How to calculate string design for solar Inverter?

Manual String Size Calculations

How to Calculate Minimum String Size

The minimum string size is the minimum number of PV modules, connected in series, required to keep the inverter running during hot summer months. The National Electrical Code (NEC) doesn’t address the effects of high temperatures on module voltages because that is considered a performance issue, not a safety issue. However, our customers care whether the system we design is operating during the summertime when their return on investment is highest.
In order to calculate the minimum string size we first have to calculate the minimum output voltage, Module Vmp_min, that each module will produce for the specific installation site. Then take the inverter minimum voltage and divide by the calculated module minimum voltage to get the minimum number of modules.
The module minimum voltage is calculated using the high temperature for the installation site when the modules would produce the lowest expected voltage. This is because as a PV module gets hotter it is less efficient and produces less voltage.

How to Calculate Maximum String Size

The maximum string size is the maximum number of PV modules, connected in series, required to keep the inverter running during winter months. The National Electrical Code (NEC) doesn’t address the effects of low temperatures on module voltages start increasing
In order to calculate the maximum string size we first have to calculate the maximum output voltage, Module Vmp_max that each module will produce for the specific installation site. Then take the inverter maximum voltage and divide by the calculated module maximum voltage to get the maximum number of modules.
The module maximum voltage is calculated using the low temperature for the installation site when the modules would produce the highest expected voltage. This is because as a PV module gets cooler it is high efficient and produces high voltage.

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For more information contact us 😊.

Name - Raman Kumar
Contact No- 9871073342

[sagarsanap]

One of the best channel for solar technical knowledge....keep it up

[asifalasad]

Excellent Bro. its amazing video, God Bless you.

[sohampise]

Step by step explanation ✌️ please share excell sheet for our knowledge and practice

[ApumanSVE]

Wonderful explanation! Really usefull!

[dheerajkulal]

Very neatly explained. Please share calculation

[qadeerahmad]

Sir i have a question. I have an inverter having max solar power array 1320w can we install 6 solar panels of 260w on it as it exceeds 1320w but V and I remains within the range of inverter if i make 2 strings of 3 solar panels

[MrMechdevil]

Thanks @solarfacts.

Expecting the sheet to evaluate more configuration n built knowledge
Kindly share

[ahmedmalik]

Great explanation, more explanation and understanding will be through excel sheet, please share the excel sheet.

[MayurUkey-dt]

Good explained sir please share Exel sheet

[PSCZONE-zvui]

sir bahut acche se explain kiya hai apne, share the excel sheet please

[dilipsingh]

Very good explanation sir excel sheet sir

[janardhanjagtap]

Very useful and impressively explained. Requested to share the excel sheet.

[Jayabhn]

Plz share the Excel sheet of string sizing calculation, ur explanation is good

[srinivasnowduri]

Sir, it was very nice and cool learning from you. Could you please share the Excel sheet?

[devendrakonduru]

Hello Raman, I have existing Solar Capacity of 2kw (adani elan shine Bifacial) installed current using Polycab inverter polycab PSIS 3k SM1. Can I add additional 2kw on this inverter?. Please respond.

[santoshshelke]

Nice video sir
Can you plese share the Excel Sheet

[muzammilhussain]

Great video with detailed explanation. Kindly share excel sheet for calculation.

[visheshkumargupta]

Raman ji @ You have calculated string voltage at Standard test Conditions with 1000W/m2 that is ok but in NOCT condition you have not considered the value of voltage Vmin to Vmax at 800W/m2. Kindly mention final calculatiin at NOCT value for string calculation. STC value is only applicable for lab test only. In practical irradiance 1000W/m2 acheived but cell temperature never maintain 25°C. Kindly check & share correct data.

[udayasinghbikas]

How do you calculated voltage change per degree? Is this data also given in module data sheet?

[hasibahmed]

Best explanation. Sir please provide Excel sheet. I'm very thankful to you for this kindness