Short answerSmall DC submersibles rated around 230 to 270 ft of maximum head work comfortably to roughly 120 to 180 ft of total dynamic head; deeper wells need a higher-voltage pump. Every foot of lift costs the same energy, so panel watts rise in a straight line with depth.
Affiliate links on this page. We may earn a commission if you buy through them, at no extra cost to you. That doesn't change what we recommend. How we make money.
Key takeaways
- Energy rises in a straight line with depth: 0.00314 Wh per gallon per foot before losses.
- Keep total dynamic head to half or two thirds of a pump's maximum head.
- Safety rope, torque arrestor and a check valve matter more the deeper the pump.
Safety. Panels and batteries can deliver dangerous current. Follow NEC Article 690 and local code, and use a licensed electrician or well contractor where your state requires one.
Depth costs energy in a straight line
Lifting a gallon one foot takes 0.00314 watt-hours. Lifting 500 gallons 300 ft takes 471 Wh of pure water work; at 35% wire-to-water efficiency that is about 1,350 Wh of electricity a day. In a month with 4 sun hours that is roughly 340 W at the pump's input, or about 450 W of panel nameplate after losses. Halve the depth and you halve the energy.
Where the small DC pumps stop
The 12V, 24V and 48V submersibles we list are rated by VEVOR at 230 to 273 ft of maximum head. That is the zero-flow shut-off figure. To deliver useful water you want your total dynamic head well below it: around half to two thirds of the maximum is a comfortable working range. Past about 200 ft of TDH, look at higher-voltage helical rotor pumps and ask for their curves at your head.
VEVOR 12V DC 120W submersible deep well pump
Low-volume wells: a cabin, a garden or a few head of stock. The deepest submersion rating of the three.
- Voltage
- 12V DC (12 to 14.8V)
- Rated power
- 120 W
- Max flow (zero head)
- 3.2 gpm
- Max head (zero flow)
- 230 ft
- Max submersion
- 98.4 ft
- Outlet
- 1/2 in
- In the box
- Pump only: no panel, controller or pipe
VEVOR 24V DC 277W submersible deep well pump
Stock water and small irrigation where the water level is within about 100 ft.
- Voltage
- 24 to 42V DC (36V rated)
- Rated power
- 277 W
- Max flow (zero head)
- 9.25 gpm
- Rated point
- 5.28 gpm at 84 ft
- Max head (zero flow)
- 272 ft
- Max submersion
- 65.6 ft
- Outlet / cable
- 1 in / 33 ft
- In the box
- Pump only
VEVOR 48V DC 369W submersible deep well pump
Deeper lifts at modest flow. Wants two 36V-class panels in series to reach its voltage.
- Voltage
- 48 to 82V DC (72V rated)
- Rated power
- 369 W
- Max flow (zero head)
- 8.4 gpm
- Rated point
- 1.77 gpm at 167 ft
- Max head (zero flow)
- 273 ft
- Max submersion
- 65.6 ft
- Outlet / cable
- 1 in / 33 ft
- In the box
- Pump only
We have not tested these products; specifications are the merchant's own. Affiliate disclosure.
Submersion depth and setting depth
Submersion rating is how far below the water surface the pump can sit, not how far it can lift. The VEVOR 12V pump is rated to 98.4 ft of submersion and the 24V and 48V models to 65.6 ft. Set the pump far enough below the pumping level that drawdown never uncovers it, but keep it at least several feet off the bottom of the well to stay out of sediment.
Well yield
A deep well with a low yield is a good match for solar: a pump making 2 gpm all day asks far less of the aquifer than an AC pump making 10 gpm in bursts. If the driller's log gives a yield below your solar flow rate, add a low-water cut-off so the pump stops before it runs dry.
Hardware that matters more at depth
- Safety rope of stainless or UV-stable poly, tied off at the wellhead, so the pump can be recovered if the pipe parts.
- Torque arrestor to keep the pump from twisting the drop pipe on start-up.
- Check valve at or just above the pump, so the column of water does not drain back each night.
- Submersible-rated drop cable sized for the run: voltage drop on a long 12V cable is severe, which is a practical reason to choose a higher-voltage pump for deep wells.
- Well cap that seals the casing against insects and surface water.
Three DC well pumps side by side on the merchant's own figures, plus panels, controllers and batteries.