Solar, battery & energy

Home Energy Load PlannerBuild an appliance schedule and separate daily energy from connected running power. Essential Backup Load PlannerChoose outage hours for essential appliances and calculate an AC energy budget. Solar Array Size CalculatorEstimate DC capacity from a daily AC energy target and entered sun hours. Solar Panel Quantity CalculatorRound a target array up to whole panels and inspect the resulting DC capacity. Solar Generation EstimatorEstimate AC energy after separate DC losses and inverter efficiency. Monthly Solar Yield PlannerSupply your own monthly sun hours and day counts for a seasonal production worksheet. Battery Backup Runtime CalculatorEstimate steady AC backup hours from battery energy and an entered load. Required Battery Capacity CalculatorWork backwards from a backup load and duration to nominal battery capacity. Battery Bank Series and Parallel CalculatorInspect ideal bank voltage, amp hours and energy from identical battery modules. Usable Battery Energy CalculatorSeparate nominal stored energy, usable DC energy and estimated AC output. Battery Charging Time EstimatorEstimate ideal bulk equivalent charging time from a state of charge change. Charge Current and C Rate CalculatorCompare entered charge current with capacity and a manufacturer supplied current limit. Inverter Running Load Sizing WorksheetCompare simultaneous running loads with an entered headroom allowance. Watts, VA and Power Factor ConverterConvert real and apparent single phase power using the entered power factor. Motor Starting Load WorksheetCombine one starting appliance with other loads already running. MPPT Output Current WorksheetEstimate battery side controller current from an array power allowance. PV String Limit CheckerCompare a proposed series string against entered cold Voc and hot Vmp limits. PV Series and Parallel Array CalculatorCalculate ideal voltage, current and nameplate power for identical modules. Cold Temperature Voc CalculatorApply a signed module voltage coefficient to a colder module temperature. Hot Temperature Vmp CalculatorInspect the operating voltage reduction under an entered hot cell condition. DC Cable Voltage Drop CalculatorEstimate resistive DC drop in a two conductor circuit from an entered conductor area. Solar Loss Chain CalculatorMultiply successive loss factors and see how each stage changes energy. Roof Panel Footprint PlannerFit modules into an entered rectangular usable area in two orientations. Tilted Panel Row Spacing CalculatorCalculate simple geometric shadow clearance for an entered solar elevation angle. Battery Energy Unit ConverterConvert between voltage and Ah, Wh, kWh and electricity units. Battery Option Comparison WorksheetCompare entered purchase costs per usable cycle and throughput energy. Solar Installation Quote BuilderTotal a manually priced bill of materials in PKR without fetching market rates. Solar Self Consumption and Export Savings CalculatorValue entered solar use and exports without assuming a current utility tariff. Solar Simple Payback CalculatorCompare an entered capital outlay with annual net savings. Solar Lifetime Cashflow WorksheetModel annual savings, degradation, maintenance and a one time replacement. Solar Output Degradation PlannerTrack an entered first year yield under a constant annual reduction. Off Grid Energy and Storage BalanceEstimate array and nominal storage for a daily AC demand and autonomy allowance.