Stack / GP8000E

Generac GP8000E COsense

Updated · 4 Nov 2026 · Sheet checked · 4 Nov 2026

It depends — 8,000 W running, 10,000 W starting, 120/240 V open frame; L14-30R caps 240 V at 7,200 W; bonded neutral; gasoline only

For a 30 A house inlet or a 240 V well pump on gasoline: 8,000 W running. The 10,000 W is starting watts.

Exact model G0076755 (configuration 7675-5, 49-state, 20 ft cord), per Generac's July 2026 sheet. Generac's G0077151 (49ST/CSA) shares the ratings; match your plate.

Recall: Generac's 2026 carburetor fuel-leak recall covers GP8000E models G0077150, G0076754 and G0081540 in set serial ranges, not G0076755. Check serials on Generac's recall page.

What it is

Gasoline open-frame generator, not an inverter. 420 cc OHV engine, electric start with recoil backup; battery and charger included. COsense shuts the engine off as carbon monoxide builds, monitors only while running, and per the manual is not a substitute for an indoor CO alarm.

Fuel: 7.9 gal steel tank, up to E10 (manual).

Outlets: one 120/240 V L14-30R on a 30 A two-pole breaker, two 120 V 5-20R GFCI duplexes on 20 A breakers. Sheet amps (66.6 A at 120 V / 33.3 A at 240 V) are rated running current, not receptacle ratings.

Grounding: neutral bonded to frame (sheet and manual).

No dBA figure on Generac's sheet, page or manual. Warranty 3 years residential.

Price: MSRP from US$1,179.00, generac.com (checked 4 Nov 2026).

Links: no affiliate.

What it will actually run

Running watts first: 8,000 W. Starting second: 10,000 W, motor starts only.

The manual limits the L14-30R to 7,200 W at 240 V and each 5-20R to 2,400 W. Through a 30 A inlet the panel never sees 8,000 W (30 A × 240 V, Outage Stack math).

Derating (manual): about 3.5% per 1,000 ft and 1% per 10 °F above 60 °F.

Runtime: 15 h at 25% load, 10 h at 50% (sheet, manual, page spec table). The page's feature text says 11 h; plan from 10 h.

Outage Stack math: 25% load is 2,000 W, about 0.53 gal/h (7.9 gal ÷ 15 h). 72 hours at quarter load burns about 38 gal of gasoline, roughly five tankfuls. At 5,000 ft, 8,000 W derates to about 6,600 W.

Will run (Outage Stack estimates)

Per the size table, a fridge (150–400 W running, 600–1,200 W starting), lights and phones (50–150 W), a microwave (1,000–1,500 W) and an 8–10k BTU window AC (800–1,200 W running, 1,800–3,000 W starting), plus a freezer (700 W running, manual chart), together
One 1/2–3/4 hp well pump (800–1,500 W running, 2,000–4,000 W starting) started with other motors idle

Skip or measure first

A larger well pump or any central AC: check nameplate LRA against about 42 A starting at 240 V (10,000 ÷ 240, Outage Stack math). Manual chart: 24,000 Btu AC, 3,800 W running, 3× to start
Electric heat, a range or a water heater: check nameplates against 7,200 W at 240 V
A CPAP: the 30–60 W fits, but the manual says this product "is not intended to be used in a critical life support application."

Home connection (manual): a transfer switch must isolate generator from utility power, installed by a qualified electrician; a manual transfer switch "must also switch the neutral" (3-pole) for NEC compliance. A grounding electrode is required; Generac HomeLink switches are recommended. No interlock option is named.

Specs that matter

Running: 8,000 W
Starting: 10,000 W, not continuous
120/240 V, 60 Hz, AVR
Bonded neutral; 49-state; 0–104 °F ambient (manual)
27.2 × 27 × 26.5 in, 198 lb

Who should skip it

You live in California or want CARB: this configuration is 49-state.
You want stored propane: dual-fuel Champion 201281 lists 6,750 W running on propane.
You want a 50 A inlet: Westinghouse WGen9500DF adds a 14-50R.
You only need a fridge and lights: Honda EU2200i lists 1,800 W running.

Verdict

It depends. Buy it for a neutral-switching 30 A transfer switch, a 240 V well pump and electric start on gasoline. Skip it for propane, CARB, a 50 A inlet or a 2-pole interlock. Plan from 7,200 W at 240 V through the inlet, never 10,000 W.

Sources: Generac — GP8000E spec sheet, model G0076755 / 7675-5, part A0001025753 Rev. D (ratings, outlets, runtime, neutral, weight, warranty) · Generac — G0076755 product page (MSRP, runtime) · Generac — G0077151 product page · Generac — GP6500/GP8000E owner's manual, part 10000029705 Rev. C (limits, derating, grounding, transfer, chart, warnings, COsense, fuel) · Generac — portable generator fuel-leak recall · Outage Stack — size table and live peers Champion 201281, Westinghouse WGen9500DF, Honda EU2200i. Last checked: 2026-11-04.

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