System is 24 VDC and desired well pump requires 30-300 VDC. What to do?

[Silver_Is_Money]

I'm looking for a well pump for a 139 foot deep well that I can run off of 24 VDC. It will need enough head to lift 139 feet and subsequently pressurize my expansion tank to 40 PSI. I came across a well known manufacturers submersible helical rotor pump which (to my dismay) states that it needs 30-300 VDC to operate. Is this pump off limits to my 24 VDC system, or is there a means whereby to operate it off of my 24 VDC system?

[cjb80]

Potential answers in order from most simple to least simple:

1) Find another pump.
2) My guess is that the pump that you have apparently selected is designed for panel direct. This is a cheaper solution because it does not require batteries. The only issue is that it requires sunlight to pump. So you could pump to a tank and then use a smaller pump with your 24V DC system to pump from the tank. This would mean that you'd effectively have two different solar systems; there's nothing wrong with that in my opinion.
3) Change your solar system to use 48V or higher; this will require new batteries and a new charge controller - potentially.
4) Figure out some voltage boosting circuit to get from 24V to something higher. I would guess that your battery current will increase dramatically and fry the batteries. You'll need to figure that one out too.

Chris

[Mike90250]

See is there is a wattage spec along with the voltage spec for that pump. 32V @ .5A is not going to do much.

Price out a pair of Grid Tie style panels - 50V range 200 - 250 watts ea. That would give you 400w at about 100V to pump daytimes with. Add a couple pressure tanks, and you would have water at night too

Give us a mfg's model or link to the pump, others may find it useful too.

[Silver_Is_Money]

It is the Grundfos 6 SQF-2. Obviously not the pump I need, though its pump curve parameters seem to meet the criteria. Is there a submersible well pump that will run of of my 24 VDC battery bank, preferably without having to go through the inverter?

[cjb80]

Oh, well then the most simple answer (call it, #0.5 on my previous list) is to go get an inverter and call it a day. The Gundfos pumps that run on A/C power cost about 25% of the ones that run off of solar and A/C; which will pay for an inverter and give you a few bucks left over.

[Wy_White_Wolf]

Shurflo 9300 series have a 24v pump. It is a diaphragm type pump so I would not run it with a pressure tank. I do have one in my well that is ran solar direct to feed a cistern. The cistern then gravity feeds to the orchard through a timer. Could you redesign your system to feed a cistern then a second pump to pressurize the tank?

WWW

[Mike90250]

Oh, well then the most simple answer (call it, #0.5 on my previous list) is to go get an inverter and call it a day. The Gundfos pumps that run on A/C power cost about 25% of the ones that run off of solar and A/C; which will pay for an inverter and give you a few bucks left over.

That's what I eventually decided to do in my case, any water guy can get me a new pump installed in 2 days for a couple hundred bucks. Being 400' from the power shed, and new to my property and unknown lightning hazards, the expensive solar pump was not for me. And a couple times in the winter, I had to pump from generator power.

[Sunking]

How much wind do you get, and suburban? Ever thought about an ole fashion Windmill?

[Texas Wellman]

Have you ever priced a windmill and then figured in the maintenance costs?

Run the grundfos on 2 grundfos panels in series that operate at 70V each. Problem solved.

How much wind do you get, and suburban? Ever thought about an ole fashion Windmill?