How to calculate string design for solar Inverter?
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- เผยแพร่เมื่อ 2 ต.ค. 2021
- 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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One of the best channel for solar technical knowledge....keep it up
Thank you so much
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Keep it up.
Wants more video from your side.
Thanks
🙏 thanks
Very very technical.
Nice information 👍
Thanks
बहुत ही उपयोगी विडियो
Thanks sir
Your way of explaining complex things is made easy. Very informative. Keep sharing the knowledge, All the best👍. Share the excel sheet plz
Thank you
Practical Approach. Nice knowledge
Excellent Raman !!!
Thanks
Wonderful explanation! Really usefull!
Thank you 😊
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 ?
Yes
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.
Thanks Praful.
Sure I will.
@@solarfacts4242 Raman bahi i need this excel sheet , should i send my email ID ?
Step by step explanation ✌️ please share excell sheet for our knowledge and practice
Sure 👍
Sir shear Excel sheet plzz
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.
Well explained sir 👏 👍
Thanks 🙏
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Thank you 🙏
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Thanks Bhai 👍
Bohuth acha samjaya hai
Thank you
Very well explained
Thanks for liking
Nice explaination
Thanks 😊
Thanks @solarfacts.
Expecting the sheet to evaluate more configuration n built knowledge
Kindly share
Yes 👍🏻
Very good information
Great video with detailed explanation. Kindly share excel sheet for calculation.
Nice Video bhai
Thanks bhai
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Thanks 🙏
Great explanation, more explanation and understanding will be through excel sheet, please share the excel sheet.
Sure but than Paid actually please contact 9871073342
Very useful and impressively explained. Requested to share the excel sheet.
Ok 👍🏻
Thanks sir
Will you send this exel sheet to my id
Awesome video
Thank you 😊
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.
Very clear explanation Sir, thanks
Please share the excel sheet
Thanks 🙏
very nice explained.. thank you sir. plz send the sheet
Keep it up. Very well presented
Well wishes.
PLS share excell sheet
Very nice explanation sir please provide Excel 🙏🙏🙏
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
Yes we can share
@@solarfacts4242 waiting for the video about how to decide serial and parallel connection
@@solarfacts4242
Best explanation. Sir please provide Excel sheet. I'm very thankful to you for this kindness
Good explain. Pls share excellent file
sir bahut acche se explain kiya hai apne,share the excel sheet please
That is paid you can contact 9871073342
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 .
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Very good
Thanks 🙏
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
Yes you can if voltage is in the range of inverter
Very helpful video sir please share this Excel sheet
useful information for string designing. can you provide an excel sheet?
Yes but that is paid actually
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%
Yes can be done ✅
nice explanation sir. needed excel sheet sir
Sure
Thank you for the information. kindly share the excel sheet
Sure but that is paid please connect 9871073342
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?
Modules in string means no of panels in Series.
How do you calculated voltage change per degree? Is this data also given in module data sheet?
Yes this is in the module datasheet
From where to get the data of per degree change.
From module datasheet
Good explained sir please share Exel sheet
Sure but that paid actually
Your explanation is too good can I get that excel sheet.
You can but that is paid
Great Explanation, please share the excel sheet
That is paid actually
Good Job Bro... 👍 Keep it up... Nice Practical knowledge video..
Thanks
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
Yes current will change
why don't you added the 19 string example as well. If we go for 19 string it values lies in operating range.
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.
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
@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.
Sir aap bahut sahi tarike samajte ho
Sir can you please share excel sheet
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
Thanks you
Inverter maximum DC power, Nominal voltage and string per MPPT you can get from data sheet of inverter
@@solarfacts4242got the information in data sheet, array current with in inverter Max DC current input.
I have created On-grid system design sheet . Will you check it's correctness.
Ya sure
Hi, very good content.informative and structured. I'd appreciate it if you pls share the excel. Thank you
That is paid actually
@@solarfacts4242price please?
mr.Raman. very nice explanation ,Please send me the excel sheet link
OK
Bahut Accha bhai. Please share kariye ye excel sheet.
Ok 👍
Agar hamare 335w9pannel series me h agr ham usi series se 6pannel se loop wire le kar koi load jaiese 9pannel ke positive aur negative 6pannel series ka loop wire se kam volt ka load chalana kaisa hoga
Step by step explanation please share excell sheet for our knowledge
Well explained can I get the excel sheet please ?! Thanks in advance
Sure sir but that is Paid actually please contact 9871073342
Very nice ....plz share ur sheet😊
how we can calculate voltage change per deg C
plz explain
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
That will depend if your string voltage is in range of Inverter voltage then this will work
Exilent explain sir. Shear Excel sheet plzz
Sure sir but that is paid sir
excellent explanation... sir i want this excel sheet.. kindly send me
Thank you
Sir 1 video dcdb and acdb calculation pe banao in detail
Sure
thank you for the video.can you share the excel sheet
Sure but is paid actually
thanks for the info. kindly share the sheet
sure
Nice Video sir👍
please share that excel sheet
Thanks 🙏
Sir inverter me mppt 1 se 10 Tak hai Inka aapas connection Kaise rahta hai inverter ke under
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
Very useful and impressively explained. Requested to share the excel sheet
Thanks
Do you have this sheet
Beautiful Explanation Sir... Can I get the Excel Shit, please!
That is paid actually
Great temperature difference between Inverter module to kya kare
Great work sir share sheet ..
ok
please share string design for 545 wp of Renewsys panels for 100 kw
Hi, Raman , Hope you are doing well, Could you please share excel file with me so that i can practices.
Sure but that is paid please connect 9871073342
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.
Ok
Thanks dear for sharing information please share Excel sheet
Thanks that sheet is paid actually
❤ from Pakistan
Thanks
@@solarfacts4242 kindly sir mery question ka rply dy den.
Which question
Good info.
Please modify as indicated by vishek
Will make a new video
Hi, Raman , Hope you are doing well, Could you please share excel file with me so that i can practice.
Sure but that is paid please connect 9871073342
Very nice ,can you share the Excel sheet with me
That is paid actually
❤
Well explained, pls share sheet
ok
Please share me excel file for this wonderful information
Thant is paid actually
Please send me the Excel sheet format thank you very much
That is paid actually
Hello sir thanks for vedio
Please share excel sheet
@HARSHIT AGARWAL that is paid
Nice Info Plz. Shear me Excle sheet
@mahesh that is paid actually
sir what is the meaning of feed in start voltage
that is the minimum voltage which is required for the starting of the inverter
Sir exal sheet milega kaya
Hello sir please send Excel...... Your solar techer for all beginners
hi, good work, plz share excel sheet.
Sure but that is paid sir
Sir mere inverter me ak problem aa raha hai
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
Ok
Hi dear bhoot khob pdf to day
Thanks sheet is paid actually
How to calculate for central inverter???
Will make one more video for that.
Thanks for your suggestion 🙏
Kindly share this sheet thanks
Sure sir
That is paid actually.
Connect - 9871073342