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WattQuick Tool Suite
Professional power calculators for batteries, solar & EV
Engineering-grade results with minimal inputs. No sign-up, no submit buttons — open a tool, type, and get answers in milliseconds.
- Ah to Wh ConverterConvert amp-hours to watt-hours using battery voltage.
- Wh to Ah ConverterConvert watt-hours to amp-hours using system voltage.
- kVA to kW ConverterConvert apparent power (kVA) to real power (kW) using power factor.
- Conductor Resistance & Te…Calculate copper or aluminum conductor resistance from cross-section, length, and operating temperature.
- Reactive Power & Power Fa…Convert kVA to real kW and reactive kVAR for motor and driver loads—plan inverter and conductor sizing.
- Battery DoD to Energy YieldConvert nominal battery capacity and depth of discharge to usable kWh for backup and critical-load planning.
- kW to HP ConverterConvert kilowatts to mechanical horsepower instantly.
- Watts to AmpsConvert electrical power (watts) to current (amps) at a given voltage.
- Amps to WattsConvert current (amps) and voltage into power (watts).
- Residential AC Voltage DropCalculate AC voltage drop in home wiring from supply voltage, amps, cable length (m), and AWG or mm² copper size.
- Battery PercentageFind remaining charge as a percentage of full capacity.
- Battery RuntimeEstimate how long a battery lasts at a given power draw.
- Battery Charging TimeCalculate how long it takes to charge a battery at a given current.
- Battery Bank Size (Ah)Size a battery bank in amp-hours from load, runtime, and voltage.
- Solar Panel SizeEstimate minimum panel wattage from daily energy use and sun hours.
- Solar Daily YieldEstimate daily energy output from panel wattage and sun hours.
- Solar Battery Bank SizeSize an off-grid battery bank from daily use and backup days.
- EV Charging CostEstimate home charging cost from energy used and your utility rate.
- EV Charge TimeEstimate how long an EV charge takes at a given charger power.
- Appliance Daily CostCalculate daily electricity cost for any appliance from watts and runtime.
- Appliance Monthly EnergyConvert appliance watts and daily use into monthly kWh.
- Inverter SizingFind minimum inverter size from peak load and safety margin.
- Battery Cost EstimatorEstimate pack cost from capacity, voltage, and price per watt-hour.
- UPS RuntimeEstimate backup time from battery energy and load power.
- Ohm's LawFind voltage, current, or resistance when you know any two values (V = I × R).
- Volts to WattsConvert voltage and current into electrical power in watts.
- Watts to VoltsFind voltage from power and current (V = W ÷ A).
- Power FactorCalculate power factor from real power (kW) and apparent power (kVA).
- Energy ConsumptionEstimate total kWh from watts, hours per day, and number of days.
- Battery EnergyCalculate battery energy in watt-hours from amp-hours and voltage.
- Battery Depth of DischargeCalculate how much of a battery's capacity has been used (DoD %).
- Battery EfficiencyCalculate round-trip efficiency from energy out and energy in.
- Solar Charge Controller SizeEstimate minimum charge controller amperage from panel watts and system voltage.
- Solar Inverter EfficiencyCalculate inverter efficiency from AC output and DC input power.
- Solar Array CurrentEstimate array current from total panel watts and system voltage.
- Solar Panel TiltRecommended panel tilt angle based on your latitude (year-round estimate).
- EV Cost Per MileEstimate driving cost from electricity rate and energy used per mile.
- EV Battery RangeEstimate driving range from battery size, efficiency, and consumption.
- Level 1 vs Level 2 EV Cha…Compare how long the same charge takes on Level 1 and Level 2 home charging.
- Electricity Bill EstimatorEstimate your bill from total kWh usage and rate per kWh.
- Electric Heater CostEstimate heating cost from wattage, run hours, days, and electricity rate.
- Air Conditioner Energy CostEstimate monthly AC electricity cost from watts, daily hours, and rate.
- Refrigerator Energy UsageEstimate refrigerator kWh and cost from wattage and electricity rate.
- DC Cable SizeRecommend DC wire gauge from current, one-way length, and system voltage.
- AC Inrush Current LimitFind nominal amps, peak motor inrush, and recommended breaker size with B/C/D curve guidance.
- EV vs ICE Maintenance CostCompare scheduled maintenance for EV vs. gas cars over 5–10 years, including optional battery replacement risk.
- EV DC Fast Charging(10–80%)Estimate DC fast-charge time with taper above 80% SOC—live as you adjust pack size and charger power.
- EV Charging Temperature I…See how extreme cold or heat extends DC fast-charge time via BMS thermal limits—base 10–80% time plus added delay.
- EV Winter Range LossEstimate cold-weather driving range from EPA rating, temperature, and cabin heat use.
- EV vs. Gas Car SavingsCompare monthly and yearly fuel costs between gasoline and electric driving.
- EV Battery Health & Degra…Rough state-of-health estimate from age, mileage, and DC fast-charging habits.
- EV Battery Depletion & Va…Estimate battery SoH from age, mileage, and DC fast-charging habits—then convert capacity fade to dollar value lost and resale value.
- EV Public Charging & Idle…Total session cost including energy, connection fee, and idle penalties—updates live.
- EV Battery Pre-conditioni…Estimate electricity cost to heat or cool your pack before DC fast charging—from BMS draw, runtime, and your kWh rate.
- EV Tire Wear CostEstimate annual tire depreciation for electric vehicles vs. comparable gas cars—km driven, set cost, ICE tire life, and EV wear factor.
- EV Charging Cable Power LossEstimate I²R heat loss in copper charging cables from amps, length, mm² cross-section, and session hours.
- EV Battery State of Charg…Estimate EV pack state of charge from resting voltage using configurable empty and full voltage endpoints.
- Solar Panel Roof SpaceEstimate how many panels fit on your roof and total system size in kW—updates live.
- Solar Payback Period (ROI)Estimate payback time and 25-year savings from system cost, production, and electricity rates.
- Solar Panel Angle & Tilt …Optimal tilt and azimuth from latitude and season—fixed, summer, or winter mounting.
- Grid-Tie Net MeteringCompare monthly bills with solar: self-use, export credits, and grid imports.
- Solar Panel DegradationEstimate remaining annual output and capacity after years of panel degradation.
- Off-Grid Generator vs. So…Compare 5- and 10-year cumulative costs of diesel generator-only power vs. a solar+battery hybrid—and estimate annual savings.
- Generator Run-Time SavingsEstimate daily engine hours saved with a solar+battery hybrid, maintenance dollars avoided, and longer generator life.
- Water Pump Solar SizingSize a solar array for irrigation or well pumps—kWp, panel count, and MPPT guidance from pump watts, run hours, lift, and peak sun.
- DC Cable Size & Voltage DropSize copper DC homeruns from panels to charge controller—minimum mm² / AWG for amp load, length in meters, and max voltage drop.
- Solar System Degradation …Model 20 years of declining PV output, rising electricity rates, cumulative savings, and break-even with annual degradation.
- Solar Shading AnalysisEstimate annual kWh and dollar loss from partial shading on string inverters vs module optimizers.
- Solar ROI AnalysisAdvanced 20-year solar payback with degradation, rate inflation, export credits, incentives, and cumulative savings vs. status quo.
- Battery Series & ParallelCalculate pack voltage, amp-hours, and watt-hours from series/parallel cell layout.
- Battery C-RateFind discharge C-rate and runtime from capacity and load current—updates live.
- Inverter LossConvert DC input watts to AC output and show power lost as heat in the inverter.
- Inverter Peak Load & SurgeSum motor running watts and staggered surge demand—get continuous load, peak W, and a recommended pure-sine inverter tier.
- Inverter Loading CurveEstimate overload shutdown time from nominal power, current load, ambient temperature, and manufacturer overload curves.
- Home Backup Battery SizingSize a backup battery bank for essential loads, runtime, voltage, and depth of discharge.
- Battery Voltage DropEstimate DC wire voltage drop and voltage at the load from amps, length, and system voltage.
- Battery Calendar AgingEstimate Li-ion capacity fade from storage temperature, average SOC, and pack age—calendar loss % and remaining SoH.
- BESS ROI(Battery Energy S…See if adding battery storage to existing solar pays back from peak vs. off-peak TOU arbitrage—daily savings, payback years, and LCOS.
- Critical Load AnalysisPlan home backup power by listing essential devices, daily runtime, and target outage hours.
- Crypto Mining PowerEstimate kWh and electricity cost for GPU/ASIC rigs by wattage and run hours.
- Vampire Power CostEstimate yearly electricity cost for TVs, chargers, and other devices drawing power in standby.
- Standby Power WasteQuantify phantom load cost from devices left plugged in 24/7 on standby.
- Generator Fuel ConsumptionEstimate fuel use per hour and runtime from tank size at your load level.
- Heat Pump vs. Resistance …Compare electric heating cost: resistance strips (COP 1) vs. heat pump COP.
- Whole House Energy BudgetSum daily kWh by category and estimate monthly and annual electricity cost.
- Lighting Circuit LoadSum fixture watts, compute circuit amps, and check breaker utilization against the 80% continuous-load guideline.
- AC Efficiency & Inverter …Compare on/off vs. inverter air conditioner monthly electricity cost, energy savings, and purchase payback period.
- Pool Energy Cost & Therma…Pool pump and heating cost by technology (resistance vs. heat pump COP) plus thermal cover savings on evaporation load.
- EV Truck Range vs. PayloadEstimate how cargo weight reduces electric truck range from rated empty miles.
- EV Fleet TCO vs. GasCompare annual fuel energy cost for gas and electric fleets by mileage.
- Transit Bus Battery kWh p…Calculate energy intensity from route miles and metered kWh use.
- Electric Forklift Shift R…Estimate shift hours from industrial battery Ah, voltage, and average load amps.
- Delivery Van Stop-and-Go …Model urban kWh/mile from highway baseline and stops per mile.
- RV Solar & House BatteryMatch rooftop panel yield to daily 12V/24V loads and bank Ah shortfall.
- Marine Trolling Motor Run…Continuous amp draw vs. bank Ah for trolling and house loads.
- Portable Power Station Re…Compare wall AC, car 12V, and solar MPPT hours to refill Wh capacity.
- 12V to 120V Inverter Load…Check continuous and surge loads against inverter ratings.
- 12V Camping Fridge RuntimeAmbient temperature effect on compressor duty cycle and battery days.
- Time-of-Use Load Shifting…Savings from moving kWh from peak to off-peak rate periods.
- Commercial Demand ChargeMonthly penalty from peak kW demand and $/kW tariff.
- V2G Grid Buyback RevenueEstimate monthly revenue from bidirectional EV export at utility buyback rates.
- Home Battery Arbitrage ROIProfit from charging on cheap night rates and discharging at peak.
- Solar & EV Carbon Offsetkg CO₂ avoided from clean kWh vs. grid emissions factor.
- Grid Frequency Response R…Estimate monthly and annual revenue from battery or DER frequency-response programs—capacity kW, participation hours, and availability.
- Peak Shaving PotentialEstimate monthly and annual TOU savings from shifting peak kWh to off-peak—compare bills before and after load shifting.
- Electricity Rate Plan(TOU…Compare flat-rate vs. time-of-use monthly bills from your kWh split and peak, shoulder, and off-peak tariffs—see annual savings.
- Building Heat Loss & Insu…Estimate heat loss watts from envelope area, ΔT, and R-value.
- Home Insulation SavingsEstimate annual heating and cooling savings from upgrading wall insulation and windows—before/after energy use and efficiency score.
- LED Savings & ROICompare legacy bulb vs. LED costs, CO₂ savings, and payback time for a single fixture.
- LED vs. Incandescent ROIEnergy and bulb replacement savings when matching lumens with lower watts.
- Smart Thermostat SavingsHVAC kWh reduction from setback schedules and seasonal rates.
- Window Solar Heat Gain (S…Cooling load from glazing SHGC, area, and sun exposure.
- Microgrid ROIBreak-even timeline and 10–20 year returns for solar, storage, and on-site generation microgrids.
- BESS Round-trip Carbon CostEstimate annual kg CO₂ from battery round-trip conversion losses and compare grid charging vs. renewable charging.
- Solar Water Heater Effici…Estimate thermal efficiency, absorbed kWh, and electric heating savings from tank volume, ΔT, sun hours, and collector area.
- Small Wind Turbine YieldEstimate rotor power (W), daily kWh, and annual energy from blade diameter, average wind speed, and system efficiency.
- Standby Power AggregatorAdd TVs, chargers, consoles, and adapters to see total vampire power cost and what you could buy instead.
- E-Bike Range EstimatorPhysics-based range estimate from battery Wh, assist level, rider weight, and wind/terrain factors.
- E-Bike Full Charge CostCalculate the cost of a full battery charge from pack capacity and your home electricity rate.
- E-Bike Max SpeedEstimate theoretical top speed from battery voltage, motor KV rating, and wheel diameter.
- E-Bike Charge TimeEstimate 0–100% charge duration from pack capacity, charger wattage, and charge efficiency.
- E-Bike Battery C-RatingCheck whether your pack can safely deliver the continuous current your motor demands.
- E-Bike Voltage SagCalculate dynamic voltage sag from cell resistance, S×P pack layout, and max controller current.
- E-Bike Weight vs PerformanceSee how total mass (rider + bike + cargo) and terrain affect energy use and range.
- E-Bike Commute SavingsCompare annual commuting cost: e-bike electricity vs car per-km vs public transit fares.
- E-Bike Controller Amps to…Convert controller current draw to motor input and shaft power at different battery voltages.
- E-Bike Battery Cycle LifeEstimate remaining cycle life using k × DOD⁻¹·⁵ decay and manufacturer 80% SOH ratings.
- E-Scooter RangeEstimate remaining range with SOC slider, tyre pressure, and voltage sag at 36 / 48 / 52 V.
- E-Scooter Tyre Pressure &…See how under-inflation on 8–10″ wheels raises Wh/km and cuts range.
- E-Scooter Max SpeedTheoretical top speed from voltage, motor KV, and wheel diameter.
- E-Scooter Hill Climb GradeMaximum climb grade with dynamic SOC (20–100 %) and voltage sag torque drop at 36 / 48 / 52 V.
- E-Scooter Tyre Wear LifeEstimate tread life in km and weeks from weekly distance and surface type.
- E-Scooter Charge TimeCompare 2 A / 3 A / 4 A charger times for typical 36 V and 48 V packs.
- E-Scooter Cost per kmElectricity cost per km versus public transit for commute planning.
- E-Scooter Rider Weight LimitStress factor on motor and deck when exceeding rated rider mass.
- E-Scooter Peak Discharge …Check acceleration peaks against controller and pack C-rating.
- E-Scooter Brake Pad WearPad life in km from regen share, hill riding, and weekly distance.
- E-Scooter Connector Power…I²R heat at XT30/XT60/XT90 pairs under ride and charge current.
- E-Scooter Maintenance Sch…Km and weeks until tyre, brake, and bolt-torque service intervals.
- Mobility TCOCompare 3-year total cost of ownership: car vs e-bike vs e-scooter for commuting and urban mobility.