Well & Sump Pump FAQs
Practical questions about multiple pumps, credible start timing, jet pumps, voltage drop, and safe connections.
Can a sump pump and well pump run on the same generator?
They can share a properly designed generator-backed system only when the continuous load and every credible start scenario fit the selected generator and connection. Model each pump as its own load. If they can start together, evaluate that event; if listed controls guarantee sequencing, document the controlled sequence instead of assuming coincidence or noncoincidence.
How should I plan for two well pumps?
Keep a separate record for each pump’s voltage, applicable running current, and defined starting current. Test the largest credible start scenario and any simultaneous start the controls or operating pattern permit. Do not double-count a pump’s running demand when replacing it with its starting demand.
Do jet pumps use the same generator-sizing table as submersible pumps?
Not automatically. A jet pump has an accessible surface motor and may have different motor, voltage, and starting data from a same-HP submersible pump. Use the jet pump motor’s exact nameplate or manufacturer documentation; do not transfer a submersible-motor row based on horsepower alone.
Can I run a hard-wired well pump from an extension cord?
A hard-wired pump should be supplied through transfer equipment and a connection designed for the pump circuit, not improvised with an extension cord or backfeed cord. A qualified electrician should verify the inlet, transfer equipment, circuit, grounding and bonding, neutral arrangement, and local requirements.
Does a long well-pump circuit affect generator performance?
Conductor length, size, material, connections, and motor-start current can affect voltage drop at the pump. Do not compensate by guessing a larger starting-watt range. Have the circuit and starting voltage checked when distance or performance is a concern, then verify the result against the pump and generator manufacturers’ limits.
For portable-generator carbon-monoxide precautions, see the U.S. Consumer Product Safety Commission’s portable-generator guidance.
If you have each pump’s voltage, running current, and LRA or other defined starting current, open the generator sizing calculator and evaluate the pumps with the other loads you plan to power.