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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Video link -
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2. What is Enphase microinverter ? // Microinverter & it’s step wise installation explanation. - lnkd.in/e3mr7HjF
3. Concept of Solar Inverter Overloading //Solar inveter overloading is right or wrong !!!! - lnkd.in/eDNXTc2z
4. What is Reactive Power ? // Why Industries Power Factory become poor after installing Solar! - lnkd.in/ei8S_d_m
5. What is CT? What is CT Ratio? How to select CT? - lnkd.in/eCkNRTtZ
6. How to check Current Transformers? - lnkd.in/eT5gc99e
7. Why Solar Systems are not Success with Zero Export device. // Precautionary Majors for Zero Export. - • Why Solar Systems are ...
8. How to design SolarEdge string // How to use SolarEdge string designing tool. - • How to design SolarEdg...
9. How to install solar panel // What is the right way to install solar panel. - • How to install solar p...
10. How to calculate string design for solar Inverter? -- lnkd.in/ekujjSpm
11. How to design stand alone solar system & Battery bank capacity - lnkd.in/exEYzYdD
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Name - Raman Kumar
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[@sagarsanap5519]

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

[@solarfacts4242]

Thank you so much

[@sohampise260]

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

[@solarfacts4242]

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[@shrwan477]

Sir shear Excel sheet plzz

[@ajeet.singh800]

बहुत ही उपयोगी विडियो

[@solarfacts4242]

Thanks sir

[@vermapawan06]

Your way of explaining complex things is made easy. Very informative. Keep sharing the knowledge, All the best👍. Share the excel sheet plz

[@solarfacts4242]

Thank you

[@girigsr6993]

Bohuth acha samjaya hai

[@solarfacts4242]

Thank you

[@roger1857]

Practical Approach. Nice knowledge

[@ApumanSVE]

Wonderful explanation! Really usefull!

[@solarfacts4242]

Thank you 😊

[@user-xs6oq4iz9x]

Hi Raman, above video was good. I need you to do a video on calculating the rating for DCDB( fuse, SPD, MCD) n ACDB(fuse, SPD, MCB) for On grid rooftop solar plant 2, 3, 4, 5, 6,8,9,10,12Kw using Solis inverter.

[@fahadmukhtar1124]

Excellent Raman !!!

[@solarfacts4242]

Thanks

[@asifalasad143]

Excellent Bro. its amazing video, God Bless you.

[@sourabhshrivastav6149]

Very helpful video sir please share this Excel sheet

[@ehteshamhaider6196]

Well explained sir 👏 👍

[@solarfacts4242]

Thanks 🙏

[@minujha8214]

Nice explaination

[@solarfacts4242]

Thanks 😊

[@ahmedmalik5759]

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

[@solarfacts4242]

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[@janardhanjagtap9082]

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

[@solarfacts4242]

Ok 👍🏻

[@PSCZONE-zv2ui]

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

[@solarfacts4242]

That is paid you can contact 9871073342

[@Ajmalkhan-zr4fj]

Very good information

[@hasibahmed4316]

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

[@MrMechdevil007]

Thanks @solarfacts. Expecting the sheet to evaluate more configuration n built knowledge Kindly share

[@solarfacts4242]

Yes 👍🏻

[@muzammilhussain3955]

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

[@rksonivlog2874]

Very very technical. Nice information 👍

[@solarfacts4242]

Thanks

[@praful3107]

Great Going Raman. Keep up the good work and keep sharing knowledge to Solar enthusiasts!! I'll definitely recommend this channel to the folks who are interested to learn about Solar and Electrical stuffs.

[@solarfacts4242]

Thanks Praful. Sure I will.

[@fahadmukhtar1124]

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[@solarfacts4242]

Thanks 🙏

[@surajbk1020]

Nice 👏👍information sir

[@solarfacts4242]

Thanks Bhai 👍

[@RaviKumar-rp9qg]

Well explained sir 👍👍👍👍 Keep it up. Wants more video from your side. Thanks

[@solarfacts4242]

🙏 thanks

[@grajesh4562]

Great Explanation, please share the excel sheet

[@solarfacts4242]

That is paid actually

[@AdvancedSolarPowerSystems]

Very good

[@solarfacts4242]

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Nice Video bhai

[@solarfacts4242]

Thanks bhai

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Thanks 🙏

[@tksha8514]

Keep it up. Very well presented Well wishes. PLS share excell sheet

[@debasishchowdhury6496]

Fantastic explaination. U did a really great job. This for On-Grid system right with no battery storage. What is the total Electrical load in KWh ? How will it be matched with the inverter ? Will you be able the excel sheet ?

[@solarfacts4242]

Yes

[@shubhamkushwah5133]

Thanks sir

[@shubhamkushwah5133]

Will you send this exel sheet to my id

[@ramsara86]

Very clear explanation Sir, thanks Please share the excel sheet

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[@solarfacts4242]

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[@user-ce5gt2om7m]

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[@arideep.halder]

Awesome video

[@solarfacts4242]

Thank you 😊

[@sameermfaroor9856]

why don't you added the 19 string example as well. If we go for 19 string it values lies in operating range.

[@deepeshkandel1051]

Bahut Accha bhai. Please share kariye ye excel sheet.

[@solarfacts4242]

Ok 👍

[@manikantapolepally1758]

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[@solarfacts4242]

You can but that is paid

[@vishalunawane6155]

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[@shrwan477]

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[@ajinkyakoli4835]

very nice explained.. thank you sir. plz send the sheet

[@abhishekvachhani3604]

Sir parameters konse le STC OR NOCT

[@amitshaikh8891]

Sir 1 video dcdb and acdb calculation pe banao in detail

[@solarfacts4242]

Sure

[@mehuldonga8504]

Please share me excel file for this wonderful information

[@solarfacts4242]

Thant is paid actually

[@qadeerahmad8752]

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

[@solarfacts4242]

Yes you can if voltage is in the range of inverter

[@akankshasomkuwar840]

Very nice information sir. But in the video you have already taken 18 panels in string with 3 Nos of string , sir could you explain this part. Can you share excel how to decide no of panels in serial and parallel according to inverter MPPT voltage range

[@solarfacts4242]

Yes we can share

[@shefeeq436]

@@solarfacts4242 waiting for the video about how to decide serial and parallel connection

[@grajesh4562]

​@@solarfacts4242

[@aravindkulkarni8586]

Dear Sir, Well explained. I need 32 MW solar plant ( each inverter 2MW ) How calculate inverter wise generation loss . So I request you to kindly help & share excel sheet .

[@solarfacts4242]

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[@savankhant8]

useful information for string designing. can you provide an excel sheet?

[@solarfacts4242]

Yes but that is paid actually

[@girigsr6993]

Please send me the Excel sheet format thank you very much

[@solarfacts4242]

That is paid actually

[@santoshyadav-ps3ov]

i have a doubt. how am i define , how much modules are connected series and parallel . As we know only define modules per String ,but string are connected in series so what about for current?

[@solarfacts4242]

Modules in string means no of panels in Series.

[@smahammadshafi4532]

Hello sir , Very nice explanation, 1. What is the inverter Max DC input current. 2. Also explain about Inverter Nominal Voltage. 3. Number of MPPT and Number of strings per MPPT

[@solarfacts4242]

Thanks you

[@solarfacts4242]

Inverter maximum DC power, Nominal voltage and string per MPPT you can get from data sheet of inverter

[@smahammadshafi4532]

@@solarfacts4242got the information in data sheet, array current with in inverter Max DC current input.

[@smahammadshafi4532]

I have created On-grid system design sheet . Will you check it's correctness.

[@solarfacts4242]

Ya sure

[@devendrakonduru611]

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.

[@visheshkumargupta3536]

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.

[@solarfacts4242]

By calculating STC we are finding that my voltage will not cross the range of my inverter and if STC conditions are fulfilled then there is no problem with NOCT

[@visheshkumargupta3536]

@solarfacts4242 Good evening! Yes agree with you. STC calculations are only defined Inverter voltage limits from Vmax to Vmin. But inverter operating dc voltage, you will calculate it with min to max temperature at Vmp voltage. After putting your threshold value you have also checked the inverter max power range at which voltage, it produces max output (It's generally specified on inverter data sheet. Hence the conclusion is that the calculation of voltage at stc only reflects the minimum and maximum voltage limits of the inverter, in which the value of stc voltage should not be more than the mppt value of the inverter. (For safety operations). And according to the site condition the strings voltage to be defined at minimum to maximum voltage at vmp including inverter maximum output range.

[@user-mm3qj5jh3d]

Sir aap bahut sahi tarike samajte ho

[@user-mm3qj5jh3d]

Sir can you please share excel sheet

[@user-hc9sr6xm4o]

hi, good work, plz share excel sheet.

[@solarfacts4242]

Sure but that is paid sir

[@kunchamsateeshkumar4772]

Thank you for the information. kindly share the excel sheet

[@solarfacts4242]

Sure but that is paid please connect 9871073342

[@gajjarkalpesh8182]

Step by step explanation please share excell sheet for our knowledge

[@ArifKhan-hy8mm]

❤ from Pakistan

[@solarfacts4242]

Thanks

[@ArifKhan-hy8mm]

@@solarfacts4242 kindly sir mery question ka rply dy den.

[@solarfacts4242]

Which question

[@preethivirajmurugesan3578]

Well explained can I get the excel sheet please ?! Thanks in advance

[@solarfacts4242]

Sure sir but that is Paid actually please contact 9871073342

[@kashifabbas293]

excellent explanation... sir i want this excel sheet.. kindly send me

[@solarfacts4242]

Thank you

[@jigneshsarvaiya478]

Great temperature difference between Inverter module to kya kare

[@abhisheksahu563]

Hi Raman I want to know is it possible to design a system for industry on grid 10or 20 kw and solar system 60 kva so to minimize the bill especially for hotel industry normally 40% occupancy but some time 100%

[@solarfacts4242]

Yes can be done ✅

[@ArifKhan-hy8mm]

Sir mn ny 5.5kw ki submersible motor and invt 7.5~11kw kharida ha.545 watts k 18 panels lea hn .un 18 panels ko ager series mn lagaon to theek raghy ga.Voc=49.52v and Vmp=40.80v hn q k open circuit voltage 891.36 ho jaen gn.to kya ye inverter pe msla to ne kren gn please explain. Thank you

[@solarfacts4242]

That will depend if your string voltage is in range of Inverter voltage then this will work

[@muhammadishfaq576]

Hi dear bhoot khob pdf to day

[@solarfacts4242]

Thanks sheet is paid actually

[@arvindmenon5240]

thank you for the video.can you share the excel sheet

[@solarfacts4242]

Sure but is paid actually

[@jayeshsinha7045]

my short leg height is 2.33m what should be height of long leg at distance of 4.18m distance so together tilt angle of 18degree tilt angle jayesh sinha

[@udayasinghbikas]

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

[@solarfacts4242]

Yes this is in the module datasheet

[@arundcz]

From where to get the data of per degree change.

[@solarfacts4242]

From module datasheet

[@kaluramgodara8646]

Bhai sab me ek kisan hu or mene soler plant lgaya h lekin usme string ki proper setting nahi ho pai h pls AAP apni Excel sheet bheje to me apne plant ki setting sahi kar saku AAP ki ATI karpa hogi

[@solarfacts4242]

Ok

[@harshitagarwal3797]

Hello sir thanks for vedio Please share excel sheet

[@solarfacts4242]

@HARSHIT AGARWAL that is paid

[@tugrulmuhammadsabir487]

Good info. Please modify as indicated by vishek

[@solarfacts4242]

Will make a new video

[@mehboobahmad816]

Very nice ,can you share the Excel sheet with me

[@solarfacts4242]

That is paid actually

[@paragpathak9558]

Beautiful Explanation Sir... Can I get the Excel Shit, please!

[@solarfacts4242]

That is paid actually

[@zaeemqazi8232]

Hello sir please send Excel...... Your solar techer for all beginners

[@vinayakgosavi4540]

please share string design for 545 wp of Renewsys panels for 100 kw

[@mcsgchd]

Thanks dear for sharing information please share Excel sheet

[@solarfacts4242]

Thanks that sheet is paid actually

[@PankajSingh-gm4hi]

❤

[@aakashsathwara3046]

Nice Video sir👍 please share that excel sheet

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Thanks 🙏

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Very nice ....plz share ur sheet😊

[@VijaySingh-cq7mh]

Good Job Bro... 👍 Keep it up... Nice Practical knowledge video..

[@solarfacts4242]

Thanks

[@rambabump]

mr.Raman. very nice explanation ,Please send me the excel sheet link

[@solarfacts4242]

OK

[@fahadasaleem]

thanks for the info. kindly share the sheet

[@solarfacts4242]

sure

[@arunps1584]

Hi, very good content.informative and structured. I'd appreciate it if you pls share the excel. Thank you

[@solarfacts4242]

That is paid actually

[@haseebazeem9153]

​@@solarfacts4242price please?

[@kunalkulkarni444]

Sir please share Excel sheet for string calculation. Currently I am using fronius 9 KW 3 phase & 315 Watt 27 no of poly panel. Please tell me how many panel installated in one string & how many in 2 string. Please share sheet.

[@solarfacts4242]

Ok

[@maheshmuley4407]

Nice Info Plz. Shear me Excle sheet

[@solarfacts4242]

@mahesh that is paid actually

[@sunsolarcells]

Sir inverter me mppt 1 se 10 Tak hai Inka aapas connection Kaise rahta hai inverter ke under

[@ZahidHussain-gs6jt]

how we can calculate voltage change per deg C plz explain

[@saan_viki1990]

if in one inverter 20 strings are connected, somehow out of 20 strings 5 no. strings are damaged. is it voltage and current change or not

[@solarfacts4242]

Yes current will change

[@malikalihassan7764]

Can I get this excel sheet?

[@solarfacts4242]

Yes but that is paid actually

[@kunalgaikwad9138]

Great work sir share sheet ..

[@solarfacts4242]

ok

[@anandsingh-tk9yh]

sir what is the meaning of feed in start voltage

[@solarfacts4242]

that is the minimum voltage which is required for the starting of the inverter

[@sohampise260]

Hi, Raman , Hope you are doing well, Could you please share excel file with me so that i can practices.

[@solarfacts4242]

Sure but that is paid please connect 9871073342

[@saurick9548]

Sir can you plzz share the excel sheet

[@solarfacts4242]

OK

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Sir exal sheet milega kaya

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Sir needed excel sheet.

[@solarfacts4242]

Hi that is paid actually

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Well explained, pls share sheet

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ok

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Please provide the excel sheet

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This is paid actually

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Sir plz share the Excel sheet

[@solarfacts4242]

That is paid actually