System sizer

Start with the load, not a kit.

This tool creates a planning baseline for battery energy, solar array, inverter output, and controller current checks. Use it to prepare a shortlist and verify component documentation.

Planning tool

Build a planning baseline

Start with the load and conditions you can describe today, then turn the result into a clear component specification brief.

View assumptions and sources →
Usable battery baseline——
Solar array planning range—before roof, shade, and seasonal checks
Inverter planning minimum—verify surge and battery BMS limits
Controller current check—verify PV voltage and datasheet limits
Next decision

Compare this baseline against roof space, seasonal production, and your actual equipment documentation.

Specification checklist

Turn the estimate into checks you can verify.

Use this pre-purchase brief to compare component documentation against the plan you just built.

Battery storage

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Inverter

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Solar array

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Charge controller

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Before selecting components: verify manufacturer documentation for surge power, BMS discharge and charge limits, PV input voltage, temperature limits, cable sizing, fuses/breakers, mounting, and local requirements.

What it models

Daily energy, reserve days, nominal voltage, solar input, and a conservative loss allowance.

What it does not decide

Site shading, mounting, wiring, protection, equipment compatibility, permits, or local installation requirements.