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NEC 220 Generator Sizing Report
Prepared by Bo's Generators
bosgenerators.com | Fort Myers (239) 275-4502 · Sarasota (941) 289-3940 · WPB (561) 467-4691

NEC 220 Load Calculation

Site and Sizing Form

Complete each section to generate a load schedule and recommended generator size per NEC 220.82 (Optional Method).

1 - Prepared by

Your company and contact info. Save your form once and these fields will autofill next time.

2 - Customer & site

3 - Electrical service

4 - Fuel type

Natural gas (NG)
Propane (LP)
Diesel
Bi-fuel

5 - Structure & coverage

Typical loads for this structure type
Central A/C + gas furnace (2-5 ton), electric range or cooktop, electric water heater (~4.5 kW), electric clothes dryer (~5.5 kW), dishwasher, microwave, refrigerator. Add a well pump or pool pump only if present at this site. Verify nameplate values before accepting tool defaults.

6 - HVAC units 0 units

Include all heat pumps, A/C condensers, air handlers, and furnaces. Enter nameplate amperage from the equipment label.

7 - Cooking appliances 0 items

8 - Water heaters 0 units

9 - EV chargers 0 chargers

Per NEC 220.57, list each EVSE circuit. Include level 2 (240V) and DC fast chargers.

10 - Pumps & motors 0 loads

Include well pumps, sewage ejectors, pool/spa pumps, irrigation, and sump pumps. Largest single motor will be calculated at 125% per NEC 430.

11 - Other electrical loads

12 - Transfer switch & installation

Defaults to state cycle (FL 2023, GA 2020, TN 2017). Override only if you know the specific AHJ enforces a different cycle. Always verify with local AHJ before install.
Many homeowners can pull this from their utility app in under a minute. Tool runs the larger of (220.82, Part III, BillingHistory × 1.25); never sizes downward off this number.
By default the printed PDF includes an appendix with generator placement clearance requirements (NFPA 72, ICC IRC R315). Check this only when the placement walkthrough has already been completed with the customer and the install team.

13 - Attachments 0 files

Upload supporting documents that should travel with this estimate. Helpful to include: a clear photo of your main panel label, site plan or survey, and property photos. Images will be embedded in the printed report. PDFs will be listed as references (send separately).

14 - Customer notes

Load calculations per NEC 220.82 (Optional Method). For existing dwellings with metered load data, NEC 220.83 may also apply. Results are for estimation purposes only. A licensed electrician must verify final sizing, conductor sizing, and AHJ compliance before installation.

NEC 220 Load Schedule & Generator Recommendation

This report was generated using the Bo's Generators NEC 220 sizing tool. Calculations follow NEC 220.82 (Optional Method). Final sizing must be verified by a licensed electrical contractor. © Bo's Generators, a Power Support Partners brand.