Connected Energy Planning & Engineering
Transparent physical loss models built on applicable IEEE and NFPA 70 (NEC) requirements, plus NREL and SAE technical references. Calculation inputs are processed in your browser.
Monthly & annual kWh solar production with tilt & PVWatts physical loss modeling.
Hourly, monthly & seasonal cooling costs by BTU, SEER2 rating, and climate zone.
Estimated backup duration for home loads, LiFePO4, AGM, and applicable Peukert derating.
Range decay modeling under 70+ mph highway speed, cold winter temps, and HVAC loads.
Fast-Track Planning
Size home batteries & UPS runtime for emergency power.
Calculate daily appliance loads, panel counts & battery banks.
Audit high-draw appliances & calculate utility bill costs.
Calculate charging speeds, costs & annual fuel savings vs gas.
Size portable power stations & 12V LiFePO4 battery runtime.
Find a recommended starting tilt angle for your latitude and roof pitch.
Calculate running & starting surge watts for emergency backup.
Calculate central AC, mini-split & window unit costs per hour and month.
Calculate highway range drops from 75 mph speed & cold winter temperatures.
Calculate break-even years, utility inflation & lifetime savings.
Connected Energy Planning Tools
Your electrical devices, solar production, battery storage, and EV charging are connected in one continuous energy flow:
Audit appliance wattage, schedule duty cycles, and calculate continuous vs peak running power.
Size solar panel arrays, optimize tilt angles, and model PVWatts location-aware solar insolation.
Store daytime solar generation or size whole-home battery backup banks for grid blackout protection.
Calculate charging duration, home vs public electricity costs, real-world range, and gas savings.
Complete Engineering Suite
Explore our full calculators directory, reference our engineering standards, or embed tools via developer widgets:
Estimate EV charging time from battery capacity, charge level and charger power.
Estimate EV charging cost from usable battery energy, driving consumption and your electricity price.
Estimate planned EV range from usable battery capacity, charge level, reserve and energy consumption.
Compare EV electricity cost with combustion-vehicle fuel cost for the same annual distance.
Estimate daily, monthly and annual electricity use from appliance power, schedules or energy-label values.
Estimate an electricity bill from your usage, electricity price and optional fixed or standing charges.
Find a practical starting panel angle from your latitude, with optional roof-orientation comparison.
Estimate monthly and annual solar production for your location using system size and PVWatts assumptions.
Estimate stored-energy capacity for a solar battery bank from daily load, autonomy and editable planning assumptions.
Estimate daily appliance energy from watts, schedules, duty-cycle assumptions and essential-load planning.
Estimate solar system size and panel count from your energy target, panel wattage and modeled solar yield.
Estimate how long a battery can power a device or group of appliances.
Estimate the battery capacity needed for a load and backup time, with reserve, efficiency and planning assumptions.
Estimate how long a UPS can support your equipment from battery energy and load watts.
Calculate the nominal UPS battery energy and Ah needed for a load and backup time.
Convert Ah, mAh, Wh and kWh using voltage, then estimate usable battery energy.
Estimate charging time from battery capacity, state of charge and charger output.
Estimate home battery capacity from household energy, backup scope and outage duration.
Estimate portable power station runtime or the capacity needed for a target runtime, with continuous and surge checks.
Estimate running watts from an appliance preset or label, then calculate energy use for a selected runtime.
Calculate DC and AC wire gauge sizing, voltage drop percentage, and power loss in watts under NEC standards.
Calculate generator running and starting wattage requirements for storm outages and emergency backup.
Calculate solar break-even timeline in years, 25-year net profit, and return on investment without lead-gen forms.
Calculate hourly, monthly, and seasonal electricity costs for window AC, mini-splits, and central cooling.
Calculate electricity costs per hour, per 8-hour night, and per winter month for electric space heaters.
Compare annual operating costs between heat pumps, natural gas, propane, and fuel oil furnaces.
Size MPPT and PWM charge controllers by amperage and cold-weather array voltage (Voc).
Calculate continuous and surge inverter wattage, DC battery amperage, fuse rating, and cable gauge.
Calculate how many days your EV can power essential home appliances during an electrical blackout.
Find the exact circuit breaker size, wire gauge (AWG), and charging speed for your Level 2 EV charger.
Open Educational Resources & Research
Deterministic service panel backfeed calculations under NFPA 70-2023. Includes 100A–400A busbar derating tables, continuous duty 125% math, and interactive simulator.
Calculate & Read Guide→Empirical residential electricity analysis based on EIA benchmarks. Square-footage tiers, appliance duty cycles, and daily kWh formula modeling.
Read Guide & Calculate→Engineering guide to sizing solar charge controllers. Continuous charging amperage, sub-zero Voc voltage expansion, and MPPT efficiency gains.
Read Guide & Calculate→Engineered for Accuracy & Integrity
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All formulas run client-side with transparent electrical losses, temperature derating, and editable reserves.
Solar calculations use NREL PVWatts V8 modeling and NREL solar resource data.
Circuit-sizing calculations reference applicable National Electrical Code (NEC) requirements and relevant IEEE guidance.
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