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12V submersible pump

R

rlp in Co.

Well-known Member
I just got this pump and it looks like it's
ok. It was $80. It pumps about 5 gallons a
minute with no head, so maybe less when
it's down in the well. It comes with about
40 feet of wire which is not a high quality
wire so we'll see how that holds up. I will have to add about 60 more feet of wire just to reach the top of the well. I'm down 75 feet now. I still have about25 feet to go. I
figure it will save me at least a dollar a
day over using a generator to pump water,
and probably a lot more next summer. I only
have solar panel power or a generator. I'm
going to use plastic pipe that comes in a
roll. Does anyone know of a way to get that
stuff straightened out? Sorry for the
sideways picture.
cvphoto41828.jpg
 

Voltage drop over that length especially with 60 extra feet added will be very significant. Try it laid out above ground first , it might need a higher voltage to compensate .
 
5gpm over 100' 12volts
hmmmmm

unroll the hose(pipe) on a warm or hot day in the sun

maybe set the roll a few hours in the hot sun under a clear plastic cover for extra effectiveness
 
Agreed there would be significant voltage drop but also there?s a significant weight of water in the pipe on top of the pump if you?re?say pushing 70? of head on top of the pump. That would depend on your water table depth. Guessing that may be around 30# of pressure to overcome. I suspect that 5 gallon bucket will take very significantly longer to fill with a 30# pressure loss plus a voltage drop.
 
I would test it before I spent a lot on installing it, you need .44 psi per ft of head. Put a gauge and a throttling valve on it and test it. If the water table is down 80 ft you need about 35 psi just to get it to the surface. Did any information come with it, a pump curve chart? You could maybe find something online.
 
personally I think that pump going be disappointment, you need to know the head pressures etc at least. pipe for going down the hole use heavy pvc pipe there the coil for everything else it makes lot easier to pull also. I just did this couple months ago all new well guts. good luck
 
I have a couple of those. They are good for 100 psi max. 12-24 volts. I run mine with 2 100 watt solar panels in series. 24 volts.
 
My pump is hanging on that black plastic pipe and has been for decades. Get the pipe warm and it will unroll with no problem. Warm as in say what it would be in your house
 

In order to reduce voltage drop and friction loss you want to go big with both wire and pipe.
 
Test first, put it in a 5 gallon bucket with a hose and pressure gauge and a shut off valve in line, then return the flow to the bucket. Run it and close the valve until the needed pressure is reached to lift the well water depth. If it will produce a 2 or 3 gallon flow, good. But remember the flow will then not make pressure for use! 30psi on top of lift pressure is unlikely. I lived with a pump at 475 feet it had 8 impellers and 2 hp at 220 volts and 10 gauge wire. It made 5gpm and no additional pressure. Jim
 
Thanks for the comments. This new green plastic pipe seems to be thicker than the old black pipe. Home Depot didn't even have the black pipe. Anyway it is much more difficult to unroll. I was hoping that someone had a way to straighten it out. I wonder if I stretched it between my pickup and tractor?
I did test the pump yesterday in a barrel of water and it came close to 5 gallons in 60 seconds. It pulled 10 amps of current. I'm thinking it will pull less current under pressure. I'm still drilling and I am about 75 feet deep. I hit water at this depth and the water came up about 20 feet in the well. I pumped it with a air pump and I can pump about 30 gallons before it pumps dry. Then it slowly fills back at about a quart per hour. The air pump worked but it is very inefficient, that's why I bought the 12V pump. I'm going to drill more today and see if I can get it down deeper. My neighbor's well is a 100 feet deep but I might be at a little higher elevation than he is. This well has been very difficult to drill. I hit what I think was sandstone at about 6 feet deep. I was only able to make about a foot per day. I have been at this for a while, ha ha, working off and on when I have time. I know, you rich guys will say, just hire a well driller.
 
instead of the plastic pipe in a roll, why not use 1 inch schedule 80 pvc well pipe? it comes prethreaded . i justhad my submersigle pump replaced after20 years and the pipe is still fine.
 
I might have to price that pipe. I would have to make something to hold the pipe while I put on the next piece.
 
It's just a homemade rig with a 3 HP posthole digger. I wish I had a bigger augur. This turns too fast and not enough power. Maybe I'll take a picture of it next time I use it. I couldn't drill today because of the wind. Wrestling a 20 foot pipe up in the wind is a little bit difficult. It's raining now so I wonder if I might have to wait till spring to finish.
 
Sounds like you have the 24V model. Mine is designed for 12V. Probably almost the same except for more or less windings in the motor. Yours might provide more power. Do you have a controller on yours, or is the controler built into the pump?
 
Both pumps are advertised as 12 or 24 volts. One looks just like yours. No controller needed, connected directly to solar panels.
 
How can that be? Is there a controller inside of the pump? Or maybe low voltage doesn't hurt the pump and it just heats the water until there is enough voltage to turn the motor? I will have to test that out and see what the pump does with a low voltage. I know that it is a permanent magnet motor. I wonder if it has brushes in it?
 
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