Solar Tools & Calculators
Free interactive calculators and technical reference guides built by a working solar contractor. No fluff, no lead forms, just useful tools you can actually use.
Calculators & Simulators
Plug in your own numbers. These tools use real manufacturer specs, local weather data, and field experience from Southwest Florida installations.
Enphase + Powerwall 3 AC Coupling Calculator
Select your Powerwall configuration and Enphase microinverter model to see the maximum number of microinverters you can AC couple without exceeding Tesla's published limits.
Use the CalculatorMicroinverter Warranty Swap Payback Calculator
Is it worth paying a contractor to replace a dead microinverter under warranty? Enter your panel wattage, system age, repair cost, and utility rate to find out.
Use the CalculatorSolar Panel Output Simulator
Adjust panel count, wattage, roof orientation, tilt, and shading to estimate annual energy production and utility bill offset for a Fort Myers, FL location.
Run the SimulatorConduit Fill Calculator
Select your conduit type, trade size, wire type, and conductor count to instantly check NEC conduit fill compliance. Covers EMT, PVC, and rigid conduit across the full range of common solar wiring scenarios.
Use the CalculatorPV String Sizing Calculator
Size your PV strings with temperature-corrected Voc, Vmp, and current calculations per NEC 690.7. Select from the module and inverter library, configure multiple strings across MPPT channels, and get a copy-ready engineering summary.
Use the CalculatorEnphase IQ Microinverter AC Wiring Calculator
Calculate voltage rise across Q cable, branch circuit home runs, and the combined circuit for Enphase IQ microinverter systems. Supports center-tapped strings, multiple conductor sizes, and generates a print-ready engineering schedule with an SVG system layout diagram.
Use the CalculatorSolar Hybrid Electric Pool Heating (SHEPH) Energy Estimator
Live energy model using Fort Myers NOAA climate normals. Enter your pool size, pump schedule, enclosure, water features, and monthly setpoints to see projected monthly kWh consumption, heating costs, 24-hour temperature simulation, and right-sized PV array to offset the heat pump load.
Run the EstimatorSettings Guides & Comparison Charts
Detailed, field-tested reference material for installers and technically minded homeowners. Click-to-expand settings, fault codes, and side-by-side equipment comparisons.
Sol-Ark 15K Inverter Settings Guide
Every Sol-Ark setting explained in plain language with example values. Includes all 38 fault codes with causes and resolution steps. Click any setting to expand.
Open the GuideMidNite AIO Inverter Settings Guide
A more detailed programming guide than the manufacturer provides. Every setting in the MidNite Pro app explained, with notes on firmware differences and closed-loop vs. open-loop configurations.
Open the GuideOff-Grid All-in-One Inverter Comparison
EG4 FlexBOSS vs. Sol-Ark vs. MidNite AIO. Side-by-side specs, field observations, and honest assessments of where each inverter fits best. Downloadable PDF included.
View the ComparisonSolar Output by Tilt & Orientation
180 data points showing how roof pitch and compass direction affect solar production in Southwest Florida. Based on NREL PVWATTS modeling for the local climate.
View the DataNeed Help With Your Specific Situation?
These tools are a starting point. Every home, roof, and utility situation is different. If you want a real assessment from a contractor who does this every day, get in touch.
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