Size solar systems with engineering precision
SolarCalcKit delivers deterministic electrical sizing tools for solar professionals, contractors, and DIY engineers. Fully client-side, instant calculation engines, live SVG topological wiring diagrams, and transparent ledgers.
Suite Modules
Engineering Calculators
Select an instrument to start sizing. All calculators re-render results live on input change with zero telemetry.
Solar Battery Sizing Instrument
Size your battery bank from daily energy use, autonomy days, system voltage, chemistry, and depth of discharge. Live SVG series/parallel wiring diagram and ledger breakdown.
Battery Bank Wiring & Topology
Convert any target bank kWh or Ah into exact physical series and parallel strings, whole battery counts, and terminal wiring diagrams.
MPPT Charge Controller Sizer
Determine required continuous charging current from PV array wattage and battery voltage. Checks cold-temperature open-circuit voltage (Voc) against controller ratings.
Solar Wire Size & Voltage Drop
Size DC solar cabling from current, round-trip length, and allowable drop. Copper and aluminum conductor resistivity tables with standard AWG and mm² gauges.
Inverter Sizing & DC Current
Size inverters for combined continuous running wattage and motor startup surges. Computes DC battery current draw and fuse requirements.
Solar Daily Load Calculator
Audit household electrical appliances to calculate total daily energy consumption (Wh & kWh/day) and connected instantaneous peak power.
Compliance & Standards
Transparent Reference Methodology
Our algorithms follow internationally accepted engineering codes. We never use arbitrary multipliers or hidden safety factors.
Recommended Practice for Sizing Lead-Acid & Lithium Batteries for Generating Stations
Provides standard cell voltage baselines, depth of discharge protection, and whole-string rounding rules.
National Electrical Code: Solar Photovoltaic & Energy Storage Systems
Mandates transparent conductor sizing, temperature-corrected open-circuit voltage checks, and disconnecting means.
Conductors of Insulated Cables & Design Requirements for PV Arrays
International resistance dataset for copper and aluminum conductors and MPPT voltage window safety thresholds.
About Raxa Technology
SolarCalcKit is engineered and maintained by Raxa Technology as a free, transparent, and 100% client-side solar engineering platform. We build deterministic modeling tools for solar installers, electrical contractors, off-grid engineers, and clean energy enthusiasts worldwide.
For inquiries, engineering feedback, partnership opportunities, or technical support, contact our team directly at: