Skip to content

Best-of · 136 qualified

Generators with the lowest cost per watt

Ranked by listed price divided by running watts.

How this list works

Cost per watt ignores noise, fuel flexibility and build quality. 136 products in our catalog meet the rule; the top 8 are shown.

#1 · $0.09/W

DuroMax 13,000 Watt Dual Fuel Portable Generator (DS13000MX)

The DuroMax 13,000 Watt Dual Fuel Portable Generator (DS13000MX) is a dual-fuel portable generator rated at 10,500 running watts and 13,000 starting watts.

Watch: Specifications are the maker's or seller's; Wattstanding has not tested this product.

$899View at DuroMax Full reference

#2 · $0.09/W

A-iPower 4600W Portable Open-Frame Inverter Generator With CO Alert-SUA4600iF

The A-iPower 4600W Portable Open-Frame Inverter Generator With CO Alert-SUA4600iF is an inverter generator rated at 4,600 running watts and 4,600 starting watts.

Watch: Specifications are the maker's or seller's; Wattstanding has not tested this product.

$399.19View at A-iPower Full reference

#3 · $0.10/W

DuroMax 13,000 Watt Tri Fuel Portable Generator (DS13000MXT)

The DuroMax 13,000 Watt Tri Fuel Portable Generator (DS13000MXT) is a tri-fuel portable generator rated at 10,500 running watts and 13,000 starting watts.

Watch: Specifications are the maker's or seller's; Wattstanding has not tested this product.

$999View at DuroMax Full reference

#4 · $0.10/W

Westinghouse Outdoor Power WGen10500DFc - Dual Fuel

The Westinghouse Outdoor Power WGen10500DFc - Dual Fuel is a dual-fuel portable generator rated at 12,500 running watts and 10,500 starting watts.

Watch: Specifications are the maker's or seller's; Wattstanding has not tested this product.

$1,249View at Westinghouse Outdoor Power Full reference

#5 · $0.10/W

Westinghouse Outdoor Power WGen9500DF Generator - Dual Fuel

The Westinghouse Outdoor Power WGen9500DF Generator - Dual Fuel is a dual-fuel portable generator rated at 12,500 running watts and 8,500 starting watts.

Watch: Specifications are the maker's or seller's; Wattstanding has not tested this product.

$1,249View at Westinghouse Outdoor Power Full reference

#6 · $0.11/W

WEN GN400iM RV-Ready 4000-Watt Open Frame Inverter Generator

The WEN GN400iM RV-Ready 4000-Watt Open Frame Inverter Generator is an inverter generator rated at 3,500 running watts and 4,000 starting watts.

Watch: Specifications are the maker's or seller's; Wattstanding has not tested this product.

$374.99View at WEN Full reference

#7 · $0.11/W

Westinghouse Outdoor Power WGen3600DFv Generator - Dual Fuel

The Westinghouse Outdoor Power WGen3600DFv Generator - Dual Fuel is a dual-fuel portable generator rated at 4,650 running watts.

Watch: Specifications are the maker's or seller's; Wattstanding has not tested this product.

$499View at Westinghouse Outdoor Power Full reference

#8 · $0.11/W

Westinghouse Outdoor Power WGen11500DFc - Dual Fuel

The Westinghouse Outdoor Power WGen11500DFc - Dual Fuel is a dual-fuel portable generator rated at 13,500 running watts and 11,500 starting watts.

Watch: Specifications are the maker's or seller's; Wattstanding has not tested this product.

$1,449View at Westinghouse Outdoor Power Full reference

Method

Qualifying rule: At least 3,000 running watts and a listed price.
Ranking: Price per running watt — lowest first (3,000 W and larger).
No lab claims. Rankings use makers' and sellers' published specifications and the prices we observed; Wattstanding has not tested these products.
Prices change. Price-based rankings reflect the date shown on each product page.

Affiliate disclosure · How we work