200 professional calculators based on NEC/UL standards
Estimate first-year annual energy production using system capacity, solar resource, and performance
Calculate the power and energy density per unit area for PV system land use planning.
Optimize PV array layout for maximum energy density considering module dimensions, orientation, and
Calculate array spacing
Calculate solar panel production losses from non-optimal azimuth orientation. Compare east, west, an
Calculate PV system capacity factor and equivalent full-load hours from generation data.
Calculate optimal DC/AC ratio for solar inverters. Analyze clipping losses vs. improved low-light pe
Estimate hourly PV generation profile for system sizing and grid integration analysis.
Calculate ground coverage ratio and land utilization for ground-mounted PV arrays.
Calculate optimal row spacing for ground-mounted solar arrays to minimize shading. Factor in latitud
Estimate annual energy loss from horizon obstructions (trees, buildings, terrain) at specified azimu
Calculate the right inverter size for your solar system. Account for continuous loads and surge requ
Calculate optimal string length based on module Voc, Vmp, temperature coefficients, and inverter MPP
Find average peak sun hours for any US state. Essential for accurate solar system sizing.
Calculate minimum inter-row spacing to avoid shading on winter solstice based on tilt, module size,
Score a potential PV site based on solar resource, terrain, grid proximity, and environmental factor
Calculate the percentage of available solar resource reaching the array accounting for shading obstr
Calculate solar angle
Calculate series and parallel solar panel configurations. Find optimal string voltage and current fo
Calculate solar irradiance (kWh/m2/day) based on latitude, season, and panel tilt. Estimate solar en
Calculate the number of solar panels needed based on your energy consumption and location. Free onli
Calculate the optimal solar panel tilt angle based on latitude and season for maximum energy product
Estimate monthly and annual solar irradiance from geographic parameters using clear-sky models.
Calculate how many solar panels fit on your roof. Account for setbacks, obstructions, and panel orie
Calculate specific yield (kWh/kWp) from metered production data and assess system performance agains
Calculate solar panel string voltage considering temperature coefficients. Size strings for inverter
Estimate PV system availability accounting for inverter downtime, grid outages, and scheduled mainte
Calculate optimal solar panel tilt angles for maximum energy production. Compare fixed, seasonal, an
Calculate anti-islanding detection thresholds and trip times per IEEE 1547 for grid-tied inverters.
Size central inverters for utility-scale PV plants based on array capacity, DC/AC ratio, and combine
Design solar PV combiner boxes with proper fusing, voltage ratings, and NEC compliance. Calculate st
Calculate inverter frequency droop response and power curtailment for grid support functions.
Size a grid-forming inverter for microgrid or islanded operation with voltage and frequency regulati
Calculate total harmonic distortion (THD) and individual harmonic levels for PV inverter AC output c
Size a hybrid (battery-coupled) inverter for solar + storage systems based on load, PV capacity, and
Calculate inverter clipping losses based on DC/AC ratio. Optimize oversizing for maximum energy harv
Estimate MPPT tracking losses based on irradiance variability, string mismatch, and tracker algorith
Calculate microinverter requirements for solar panels. Match panel wattage to microinverter capacity
Calculate capacitor bank or inverter reactive power needed to correct power factor at the point of i
Size DC power optimizers for module-level power electronics based on module parameters and string co
Calculate NEC 690.12 rapid shutdown requirements for solar PV systems. Determine MLPE needs and arra
Calculate reactive power capability and power factor for PV inverters providing grid voltage support
Size step-up transformers for PV plants based on inverter output, voltage, and thermal consideration
Configure string inverter MPPT inputs with module strings, checking voltage and current compatibilit
Size surge protective devices (SPDs) for PV systems on both DC and AC sides per NEC 690.35.
Calculate switchgear and circuit breaker ratings for PV interconnection based on fault current and s
Calculate battery bank capacity for off-grid and backup solar systems. Size batteries in Ah and kWh
Calculate charge/discharge C-rate, time to full charge/discharge, and current draw from power demand
Size battery bank capacity based on daily energy demand, autonomy days, depth of discharge, and syst
Calculate expected battery cycle life and replacement timing for solar storage systems. Compare LiFe
Model battery capacity fade over time based on cycle count, DoD, temperature, and calendar aging.
Design battery bank configurations with series/parallel cell arrangements to meet voltage and capaci
Calculate round-trip efficiency, energy losses, and cost of losses for battery charge/discharge cycl
Calculate thermal runaway propagation risk, ventilation requirements, and safety clearances for batt
Calculate battery state of charge from voltage. Monitor lead-acid, AGM, gel, and lithium battery SOC
Calculate the impact of ambient temperature on battery capacity, internal resistance, and cycle life
Size the cooling/heating system for a battery energy storage system based on heat generation and amb
Calculate the right MPPT or PWM charge controller size for your solar array. Account for array volta
Calculate depth of discharge, state of charge, and estimate remaining cycle life based on DoD operat
Calculate energy storage system power rating, energy-to-power ratio, and duration for grid applicati
Calculate return on investment for battery energy storage systems including TOU arbitrage and demand
Size flooded or AGM lead-acid battery banks with Peukert correction, temperature compensation, and a
Size lithium-ion (LiFePO4/NMC) battery systems with cell count, BMS requirements, and thermal consid
Size uninterruptible power supply batteries for critical solar system loads including inverter and B
Calculate AC disconnect and breaker sizes for solar systems per NEC requirements. Size overcurrent p
Size AC disconnect switches for PV inverter output circuits per NEC 690.15 requirements.
Calculate arc fault detection requirements for solar PV systems per NEC 690.11. Determine AFCI/AFDI
Calculate NEC conduit fill for solar PV installations. Determine conduit size based on wire count, t
Estimate DC arc flash incident energy for PV systems using IEEE 1584 methods and calculate PPE categ
Calculate voltage drop in DC solar cables. Essential for efficient solar system wiring design.
Calculate voltage drop dc
Calculate the correct wire gauge for DC solar installations. Account for voltage drop and ampacity r
Size equipment grounding conductors for PV systems per NEC 690.45 and Table 250.122.
Calculate grounding electrode conductor size for solar PV systems per NEC 690.47. Determine GEC sizi
Calculate junction box volume requirements for PV conductor splices and connections per NEC 314.16.
Calculate NEC 690 compliant maximum system voltage, current, and conductor sizing for PV systems.
Calculate ground fault detection thresholds and fuse sizing for grounded and ungrounded PV systems.
Determine required NEC labels, placards, and markings for PV system components with maximum voltage
Size overcurrent protection devices (fuses/breakers) for PV source circuits and output circuits per
Calculate conduit/raceway size for PV system conductors based on NEC Chapter 9 fill requirements.
Size AC circuit breakers for PV inverter connections including 120% rule backfeed calculations per N
Calculate conductor ampacity with NEC derating for conduit fill, ambient temperature, and rooftop te
Size DC and AC fuses for PV systems including string fuses, combiner fuses, and inverter input fuses
Determine NEC voltage class, equipment ratings, and code requirements based on PV system maximum vol
Calculate wire ampacity with multiple NEC derating factors for solar installations including conduit
Calculate maximum attachment spacing for roof-mounted PV based on rail section modulus and wind load
Calculate ballast weight needed to resist wind uplift forces on non-penetrating flat-roof PV mounts.
Calculate additional energy production from bifacial solar panels. Estimate rear-side gain based on
Size solar canopy columns and beams for carport or elevated PV structures based on span and loading.
Calculate total dead load (psf) from PV modules, racking hardware, and wiring for structural analysi
Calculate minimum gap between flush-mounted modules to allow thermal expansion and cooling airflow.
Size helical ground screws for solar PV foundations using torque-to-capacity correlation factor.
Size driven post or pier foundations for ground-mount PV based on frost depth and above-grade height
Compare aluminum vs. steel racking systems for weight, cost, and corrosion resistance in PV mounting
Calculate maximum allowable rail span based on beam deflection limits (L/240) for PV mounting rails.
Analyze combined roof loading from dead, live, snow, and solar equipment loads per IBC structural re
Calculate lag bolt pullout strength and required embedment for roof-mounted PV attachment points.
Calculate seismic base shear and lateral forces on solar structures using ASCE 7 equivalent lateral
Calculate solar carport sizing, panel count, system capacity, and energy production for parking stru
Calculate snow load impact on solar panels and winter production losses. Estimate structural require
Calculate optimal fixed tilt angle from latitude and determine mount dimensions for tilted PV arrays
Calculate wind uplift pressure on solar arrays using ASCE 7 velocity pressure formula with exposure
Calculate PV system availability (uptime) from downtime hours, distinguishing planned vs. unplanned
Compare PV system performance ratio against fleet averages and industry benchmarks to identify under
Calculate energy lost from power curtailment (clipping) when PV output exceeds inverter or grid expo
Size data logger capacity based on number of channels, sample rate, data resolution, and storage dur
Estimate annual PV system degradation rate using linear regression on monthly performance ratio data
Calculate power deviation thresholds for automated fault detection and alarm generation in PV monito
Calculate key PV module parameters from I-V curve data including fill factor, series resistance, and
Calculate detailed solar module temperature derating including Voc, Vmp, Isc, and Pmax coefficients.
Calculate solar panel degradation over time. Estimate lifetime energy production based on annual deg
Calculate solar panel power loss due to temperature. Estimate PV module operating temperature and de
Calculate performance ratio (PR) by comparing actual measured yield against the reference yield from
Calculate solar PV system performance ratio (PR). Compare actual vs theoretical output, identify los
Calculate guaranteed annual energy production with degradation curve for PPA and performance guarant
Calculate energy losses from dirt, dust, pollen, and bird droppings on solar panels. Estimate soilin
Calculate the impact of shading on solar panel production. Estimate energy losses from trees, buildi
Calculate total solar system losses and derate factors. Account for temperature, soiling, shading, w
Calculate the number of current transformers (CTs) and monitoring hardware needed for string-level P
Size a PV monitoring system by calculating required sensors, data channels, and communication bandwi
Calculate solar panel power loss from high temperatures. Estimate actual output based on cell temper
Determine thermal imaging inspection frequency based on system age, degradation rate, and warranty r
Determine optimal pyranometer mounting height and placement for PV plant weather monitoring stations
Calculate P50 and P90 annual energy yield estimates with uncertainty analysis for PV project financi
Calculate your solar system's carbon offset. See how much CO2 you're preventing from entering the at
Calculate commercial solar ROI with ITC, MACRS depreciation, and PPA analysis. Comprehensive financi
Calculate the installed cost per watt for a solar PV system broken down by component category.
Determine when solar LCOE reaches grid parity with utility electricity rates based on cost trends.
Calculate the federal Investment Tax Credit (ITC) for solar PV installations based on system cost an
Calculate the levelized cost of energy (LCOE) for a solar PV system based on capital costs, O&M, and
Calculate net metering savings and credits. Estimate monthly import/export balance and annual utilit
Calculate net metering savings and grid credit value. Compare full retail, avoided cost, and time-of
Estimate annual operations and maintenance costs for solar PV systems based on size, age, and warran
Analyze a Power Purchase Agreement (PPA) comparing contracted solar rates against projected utility
Calculate panel cleaning roi
Estimate Solar Renewable Energy Certificate (SREC) revenue based on system production and market pri
Estimate the residual/salvage value of a solar PV system at end of life based on degradation and com
Calculate MACRS depreciation schedule for commercial solar PV systems using the 5-year accelerated d
Calculate the internal rate of return (IRR) for a solar PV investment including incentives and elect
Estimate annual insurance premiums for solar PV systems based on system value, location risk, and co
Compare the total cost of leasing versus purchasing a solar PV system over the ownership period.
Calculate the net present value of a solar PV system investment over its lifetime using discounted c
Calculate solar system payback period and return on investment. Include incentives and electricity r
Calculate monthly and annual electricity bill savings from solar panels. See how much you can save.
Calculate return on investment for solar tracking systems. Compare fixed mount, single-axis, and dua
Calculate additional savings from solar under time-of-use (TOU) rate structures where peak rates are
Calculate total electrical load from appliances. Essential for solar system sizing with starting and
Estimate the capacity credit (capacity value) of a solar PV plant for resource adequacy and capacity
Calculate demand charge savings from solar PV and battery storage for commercial electricity custome
Calculate solar panel requirements to charge your electric vehicle. Size solar arrays for Level 1 an
Calculate your daily and monthly energy consumption in kWh. Essential for solar system sizing.
Estimate the maximum solar PV capacity a distribution feeder can host without requiring infrastructu
Calculate droop-based frequency response from solar PV and battery systems for grid frequency regula
Size a solar PV system to comply with grid export limits and maximize self-consumption.
Calculate reactive power capability and grid support capacity for smart solar inverters per IEEE 154
Size a grid-connected solar system with net metering. Calculate panels, inverter, and expected savin
Estimate grid interconnection requirements and costs for solar PV systems based on size and utility
Calculate non-detection zone (NDZ) parameters for anti-islanding protection in grid-tied solar PV in
Analyze voltage rise on distribution feeders caused by solar PV generation and determine if mitigati
Calculate battery storage requirements for peak demand shaving. Reduce commercial demand charges wit
Estimate annual energy loss from curtailment due to grid constraints, negative pricing, or export li
Calculate energy storage requirements to smooth solar PV output ramp rates and meet utility intercon
Determine when solar PV generation exceeds local load causing reverse power flow on the distribution
Calculate your solar self-consumption rate and export percentage. Optimize battery storage sizing fo
Calculate electrical losses in transmission lines from solar PV plants to the point of interconnecti
Analyze electricity utility rate structures to determine the value of solar generation under differe
Size a backup generator for hybrid solar systems. Calculate generator capacity for off-grid and emer
Calculate fuel savings and optimal solar penetration for diesel generator-solar PV hybrid systems.
Size an emergency/disaster relief solar kit for essential loads including lights, phone charging, an
Design a solar-battery-grid hybrid system determining optimal solar fraction, battery size, and grid
Size a solar mini-grid for a community including generation, storage, and distribution parameters.
Size a complete off-grid solar system with batteries, panels, charge controller, and inverter.
Size a portable solar panel and battery system for camping, RV, or emergency power based on device l
Size a solar power system for remote telecom towers including DC loads, battery backup, and reliabil
Size a solar-powered reverse osmosis desalination system for freshwater production from seawater.
Size a solar-powered electric fence charger based on fence length, vegetation load, and animal type.
Size a solar power system for automatic gate openers based on gate type, cycles per day, and motor l
Size a solar thermal hot water system. Calculate collector area and tank size for domestic hot water
Design a standalone solar street light or area lighting system with LED fixtures and battery storage
Size a solar-powered refrigeration system for off-grid vaccine storage, food preservation, or cold r
Size a solar-powered attic or greenhouse ventilation fan system based on volume and required air cha
Size a solar-powered water pump system. Calculate panel requirements for well pumps, irrigation, and
Size a solar-powered water pump system based on flow rate, total dynamic head, and solar resource.
Size a standalone photovoltaic system based on daily load, sun hours, battery autonomy, and system l
Calculate small wind turbine output and sizing. Estimate energy production based on wind speed and t
Calculate thermal output and efficiency of concentrated solar power (CSP) systems - dish, tower, or
Calculate heat output and efficiency of evacuated tube solar collectors for medium-high temperature
Calculate instantaneous and daily efficiency of flat plate solar thermal collectors using the Hottel
Calculate HTF properties, flow rate, and heat transfer for solar thermal collector loops.
Design a parabolic trough solar collector loop including aperture width, focal length, and heat coll
Design a solar air heater panel for space heating with air flow rate, outlet temperature, and effici
Size a solar thermal collector array for domestic hot water based on demand, location, and collector
Design a solar box or parabolic cooker calculating cooking temperature, power, and time for meal pre
Size a large-scale solar district heating plant with seasonal thermal energy storage (STES).
Size a solar crop/food dryer based on product mass, initial/final moisture content, and drying rate.
Size a solar thermal system for swimming pool heating based on pool area, desired temperature, and c
Calculate freshwater production from a solar still (basin type) based on solar radiation and still d
Size a thermal energy storage tank for solar hot water or solar heating systems based on collector a
Calculate energy gain from single-axis and dual-axis solar trackers vs fixed-tilt systems. ROI analy
Design a natural circulation (thermosiphon) solar water heater calculating flow rate, tank height, a