Nice & Good explains about Solar DC cable selection & voltage. I have some suggestion to include site minimum to maximum temperature for Vmp calculation. For calculation of Vd(%) you must put the value of Vmp at minimum temperature (For safer side). Otherwise good explain 👍
Excellent explanation very very clear. i have only one doubt in the last regarding inverter cable, its mentioned that the value of P is taken as 3000, could you pls tell how you got this value. once again a JOB WELL DONE.
when u were talking about ground mounted structure since their will be better air circulation so temperature will not increase much so that factor should increase right... but said instead of 0.5 or 0.4 we can take 0.2... please clear this doubt
Basically I mean you can .2 as derating factor for cable current capacity in ground mounted system. Where as when you are laying the cable in ground along with other conduits. You should consider 50percebt derating factor.
Sir, If inverter current rating at STC is 26 A & 40A. If we connect parallel connection of string of 18series x 18parallel & current will be 28-30A. So, is the inverter can run or not? I already selected suitable current rating of cable.
@@_mama_tv pls share the datasheet of the inverter or let me know inverter model, so that i can resolve your query. Also let me know if the plant is going to be on higher altitudes? What will be the max temp in the area
Thanks a lot for this info. I have 18 panels of 585 watt having Short Circuit Current of 14.55 amp. Plus Solis Ongrid 10kw 3 phase inverter. I want 2 strings of 9 panels each. The distance from panels to inverter is 100 feet or 31 meters. Can you plz suggest either I use 6mm or 4 mm cable?
Nice video..I am having a query .. If i am going to connect 7strings (in each string modules having 380Watt *11Nos. of modules) in parallel in combiner box and want to make a single input from combiner box to the Inverter, then what would be the cable size for that ?
Bro, Can we consider the ((0.5 x 0.8)(as you said in this video))Correction factors as derating factors, because In some youtube videos, for current carrying capacity they are multiplying with derating factor, can you please clear my doubt. Thanks You in Advance
9:18 u said we should use 6sqmm cable for distance more then 50m but in the voltage drop calculation we calculated for 4sqmm only while our one way distance is 70mtrs why is that??
See first you should consider the cable as per rating, as you can see 4SQMM can carry considered current. But it didn’t the criteria of voltage drop so we choose the next size
Can I have a simple explanation it was too techinal..for a 2kw system the distance between panel and Inverter is 100 ft..what size DC cable should b used?
From where to where ? From panel to inverter use 4sqmm (if panels are in series) If the panels are in parallel and distance is more than 10 m then I suggest to go for 6sqmm cable. From inverter to battery : consider maximum output current of inverter. For 2km it is around 9 to 10Amps. 6sqmm should be more than sufficient (incase your load is only ac and less than 2kW)
How can current increase with grouping factors and temperature factors? Dccc should be calculated by dividing the current of the cable by the derating factors and you will get the actual current that will flow in the cable...
Current is not increasing in the calculation. It just means by adding derating factors and all. You need to choose such cable that is rated for that current.
SIR...mere ghar pe vendor ne WAAREE 540 WATT MONO PERC HALF CUT 5 PANEL lagaya hai....Jisme se ek panel me kuch Square(jisme 9 bus bar hai) BLACK colour ka hai aur kuch Square BLUE colour ka hai? Aisa ku hai Sir.... Baaki 4 panel complete Black colour ka hai... Kya duolicate to nahi h panel ya koi manufacturing defect hai ya Normal hai? PLease batayiye Sir....🙏 Sabhi 5 Panel 3.3 KW inverter ke sath laga hua hai aur work kar rha hai.... Avi Net Metering nahi hua isliye System ka full capacity pata nahi chal paa rha hai... isliye puch rha hu sir.....
Good question anamay, It has many reasons. 1. important reason is like I said in the video it is because all the module manufacturers use 4sqmm cable at output. 2. connection of module in parallel is also required in off grid and other applications so I should carry that current. 3. is the termination problem with 2.5sqmm cable. For strength and durability. 4. The resistance of the cable is high that will lead to more losses at high temperatures at application is in sun.
For my 10 kw solar system, i have 10 panels per string(total 2 strings), each panel short circuit current was 13.93. Can you kindly suggest the DC cable size for best results? Thanks 🙏
We have 8 modules of 8 amp...each....connected 4in series then parrallel....the distance from module to battery is 30mtr ....which wire should we use from Array junction box to Battery for 30mtr distance
Sir, i jave installed a 3KW Ongrid solar system in my home, there is total 5 Panels of 540Watt of WAAREE brand and a Growatt inverter of 3.3 Kw and the distance between the PANELS and inverter is approx 12 metre, and the installer used 6sq mm wire, As of now, installer gave supply of solar plant into my home through the use of ZERO EXPORT DEVICE, The issue is that the Voltage is dropping (like if it is 218-220 volts, and when i increase the load like 1500-2000 watt, the voltage drops to 180-190 volts and stay here until i decrease the load) and it also take Ampere from my Grid smart meter but WATT remains around Zero in Grid smart meter....means that watt is supplied by solar inverter but it starts to take some ampere from my grid meter.....and this is clearly visible when i turn the WATER MOTOR of 1 hp then it quickly start to take Ampere from the Grid meter.... I don't know why this is happening, i asked to my vendor but they are not responding as they should be....thats why i need help in figuring out that what's the problem... Please help me....if you do tell me where is the problem, i can easily get it corrected....
@@electrical-sajid DC cable length from PANEL to DCDB is approx 11-12 metres and is of 6 sq mm, and from DCDB to Inverter is less than 0.5 Metre and of 6 Sq mm, and AC cable length from INVERTER to ACDB is also 0.5 Metre and of 4 Sq mm, and from ACDB to LOAD is 1 Metre, and of 6 Sq mm.... that's it Sir.
@@electrical-sajid Sir, There is also POWER FACTOR fluctuation when Solar system works, like it fluctuates as 0.9-0.6-0.8-0.9-0.7-0.2 and even it goes into minus sometimes....and again comes close to 1 and then repeat like this....but when i disconnect solar system through inverter and ACDB then POWER FACTOR constantly remain close to 1 (like 0.999-0.998)
@@electrical-sajid can you please share one cable data sheet as a reference for Undergroung cable laying.Because i cannot find .Will be helpful.Thank you
What if I want to power led lights directly from battery. The maximum cable length wud b 40mtrs battery12v to led lights. Do I still need to worry about voltage drop? Will it work?
What is the total wattage of your lighting system ? For 40m, the power loss will be more. You need to size your battery accordingly. If possible use cable with some more cross section area.
@@electrical-sajid I have tall tubular batteries 200ah. But battery size was not the question. I.m worried about the voltage drop/power loss. Ex. Each room has 2 led lights 1bdlc fan.. lets assume 100watts. So. 100 watts at a distance of 40mtrs. it's a 3bedrm + 1 living rm. So plan to run seperate circuits to each room. Where the farthest room is 40mtrs.
@@electrical-sajid in your Vid. You say that 4mm cables upto 55mtrs. Solar panel to battery. Power loss is about 1%. How is that different for 4mm cables running from batt. To room? Or have I misunderstood.
Hello nabeel, dc cable length will depend upon your site conditions. How far is your inverter from the module of the strings. For approximate calculation consider 4sqmm cable for distance upto 50m. And 6sqmm for above
@@mohammadumar443 798V is my string voltage. For domestic purpose you can consider 48 V ( depending upon your inverter dc input voltage and module configuration).
@@electrical-sajid and other thing you have considered such huge voltage and you have considered .. single strip in your Isc calculation .. how illogical is it?
It is a very good video that gives more information about the cable selection. Thank you
Great video. ...i was in need of this....had little doubts....but after seeing your video .....all my doubts are clear now. Thank you
Thank you for adding this video. Great work and explanation.
Great videos Electrical Engineering! This is exactly what I've been looking for!
Nice & Good explains about Solar DC cable selection & voltage. I have some suggestion to include site minimum to maximum temperature for Vmp calculation. For calculation of Vd(%) you must put the value of Vmp at minimum temperature (For safer side). Otherwise good explain 👍
for voltage drop calculation how you selected the I=8.6A , and how you assumed the string voltage is 798V, please comment for below
I didn't assumed, 8.6 is my string current. And 798 is my string voltage
Excellent explanation very very clear. i have only one doubt in the last regarding inverter cable, its mentioned that the value of P is taken as 3000, could you pls tell how you got this value. once again a JOB WELL DONE.
I have considered the inverter capacity as 3kW i.e. 3000.
thanks
COOP
...
when u were talking about ground mounted structure since their will be better air circulation so temperature will not increase much so that factor should increase right... but said instead of 0.5 or 0.4 we can take 0.2... please clear this doubt
Basically I mean you can .2 as derating factor for cable current capacity in ground mounted system.
Where as when you are laying the cable in ground along with other conduits. You should consider 50percebt derating factor.
Where did you get the 798 volts that you compare the voltage drop from?
Thankyou for such informative video
Sir, please tell me which software are you using for SLD design.
For SLD we are using autoCAD
Thank you sir
Sir, If inverter current rating at STC is 26 A & 40A. If we connect parallel connection of string of 18series x 18parallel & current will be 28-30A. So, is the inverter can run or not? I already selected suitable current rating of cable.
40A short ckt current rating of inverter.
@@_mama_tv pls share the datasheet of the inverter or let me know inverter model, so that i can resolve your query. Also let me know if the plant is going to be on higher altitudes? What will be the max temp in the area
Great work, thanks for this video and please keep uploading.
Yes,
Soon we will upload a new video
Thanks a lot for this info.
I have 18 panels of 585 watt having Short Circuit Current of 14.55 amp. Plus Solis Ongrid 10kw 3 phase inverter.
I want 2 strings of 9 panels each.
The distance from panels to inverter is 100 feet or 31 meters.
Can you plz suggest either I use 6mm or 4 mm cable?
Please refer dc cable sizing video for cable size calculation
It was simple and mind blowing. Thanks ♥️ Love from Pakistan
Thank you
@@electrical-sajid the value of I you selected at end is wrong. don't put in false information in website.
‰voltage drop calculation Result is right but the numerator should be in denemoneter and vice versa...
Nice video..I am having a query ..
If i am going to connect 7strings (in each string modules having 380Watt *11Nos. of modules) in parallel in combiner box and want to make a single input from combiner box to the Inverter, then what would be the cable size for that ?
What is distance of the combined box to inverter?
Im doing a wiring but i would like to know if my wire is 25m in one direction would 6sqmm be okay
Thankyou
Ofcourse
Why I=8.6 at voltage drop formula,
Its I sort circuit?
Bro, Can we consider the ((0.5 x 0.8)(as you said in this video))Correction factors as derating factors, because In some youtube videos, for current carrying capacity they are multiplying with derating factor, can you please clear my doubt. Thanks You in Advance
It clearly depends on what project type is it underground cable laying ?
@@electrical-sajid no, it is on rooftop either pvc conduit or perforated cable trays
@@racermafia1854 how many cables together in conduit?
Hi if we want to calculate the cable size from PV panels to charge controller for of grid PV system is the same procedure?
Yes
Thanks also it's the some for mppt or PWM controller?
@@gzoro1 yes
What's the difference if we don't use NEC conditions?
7.33/798
Hi you!
Where does the temperature correction factor in the table come from?
9:18 u said we should use 6sqmm cable for distance more then 50m
but in the voltage drop calculation we calculated for 4sqmm only while our one way distance is 70mtrs
why is that??
See first you should consider the cable as per rating, as you can see 4SQMM can carry considered current. But it didn’t the criteria of voltage drop so we choose the next size
Can I have a simple explanation it was too techinal..for a 2kw system the distance between panel and Inverter is 100 ft..what size DC cable should b used?
From where to where ?
From panel to inverter use 4sqmm (if panels are in series)
If the panels are in parallel and distance is more than 10 m then I suggest to go for 6sqmm cable.
From inverter to battery : consider maximum output current of inverter. For 2km it is around 9 to 10Amps.
6sqmm should be more than sufficient (incase your load is only ac and less than 2kW)
Sir where did you get this table
How can current increase with grouping factors and temperature factors?
Dccc should be calculated by dividing the current of the cable by the derating factors and you will get the actual current that will flow in the cable...
Current is not increasing in the calculation. It just means by adding derating factors and all. You need to choose such cable that is rated for that current.
How come % drop = 798/7.33 becomes 0.198?
Sir i have 165watt 12v 3 panel is 4 mm dc cable suitable for this??
Depends on distance.... What is the distance from panel to inverter or charge controller
Better you go with 6sqmm
@@electrical-sajid 9 meter distance
@@tswain2552 pls go for 6sqmm it will be better
@@electrical-sajid thanku so much sir for your support 🥰🥰🥰
SIR...mere ghar pe vendor ne WAAREE 540 WATT MONO PERC HALF CUT 5 PANEL lagaya hai....Jisme se ek panel me kuch Square(jisme 9 bus bar hai) BLACK colour ka hai aur kuch Square BLUE colour ka hai? Aisa ku hai Sir....
Baaki 4 panel complete Black colour ka hai...
Kya duolicate to nahi h panel ya koi manufacturing defect hai ya Normal hai?
PLease batayiye Sir....🙏
Sabhi 5 Panel 3.3 KW inverter ke sath laga hua hai aur work kar rha hai....
Avi Net Metering nahi hua isliye System ka full capacity pata nahi chal paa rha hai... isliye puch rha hu sir.....
Photos mail kijiye . Sajidsayyad3@gmail.com
@@electrical-sajid ok bhaiya, abhi kar rha hu....Thank you so much...❤️
from where current value came 8.6 in voltage drop calculations
Please explain selection of 4sqmm cable even when u have derived 2.5 sqmm cable from current calculation
Good question anamay,
It has many reasons.
1. important reason is like I said in the video it is because all the module manufacturers use 4sqmm cable at output.
2. connection of module in parallel is also required in off grid and other applications so I should carry that current.
3. is the termination problem with 2.5sqmm cable. For strength and durability.
4. The resistance of the cable is high that will lead to more losses at high temperatures at application is in sun.
For my 10 kw solar system, i have 10 panels per string(total 2 strings), each panel short circuit current was 13.93.
Can you kindly suggest the DC cable size for best results?
Thanks 🙏
4sqmm
@@solaroperationmaintenance1668
Thanks for the response..Meanwhile, we have installed using 6sqmm cable, hope that should be more than enough..
Ya, I got it, string voltage right
how did you find the value of over irradiance ?
We have 8 modules of 8 amp...each....connected 4in series then parrallel....the distance from module to battery is 30mtr ....which wire should we use from Array junction box to Battery for 30mtr distance
4sqmm cable
Sir, i jave installed a 3KW Ongrid solar system in my home, there is total 5 Panels of 540Watt of WAAREE brand and a Growatt inverter of 3.3 Kw and the distance between the PANELS and inverter is approx 12 metre, and the installer used 6sq mm wire,
As of now, installer gave supply of solar plant into my home through the use of ZERO EXPORT DEVICE,
The issue is that the Voltage is dropping (like if it is 218-220 volts, and when i increase the load like 1500-2000 watt, the voltage drops to 180-190 volts and stay here until i decrease the load) and it also take Ampere from my Grid smart meter but WATT remains around Zero in Grid smart meter....means that watt is supplied by solar inverter but it starts to take some ampere from my grid meter.....and this is clearly visible when i turn the WATER MOTOR of 1 hp then it quickly start to take Ampere from the Grid meter....
I don't know why this is happening, i asked to my vendor but they are not responding as they should be....thats why i need help in figuring out that what's the problem...
Please help me....if you do tell me where is the problem, i can easily get it corrected....
Can you share the cable length and size used in the project for Ac and dc
@@electrical-sajid DC cable length from PANEL to DCDB is approx 11-12 metres and is of 6 sq mm, and from DCDB to Inverter is less than 0.5 Metre and of 6 Sq mm, and AC cable length from INVERTER to ACDB is also 0.5 Metre and of 4 Sq mm, and from ACDB to LOAD is 1 Metre, and of 6 Sq mm.... that's it Sir.
@@electrical-sajid Sir, There is also POWER FACTOR fluctuation when Solar system works, like it fluctuates as 0.9-0.6-0.8-0.9-0.7-0.2 and even it goes into minus sometimes....and again comes close to 1 and then repeat like this....but when i disconnect solar system through inverter and ACDB then POWER FACTOR constantly remain close to 1 (like 0.999-0.998)
While calculating the voltage drop where did you get the value I=8.6 from?
Its is from solar panel data sheet.
As the current in one string will be equal to Imp mention on datasheet.
@@electrical-sajid so why you calculate 35.5 Amp if you have to consider o/p current of panel (8.6Amp)
@@ashishsoni7247 exactly
@@electrical-sajid please clear sir and length you have consider 70 mtr is it right
Kindly share the table
can you please mention or share charts for underground burried cables for temperature correction factor
Kindly consider the cable datasheet provided by the cable manufacturer
@@electrical-sajid can you please share one cable data sheet as a reference for Undergroung cable laying.Because i cannot find .Will be helpful.Thank you
@@khajamudabbirahmed6406 polycab.com/product-brochures/cable-brochures/
@@electrical-sajid is there any particular pdf for DC cables only
What if I want to power led lights directly from battery. The maximum cable length wud b 40mtrs battery12v to led lights.
Do I still need to worry about voltage drop? Will it work?
What is the total wattage of your lighting system ? For 40m, the power loss will be more. You need to size your battery accordingly.
If possible use cable with some more cross section area.
@@electrical-sajid I have tall tubular batteries 200ah. But battery size was not the question. I.m worried about the voltage drop/power loss.
Ex. Each room has 2 led lights 1bdlc fan.. lets assume 100watts.
So. 100 watts at a distance of 40mtrs. it's a 3bedrm + 1 living rm.
So plan to run seperate circuits to each room. Where the farthest room is 40mtrs.
@@RitinPali yeah I got your point. That's why I said size your cable accordingly. 2.5Sqmm will be more than sufficient.
@@electrical-sajid in your Vid. You say that 4mm cables upto 55mtrs. Solar panel to battery. Power loss is about 1%.
How is that different for 4mm cables running from batt. To room?
Or have I misunderstood.
@@electrical-sajid the whole point is to bypass the inverter and save on power loss due to conversion of dc to ac then ac to dc.
Apki urdu main hay video
Hello,
From where you consider the derating factor..?
Is any IEC/IS available..?
As per NEC
600 feet??
I wanna know DC Copper Cable Length Sizing Formula. Please tell me the Formula.
Hello nabeel, dc cable length will depend upon your site conditions. How far is your inverter from the module of the strings. For approximate calculation consider 4sqmm cable for distance upto 50m. And 6sqmm for above
their is no formula you need to check for voltage drop and cable carrying capacity. refer the video
@@electrical-sajid where did you get 798V for voltage drop.. .Solar system voltage can be maximum 48V in domestic case ?
@@mohammadumar443 798V is my string voltage. For domestic purpose you can consider 48 V ( depending upon your inverter dc input voltage and module configuration).
@@electrical-sajid and other thing you have considered such huge voltage and you have considered .. single strip in your Isc calculation .. how illogical is it?
IN %VD= 798?