Engineering Tools & Sizing Directory
Clean Energy Calculators Directory
Explore PowerLab's full suite of deterministic computational models. Calculator engines execute locally in the browser using pure TypeScript without requiring user accounts or server-side saved calculation storage. Each calculator uses the engineering standards, technical references, datasets, or physical models applicable to its calculation domain. Relevant circuit-sizing tools reference applicable NEC provisions and IEEE engineering guidance.
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.
Voltage Drop Calculator
Calculate DC and AC wire gauge sizing, voltage drop percentage, and power loss in watts under NEC standards.
Generator Size Calculator
Calculate generator running and starting wattage requirements for storm outages and emergency backup.
Solar Payback Calculator
Calculate solar break-even timeline in years, 25-year net profit, and return on investment without lead-gen forms.
Air Conditioner Cost Calculator
Calculate hourly, monthly, and seasonal electricity costs for window AC, mini-splits, and central cooling.
Space Heater Cost Calculator
Calculate electricity costs per hour, per 8-hour night, and per winter month for electric space heaters.
Heat Pump Running Cost Calculator
Compare annual operating costs between heat pumps, natural gas, propane, and fuel oil furnaces.
Solar Charge Controller Calculator
Size MPPT and PWM charge controllers by amperage and cold-weather array voltage (Voc).
Inverter Size Calculator
Calculate continuous and surge inverter wattage, DC battery amperage, fuse rating, and cable gauge.
V2L Runtime Calculator
Calculate how many days your EV can power essential home appliances during an electrical blackout.
EV Charger Breaker Size Calculator
Estimate circuit breaker size, conductor size (AWG), and charging capacity using the selected assumptions and applicable NEC references.
Connected Energy Planning Tools
One Connected Energy Planning Suite
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.
Browse Calculators by Discipline
Solar Photovoltaic
Solar array sizing, seasonal tilt angles, PVWatts production yield, and charge controller sizing.
Battery Storage & UPS
Battery runtime with Peukert derating, inverter surge capacity, UPS backup sizing, and wire voltage drop.
Electric Vehicles (EV)
Level 1 and Level 2 charging speeds, circuit breaker sizing, driving range, and vehicle-to-load (V2L) runtime.
Home Energy & Appliances
Household electricity consumption, appliance wattage audits, utility bill analysis, and heating costs.
Specialized NEC Sizing Engines & Technical Tools
View all guides & tools →NEC 705.12 120% Busbar & Main Breaker Derating Calculator
Calculate solar and battery backfeed allowances, simulate 1-click main breaker derating scenarios, and inspect physical busbar opposite-end layouts under NFPA 70 / NEC 705.12(B).
Solar Inverter Clipping & DC-to-AC Ratio Sizing Guide
Evaluate inverter clipping losses, optimal 1.15–1.35 DC/AC oversizing ratios across warm vs cold climates, and grid interconnection considerations referencing IEEE 1547.
Transparent Engineering & Open Models
Why PowerLab Is Designed for Transparency
Physics-Based Calculation Models
Formulas produce reproducible outputs based on the stated physical models, published equations, and user inputs.
Local Browser Processing
Calculator engines execute locally in your browser with zero account requirements and no server-side scenario database.
Documented Technical References
Models cite applicable references including NREL solar resource data, SAE charging protocols, and ASHRAE design conditions.
Applicable Code Context
Relevant circuit-sizing calculations reference applicable National Electrical Code (NEC) provisions and IEEE guidance.