⚡ GridLoadCalc

Complete Directory of Open Engineering Calculators

Browse all 240 programmatic tools, regulatory benchmarks (UL 3700, UK SI 2026/848, NEC 220.83 & 625.42), vehicle-specific panel worksheets, and utility tariff arbitrage models without email gates or sales calls.

⚡ Core Engineering Calculators & Guides

Plug-in Solar ROI Calculator

800W–1200W UL 3700 & G98 payback across US states and Great Britain.

100A Panel EV Load Calculator

NEC 220.83 existing dwelling calculations and NEC 625.42 EVEMS load management.

Battery TOU Arbitrage Calculator

Model peak shaving and solar shifting on PG&E, SCE, SDG&E, ConEd & Octopus UK.

Engineering Blog & Code Guides

Deep-dive technical guides on electrical codes and regulatory enactments.

⚡ 100A & 125A Electrical Panel EV Load Worksheets by State & Vehicle (130 Pages)

California (US) NEC 220.83 Worksheets

100A Main Panel Tesla Model Y / Model 3 125A Main Panel Tesla Model Y / Model 3 100A Main Panel Ford F-150 Lightning 125A Main Panel Ford F-150 Lightning 100A Main Panel Rivian R1S & R1T 125A Main Panel Rivian R1S & R1T 100A Main Panel Hyundai Ioniq 5 & Kia EV9 125A Main Panel Hyundai Ioniq 5 & Kia EV9 100A Main Panel Chevy Equinox EV & Blazer EV 125A Main Panel Chevy Equinox EV & Blazer EV

Utah (US) NEC 220.83 Worksheets

100A Main Panel Tesla Model Y / Model 3 125A Main Panel Tesla Model Y / Model 3 100A Main Panel Ford F-150 Lightning 125A Main Panel Ford F-150 Lightning 100A Main Panel Rivian R1S & R1T 125A Main Panel Rivian R1S & R1T 100A Main Panel Hyundai Ioniq 5 & Kia EV9 125A Main Panel Hyundai Ioniq 5 & Kia EV9 100A Main Panel Chevy Equinox EV & Blazer EV 125A Main Panel Chevy Equinox EV & Blazer EV

Virginia (US) NEC 220.83 Worksheets

100A Main Panel Tesla Model Y / Model 3 125A Main Panel Tesla Model Y / Model 3 100A Main Panel Ford F-150 Lightning 125A Main Panel Ford F-150 Lightning 100A Main Panel Rivian R1S & R1T 125A Main Panel Rivian R1S & R1T 100A Main Panel Hyundai Ioniq 5 & Kia EV9 125A Main Panel Hyundai Ioniq 5 & Kia EV9 100A Main Panel Chevy Equinox EV & Blazer EV 125A Main Panel Chevy Equinox EV & Blazer EV

Colorado (US) NEC 220.83 Worksheets

100A Main Panel Tesla Model Y / Model 3 125A Main Panel Tesla Model Y / Model 3 100A Main Panel Ford F-150 Lightning 125A Main Panel Ford F-150 Lightning 100A Main Panel Rivian R1S & R1T 125A Main Panel Rivian R1S & R1T 100A Main Panel Hyundai Ioniq 5 & Kia EV9 125A Main Panel Hyundai Ioniq 5 & Kia EV9 100A Main Panel Chevy Equinox EV & Blazer EV 125A Main Panel Chevy Equinox EV & Blazer EV

New Jersey (US) NEC 220.83 Worksheets

100A Main Panel Tesla Model Y / Model 3 125A Main Panel Tesla Model Y / Model 3 100A Main Panel Ford F-150 Lightning 125A Main Panel Ford F-150 Lightning 100A Main Panel Rivian R1S & R1T 125A Main Panel Rivian R1S & R1T 100A Main Panel Hyundai Ioniq 5 & Kia EV9 125A Main Panel Hyundai Ioniq 5 & Kia EV9 100A Main Panel Chevy Equinox EV & Blazer EV 125A Main Panel Chevy Equinox EV & Blazer EV

Maryland (US) NEC 220.83 Worksheets

100A Main Panel Tesla Model Y / Model 3 125A Main Panel Tesla Model Y / Model 3 100A Main Panel Ford F-150 Lightning 125A Main Panel Ford F-150 Lightning 100A Main Panel Rivian R1S & R1T 125A Main Panel Rivian R1S & R1T 100A Main Panel Hyundai Ioniq 5 & Kia EV9 125A Main Panel Hyundai Ioniq 5 & Kia EV9 100A Main Panel Chevy Equinox EV & Blazer EV 125A Main Panel Chevy Equinox EV & Blazer EV

Connecticut (US) NEC 220.83 Worksheets

100A Main Panel Tesla Model Y / Model 3 125A Main Panel Tesla Model Y / Model 3 100A Main Panel Ford F-150 Lightning 125A Main Panel Ford F-150 Lightning 100A Main Panel Rivian R1S & R1T 125A Main Panel Rivian R1S & R1T 100A Main Panel Hyundai Ioniq 5 & Kia EV9 125A Main Panel Hyundai Ioniq 5 & Kia EV9 100A Main Panel Chevy Equinox EV & Blazer EV 125A Main Panel Chevy Equinox EV & Blazer EV

Maine (US) NEC 220.83 Worksheets

100A Main Panel Tesla Model Y / Model 3 125A Main Panel Tesla Model Y / Model 3 100A Main Panel Ford F-150 Lightning 125A Main Panel Ford F-150 Lightning 100A Main Panel Rivian R1S & R1T 125A Main Panel Rivian R1S & R1T 100A Main Panel Hyundai Ioniq 5 & Kia EV9 125A Main Panel Hyundai Ioniq 5 & Kia EV9 100A Main Panel Chevy Equinox EV & Blazer EV 125A Main Panel Chevy Equinox EV & Blazer EV

Vermont (US) NEC 220.83 Worksheets

100A Main Panel Tesla Model Y / Model 3 125A Main Panel Tesla Model Y / Model 3 100A Main Panel Ford F-150 Lightning 125A Main Panel Ford F-150 Lightning 100A Main Panel Rivian R1S & R1T 125A Main Panel Rivian R1S & R1T 100A Main Panel Hyundai Ioniq 5 & Kia EV9 125A Main Panel Hyundai Ioniq 5 & Kia EV9 100A Main Panel Chevy Equinox EV & Blazer EV 125A Main Panel Chevy Equinox EV & Blazer EV

New Hampshire (US) NEC 220.83 Worksheets

100A Main Panel Tesla Model Y / Model 3 125A Main Panel Tesla Model Y / Model 3 100A Main Panel Ford F-150 Lightning 125A Main Panel Ford F-150 Lightning 100A Main Panel Rivian R1S & R1T 125A Main Panel Rivian R1S & R1T 100A Main Panel Hyundai Ioniq 5 & Kia EV9 125A Main Panel Hyundai Ioniq 5 & Kia EV9 100A Main Panel Chevy Equinox EV & Blazer EV 125A Main Panel Chevy Equinox EV & Blazer EV

New York (US) NEC 220.83 Worksheets

100A Main Panel Tesla Model Y / Model 3 125A Main Panel Tesla Model Y / Model 3 100A Main Panel Ford F-150 Lightning 125A Main Panel Ford F-150 Lightning 100A Main Panel Rivian R1S & R1T 125A Main Panel Rivian R1S & R1T 100A Main Panel Hyundai Ioniq 5 & Kia EV9 125A Main Panel Hyundai Ioniq 5 & Kia EV9 100A Main Panel Chevy Equinox EV & Blazer EV 125A Main Panel Chevy Equinox EV & Blazer EV

Texas (US) NEC 220.83 Worksheets

100A Main Panel Tesla Model Y / Model 3 125A Main Panel Tesla Model Y / Model 3 100A Main Panel Ford F-150 Lightning 125A Main Panel Ford F-150 Lightning 100A Main Panel Rivian R1S & R1T 125A Main Panel Rivian R1S & R1T 100A Main Panel Hyundai Ioniq 5 & Kia EV9 125A Main Panel Hyundai Ioniq 5 & Kia EV9 100A Main Panel Chevy Equinox EV & Blazer EV 125A Main Panel Chevy Equinox EV & Blazer EV

United Kingdom (England, Scotland & Wales) (UK) NEC 220.83 Worksheets

100A Main Panel Tesla Model Y / Model 3 125A Main Panel Tesla Model Y / Model 3 100A Main Panel Ford F-150 Lightning 125A Main Panel Ford F-150 Lightning 100A Main Panel Rivian R1S & R1T 125A Main Panel Rivian R1S & R1T 100A Main Panel Hyundai Ioniq 5 & Kia EV9 125A Main Panel Hyundai Ioniq 5 & Kia EV9 100A Main Panel Chevy Equinox EV & Blazer EV 125A Main Panel Chevy Equinox EV & Blazer EV

☀️ Plug-in & Balcony Solar State & Hardware Guides (65 Pages)

California State Guide (1200W) → US

Passed Legislature (SB 868 — Awaiting Governor Signature, Sept 2026)

Anker SOLIX 800W EcoFlow 800W Anker SOLIX 6000W EcoFlow 7200W
Utah State Guide (1200W) → US

Legalized in Law (Utah HB 340 — Up to 1,200W)

Anker SOLIX 800W EcoFlow 800W Anker SOLIX 6000W EcoFlow 7200W
Virginia State Guide (1200W) → US

Legalized in Law (2026 Balcony Solar Act — Up to 1,200W)

Anker SOLIX 800W EcoFlow 800W Anker SOLIX 6000W EcoFlow 7200W
Colorado State Guide (1200W) → US

Legalized in Law (2026 Plug-in Solar Law — Up to 1,200W)

Anker SOLIX 800W EcoFlow 800W Anker SOLIX 6000W EcoFlow 7200W
New Jersey State Guide (1200W) → US

Legalized in Law (2026 Balcony Solar Act — Up to 1,200W)

Anker SOLIX 800W EcoFlow 800W Anker SOLIX 6000W EcoFlow 7200W
Maryland State Guide (1200W) → US

Legalized in Law (2026 Plug-in Solar Act — Up to 1,200W)

Anker SOLIX 800W EcoFlow 800W Anker SOLIX 6000W EcoFlow 7200W
Connecticut State Guide (1200W) → US

Legalized in Law (2026 Plug-in Solar Act — Up to 1,200W)

Anker SOLIX 800W EcoFlow 800W Anker SOLIX 6000W EcoFlow 7200W
Maine State Guide (1200W) → US

Legalized in Law (2026 Plug-in Solar Act — Up to 1,200W)

Anker SOLIX 800W EcoFlow 800W Anker SOLIX 6000W EcoFlow 7200W
Vermont State Guide (1200W) → US

Legalized in Law (2026 Plug-in Solar Act — Up to 1,200W)

Anker SOLIX 800W EcoFlow 800W Anker SOLIX 6000W EcoFlow 7200W
New Hampshire State Guide (1200W) → US

Legalized in Law (2026 Plug-in Solar Act — Up to 1,200W)

Anker SOLIX 800W EcoFlow 800W Anker SOLIX 6000W EcoFlow 7200W
New York State Guide (800W) → US

Zero-Export Battery Mode Recommended (Pending State Bill)

Anker SOLIX 800W EcoFlow 800W Anker SOLIX 6000W EcoFlow 7200W
Texas State Guide (1200W) → US

Zero-Export / Free-Nights TOU Arbitrage Ready

Anker SOLIX 800W EcoFlow 800W Anker SOLIX 6000W EcoFlow 7200W
United Kingdom (England, Scotland & Wales) State Guide (800W) → UK

Officially Legalized Aug 27, 2026 (SI 2026/848 — Up to 800W)

Anker SOLIX 800W EcoFlow 800W Anker SOLIX 6000W EcoFlow 7200W

🔋 Utility Time-of-Use & NEM 3.0 Battery Arbitrage (35 Pages)

PG&E (Pacific Gas & Electric) — E-TOU-C / E-ELEC Tariff Model → 4:00 PM – 9:00 PM

Off-Peak: $0.38/kWh · Peak: $0.56/kWh · Spread: $0.18/kWh

Anker SOLIX (1.6 kWh) EcoFlow (2 kWh) Anker SOLIX (3.84 kWh) EcoFlow (6.1 kWh)
SCE (Southern California Edison) — TOU-D-Prime Tariff Model → 4:00 PM – 9:00 PM

Off-Peak: $0.25/kWh · Peak: $0.59/kWh · Spread: $0.34/kWh

Anker SOLIX (1.6 kWh) EcoFlow (2 kWh) Anker SOLIX (3.84 kWh) EcoFlow (6.1 kWh)
SDG&E (San Diego Gas & Electric) — TOU-DR1 / EV-TOU-5 Tariff Model → 4:00 PM – 9:00 PM

Off-Peak: $0.16/kWh · Peak: $0.68/kWh · Spread: $0.52/kWh

Anker SOLIX (1.6 kWh) EcoFlow (2 kWh) Anker SOLIX (3.84 kWh) EcoFlow (6.1 kWh)
Con Edison (New York City & Westchester) — Residential TOU Tariff Model → 8:00 AM – 12:00 AM (Summer Peak)

Off-Peak: $0.15/kWh · Peak: $0.41/kWh · Spread: $0.26/kWh

Anker SOLIX (1.6 kWh) EcoFlow (2 kWh) Anker SOLIX (3.84 kWh) EcoFlow (6.1 kWh)
Eversource (Connecticut & New England) — Residential Rate 1 / TOU Tariff Model → 12:00 PM – 8:00 PM

Off-Peak: $0.21/kWh · Peak: $0.39/kWh · Spread: $0.18/kWh

Anker SOLIX (1.6 kWh) EcoFlow (2 kWh) Anker SOLIX (3.84 kWh) EcoFlow (6.1 kWh)
Rocky Mountain Power (Utah) — Schedule 2E Time-of-Use Tariff Model → 3:00 PM – 8:00 PM

Off-Peak: $0.08/kWh · Peak: $0.26/kWh · Spread: $0.18/kWh

Anker SOLIX (1.6 kWh) EcoFlow (2 kWh) Anker SOLIX (3.84 kWh) EcoFlow (6.1 kWh)
Octopus Energy UK — Intelligent Octopus Go & Octopus Flux Tariff Model → 4:00 PM – 7:00 PM

Off-Peak: £0.075/kWh · Peak: £0.39/kWh · Spread: £0.32/kWh

Anker SOLIX (1.6 kWh) EcoFlow (2 kWh) Anker SOLIX (3.84 kWh) EcoFlow (6.1 kWh)

📚 Engineering Articles & Electrical Code Guides (4 Articles)

Engineering Guide 2026-09-26

2026 Home Electrification Guide: UL 3700 Plug-in Solar & NEC 220.83 100A Panel Load Calculations

Breakdown of 2026 electrification codes: how UL 3700 balcony solar and NEC 625.42 EVEMS avoid a $3,500 service upgrade on 100A panels.
Solar Policy & Engineering 2026-10-25

California SB 868 Plug-and-Play Solar Act: What Homeowners & Renters Need to Know

California SB 868 guide: 1,200W standard 120V plug-in solar limits, UL 3700 safety certification, NEM 3.0 avoidance, and tenant protections.
UK Battery & Tariff Analysis 2026-10-25

Intelligent Octopus Flux vs Octopus Go: 2026 UK Home Battery ROI & SI 2026/848

UK SI 2026/848 & Octopus Energy Time-of-Use tariffs: how homeowners generate £450–£850 annual bill savings using 800W G98 solar and LFP batteries.
Electrical Code & EV Infrastructure 2026-10-25

Avoid a $3,500 200A Panel Upgrade: NEC 625.42 EVEMS & NEC 220.83 Calculations

How to install a 40A/48A Level 2 EV charger on a 100A main electrical panel using NEC 625.42 EVEMS to avoid an expensive 200A service upgrade.