Will a power station run a well pump?
Scenarios Updated 2026-08-08
Usually not, and the reason is the start rather than the run. The pump in this library draws 660 W while it is pumping, which most portable machines carry comfortably, and it asks 6,762 W for the fraction of a second when the rotor is still stationary.
Run against every published US machine here, 1 of 12 clears that start. More useful than the count: the other eleven are stopped by three different ceilings, and which one applies to your machine is the difference between a fixable problem and an unfixable one.
What a submersible pump actually asks for
The numbers a verdict on this load is computed from
All of them come from one motor maker’s own engineering manual, which is unusual for this class of load: Franklin states WATTS rather than only amps, so nothing here is a voltage-times-current estimate. The fourth row is the one nobody expects to matter, and it is what decides a machine further down this page.
Full-load watts for a half-horsepower two-wire motor at 115 V. Comfortably inside most of this library — the running draw is not what stops these machines.
See the record →The demand while the rotor is still stationary, converted from the same manual’s locked-rotor amperes at the same mains voltage. This is the figure that decides most of the column.
Locked rotor over full load. Large by the standards of this library, and a property of induction motors generally rather than of this particular pump.
Back-calculated from the same table’s full-load watts and full-load amps. Low, as single-phase motors of this size are, which is why the watt figure understates the load.
An inverter carries volt-amps, not watts. On a load with a power factor this low the two are far apart, and one machine here is stopped on the difference alone.
The record’s full-load watts divided by the record’s power factor. Both terms are the motor maker’s; the division is ours, and it is the quantity the engine holds against a VA ceiling.
The empty row is why there is no ranked list behind this page: with nothing to multiply the draw by, no row here can print an hour figure.
The pump’s maker states a maximum number of starts per twenty-four hours, which is a motor service limit rather than a fraction of time spent running. How often a pump runs is set by a household’s water use and its pressure tank, so the calculator asks for that figure instead of assuming one.
Official spec + Derived by WattPairverified 2026-08-01well pump record · US 115 V
The gap between the second row and the fifth is where most sizing advice goes wrong. A shopper reads 660 W on a pump, adds a comfortable margin, and buys an inverter rated a few hundred watts above it. That inverter then has to carry 1,157.9 VA for the whole time the pump runs, and 6,762 W at the instant it starts — one quantity the watt reading hides, and one it is 5.9× short of.
Eleven refusals, three different ceilings
Live runs: the one that starts it, and one of each way to fail
Four machines out of the twelve, chosen to show each outcome the engine returns on this load. The counts behind them: 7 of 12 are stopped on the start-up ceiling, 3 of 12 on continuous output, and 1 of 12 on the VA ceiling.
The one machine here that clears the start, and it does so on a published start-up ceiling rather than on capacity: the demand sits at roughly five-sixths of that ceiling, while the running draw is under a fifth of continuous output — which several smaller machines also manage.
Show the working →The commonest outcome on this page and the least intuitive. The running draw is under a quarter of continuous output; the start-up demand is above a published surge ceiling more than twice as large as the running load. Buying more continuous watts does not move this row.
Show the working →The straightforward one: the running draw alone is more than twice this machine’s continuous rating, so the start never comes into it. Three machines here stop at that first clause.
Show the working →The row worth staring at. The running draw never exceeds this record’s continuous rating at all, and the answer is still no — because volt-amps rather than watts are what an inverter has to carry, and a power factor of 0.57 puts the volt-amps well above the ceiling. This is the only row in the library the VA clause decides.
Show the working →What actually changes the answer
In the order that moves the outcome most
Read your own verdict first: which of the three ceilings stopped a given machine decides which of these is worth doing at all.
A continuous-output refusal and a start-up refusal look identical on a shopping page and are completely different problems. Every pairing on this site names the clause that decided it.
Open the source →For the machines stopped on the start, the specification separating them from the one that is not is a published start-up ceiling. Two records here state none, and the engine then holds the demand against the continuous rating instead — the conservative reading, and the reason those two are stopped on a figure their makers never wrote down.
A pump wired for the higher of the two US supply voltages is a different machine electrically, and this engine holds no mains-voltage gate, so it is outside what any verdict here covers. Everything on this page is the lower-voltage record.
A larger pressure tank means fewer starts; a motor-rated inverter or a soft starter changes the start-up demand itself. None of those is a purchase this site ranks, and all of them move the number that is actually in the way.
The machine that starts this pump is instructive for a reason that has nothing to do with its size. It is not the largest battery here; it is the record with the largest PUBLISHED start-up ceiling, 8,000 W against a demand of 6,762 W. Two of the eleven belong to machines whose makers state no start-up figure at all, so the engine holds the locked-rotor demand against the continuous rating instead. Those two may well start a pump in somebody’s shed. We have found no published figure that would let us say so, and a refusal we can defend is worth more than a pass we cannot.