I’m tired of buying a new 12 V battery every 1-2 years. I have about 4 small (rated ~ 300 W [not VA]) UPSes with 7 Ah, 12 V, maintenance free batteries.

I’m thinking about replacing them with one, powerful unit. But the more powerful the unit, the more it costs - non-linear.

Do you have experience with some DIY solutions? Like 12V DC to 230V AC inverter, battery charger, some UPS controller (simple relay?)?

Or maybe you have some other idea that is cheap(ish)?

  • carl_dungeon@lemmy.worldEnglish
    17·
    1 year ago

    I have a few cyber power 1000W/1500 VA units. They go on sale for under $150 now and then. Best price/power ratio I’ve found. The battery in one has lasted at least 6 years, other is going strong for at least 2. They’re big enough to power my 8 bay NAS for a couple hours. I don’t recommend DYI for a UPS, too unreliable.

  • dsmk@lemmy.zipEnglish
    15·
    1 year ago

    I don’t have anything to add in terms of solutions, but I think it’s worth trying to understand why your batteries only last 1 or 2 years.

    If it’s because they’re too low capacity for your needs and you’re deep draining discharging them often, then you might be able to save money in the long term by getting a larger, more expensive UPS. If the environment where they operate is harsh (eg: too hot), maybe the fix is actually air con or something like that. And so on.

    Batteries can last a long time, but you need to avoid the extremes: temperatures, state of charge, charging cycles, etc.

      • dsmk@lemmy.zipEnglish
        5·
        1 year ago

        No. For most (if not all) batteries the recommendation is to avoid discharging them too much.

        Having a larger battery helps here because you won’t go as deep. On a larger UPS, maybe you’ll be at 30% when the power returns instead of being at 5%. On a phone, it may reduce the number of charging cycles because you no longer need to charge during the day or have to go too deep. On EVs, a larger battery means that you won’t have to fast charge as much during trips and that you won’t have to charge it to 90% to reach the next charger or arrive with a very low state of charge.

        Larger batteries also allow devices to age better. If I get a phone that barely lasts me a day, I’ll probably have to replace the battery or carry a power bank around after a while. On the other hand, if I always end the day with 20-30% left, I’ll only have problems after losing ~20% of capacity. It’s the same with a UPS. If we find ourselves going down to 5% when it’s new, then 2 or 3 years later that USP won’t be enough for our load/outages and will shutdown before power returns.

        • giant_smeeg@feddit.ukEnglish
          1·
          1 year ago

          Yeah that’s good then.

          I get about 60m runtime on my setup and it only cycles 10-20% max.

          Already had to change the battery early and wondered if that was why.

  • ares35@kbin.social
    151·
    1 year ago

    if you’re running batteries down often enough to need battery replacements that frequently, you may be going ‘too cheap’ (poor quality and/or not enough capacity) to begin with, and would need an upgrade not another ‘cheap’ solution.

    • lnxtx@feddit.nlOPEnglish
      11·
      1 year ago

      Maybe this is a combination of cheap battery and temperature. I feel the chassis is a bit warm.

      Mains is very stable here, only very short breaks like fractions of a second. So no deep cycle.

      Thanks!

    • REdOG@lemmy.worldEnglish
      4·
      1 year ago

      If you have three phase power and lose power on one then batteries come in handy. Otherwise a nice generator helps. But OP will just be trading swapping one battery for a tray of batteries instead.

    • TheWiseAlaundo@lemmy.whynotdrs.orgEnglish
      1·
      1 year ago

      Man. That AIMS low frequency inverter is nice.

      I actually bought one of those cheaper Chinese pure sine wave inverters, but found that they don’t run motors/power tools that well. The surge current demand just exceeds anything they can provide. They’re great for resistive loads like PCs/LEDs/Hotplates, but if you wanted to run a table saw or something the AIMS is the only way.

      • HTTP_404_NotFound@lemmyonline.comEnglish
        2·
        1 year ago

        Cheaper or not, isn’t a huge factor.

        My really expensive sol-ark 12k cannot start my 110v air-compressor.

        The issue is, the rated L.R.A. ie, locked rotor amps, how much current it takes to get it started.

        My A/C motor, for example, uses around 20 amps @ 240v when running, ie ~5,000w. However, its L.R.A, is 112.0 amps @ 220v, ie- (24,640 watts). Which is more than the peak load my 12k inverter can handle. So- if you tried to start it on the inverter, well, it doesn’t work.

        https://static.xtremeownage.com/blog/2023/off-grid-ac/

        The same principle applies to anything with a motor.

        You have to evaluate the L.R.A. Remember, if you have say, a 5,000watt RMS inverter, which can handle a 10k peak- its not going to be able to start something that has a 14,000 startup draw.

  • OmltCat@lemmy.worldEnglish
    6·
    1 year ago

    It’s 12V so I guess you can Frankenstein something with a car battery. But honestly this sounds more like a LTT video than something I would trust not to burn my house down.

    • QuinceDaPence@kbin.social
      2·
      1 year ago

      You’d want to use a deep cycle (sometimes labeled “marine”) battery, not a car battery. Car batteries can put out a shit ton of power for a very short time but their total capacity is pretty low.

      Also you still want AGM, Gel or something else sealed like that. You don’t want a Flooded Lead Acid battery charging/being trickle charged inside your house.

      Op could also swap to LiFePO4

  • Awwab@kbin.social
    5·
    1 year ago

    I doubt there is a much better solution, the huge rack mounted UPS are just tons of 12v batteries wired together. I would question why your batteries are dieing so frequently, I expect to get 5+ years out of mine with light use.

  • MangoPenguin@lemmy.blahaj.zoneEnglish
    4·
    1 year ago

    I wonder why they’re only lasting 1-2 years. How often do they kick in in your area?

    DIY is going to be more expensive, and much less safe.

  • MNByChoice@midwest.socialEnglish
    41·
    1 year ago

    Others have given the direct answer of “no”. Cheap is relative, so here are some options that assume a higher value of “cheap”.

    DIY solar panels and DIY flywheel generator.

    Professional solar panels on your dwelling and professional whole house battery storage. (Fix the issue by fixing a larger issue.)

    Buy an electric car that can power the equipment. A Ford Lightning (there are other choices) in the garage, that never moves, will solve the issue of swapping batteries. Check junkyards for a used one.

    Move closer to a power plant, while also ensuring a minimum power line distance.

    Move closer to something with a very high up time requirement. (A hospital may have generators, but they may also have a requirement for their power to stay up nearly always.)

    Use AWS or co-hosting to make power not your issue.

  • Mugmoor@lemmy.dbzer0.comEnglish
    2·
    1 year ago

    I’ve had my APC 1000-UPS for 5 year and have only had to replace the battery once, though I think I may need to again by the end of the year.