Electrical Panel Load Assessment

What This Is

Calculate your home's real electrical demand using the same NEC code standard a licensed electrician uses for permits.

How To Use It

Enter your home details, current panel size, and existing appliances. Then add any upgrades you're planning — EV charger, heat pump, and more.

Why It Matters

Adding modern loads to an undersized panel is a hidden safety and capacity risk. This tells you straight whether your panel can handle what's next.

Home Details

Habitable Square Footage 2,000 sq ft

Exclude garage, open porches, unfinished spaces (per NEC 220.12). Sunny calculates what your system is carrying now — and what it'll need to carry next.

Current Panel Size How do I find this?

How to find your panel size

Find your breaker panel — grey metal box in garage, utility room, or outside.

Look for the main breaker at the top — it controls everything.

Read the number on the main breaker — common sizes: 100A, 150A, 200A.

Not sure? Select 100A — most common in Central Texas.

Year Home Was Built

Service Type

Existing Appliances

Uncheck anything you don't have

Heating / Cooling — select one

Central A/C

Avg 8 kW unit · 33.3A × 240V

Electric Furnace

Avg 12 kW unit · 50A × 240V

Planned Additions

What are you looking to add?

🔌 Your Panel Assessment Is Ready

Sunny's run the full NEC 220.83 calculation. Enter your info and your results unlock instantly — right here.

Lord Overload & The Rusted Relic — Threat Assessment

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NEC-calculated demand — your panel's real load

0A100A panelOver capacity

NEC 220.83 Breakdown

General lighting (sq ft × 3 VA)—

Required branch circuits4,500 VA

Existing appliances (non-HVAC)—

After tiered demand factor—

NEC calculated demand—

Calculated service amps—

Recommended service size—

Per 2023 NEC § 220.83 optional method (Texas adopted Sept. 2024). Lighting: 3 VA/sq ft. Demand: 100% on first 8 kVA, 40% on remainder. HVAC added at 100% outside tiered demand; only larger of heating or cooling used.

"Sunny sees what your system was built for, what it's carrying now, and what it'll need next. Get your full assessment — real answers, no pressure."

Schedule a Consultation

$119 consultation, credited toward same-day approved work · flat price quoted on site, before any work starts
* Average only — not a quote or estimate of work

🔌 Threat Identified

Lord Overload

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Your — panel is currently running at:

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Of its safe capacity

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The Turn

Then Supersun Sends In Sunny

Sunny sees what your system was built for, what it carries now, and what it'll be asked to handle next. A licensed service upgrade — sized correctly, grounded properly, and pulled to code — clears the threat and future-proofs your home for everything you're planning to add.

"I see what your system was built for, what it's carrying now, and what it'll handle next. That's not theory — it's protection." — Sunny

✓ Your Home, Future-Proofed

Recommended service size for your home:

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Amp service

—

Current panel

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NEC calculated demand

Code

Permit + inspection

Lifetime

Workmanship warranty

Your NEC 220.83 Assessment

Home size—

Current panel—

Year built—

NEC calculated demand—

Recommended service—

Per 2023 NEC § 220.83 optional method (Texas adopted Sept. 2024). This is a calculation, not a quote — pricing is given on site after a licensed electrician looks at your panel.

⚠️

This is an estimate, not a final assessment. This calculator is an educational planning tool. To be code-compliant and safe, a licensed electrical contractor must perform the actual load assessment on-site before any work is done. Supersun (TECL #39536) will verify these numbers in person.

Adding modern loads to an undersized panel is a real safety risk. One call to Supersun, and Sunny makes sure your home can handle what's next.

Schedule My Assessment

$119 consultation, credited toward same-day approved work · Real heroes think ahead.

All calculations are estimates based on Austin Energy avg rates ($0.155/kWh), national appliance data, and Supersun's installed pricing.
Actual results vary by home. Schedule a consultation for a precise evaluation.

Supersun Electric · TECL #39536
Licensed and Regulated by the Texas Department of Licensing & Regulation (TDLR)
P.O. Box 12157, Austin, TX 78711 · 1-800-803-9202 · www.tdlr.texas.gov
By scheduling services or otherwise engaging with Supersun Electric, you agree to our Terms of Service.