The short answer: a solar generator can run a well pump, but only if it matches the pump’s voltage and can cover its startup surge. A submersible pump (240V, 3,000W to 7,200W at startup) needs a split-phase system such as the Anker SOLIX F3800 Plus. A small 120V jet pump can run on a 120V unit. Check your breaker first: a double breaker means 240V.
If you’re on a well, an outage isn’t just dark: it’s no water. No taps, no shower, no flushing toilets, and if you have livestock, no trough. That’s why well owners tend to buy backup power sooner than anyone else, and it’s also why they’re the most likely to buy the wrong thing.
The trap is simple. Most of the big, well-reviewed, heavily marketed power stations are 120V only. A residential submersible well pump is 240V. It doesn’t matter how many watt-hours the battery holds; the voltage is wrong and the pump will not run. People find this out after the purchase.
The two specs that decide it
1. Split-phase 240V. Non-negotiable for a submersible pump, which is wired for it. This single requirement eliminates most of the market.
2. Surge headroom. A pump motor draws far more current in the instant it starts than it does while running: commonly three to six times its running wattage. Size to the surge, not the average:
| Pump | Typical running watts | Plan for startup surge |
|---|---|---|
| 1/2 HP | ~750W | ~2,300–4,500W |
| 3/4 HP | ~1,000W | ~3,000–6,000W |
| 1 HP | ~1,200W | ~3,600–7,200W |
| 1.5 HP | ~1,800W | ~5,400W and up |
Find your pump’s plate: it lists horsepower and often locked-rotor amps, which is the surge figure. If it’s inaccessible down the well, the pressure tank or the breaker size will tell you roughly what you’re dealing with. A soft starter, if your pump has one, cuts that surge substantially.
What actually runs one
| System | Why it works | Price | Retailer link |
|---|---|---|---|
| Anker SOLIX F3800 Plus (lowest price here) | Split-phase 120V/240V, expandable. The lowest-priced system here with the voltage a pump needs. | $3,499.99 | Check the price |
| EcoFlow DELTA Pro Ultra Smart Home Kit | 7,200W output and 6,144Wh: the most surge headroom here, for a 1.5 HP pump or a pump plus heavy loads. | $7,769.00 | Check the price |
| EcoFlow DELTA Pro Ultra Deluxe | Same platform, more storage and solar: for long outages where the pump runs daily for a week. | $12,879.00 | Check the price |
Prices as listed at the time of writing.
How much battery a week of water takes
Running the pump costs less than people fear. A household using around 150 gallons a day typically runs the pump 30 to 60 minutes total, spread across the day: call it 0.5 to 1kWh. Even at the high end, a 6,144Wh system carries roughly six days of pumping if that were all it did.
It won’t be. Add the fridge, the freezer, the lights, and Wi-Fi and you’re realistically at a day to a day and a half per charge. That’s why solar input matters more here than anywhere: the DELTA Pro Ultra accepts up to 5.6kW of panel, enough to refill in a strong day and keep the water flowing indefinitely. Our panel comparison covers what that actually costs.
DELTA Pro Ultra Smart Home Kit at Outbound Power ($7,769.00 at time of writing)
Quick match: pump size to system
| Your pump | Voltage | Startup you need to cover | What fits |
|---|---|---|---|
| 1/3 to 1/2 HP shallow or jet pump | 120V | about 1,500W to 3,000W | A 120V unit with 3,600W output, such as the Jackery HomePower 3600 Plus |
| 1/2 HP submersible | 240V | about 2,300W to 4,500W | Split-phase system, such as the Anker SOLIX F3800 Plus |
| 3/4 to 1 HP submersible | 240V | about 3,000W to 7,200W | Anker SOLIX F3800 Plus, or the DELTA Pro Ultra for the top of that range |
| 1.5 HP submersible | 240V | about 5,400W and up | EcoFlow DELTA Pro Ultra (7,200W) |
These are typical figures. The pump’s nameplate gives the real horsepower and amps, and a pump with a soft starter needs far less surge. If your number sits near the edge of a unit’s rating, pick the bigger one.
The wiring is not optional
A submersible pump is hard-wired to your panel. There’s no plug to move. Connecting backup power means a transfer switch or smart panel, installed by a licensed electrician and permitted in most places. Get that quote before you choose a system: it can be a four-figure line item and it may change which unit makes sense.
One warning worth stating bluntly: never backfeed a circuit through a dryer outlet or a homemade cord. It can energize the utility line outside and kill a lineman working to restore your power. It also destroys equipment and voids insurance. Transfer switch, every time.
Two low-cost things that stretch any system
- A pressure tank that’s correctly charged means the pump cycles less, which cuts both surges and runtime. Check the air charge against the cut-in pressure.
- Store water before the storm. Filling the bath and a few jugs costs nothing and takes a day’s demand off the battery entirely. Backup power is for when that runs out.
First, find out what pump you actually have
Everything above assumes a submersible pump, which is what most homes with a drilled well use. Not every well is like that, and the difference changes what you need to buy.
| Type of pump | Where it sits | Usual voltage | What runs it |
|---|---|---|---|
| Submersible | Down the well, on a pipe | 240V | A split-phase 120V/240V system, wired in |
| Deep-well jet | Above ground, with a line down the well | 120V or 240V | Depends on the label |
| Shallow-well jet or shallow-well booster | Above ground, in a basement or well house | Often 120V | A 120V unit may be enough |
The quickest way to tell is at the breaker panel. A pump on a double breaker (two switches joined together) is on 240V. A pump on a single breaker is on 120V. The nameplate on the pump or the control box gives you the horsepower and the voltage; write both down before you shop.
If yours turns out to be a small 120V pump, you have more choice. A unit like the Jackery HomePower 3600 Plus (3,584Wh, 3,600W) has plenty of output for a half-horsepower jet pump, and costs well under the 240V systems. Check the pump’s startup surge against the unit’s surge rating first: the surge is the number that trips a system that looks big enough on paper.
What a day of water really costs in battery
Well owners tend to guess this badly, in both directions. Here is the water side of it, using round household figures:
| Use | Water used (approx.) |
|---|---|
| A five-minute shower | 10 to 15 gallons |
| A toilet flush | 1.5 to 3 gallons |
| A load of laundry | 20 to 30 gallons |
| A dishwasher cycle | 4 to 6 gallons |
| One horse, per day | 5 to 10 gallons |
| One beef cow, per day | 8 to 15 gallons |
A typical submersible pump moves somewhere around 8 to 12 gallons a minute. So 150 gallons is only 12 to 20 minutes of actual pumping. The 30 to 60 minutes we plan around above allows for the pump switching on and off as the pressure tank fills and drains, which is when most of the energy is used. Either way, the pump is a small part of a day’s energy and a large part of the reason you cannot do without it.
What else has to run alongside the pump
The pump is rarely the only thing you need. A well-owning household in an outage usually wants the fridge, the freezer, some lights, the router and a phone charger on the same system. Rough running figures:
| Load | Running watts | Approx. Wh per day |
|---|---|---|
| Well pump (30 to 60 min) | 1,000 to 1,800W | 500 to 1,000Wh |
| Refrigerator | 100 to 200W | 1,000 to 1,500Wh |
| Chest freezer | 60 to 100W | 500 to 800Wh |
| Lights and Wi-Fi | 80W | 600 to 800Wh |
| Phones and small chargers | 20W | 100 to 200Wh |
Total: roughly 2.7 to 4.3kWh a day. That is why a 6,144Wh system gives you a day and a half or so with no sun, and why panels turn a two-day answer into an open-ended one. It is also why the sizing rule for wells is the reverse of the usual one: the pump sets the output you need, and your fridge and freezer set the battery you need.
Questions to put to the electrician before you order
- Is the pump on a dedicated 240V circuit, and how far is it from the panel?
- Will you fit a transfer switch or a smart panel, and does the quote include the permit?
- Is there a soft starter or variable-speed drive on the pump, or can one be added? Either cuts the startup surge, sometimes enough to change which unit you need.
- Can the pump circuit be the only thing the system feeds, or should the fridge and lights be on the same switch?
- Does the system’s inverter need to be grounded a particular way for your local rules?
Get the answers in writing. They are the difference between a system that runs the pump on day one and one that sits in a box waiting for a wiring job.
Which system suits which well
For most well owners, the Anker SOLIX F3800 Plus at $3,499.99 is the practical choice: it clears the 240V bar that eliminates most of the market, and it is the lowest-priced of the systems here that does. The DELTA Pro Ultra is the better fit, at a higher price, if you have a 1.5 HP pump, a long outage history, or want the 5.6kW solar input that makes the water last as long as the sun does.
Anker SOLIX F3800 Plus at Outbound Power ($3,499.99 at time of writing)
Keep reading: EcoFlow vs Anker head to head · Cheapest way to get 240V backup · All gear comparisons