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@pmbrandvold@techtoots.com

2026-07-17 18:47 UTC

Okay #DIY and #solar folks. I have a hairbrained idea to re-purpose an old dishwasher circulation pump for a #garden pump to pair with my rainwater catchment system. But I'm a novice when it comes to #electricity and calculating loads. How would I even go about powering the pump once it's removed, and testing it to see how much power it draws so I know what kind of solar panel and battery I'd even need? #solarpunk #gardening #reuse

Replies (3)

  • @tehfishman@ioc.exchange 2026-07-17 19:16

    @pmbrandvold@techtoots.com because it's an appliance, it probably needs 120 volts to run, so this is actually "dangerous if you're a careless idiot" territory. But to assess what you'll need, a simple kill-a-watt power meter is a good place to start. Wire up a plug to the pump, make sure it's plumbed up so it has water to circulate (could just stay in the dishwasher with water for testing), and let it rip. Check for how many amps and watts it pulls. You'll need a battery and a 120 volt inverter that can support that much power draw for as long as you'll need to run it, and a solar panel and charge controller to charge that battery

    Open ##3893065

  • @jpaskaruk@growers.social 2026-07-17 19:53

    @pmbrandvold@techtoots.com I got a drill pump - less than twenty bucks, you get an old drill and hook it up (or anything else that spins about that fast) and it fills up a 3gal container for me in about one minute I'd say. For us, it pumps water out of the barrel (I actually mostly send RO water out to it from our filter system, have not yet gotten the gumption to divert the nearby downspout yet, and feeding our plants nothing but our well water murders them over the season) into containers, to which I can add nutrients and whatnot if need be, or just straight into the watering can. If you're rigging up some sort of autofeed system, the need to press the drill's trigger will make that a nonstarter, but if you just need a way to pump the water out cheaply, drill pumps are the shit.

    Open ##5319871

  • @yessikg@blahaj.zone 2026-07-18 00:26

    @pmbrandvold@techtoots.com To check how much the pump needs, look at the label on it and check if it has the information you need there. Otherwise, you are going to need to find a spec sheet or a technician's guide for it. You will need a model number or a serial number or any other number that identifies it

    Open ##5319872