Comments on: Pumping water with batteries

Question: Pumping water with batteries

kamelhoecker — Thu, 02 Jul 2009 07:45:22 -0800

Small pump. For liquids. Battery powered. Inexpensive. Does such a thing exist?

I've been searching for pumps and haven't found much available. I've found several pumps for garden fountains, that are basically a small paddlewheel on a fast motor that flicks water. Far too inefficient for battery power.

I've found homebrewers making their own peristaltic pumps which could be shunk down.

Any other simple homemade pump designs or sources for cheap pumps?

By: cabingirl

cabingirl — Thu, 02 Jul 2009 07:53:07 -0800

Can you elaborate on what you want to use the pump for and the conditions it needs to meet? Also, what kind of battery are you thinking of? I mean, this pump is designed to use a car battery, but somehow I don't think that's what you are looking for.

By: Frasermoo

Frasermoo — Thu, 02 Jul 2009 07:57:18 -0800

you could buy a replacement pump for a zodi?

By: jangie

jangie — Thu, 02 Jul 2009 08:00:45 -0800

Would a fish-tank pump be workable?

By: kamelhoecker

kamelhoecker — Thu, 02 Jul 2009 08:02:59 -0800

I have few uses in mind: Pumping liquid out of a worm compost bin. Or pumping small amounts of water (100mL) to plants. Yes, small batteries to run a small 3-9V motor (500mA max). (I'll probably use a wall wart to power the pump initially, but would like the possibility of moving to batteries.)

By: AzraelBrown

AzraelBrown — Thu, 02 Jul 2009 08:06:28 -0800

Desktop fountains all have tiny battery-powered or low-votage pumps in them.

By: brain

brain — Thu, 02 Jul 2009 08:07:55 -0800

What about a 12V oil change pump? You can easily build a small 12V supply from 8 AA batteries and 2 4xAA battery holders that you can get at Radio Shack.

By: exogenous

exogenous — Thu, 02 Jul 2009 08:09:41 -0800

Here's a 6V pump intended for solar power.

By: jon1270

jon1270 — Thu, 02 Jul 2009 08:30:15 -0800

For the worm composter, you're probably better off with a drain arrangement and letting gravity do the work. If you have a lot of plants to water, drip irrigation might be appropriate.

By: rr

rr — Thu, 02 Jul 2009 08:41:48 -0800

Don't most boating supply stores sell small, 12V pumps?

By: electroboy

electroboy — Thu, 02 Jul 2009 08:59:36 -0800

If you're thinking about a drip irrigation system, you can use your house's water pressure to move the water, rather than a pump. If you're working from a rain barrel, you could elevate the barrel and let it flow by gravity.

By: weapons-grade pandemonium

weapons-grade pandemonium — Thu, 02 Jul 2009 09:23:13 -0800

It's much quicker finding stuff like this by searching Google Images, rather than Google Web.

By: mbatch

mbatch — Thu, 02 Jul 2009 09:23:36 -0800

Seconding boat bilge pumps. You should be able to pick up a pump that runs off battery power and can do 200 gph or more for ~$15.. you can get a simple plastic float, too, that will activate/deactivate the pump as the float rises or lowers but it is unclear from your description if a float would work in your situation.

By: hortense

hortense — Thu, 02 Jul 2009 09:28:52 -0800

Windshield washer pumps, via surplus.

By: dreadpiratesully

dreadpiratesully — Thu, 02 Jul 2009 09:30:49 -0800

How small? There exist battery-operated pumps for filling kerosene heaters.

By: sebastienbailard

sebastienbailard — Thu, 02 Jul 2009 12:23:12 -0800

American Science and Surplus - pumps (battery powered and otherwise)

By: gjc

gjc — Thu, 02 Jul 2009 15:02:20 -0800

Windshield washer pump, alligator clips and a battery?

By: kamelhoecker

kamelhoecker — Fri, 03 Jul 2009 06:38:25 -0800

Thanks for the responses. jon1274: I know gravity can sometimes do the job of a pump, but i really wanted to play with a pump.

exogenous: That solar pump looks basically like the paddlewheel design that just splashes water in a particular direction. That design seems crazy inefficient to me, but i guess the idea is that you only want a bit of water gurgling for a tabletop fountain and don't actually want it to be shooting water high into the air.

jangie: Good idea. The aquariums I had as a kid just had bubblers, but it makes sense that fancy systems need actual pumps. Combined with weapons-grade pandemonium's suggestion of using google images I discovered that there is a whole scene of people using aquarium pumps to water-cool their overclocked computers.

The windshield washer pumps are a good idea. As is the kerosene, hot-water shower pump (no idea that existed!) boat bilge and oil-change pump. (And there are probably also some inexpensive pumps for siphoning gas.) I'll see what's available and affordable.

I managed to find a small diaphram pump in an electronics surplus store. Combined with a small motor, it was only $7 so i'm going to see how that works before moving up to anything fancier.