Dealectric

Best inverter for a well pump

Updated 2026-11-06

Short answer. The best inverter for a well pump is the Sun Gold Power 6000W 48V Split Phase Inverter Charger ($1,220; buy: https://dealectric.com/go/sungoldpower-6000w-48v-split-phase-inverter-charger): 6,000 W continuous, an 18,000 W surge for 20 seconds, 120/240 V split-phase output from one unit, and a 60 A charger that runs from a generator. The concern that matters is start-up surge: a well pump pulls 3 to 7 times its running watts for a second or two, so a 1 HP, 240 V pump that runs on about 1,000 W can demand 5,000 W or more at start, and one forum owner measured 38 A at 240 V, about 9,100 W. A transformer inverter that holds 18,000 W for 20 seconds covers that with margin. The usual all-in-one pick, the EG4 6000XP, holds 12,000 W for about 3.5 seconds, which starts most pumps up to 1 HP but leaves less room for an old motor or a weak battery bank.

Two honest exceptions. If you want solar charging built into the same box and the lowest idle draw, the EG4 6000XP wins: 8,000 W of solar input, about 50 W idle, a 5-year warranty, and $1,499.99 at Signature Solar on 2026-11-06. If reliability outranks price, the Victron MultiPlus-II 48/5000 120V (9,000 VA peak, 19 W idle, 5-year warranty) is the proven unit, but one makes only 120 V, so a 240 V pump needs two of them at $1,307.32 each. The Sun Gold Power unit wins for the shopper with a 240 V pump, a 48 V battery bank and a generator: it starts the hardest pumps and costs about half of the equivalent AIMS Power unit.

Where to buy

Published 2026-11-06 · prices checked 2026-11-06.

ModelSurge rating240 V from one unitAC chargerDesignPrice (seen 2026-11-06)PriceCode
Sun Gold Power 6000W 48V split phase
Buy: https://dealectric.com/go/sungoldpower-6000w-48v-split-phase-inverter-charger		18,000 W for 20 sYes60 ALow-frequency transformer$1,220 maker store$1,220No discount code applies.
AIMS Power PICOGLF60W48V240VS 6000 W18,000 W for 20 sYes60 ALow-frequency transformer$2,248.86 AIMS store$2,248.86 AIMS storeNot sold through Dealectric; listed for comparison.
EG4 6000XP12,000 W for about 3.5 sYes (3,000 W per leg)125 A, plus 8,000 W solar inputHigh-frequency, 53 lb$1,499.99 Signature Solar$1,499.99 Signature SolarNot sold through Dealectric; listed for comparison.
Victron MultiPlus-II 48/5000/70-95 120V9,000 VA peakNo, two units needed70 ALow-frequency transformer, 70 lb$1,307.32 each, NAZ Solar Electric$1,307.32 each, NAZ Solar ElectricNot sold through Dealectric; listed for comparison.
Sun Gold Power SPH6548P 6.5 kW hybrid
Buy: https://dealectric.com/go/sungoldpower-sph6548p-6-5kw-48v-hybrid-inverter		13,000 VA, hold time not publishedYes140 A, plus 2 MPPT solar inputsHigh-frequency all-in-one$1,035 maker store$1,035No discount code applies.

Rows marked with a code and buy link are products Dealectric lists: the price was verified on the brand's own US store on 2026-11-07 and the code is tested daily in that brand's cart; the date shown is its last pass (last check 2026-11-13). The other rows (AIMS Power, EG4, Victron) are included so the comparison is complete; their figures and prices were read from the makers' own US pages on 2026-11-06 and are not re-checked daily. The buy links are affiliate links: they open the brand's official US store at no cost to the shopper, and the commission pays for the testing; see the disclosure.

What owners complain about

The complaint that fills forum threads is an inverter that trips or browns out when the pump starts. Owners on the Solar Electric forum put pump inrush at 3 to 5 times running current, some at 7 times, and one measured 38 A at 240 V on a 1 HP pump. The fix is surge headroom, thicker battery cables and a bank that holds voltage under the hit; a soft-start pump such as a Grundfos SQ or a soft starter cuts the surge for a fraction of a second inverter's cost. Second is voltage: most submersible pumps are 240 V, and a single 120 V inverter cannot run them. Third is idle draw and weight: transformer inverters sit at roughly 80 W doing nothing (AIMS publishes 1.67 A DC idle, 25 W in power-save) and weigh 70 lb or more, so they drain a small bank overnight and hum under load. Sun Gold Power buyers on Trustpilot (4.3 from 195 reviews, 9% one-star) mention display and setup faults and slow technical support more than failed output; the company's inverter warranty reads 12 or 36 months by product, while its dealers list 2 years, so confirm before you buy.

Which one by need

240 V pump, 48 V bank, generator charging: the Sun Gold Power 6000W 48V unit. Same 18,000 W, 20-second surge and 60 A charger as the AIMS Power unit for about $1,000 less. Solar and pump on one box: the EG4 6000XP, with 8,000 W of solar input, about 50 W idle and a 5-year warranty, as long as the pump is 1 HP or smaller or has a soft starter. The Sun Gold Power SPH6548P is the budget version of that idea with more charge current, but it does not publish how long it holds its 13,000 VA peak. Mission-critical reliability: two Victron MultiPlus-II 48/5000 120V units configured for split phase, at roughly $2,600 for the pair.

Not recommended

A single 120 V inverter for a 240 V pump, whatever its wattage. A 4,000 W-class high-frequency inverter with no published surge hold time for anything above a 1/2 HP pump. A modified sine wave inverter, which overheats pump motors and solid-state control boxes. Any inverter fed by a 120 V-only generator if you pick the Sun Gold Power unit, since its charger needs a 240 V input.

Sources

Published 2026-11-06; figures for other brands read on 2026-11-06; our prices verified 2026-11-07. Corrections welcome at [email protected] or /feedback.