Hey everyone, it’s Jake from the submersible pump team here. Over the past 7 years, I’ve talked to way too many homeowners, small farm operators, and even off-grid cabin owners who’re stoked about solar-powered water systems—but they’re totally lost when it comes to installing a submersible pump. Like, I get it! Solar stuff has that “DIY cool” vibe, but mix it with a deep well and a pump, and suddenly it feels like trying to assemble IKEA furniture without the instructions. No judgment here— I’ve been there. Last month, a guy reached out to me panicking because he’d bought a random sub pump online and spent 3 days trying to lower it down his 120ft well, only to realize he’d ordered a 120V pump that didn’t match his 24V solar setup. Oof. That’s exactly why I’m putting this together today: real, step-by-step, no-fluff guide to getting your submersible pump installed right in your solar system, plus a few pro tips I’ve picked up fixing mistakes like that over the years. Submersible Pump
First, let’s start with the stuff you need to know before you even buy a pump. Wait—this isn’t a “once you unbox it” guide, right? If you skip the prep, you’re gonna waste time and money, maybe even ruin a pump. Let’s get the non-negotiables down. First: what’s your well’s spec? You need two numbers here: static water level (that’s how far down the water sits in the well when no one’s using it) and drawdown level (the lowest it drops when the pump’s running). Pro move: don’t guess—rent a water level meter for like $20 at most hardware stores, or call your local well driller to check. For example, if your static level is 80ft and drawdown hits 95ft, your pump has to be fully submersible at least 10ft below that drawdown—so at like 105ft deep. If you don’t, you’ll get air in the pump, it’ll run dry, and that’s a one-way ticket to pump death.
Next, your solar system specs. This is the part where I see 90% of people mess up. Your submersible pump’s voltage has to match your solar array. Most small off-grid solar setups are 24V or 48V—rarely 12V, because 12V pumps are too weak for deep wells. If you have a 24V array, buy a 24V sub pump; 48V array? 48V pump. Don’t try to wire a 12V pump to a 24V system with resistors— that’s inefficient and dangerous. Also, check the pump’s flow rate: if you’re just watering a tiny garden, 5 gallons per minute (GPM) is fine; if you’re filling a whole house plus a sprinkler system, you need 10-15 GPM. And make sure your solar controller can handle the pump’s starting current—submersible pumps have a “surge current” when they turn on that’s 2-3x their running current. If your controller can’t handle that, the pump will just click on and off all day, no water. Ask me how I know—another customer last year bought a cheap controller that couldn’t handle the surge on their 24V 10GPM pump, and it fried the controller in 2 weeks. Oops.
Okay, now that you’ve got the right pump (and trust me, don’t buy cheap off-brand pumps—they skip the corrosion protection, and if you have hard well water, they’ll seize up in a year. Our pumps are all 304 stainless steel, so that’s one less thing to stress about), let’s get to the actual install. I’m gonna break this down into 7 steps, no jargon, I promise.
Step 1: Prep Your Well & Your Tools. First, turn off all power to the solar system—this is non-negotiable. Don’t skip this step. Even if you think the system’s off, there might be residual power. Grab your tools: a pair of heavy work gloves (the well casing is sharp, trust me), a pipe wrench, a tape measure, a marker, a drill with a hole saw (for the well cap), Teflon tape, a level, and a helper. You’ll need at least one extra pair of hands here—lowering a sub pump + 100ft of pipe is heavy, and you don’t want it going sideways in the well. Oh, and if your well doesn’t have a existing well cap, get a new PVC or stainless steel cap before you start—this keeps dirt, bugs, and critters out of your well, which is a health hazard.
Step 2: Assemble The Pump & Pipe. Wait, don’t do this at the wellhead where you’re tripping over stuff. Do this on a flat, clear spot next to your well. First, attach the pump to the first section of riser pipe (the pipe that carries water up from the well). Important: always use plastic riser pipe, not metal. Metal pipe is heavy, corrodes, and if it breaks, it’s a nightmare to fish out of the well. Our sub pumps come with a guide clamp that fits on the riser pipe—use that, it keeps the pump straight so it doesn’t hit the well casing walls. Next, run the pump’s power cable along the riser pipe—secure it every 2ft with zip ties, but leave a little slack at every pipe joint. Why? If you ever need to pull the pump back out for maintenance, you don’t want to yank the cable. Also, when you connect each pipe joint, wrap the threads with Teflon tape clockwise (so when you tighten the joint, the tape doesn’t bunch up) and make it snug—over-tightening cracks PVC, and that’s a leak waiting to happen.
Step 3: Calculate The Exact Depth To Lower The Pump. This is where that well level measurement you did earlier comes in. Remember the drawdown level? You need to lower the pump 10ft below that, so take your drawdown number, add 10ft, and that’s your target depth. For example, if drawdown is 95ft, target is 105ft. Now, tie a strong nylon rope (not twine, not anything weak) to the top of the riser pipe—tie it on tight, and mark the spot where the rope meets the well edge. That’s how you’ll know when you hit the right depth. Also, make sure the pump is oriented correctly? Wait, most sub pumps for residential use are self-priming, so they don’t have an orientation, but double-check your pump’s manual—some older models need the impeller facing a certain way. Our pumps all have a little arrow on the motor that points up, so make sure that’s facing the top of the well, not down.
Step 4: Lower The Pump Slowly Into The Well. Okay, helper time! One of you should hold the rope and riser pipe, the other can feed the pipe down carefully. Go slow—don’t just drop it. If it hits the casing, you can crack the pump’s motor or scratch the pipe, which will lead to leaks. Every 10ft, stop and check the rope mark to make sure you’re not going too far or too short. When you get close to that 105ft target, go extra slow—you don’t want to bump the pump on the well bottom. Once you hit the mark, tie the rope securely to the well casing or a sturdy anchor point at the wellhead—you don’t want this thing slipping down 5 more feet when you’re done.
Step 5: Run The Water Line & Power Line To The Wellhead. Now, you need to run the pipe from the top of the riser up to your solar system’s pressure tank (that’s the big tank in your garage or shed that stores water) and the power line from the pump to the solar controller. First, use a flexible water line connector between the riser pipe and the hard pipe going to the pressure tank. Why? If the ground shifts a little, or if the pump vibrates, that flex connector will prevent leaks. Again, wrap pipe threads with Teflon tape—don’t skip this, I’ve seen guys skip Teflon and have a leak that wasted 50 gallons of water in a week. For the power line: run it through a conduit if it’s exposed, to protect it from sun and critters. Connect the power line to the solar controller, making sure you match the positive and negative terminals—most controllers have labels, but if you mix them up, the pump will just hum, not run. Ask me how I know—yep, another customer did that last year, spent an hour troubleshooting before he realized he flipped the wires.
Step 6: Seal The Well Cap & Test For Leaks. This is a big one. You can’t just have pipe and wires sticking out of the well casing. Get your well cap with a watertight seal, drill a hole for the water line and power line, and use silicone caulk or a rubber gasket to seal around them. This keeps rodents, rain, and dirt out—super important for well water quality. Once that’s sealed, turn on the power to the solar system, and wait for the pump to kick on. It should run smoothly, no weird grinding sounds, and water should start flowing from your faucet within 10 seconds. Now, check all the pipe joints for leaks—run your hand along every connection, if you feel water, shut off the power and tighten that joint a little more. Don’t overdo it, though—PVC cracks easily. Also, check the pressure tank to make sure it’s building pressure correctly. If the pump runs non-stop and the pressure tank never hits the cut-off pressure (usually 40-60 PSI for residential), you might have a leak in the pipe or a faulty pressure switch.
Step 7: Do A Long-Run Test & Add A Overflow Safety. Wait, don’t call it done after 5 minutes. Let the pump run for 30 minutes straight, then check everything again—no leaks, no weird noises, pressure stays steady. If everything works, add an overflow safety switch to your system. This is a small device that cuts power to the pump if the pressure gets too high, or if the water level in the well drops too low (so the pump doesn’t run dry). It’s like an insurance policy for your pump—way cheaper than buying a whole new pump if you forget to check your well level during a drought. We sell these as part of our pump kits, they’re super easy to install.
Now, a few pro tips from 7 years of messing up (and fixing other people’s messes) that’ll save you a ton of headache. First: don’t ever run your sub pump dry. Even for 10 seconds. Sub pumps are cooled by the water they’re submerged in—run them in open air, and the motor will overheat and seize up in minutes. That’s the #1 reason people call me with broken pumps. Second: if you live in an area with hard well water, add a water softener or a sediment filter before the pump. Hard water builds up mineral scale on the pump’s impeller, which slows it down and reduces flow over time. Third: every year, pull the pump up and inspect it. Check for sediment buildup, check the power line for damage, tighten any loose joints. It takes 20 minutes, and it’ll make your pump last 2-3x longer. Our pumps are built to last, but even the best pump needs a little TLC.
Wait, I know some of you are thinking: “I don’t wanna do this myself, can someone help?” Or maybe you ran into a problem halfway through. If that’s you, just reach out—we’re not just a submersible pump supplier, we help with installs too, or can connect you with local certified technicians who specialize in solar water systems. No pushy sales stuff, no hidden fees—just honest advice because we’ve been in this game long enough to know how frustrating it is when your water system breaks on a Tuesday morning, right when you need it most.
Don’t get me wrong, installing a submersible pump in a solar system isn’t rocket science, but it’s not like hanging a picture frame either. Skip the cheap mistakes, do the prep, take your time, and you’ll have a reliable water system that works for years. If you have questions, feel free to shoot us a message—we’re here to help.
Submersible Pump References:
- Solar Power World. (2022). “Residential Solar-Powered Pump Systems: Installation Best Practices”
- National Ground Water Association. (2021). “Submersible Pump Installation Guidelines for Domestic Wells”
- Submersible Pump Manufacturers Association. (2023). “Specifications for Matching Pumps to Solar Array Systems”
- Off-Grid Living Magazine. (2022). “DIY Installation Tips for Small Solar Water Systems”
Hunan Sanchang Pump Co., Ltd.
Hunan Sanchang Pump Co., Ltd. is one of the most reliable submersible pump manufacturers and suppliers in China, also supports customized service and OEM&ODM service. Welcome to buy CE certified submersible pump made in China here and get pricelist from our factory. For price consultation, contact us.
Address: No.517, Xiangfu East Road, Yuhua District, Changsha City Hunan
E-mail: info@sanchangpump.net
WebSite: https://www.sanchangpump.net/
