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How big a solar battery do I need to store all my home's electricity? - Terence Eden (shkspr.mobi)
submitted 1 year ago by to c/technology@lemmy.world
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Neat breakdown with data + some code.

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[–] 7 points 1 year ago (21 children)

they generate about 3,800kWh per year. We also use about 3,800kWh of electricity each year.

Holy shit. I think we used that much last month, which is higher than average but not that high for August around here.

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  • [–] 2 points 1 year ago (15 children)

    glad I'm not the only one that noticed that.

    last time I checked I was using around 4600-5800kwh from May to August. the rest of the year its 3300-4200.

    I live in a dual zoned 5200sqft home and my average power bill is around $900.

    I've had solar sales try to talk me into solar panels but once they see my consumption they stop answering my calls lol. could be because I told them I'll buy once I can get net zero.

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  • [–] 6 points 1 year ago (4 children)

    could be because I told them I’ll buy once I can get net zero.

    I'm not following your logic. You aren't willing to accept any savings unless you can completely zero out your power bill? Judging from your consumption I'm assuming a good chunk of that is for cooling your home? If so that means you're likely in a pretty great place to harvest solar power. You'd reach payback of your investment on your array much faster than most, and be saving money for probably 35 years or more with little to no additional investment.

    Making some guesses for how much your electricity rates are, and how much you're consuming (assuming much from cooling), you might be a full payback in less than 7 years if you took advantage of the tax credit. Then, every month after that you'd be gaining money back.

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  • [–] 3 points 1 year ago (3 children)

    my house is over 120 years old. it still has knob and tube in half the house. I have even found gas lines for the old sconces, that were "conveniently" used as grounds for said knob and tube in some places. the house is a nightmare, electrically speaking. the only new-ish electrical are the HVAC systems, the 200amp panel, and the basement (where the rack lives).

    for me to get proper solar installed, it would cost more than the house cost to buy. For me to find it in any way cost effective, I would need my $900 a month power bill to pay for the $200k loan on top of my mortgage.

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  • [–] 0 points 1 year ago (2 children)

    As someone who electrically renovated houses without beeing an electrician. If you find an electrician who is willing to work with you: do a full planning of the house. (What lines go where etc) ask them to go over this, and pay them for their time. If all goes well this will cost them an evening or three (depending how many flaws they find in your design). Do the wiring and drilling raw sockets yourself. Buy the top sockets wholesale, then have the electrician make a fixed price for installing sockets and wiring your fuse box , it will be much cheaper.

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  • [–] 2 points 1 year ago (1 child)

    appreciate the sound advice. I've rewired plenty of houses that I'm comfortable with DIMS and know most of the NEC.

    the problem is time and effort. I'm getting older and just don't have the drive I used to have 20 years ago. the biggest problem is the house is still mostly original plaster lathe which is a huge pita for running new electrical across four floors. add to that the other litany of projects I have to do plus daily life/work. it's a lot.

    if I was 10 years younger I'd probably start one room at a time, but I'm old enough now that I look forward to taking my daily naps before bedtime.

    I reserved myself to a modest retirement when I bought this house because I knew the risks going in.

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  • [+] 3 points 1 year ago (6 children)
    [deleted]
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  • [–] 3 points 1 year ago (5 children)

    that's an average btw. last months bill was $1100.

    this month is already at $960 and we're only halfway through the month.

    this year has been lower than previous. I had new insulation installed last November.

    highest bill I have ever seen was around $2200 which is over my monthly mortgage.

    no crypto farm. though it would probably be higher if I was.

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  • [–] 3 points 1 year ago (3 children)

    I have personally never seen a bill of more than 60€ per month. I have some friends living in bigger houses, not apartments, and they tell they can get over 100 fairly frequently, the bigger ones more in the North can get over 200 in the winters, but even still, I’ve never even heard of anything reaching 300.

    But I’m in my thirties and don’t really know anyone from beyond upper middle class. That might help explain my experience if it happens to be the outlier, but just reading the responses to this, I might not be the outlier here.

    Anything four figures is just crazy surreal to me. I can not even imagine what it takes to reach that kind of electric usage. Or maybe it’s just extremely expensive, not the usage itself being crazy? I would think living in a place where sustaining one’s existence requires that kind of resource usage would be very hostile against settling and building in general?

    But if it’s just personal usage rather than the regional climate or whatever, and an insane price of electricity isn’t the main reason, then I don’t even know what to say. That’s crazy.

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  • [–] 4 points 1 year ago (2 children)

    it's kind of a mix of everything.

    I grew up poor. like, "take a nap for dinner" poor. I was afforded great opportunities that allowed me to become comfortably wealthy, as in I can freely go to the store and just buy groceries without concern. This is important because I always promised myself that when I grew up I would live comfortably.

    I keep my house between 68F-72F year round. I don't open my windows because I have terrible allergies (that my kids have also inherited). at least half of my bill is just heating and cooling. the other half is likely a mix of the servers and the regular appliances.

    I have family ranging from 30-60 years old. when I told them how much I spend on power their eyes popped out. they don't run their hvacs as much as I do, and actually use their windows and attic fans. they also don't have the allergic reactions I have either so 🤷.

    in my old home, 1600sqft, our highest bill was around $300, and that was still high for the area. our neighbors were average between $100-$150. they were in their 70s though, so likely they didn't use their hvac as much either, nor the technology I was running.

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