corrections)

    Here's a list of errors on this blog that I think were fairly serious. While what I think of as serious is, of course, subjective, I don't think there's any reasonable way to avoid that because, e.g., I make a huge number of typos, so many tha…

    via Posts on November 22, 2021

    Experiences in raising children in shared housing

    Sometimes I see posts about people’s hope to raise children in a group housing situation, and it often seems overly optimistic to me. In particular they seem to expect that there will be more shared childcare than I think should be expected. Today I talke…

    via The whole sky October 18, 2021

    more     (via openring)


  • Posts
  • RSS
  • ◂◂RSS
  • Contact