Portable inverter generators / Comparison

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Gasoline and dual-fuel (gasoline and propane) inverter generators up to about 7,500 W sold new in the US for portable use. Conventional non-inverter generators, home standby generators, battery power stations and measured noise, fuel-economy or reliability rankings are outside this catalogue. This catalogue gives no electrical connection, transfer switch or installation advice; follow the manufacturer's manual and a qualified electrician where the manual requires one.

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Documented specifications and exact purchase packages
Compare the details	GP3300i with COsense 71533, 49ST/CSA (US)
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US purchase package	Model 71533 (Generac variant G0071533, 49ST/CSA); Home Depot Internet 332609732, store SKU 1012775437; generator only, parallel kit 7668-0 not included Product & sources The seller's GTIN 0696471104011 matches the UPC Generac prints for models 7153-2 and 7153-3; Generac's 2024 sheet uses the same UPC for both configurations. Generac lists a 3-year limited residential and 2-year limited commercial warranty. Price, stock and delivery are not recorded. Sources · 2026-10-21 The Home Depot: Generac GP3300i 71533 inverter generator listingChecked 2026-10-21. Read the original source and its check date before relying on this value.Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Generac: GP3300i specification sheet, part A0001004680 Rev. E (08/30/2024)Checked 2026-10-21. Read the original source and its check date before relying on this value.
Where to buy	Select: Model 71533 (Generac variant G0071533, 49ST/CSA); Home Depot Internet 332609732, store SKU 1012775437; generator only, parallel kit 7668-0 not included View at The Home Depot — GP3300i with COsense 71533, 49ST/CSA (US); opens in a new tab The link may open several packages. Check current price and availability with the seller. Opens in a new tab.
Inverter design and frame Whether the generator is a fully enclosed suitcase-style unit or an open-frame inverter, with documented handles and wheels. Enclosure and frame describe construction only. Quiet wording on a product page is a manufacturer description, not a measured result.	Enclosed inverter with a single handle molded into the enclosure, 22.3 x 13.4 x 18.4 in (L x W x H) on the product page.The 2024 sheet lists 22.2 x 13.3 x 18.4 in. Sources · 2026-10-21 Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Generac: GP3300i COsense brochure (2/2023)Checked 2026-10-21. Read the original source and its check date before relying on this value.
Fuels documented The fuels the manufacturer documents for the exact model, with any propane hose or regulator it lists. Propane operation needs a separately supplied cylinder. Conversion kits and other fuels are not part of these records.	Gasoline only, in a 1.06 gal (4 L) tank. No propane operation is documented. Sources · 2026-10-21 Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Generac: GP3300i specification sheet, part A0001004680 Rev. E (08/30/2024)Checked 2026-10-21. Read the original source and its check date before relying on this value.
Gasoline and propane Whether the manufacturer documents operation on both gasoline and propane for this model. False means the manufacturer documents gasoline only for this model. Separate dual-fuel versions of a family are different SKUs.	NoThe manufacturer documents gasoline operation only and publishes no propane rating. Sources · 2026-10-21 Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Generac: GP3300i specification sheet, part A0001004680 Rev. E (08/30/2024)Checked 2026-10-21. Read the original source and its check date before relying on this value.
Running watts on gasoline The continuous running or rated output the manufacturer publishes for gasoline operation. Add the running watts of everything that runs at once and keep a margin. Altitude and temperature can reduce output, as the manuals describe.	2500 WRunning Watts 2,500; AC rated output running watts 2500. Sources · 2026-10-21 Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Generac: GP3300i specification sheet, part A0001004680 Rev. E (08/30/2024)Checked 2026-10-21. Read the original source and its check date before relying on this value.
Starting watts on gasoline The short-term starting, peak, surge or maximum output figure published for gasoline, with the maker's own term kept in the note. This figure covers brief motor starts, not continuous use. It is not comparable with another maker's running watts.	3300 WStarting Watts 3,300. Generac describes PowerRush as over 50 percent more starting capacity. Sources · 2026-10-21 Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Generac: GP3300i specification sheet, part A0001004680 Rev. E (08/30/2024)Checked 2026-10-21. Read the original source and its check date before relying on this value.
Running watts on propane The continuous running or rated output published for propane operation on a dual-fuel model. Propane ratings are lower than gasoline ratings on the models recorded here. Not applicable marks a model documented for gasoline only.	Not applicable This field does not apply to this purchase option. It is different from a value we have not verified. The manufacturer documents gasoline operation only and publishes no propane rating. Source · 2026-10-21 Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Starting watts on propane The short-term starting or peak output published for propane operation. A starting figure is not a running rating. Not applicable marks a model documented for gasoline only.	Not applicable This field does not apply to this purchase option. It is different from a value we have not verified. The manufacturer documents gasoline operation only and publishes no propane rating. Source · 2026-10-21 Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Engine displacement The published engine displacement. Displacement is context, not an output rating. Use the running watts to size the generator.	149 ccGenerac OHV engine, 149cc. Sources · 2026-10-21 Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Generac: GP3300i specification sheet, part A0001004680 Rev. E (08/30/2024)Checked 2026-10-21. Read the original source and its check date before relying on this value.
Gasoline tank capacity The published gasoline tank capacity. Run time per tank depends on load. Do not divide one generator's tank by another's run time to estimate fuel use.	1.06 galPage: 1.06 gal (4 L). The 2024 sheet prints 106 (4.0). Sources · 2026-10-21 Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Generac: GP3300i specification sheet, part A0001004680 Rev. E (08/30/2024)Checked 2026-10-21. Read the original source and its check date before relying on this value.
Gasoline run time at 25% load The manufacturer's stated run time on a full gasoline tank at 25 percent or one-quarter load. Recorded only where the maker states this load. A half-load or rated-load figure is not converted; it stays in the run time conditions field.	7 hRun Time at 25% (Hours) 7. Sources · 2026-10-21 Generac: GP3300i specification sheet, part A0001004680 Rev. E (08/30/2024)Checked 2026-10-21. Read the original source and its check date before relying on this value.Generac: GP3300i COsense brochure (2/2023)Checked 2026-10-21. Read the original source and its check date before relying on this value.
Run time figures and their loads Every published run time figure with the load, fuel and tank it refers to. Run times are manufacturer estimates. Figures at different loads or fuels are different claims and are never compared as if equal.	7 h at 25% load and 4.5 h at 50% load on the 1.06 gal tank. Sources · 2026-10-21 Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Generac: GP3300i specification sheet, part A0001004680 Rev. E (08/30/2024)Checked 2026-10-21. Read the original source and its check date before relying on this value.Generac: GP3300i COsense brochure (2/2023)Checked 2026-10-21. Read the original source and its check date before relying on this value.
Published sound level and its basis Each published sound figure with the load and measuring distance the manufacturer states, or a note that they are not stated. A figure without a stated load and distance cannot be compared with one that has them. As low as wording usually describes the lightest load.	Not verified We have not verified this value. It is not a confirmed no or zero. Check the original source or ask the manufacturer if it affects your choice. Neither the product page nor the 2023 brochure nor the 2024 sheet publishes a sound level; the page describes Quiet Inverter Power and Economy Mode only. Sources · 2026-10-21 Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Generac: GP3300i specification sheet, part A0001004680 Rev. E (08/30/2024)Checked 2026-10-21. Read the original source and its check date before relying on this value.Generac: GP3300i COsense brochure (2/2023)Checked 2026-10-21. Read the original source and its check date before relying on this value.
Receptacles The AC receptacles by NEMA type and rating, with DC and USB outputs and parallel ports. Check plug types against what you will connect. Connecting a generator to home wiring is outside this catalogue; follow the manual.	One 120 V 20 A 5-20R duplex, one 120 V 30 A L5-30 twist-lock, 5 V USB outlets rated 1 A and 2.1 A, and parallel outlets.The 2023 brochure prints (2) 120V 20A 5-20R Duplex; the 2024 sheet's panel labels one 5-20R duplex outlet. Sources · 2026-10-21 Generac: GP3300i specification sheet, part A0001004680 Rev. E (08/30/2024)Checked 2026-10-21. Read the original source and its check date before relying on this value.Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
TT-30R RV receptacle Whether the exact model has a 120 V 30 A TT-30R receptacle as documented by the manufacturer. An L5-30R twist-lock is a different receptacle and does not satisfy this field. Companion or RV versions of a family can differ.	NoThe 30 A receptacle is an L5-30 twist-lock, not a TT-30R. Generac's separately sold parallel kit 7668-0 lists a TT-30R. Sources · 2026-10-21 Generac: GP3300i specification sheet, part A0001004680 Rev. E (08/30/2024)Checked 2026-10-21. Read the original source and its check date before relying on this value.Generac: GP3300i COsense brochure (2/2023)Checked 2026-10-21. Read the original source and its check date before relying on this value.
Carbon monoxide shutoff system The manufacturer's name and description for the generator's built-in carbon monoxide monitoring and shutoff, quoted as published. The manufacturers reviewed state these systems do not replace CO alarms or outdoor-only operation. Thresholds are not published.	COsense Technology: Generac's wording is STOPS. ALERTS. SAVES. Powerful protection against hazardous carbon monoxide. The control panel has COsense red (hazard) and yellow (fault) indicators.The reviewed page and sheets do not describe the shutdown behavior or threshold beyond this wording. Sources · 2026-10-21 Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Generac: GP3300i specification sheet, part A0001004680 Rev. E (08/30/2024)Checked 2026-10-21. Read the original source and its check date before relying on this value.
Parallel capable Whether the manufacturer documents connecting two compatible units with a parallel kit. Parallel kits are sold separately unless the package lists one. Compatible pairings are those the manufacturer names.	YesParallel ready with kit 7668-0 sold separately; Generac says it connects any two Generac 3300 or 3500 Series inverters of the same output. Sources · 2026-10-21 Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Generac: GP3300i COsense brochure (2/2023)Checked 2026-10-21. Read the original source and its check date before relying on this value.
Starting method Recoil, electric push-button or remote start as documented, with any battery supplied. Electric and remote start rely on a battery; follow the manual's charging and storage instructions.	Recoil pull start, with choke, run and off on the PowerDial. Sources · 2026-10-21 Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Generac: GP3300i specification sheet, part A0001004680 Rev. E (08/30/2024)Checked 2026-10-21. Read the original source and its check date before relying on this value.
EPA and California status The manufacturer's EPA, CARB or 49-state wording for the selected SKU. California-compliant versions are often separate model codes. An absent CARB statement is recorded as not stated, not as compliant.	Generac names the selected variant G0071533 49ST/CSA, and the 2024 sheet lists 7153-2 (49ST) and 7153-3 (49ST/CSA). No CARB wording is stated for this variant.The 2023 brochure linked from the same page lists variants G0071531 and G0071530 with configuration 50ST/CSA; that configuration is not attributed to G0071533. Sources · 2026-10-21 Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Generac: GP3300i specification sheet, part A0001004680 Rev. E (08/30/2024)Checked 2026-10-21. Read the original source and its check date before relying on this value.
Unit weight The published unit or dry weight, with the manufacturer's basis kept in the note. Oil, fuel and a battery add weight. Shipping weights are not used here.	61 lbPage and 2024 sheet: 61 lb (27.7 kg) unit weight; shipping weight 68 lb. The older 2023 brochure lists a 59.5 lb product weight. Sources · 2026-10-21 Generac: Portable Inverter Generator 3300i with COsense 49ST/CSA product page (G0071533)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Generac: GP3300i specification sheet, part A0001004680 Rev. E (08/30/2024)Checked 2026-10-21. Read the original source and its check date before relying on this value.
Items in the package Accessories the manufacturer or seller lists for the exact US package. Parallel kits, covers, wheel kits and propane cylinders are included only when the package list names them.	Engine oil, oil funnel, tool kit and owner's manual per the 2024 sheet. The parallel kit is sold separately. Source · 2026-10-21 Generac: GP3300i specification sheet, part A0001004680 Rev. E (08/30/2024)Checked 2026-10-21. Read the original source and its check date before relying on this value.
Questions to check before buying	Generac publishes no sound level for the GP3300i, so its noise cannot be compared with the other models here. Generac's own documents differ on weight (61 lb on the page and 2024 sheet, 59.5 lb in the 2023 brochure) and on variant numbers and configuration (G0071533 49ST/CSA on the page, G0071531 and G0071530 50ST/CSA in the brochure). The COsense shutdown threshold and behavior are not described beyond Generac's marketing wording and indicator labels.

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