Generac GP15500E 15,500W Portable Generator, Gas, Electric Start

High‑capacity Generac GP15500E portable generator delivering up to 15,500 running watts and 19,300 starting watts, ideal for home backup, jobsites, and heavy‑duty applications, with electric start and large fuel tank for extended runtime.

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Generac GP15500E 15500W Portable Generator for sale

The Generac GP15500E portable generator (current EFI configuration sold as model 7705 / GP15500EFI) provides serious power for emergency home backup, construction sites, and demanding DIY projects. With up to 15,500 running watts and 19,300 starting watts, it can support large loads such as well pumps, air conditioners, refrigerators, power tools, and lighting circuits at the same time when properly connected through a manual transfer switch.

An 800+ cc OHVI / EFI engine with full‑pressure lubrication is engineered for long life and fuel efficiency, providing up to about 10–11 hours of runtime at 50% load from its large gasoline tank. The generator includes electric start (battery included on EFI version), automatic low‑oil shutdown, and circuit‑breaker‑protected outlets for convenient and safe operation. A hardened steel tube cradle, integrated lifting eye, and heavy‑duty wheel kit make this unit easier to transport and secure on the jobsite or around the home.

The newer GP15500EFI variant adds electronic fuel injection, TruePower Technology with low THD for sensitive electronics, and COsense carbon‑monoxide detection for enhanced safety. When paired with a Homelink‑type manual transfer switch, it can act as a powerful alternative to a permanent home standby generator for many customers.

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Key features

• 15,500 running watts and up to 19,300 starting watts for high‑demand applications.

• Gasoline‑powered OHVI / EFI engine with full‑pressure lubrication and spin‑on oil filter for extended engine life.

• Large fuel tank (around 14–16 gal depending on version) with built‑in fuel gauge for long runtimes at 50% load (about 10–11 hours).

• Electric start with onboard start/stop switch; battery included with EFI model.

• Idle control (legacy GP15500E) to reduce noise and conserve fuel when loads are low.​

• TruePower Technology on EFI version for cleaner power (low THD) suitable for sensitive electronics and tools.

• COsense Technology on EFI version to detect hazardous carbon monoxide and shut down / alert.

• Heavy‑duty 1 1/4″ steel tube cradle and integrated lifting eye for durability and easier handling.

• Hour meter for tracking maintenance intervals.

• Heavy‑duty, never‑flat or large pneumatic wheels and handle for portability (wheel kit included).

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Technical specifications – Buy Generac GP15500E 15,500W Portable Generator

Electrical

• Running watts: 15,500 W.

• Starting (surge) watts: 19,300 W.

• AC voltage output: 120/240 VAC single‑phase.

• Frequency: 60 Hz.

• Rated VAC amperage (running): approx. 64.5 A at 240 V (129 A at 120 V on EFI spec).​

• Maximum VAC amperage (legacy spec): approx. 187.8/93.75 A (120/240 V) on GP15500E listing.​

• Automatic voltage regulation (AVR): Yes.​

• Neutral: bonded to frame on EFI, floating neutral listed on some earlier GP15500E specs (confirm per SKU).

Engine & performance

• Engine type: Generac OHVI / EFI‑equipped OHV engine, air‑cooled.

• Displacement: approximately 816–992 cc depending on generation; current EFI spec lists 816 cc, older GP15500E spec ~992 cc.

• Engine speed: 3600 RPM.

• Fuel type: gasoline.

• Recommended oil: 10W‑30 / SAE 30 (per earlier GP15500E spec).​

• Lubrication: oil pump, full‑pressure lubrication; spin‑on oil filter.

• Oil capacity: about 2.1–2.2 qt (around 2.1 L) on EFI spec sheet.

Starting & protection

• Starting method: electric start (recoil backup may not be provided on EFI; check exact package).

• Battery: 12 V starting battery, typically U1 type on earlier GP15500E; battery included with GP15500EFI.

• Low‑oil shutdown: low‑oil pressure shutdown to protect engine.

• COsense carbon monoxide protection (EFI model): monitors CO levels and triggers alerts/shutdown.

• Circuit breaker–protected outlets and main breakers on control panel.

Fuel system & runtime

• Fuel tank capacity: approx. 14.2–16 gal (54–60.6 L) depending on version.

• Fuel gauge: built into tank.

• Run time at 50% load: about 10–11 hours (EFI spec states up to 11 hours at 50% load).

• Fuel shutoff: on fuel tank.​

Dimensions & weight

(Values vary slightly between earlier GP15500E and current EFI configuration; use the set that matches the exact model you import.)

• Earlier GP15500E listing:

  • Length: about 48.5 in.​

  • Width: about 31 in.​

  • Height: about 39.5 in.​

  • Weight: about 363 lb (165 kg).​

• GP15500EFI (current Generac spec):

  • Length: approx. 39.5 in (100.3 cm).

  • Width: approx. 30.9 in (78.6 cm).

  • Height: approx. 36.5 in (92.8 cm).

  • Weight: about 420 lb (191 kg).