Independent Clean Energy Calculators forYour Location
Model real-world performance, grid independence, and financial returns for rooftop solar, home batteries, heat pumps, and EV charging using empirical weather and utility tariff data.
Over 50% Solar Yield Variation Across the US
National rule-of-thumb averages miscalculate solar and heat pump economics. A standard 10 kW residential solar array generates roughly 18,500 kWh/year in sunny Phoenix, AZ, compared to approximately 10,500 kWh/year in Seattle, WA. Over 25 years of operation, this regional variance accounts for tens of thousands of dollars in avoided utility costs and net billing credits.
Hyper-Local Geodata
Automated calibration of solar irradiation, heating degree days, and utility rates by location.
Engineering-Grade Calculations
Physics-based energy modeling without artificial installer markups or inflated claims.
Clear Financial Framework
Evaluate real payback periods, utility bill offsets, and verified public incentive deductions.
⚡Clean Energy Calculators
Select a category for location-calibrated modeling and payback estimates:
Solar & Photovoltaic
Solar yield, payback & battery sizing
Heat Pump
Heating load & energy efficiency
Battery Storage
Capacity, cycles & self-consumption
Grid Independence
Independence from the power grid
Gas & Oil Comparison
Operating cost comparison & ROI
EV Charging & Wallbox
Charging times & home solar charging
📍Regional Clean Energy Hubs
Select a tool focus and choose your city or metropolitan area:
🔬Open Data & Scientific Sources
No sales hype or inflated contractor metrics: Our calculations rely on verified public energy and meteorological databases:
Solar Irradiance Datasets
Satellite-derived Global Horizontal and Direct Normal Irradiance from the National Renewable Energy Laboratory.
Heating Degree Days (HDD)
Multi-decade temperature baselines and heating degree day calculations to determine residential seasonal thermal load.
Utility Tariff Rates
Empirical residential rate schedules from regional investor-owned and municipal utilities nationwide.
Performance Standards
Inverter efficiency modeling, battery degradation curves, and standard residential load profiles.
❓Frequently Asked Questions
Essential details on our data sources, mathematical models, and calculation standards:
Is GridKalk completely free to use?▼
Does GridKalk sell my contact information to solar installers?▼
Are GridKalk calculation models vendor-neutral?▼
What happens to my location and house data?▼
Do I need to sign up or create an account?▼
Where do the solar irradiance and climate data come from?▼
How does combining rooftop solar, battery storage, and heat pumps impact utility bills?▼
Suggestion or Feature Request?
Are you missing a specific calculation, regional metric, or feature? We welcome any feedback to improve the platform.
Report an Issue
Did you spot a calculation discrepancy, incorrect location data, or a broken link? Let us know directly so we can fix it immediately.
