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A real 4500-watt-class example
Westinghouse iGen4500DFc dual-fuel inverter generator
Research-based example, not an owner-tested recommendation. The iGen4500DFc manual lists 4,500 peak / 3,700 running watts on gasoline and 4,050 peak / 3,330 running watts on propane. It supplies 120V; it is not a 240V whole-house solution.
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First: does 4500 mean running or starting watts?
A 4,500-running-watt generator and a 4,500-peak-watt generator have different usable continuous capacity. The iGen4500DFc example above has 3,700 running watts on gasoline. Its 4,500-watt figure is temporary starting capacity. Propane lowers both ratings on this model. Use the exact manual for the model and fuel you will run, not a similar product’s name.
Also check voltage, receptacles and circuit limits. Enough total watts cannot run equipment needing an unavailable voltage. A 120V-only unit is not the answer for a 240V well pump, electric range or central air system.
Realistic load plans: examples, not appliance specifications
The following numbers are illustrative planning inputs, not measured performance or universal appliance ratings. Substitute each appliance’s label, manual or manufacturer startup information before relying on a plan. A plug-in energy meter can help with steady consumption but may miss a brief motor surge.
| Illustrative load | Running watts | Total startup watts assumed |
|---|---|---|
| Refrigerator | 600 | 1,800 |
| LED lights combined | 80 | 80 |
| Router | 20 | 20 |
| Fan | 100 | 200 |
| Microwave input demand | 1,500 | 1,500 for this arithmetic example |
Example 1: refrigerator, lights, router and fan
The running total is 800 watts: 600 + 80 + 20 + 100. If the refrigerator starts while the others run, the temporary total is 2,000 watts: 1,800 + 80 + 20 + 100. This arithmetic fits below the example generator’s fuel-specific ratings, leaving room on paper. It is not a guarantee for your refrigerator or a promise that every motor can start together.
Example 2: add a microwave briefly
Adding the assumed 1,500-watt microwave brings continuous demand to 2,300 watts and the refrigerator-start scenario to 3,500 watts. Both are below this model’s gasoline ratings; the continuous load is also below its propane running rating and the temporary figure below its propane peak rating. Actual microwave electrical input may exceed the advertised cooking wattage. Check the input label and avoid another high-load appliance while cooking.
Example 3: the space heater that changes the plan
An illustrative 1,500-watt heater added to that microwave plan takes continuous demand to 3,800 watts. That exceeds this example’s running rating on either fuel even though 3,800 is less than the 4,500 peak label. Run fewer loads, choose a different approach or size a larger suitable generator from real demand. Do not rely on the overload trip as your planning method.
What about air conditioning, pumps and power tools?
These need a separate startup check. RV air conditioning, compressors and saws can demand much more while starting than while running. A nameplate running value alone is insufficient. Verify voltage, startup demand, other simultaneous loads and manufacturer compatibility. Do not promise an RV air conditioner will work just because its normal watts fit.
- List what must run during the outage and what can wait.
- Total the running demand of the equipment used together.
- Add the largest relevant additional startup demand, accounting for any automatic overlap.
- Compare with fuel-specific running and peak ratings, with practical headroom.
- Check outlet, cord, voltage and transfer-equipment limits.
If an appliance’s starting figure already includes its running demand, do not add that full figure twice. Our starting-watts vs. running-watts guide walks through the distinction.
Choose by the load plan, not the class label
A 4500-watt-class unit can be useful for selected essentials, but it is not permission to run the house normally. Start with the full homeowner generator-sizing guide. Compare gasoline and propane output tradeoffs and safe outdoor rain planning. If the refrigerator is the main concern, overnight refrigerator backup with a power station may be a more relevant buying question.
Sources and editorial limits
Sources checked October 2, 2026: Westinghouse iGen4500DFc manual · CDC generator and CO guidance.
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