PRO

Sasol Pv calculator

Professional PV string, MPPT, voltage, current, and design validation tool.

Dr.Saman

☀️ Panel Inputs

Panel Voc (V)

Panel Vmp (V)

Panel Imp / Imax (A)

Panel Isc (A)

Panel Power (W)

Voc Temp Coeff (%/°C)

🌡️ Environmental & Control

Lowest ambient temp (°C)

STC temperature (°C)

Winter safety margin (%)

Never exceed Safe max series panels. The app corrects Voc automatically for cold weather and checks voltage, inputs, current, Isc, and max PV power.

⚡ Inverter Inputs

Max PV Voc (V)

MPPT Min (V)

MPPT Max (V)

Maximum PV Power (W)

No. of MPPTs (1–4)

Inputs on MPPT 1

Inputs on MPPT 2

Inputs on MPPT 3

Inputs on MPPT 4

Enter the active MPPT count, then set input ports for each MPPT. Unused MPPTs should stay at 0 inputs.

🧠 Advanced MPPT Setup (Optional)

Optional per-MPPT limits + manual allocation

MPPT 1

MPPT 2

MPPT 3

MPPT 4

Use manual allocation?

Leave per-MPPT current boxes blank to use the common limits. Turn manual allocation on only when you want to validate your own string distribution.

📊 Calculated Results

✅ Design Status & Quick Interpretation

🛠️ Auto Fix & Recommended Valid Setup

Step	What to enter	Where	Units	Notes
1	Enter panel Voc, Vmp, Imp, Isc, power, and Voc temperature coefficient.	Panel Inputs	V, A, W, %/°C	Take all values from the panel datasheet.
2	Enter inverter voltage limits, MPPT count, inputs on each MPPT, and common MPPT current limits.	Inverter Inputs	V, A, count	Use the MPPT count first, then set inputs for each MPPT. Put 0 for unused MPPTs.
3	Optional: enter different current limits per MPPT and manual string allocation.	Advanced MPPT Setup	A, count, on/off	The app already corrects Voc for cold weather.
4	Enter lowest site temperature, STC temperature, and winter safety margin.	Environmental & Control	°C, %	Never exceed Safe max series panels.
5	Read minimum and safe maximum series count, then review configured DC power and final status.	Calculated Results + Status	panels, W, text	All checks should show PASS and final status VALID DESIGN.

Key formulas	Meaning
Valid strings / MPPT	Minimum of input ports, current limit by Imp, and short-circuit limit by Isc.
Configured allocation	Manual strings per MPPT when manual mode is ON, otherwise automatic sequential allocation.
Recommended valid setup	Best valid strings capped by total MPPT capability, then distributed across MPPT1:MPPT4.
Configured DC power	Configured total strings × panels/string × panel power.