Connected Energy Planning & Engineering
Deterministic Energy Calculators for Solar, Storage, Homes & EVs
Transparent physical loss models with zero database tracking.
Fast-Track Planning
What is your energy project goal?
Blackout & Outage Backup
Size home batteries & UPS runtime for emergency power.
Off-Grid Solar Planning
Calculate daily appliance loads, panel counts & battery banks.
Lower Electric Bills
Audit high-draw appliances & calculate utility bill costs.
EV Charging & Gas Savings
Calculate charging speeds, costs & annual fuel savings vs gas.
Camper Van / Camping Power
Size portable power stations & 12V LiFePO4 battery runtime.
Solar Roof Pitch & Tilt
Find the optimal tilt angle for your latitude and roof pitch.
The Connected Energy Ecosystem
One Unified Energy Planning Architecture
Your electrical devices, solar production, battery storage, and EV charging are connected in one continuous energy flow:
1. Household Electrical Load
Audit appliance wattage, schedule duty cycles, and calculate continuous vs peak running power.
2. Solar PV Generation
Size solar panel arrays, optimize tilt angles, and model PVWatts location-aware solar insolation.
3. Battery Bank & UPS
Store daytime solar generation or size whole-home battery backup banks for grid blackout protection.
4. EV Charging & Transport
Calculate charging duration, home vs public electricity costs, real-world range, and gas savings.
Complete Engineering Suite
All 20 Energy Calculators
Select a category or search below to launch any calculator with prefilled engineering presets:
EV Charging Time Calculator
Estimate EV charging time from battery capacity, charge level and charger power.
EV Charging Cost Calculator
Estimate EV charging cost from usable battery energy, driving consumption and your electricity price.
EV Range Calculator
Estimate planned EV range from usable battery capacity, charge level, reserve and energy consumption.
EV Savings Calculator
Compare EV electricity cost with combustion-vehicle fuel cost for the same annual distance.
Electricity Usage Calculator
Estimate daily, monthly and annual electricity use from appliance power, schedules or energy-label values.
Energy Bill Calculator
Estimate an electricity bill from your usage, electricity price and optional fixed or standing charges.
Solar Panel Tilt Calculator
Find a practical starting panel angle from your latitude, with optional roof-orientation comparison.
Solar Panel Output Calculator
Estimate monthly and annual solar production for your location using system size and PVWatts assumptions.
Solar Battery Bank Size Calculator
Estimate stored-energy capacity for a solar battery bank from daily load, autonomy and editable planning assumptions.
Solar Load Calculator
Estimate daily appliance energy from watts, schedules, duty-cycle assumptions and essential-load planning.
Solar Panel Size Calculator
Estimate solar system size and panel count from your energy target, panel wattage and modeled solar yield.
Battery Runtime Calculator
Estimate how long a battery can power a device or group of appliances.
Battery Size Calculator
Estimate the battery capacity needed for a load and backup time, with reserve, efficiency and planning assumptions.
UPS Runtime Calculator
Estimate how long a UPS can support your equipment from battery energy and load watts.
UPS Battery Size Calculator
Calculate the nominal UPS battery energy and Ah needed for a load and backup time.
Battery Capacity Calculator
Convert Ah, mAh, Wh and kWh using voltage, then estimate usable battery energy.
Battery Charging Time Calculator
Estimate charging time from battery capacity, state of charge and charger output.
Home Battery Size Calculator
Estimate home battery capacity from household energy, backup scope and outage duration.
Portable Power Station Calculator
Estimate portable power station runtime or the capacity needed for a target runtime, with continuous and surge checks.
Appliance Wattage Calculator
Estimate running watts from an appliance preset or label, then calculate energy use for a selected runtime.
Engineered for Accuracy & Integrity
Why Professionals & Homeowners Trust PowerLab
100% Client-Side Privacy
Zero tracking cookies, zero accounts, and zero database logging. Your calculation data stays in your browser.
Deterministic Pure Engines
All formulas run client-side with transparent electrical losses, temperature derating, and editable reserves.
NREL PVWatts V8 Verified
Solar calculations use authentic laboratory irradiance data from the National Renewable Energy Laboratory.
NEC & IEEE Standardized
Safety margins and circuit sizing adhere to National Electrical Code (NEC 690 & 706) and IEEE guidelines.
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