Solar Calculator (Panel Sizing, kWh Production & MPPT)
Plan commercial and industrial PV with free solar calculators for array sizing, annual kWh production estimates, and MPPT charge-controller current screening—before transformer and cable checks.
This hub is the primary entry for the Solar cluster on CalcPanel. Workflows focus on industrial/commercial PV planning—not camping kits, portable power stations, or residential affiliate shopping. Partner electrical checks live on the Power calculator and Electrical calculator hubs.
Start Here: Solar Panel Sizing
Highest-intent entry for commercial PV: convert daily energy use and peak sun hours into required array kW. Use this first when you do not yet have a firm DC nameplate.
- Why featured: Unlocks production estimates and BOS (MPPT) sizing downstream.
- Best for: Warehouse roofs, office campuses, and industrial daylight loads.
- Not for: Portable power stations or camping kits.
Core Tools
All enabled calculators in the solar-calculators category—static list for crawl and navigation.
Solar Panel Sizing Calculator
Size PV array kW from daily kWh, peak sun hours, and system derate for commercial planning.
Use Calculator →Solar Panel kWh / Production Calculator
Estimate annual and monthly kWh from array size, peak sun hours, and system loss.
Use Calculator →MPPT Charge Controller Sizing
Screen minimum MPPT amps from module Isc, parallel strings, and cold Voc checks.
Use Calculator →Off Grid Solar Load Calculator
Roll up remote-site watts and hours into daily kWh before array and autonomy sizing.
Use Calculator →Peak Sun Hours Calculator
Estimate planning PSH from climate band or daily insolation for sizing and yield.
Use Calculator →Solar Battery Autonomy Calculator
Estimate multi-day PV storage autonomy from bank kWh, DoD, and daily load—not UPS runtime.
Use Calculator →Solar Panel Tilt Calculator
Estimate tilt and azimuth from latitude and season for commercial roof geometry screens.
Use Calculator →Series Parallel String Calculator
Compute string volts and array amps from module ratings and series × parallel layout.
Use Calculator →Solar Panel Charge Time Calculator
Estimate peak-sun days to recharge a battery bank from array watts and PSH.
Use Calculator →Solar Inverter Sizing Calculator
Size inverter AC kW from array DC power and DC/AC ratio for commercial BOS planning.
Use Calculator →What is a Solar Calculator?
A solar calculator on CalcPanel is a planning workflow for commercial and industrial PV: define energy need, convert it to array kW, estimate production, then screen charge-controller current before transformer, cable, and interconnection reviews. It complements—not replaces—OEM design software and site irradiance studies.
Common Solar Calculations
- How to calculate solar panel array size from daily kWh and peak sun hours.
- What peak sun hours mean versus daylight clock hours.
- How to estimate solar kWh production from a known array.
- Difference between panel sizing and energy production tools.
- How to size an MPPT charge controller from Isc and parallel strings.
- When to move from PV screens to transformer and cable sizing.
Solar Calculation Workflow
Follow this order for a coherent industrial PV screen.
- Estimate off-grid daily kWh (or use known facility energy).
- Confirm planning peak sun hours for the site band.
- Size the PV array (kW) from daily energy and PSH.
- Estimate annual kWh production with an explicit system-loss assumption.
- Screen storage autonomy days when batteries are in scope (not UPS tools).
- Size MPPT charge-controller current; continue to cable size and the transformer solar guide.
Use Cases
- Warehouse roof offset: Size array kW for 60–120 kWh/day process and lighting loads, then check annual yield before inverter quotes. Start with panel sizing.
- Office campus bill screen: Convert a known 10–50 kW array into annual kWh for tariff conversations using production, then map cost with the energy estimator.
- Hybrid / off-grid BOS: After array layout, screen MPPT amps and cold Voc in MPPT sizing, then review storage energy in the industrial BESS kWh sizing guide—not UPS runtime tools.
Which Solar Tool Should I Use?
Goal → recommended calculator mapping for decision support.
| Goal | Recommended tool |
|---|---|
| Roll up off-grid daily energy | Off grid solar load calculator |
| Estimate peak sun hours | Peak sun hours calculator |
| Find required array kW from daily energy | Solar panel sizing calculator |
| Estimate annual / monthly PV kWh | Solar panel kWh calculator |
| Estimate battery autonomy days (PV/BESS) | Solar battery autonomy calculator |
| Estimate panel tilt / azimuth | Solar panel tilt calculator |
| Design series-parallel strings | Series parallel calculator |
| Estimate PV recharge time | Solar panel charge time calculator |
| Size PV inverter AC rating | Solar inverter sizing calculator |
| Size MPPT charge-controller current | MPPT sizing calculator |
| Screen DC conductor ampacity (PV strings) | Cable size calculator (PV DC note) |
| Compare MPPT vs PWM controllers | MPPT vs PWM solar charge controller |
| Learn series/parallel PV wiring | How to wire solar panels in series and parallel |
| Size a solar battery bank (autonomy) | How to size a solar battery bank |
| Use irradiance data → PSH | How to use solar irradiance data |
| Understand tilt / azimuth | Solar panel tilt angle explained |
| Learn how to size a commercial solar array | How to size a commercial solar array |
| Learn how to size an MPPT charge controller | How to size a solar charge controller |
| Learn how to size PV DC cable | How to size solar DC cable |
| Plan commercial solar interconnection | Commercial solar interconnection requirements |
| Review grid-tie protection expectations | Grid tie solar protection requirements |
| Choose system loss % / derate η | Solar system losses & derating |
| Plan solar interconnection transformer | Transformer sizing for solar systems |
| Estimate facility energy cost (non-PV-specific) | Industrial energy estimator |
| Rough solar payback / bill offset screen | PV production → energy cost estimator (no dedicated ROI tool) |
Planning Topics
Cross-links for depth after the core solar workflow.
- How to size a commercial solar array — method companion to the panel sizing calculator.
- How to size a solar charge controller — MPPT current / Voc method for the MPPT tool.
- MPPT vs PWM solar charge controller — when to pick which topology.
- How to wire solar panels in series and parallel — Voc/Isc layout method.
- How to size solar DC cable — Isc-based PV DC ampacity and drop checks.
- How to size a solar battery bank — autonomy days / DoD (not UPS tools).
- How to use solar irradiance data — W/m² → PSH for design.
- Solar panel tilt angle explained — tilt/azimuth planning with the tilt tool.
- Commercial solar interconnection requirements — utility process, studies, and filing checklist.
- Grid tie solar protection requirements — anti-islanding, disconnects, and OCPD screens.
- Solar system losses & derating — what to enter for loss % / η in production and sizing tools.
- Transformer sizing for solar systems — AC interconnection and transformer kVA context.
- Industrial BESS kWh sizing — storage energy planning; keep separate from UPS battery tools.
- Industrial energy estimator — tariff $/kWh for rough bill offset; pair with PV production for payback screens (not a consumer ROI calculator).
- Power calculator hub — factory load, generator, and PF workflows adjacent to PV.
- Electrical calculator hub — cable, breaker, and voltage-drop checks.
Solar Calculator FAQ
How do I estimate solar payback or ROI?
We do not ship a consumer solar payback calculator. Screen annual kWh with the PV energy production calculator, then map avoided cost with the industrial energy estimator (kWh × tariff). Capex, incentives, and TOU demand charges need a project financial model—not this hub.
What is a solar calculator?
A solar calculator helps size PV array kW, estimate annual kWh production, and screen MPPT charge-controller current for commercial and industrial planning—not camping kits or portable power stations.
How do I size a commercial solar array?
Start with the solar panel sizing calculator: Array kW ≈ daily kWh ÷ (peak sun hours × system efficiency). Then estimate yield and size MPPT controllers for string current.
What is the difference between panel sizing and kWh production?
Panel sizing finds required array kW from daily energy use. The kWh production calculator estimates annual/monthly energy from a known array size, peak sun hours, and system loss.
How is MPPT sizing different from UPS battery tools?
MPPT sizing screens PV charge-controller amps from module Isc and parallel strings. UPS runtime and battery calculators serve backup power—do not merge those intents.
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