Exprts Solar
Solar design & quotation studio

Turn sunlight into smarter projects.

Size the system, shape the PV array, calculate the balance of system and prepare a client-ready quotation — all in one solar workspace.

Create a solar quotation Open solar calculator
PV layout Priced BOQ Design checks
PV ARRAY / ROOFTOP SYSTEMSUNLIGHT → DC POWER → INVERTER
3D project viewSee the structure take shape
BOQ & pricingQuantities in one place
Engineering checksSize with more confidence

Choose your next step

Two tools. One smoother workflow.

Start with a client quotation, or work through the technical sizing details first.

For proposals & projects

Solar quotation in 1 min.

Enter the site and system size. Generate a 3D layout, priced bill of quantities and a client-ready quotation.

Start a quotation
For technical sizing

Solar calculator

Work through system sizing, string configuration, inverter selection and AC cable checks for your design.

Open calculator
01Set the projectSite details & system size
02Engineer with clarityLayout, sizing & quantities
03Prepare to shareQuotation & project documents
← Home Solar Quotation in 1 min. · Exprtssolar
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Features Solar Sizing · String Config · Cable Ops

Size the sun, string by string. Wire it right.

A precision toolkit for solar installers, electricians and PV designers. Three calculators — system sizing, string configuration, and AC cable selection — cross-checked against catalogue ampacities, voltage-drop limits, and MCCB rating standards.

Start calculating No install · Works offline · Mobile ready
The Toolkit
01 — System Size

Panels, strings and BOS — sized from your plant capacity.

From kW to array count, min/max panels per string, inverter rating, DC cable, AC cable, earthing, and MCCB — all in one pass.

02 — String Sizing

Fit a fixed panel count inside the MPPT window.

Split a known panel count into strings that stay under the inverter's cold-day Voc ceiling, distributed as evenly as possible.

03 — Cable Ops

Ampacity-safe, voltage-drop compliant.

Scans standard aluminium sizes; picks the smallest that clears both the current requirement and your allowed voltage drop.

The Calculators

Switch between tools with a click, or use the ← → arrow keys.

System Inputs

01 / Sizing
How to use: Enter plant capacity and panel/inverter specs. We'll size the array, strings, DC/AC cable, earthing and MCCB — all in one go.
Total DC plant capacity in kilowatts. Enter a positive kW value (e.g. 10).
Rated peak power per module. Enter a positive Wp value.
Open-circuit voltage at STC. Enter a valid Voc in volts.
Max-power voltage at STC. Enter a valid Vmp in volts.
Typically -0.25 to -0.35 %/°C. Enter a temperature coefficient.
Absolute maximum DC input voltage. Enter the inverter's max DC voltage.
Lower bound of MPPT window. Enter the inverter's min MPPT voltage.
One-way run length in metres. Enter a positive length in metres.
Determines ampacity column used.
Auto-switches to multicore for >7 kW.
Record low ambient. Enter a minimum site temperature.
Record high ambient. Enter a maximum site temperature.

Results — Sized

01 / Output
–
Panels
–
Inverter (kW)
–
Strings
Min. Panels per String–
Max. Panels per String–
String Configuration–
DC Wire–
Phase / Cable Type–
AC Wire (Aluminium)–
Earthing Wire–
MCCB–
Show formula details
DC wire is fixed at 4 sqmm/6 sqmm per string. For High Altitude & High Temperatue Region use 6 sqmm DC wire. AC wire — full-load current from inverter kW, +20% safety margin, PF 0.8, checked against catalogue ampacity and a 3% voltage-drop limit. Phase auto-selects from capacity (≤ 7 kW → single-phase, > 7 kW → three-phase). Voltage drop is computed at design current (post-derating). For full control, use the AC Wire Sizing tab.