Just found your channel and enjoyed it immensely. Plan on doing a solar array on my house. Looked briefly at your "about" page and seen you are from Singapore. I graduated in 1976 at Singapore American School on King's Road. Enjoyed my time there. Have a good day and thanks again.
Thanks for sharing. In this four panel setup is there not a need for optimizers? I’ve only installed four panels as an addition to an existing system not standalone. Thanks again.
Hello sir, not sure which optimizers you are referring to. Can you please site some examples? I will have to read and let you know my comments. For this tutorial, the objective is to have a basic setup only.
Hi, I thought the inverter capacity should be lower than the array capacity (say P_inv = 0.8 x P_array) to avoid oversizing. Glad to hear your comments on this? Thank you.
Hi sir, this is the first time i've heard of this, that the inverter capacity is lower than the PV array. Can you give me a link to this reference so I can read more on this concept? A good engineering practice is to not overdrive your electronic equipment as to prolong its life span, that is why we design the inverter capacity to be higher than the PV array. Also, it is good to add some extra buffer capacity to your inverter to make it ready for the additional power consumption of your home in the future (future proofing). If you have that extra inverter capacity, you can just add PV panel/s to keep up with your growing energy needs.
@@OliverJayUA-cam Thank you for the explanation. I totally agree with the point of keeping buffer for further expansion. As for the undersizing of inverter, I've found some sources suggesting to keep the DC/AC ratio of 1.2 to 1.4. That means, for 130 kWp (DC), we may use 100 kW Inverter, thus the DC/AC ratio will be 1.3. Note that PV power is kilowatt-peak under STC condition, thus this is not always the case in real situation. This is one of the articles suggesting DC/AC ratio of more than 1.0: 😃👍 news.energysage.com/what-size-solar-inverter-do-i-need/
Hi @syamirulm, thanks for the link. I do agree with this article. Undersizing of the inverter can be done if the geographic location affects/limits the amount of sunlight harvested by the solar array. Else, if you are living near the equator, 1:1 or inverter oversizing will be the usual scenario.
Hello sir, dc/ac isolator performs like a switch. It disconnects certain oarts of your circuit and is especially useful during repair and maintenance. Regarding SPD, i still recommend installing an external one as it is easier to replace than having to open your inverter. Also, there are many types of SPDs, there are those used for lightning protection and the ones that catches residual surges and are placed near the equipment being protected.
Hi, the 1.3 constant means we've added 30% increased capacity to our PV array. This is to compensate for not so optimum weather conditions such as cloudy skies. You may adjust this constant as you like.
Hello sir, seems high. Do you have a lot of Aircons at home? Our monthly consumption for a 3-bedroom house is around 600kwh per month. We turn ON our ACs only during the night.
Hi Oliver, for On-grid system, kindly elaborate the connection detail on main circuit panel. as per your diagram the AC isolator is directly connected to MCP. Thanks
yes it is directly connected to the service panel through a spare breaker equal to the ac MCB. there are three options to connect the inverter to the grid.
Hi sir, yes, you can also put SPD near the load. As far as I know there are 3 types of SPD, first is the lightning arrester which is placed near the PV panels, second is placed near the sensitive loads, and third one is placed is between.
For the Surge protection, take a look at the Uc and Up values of your SPD. Uc is the maximum continuous operating voltage, if the SPD senses a voltage above this, it becomes active. Up, on the other hand, is the maximum voltage across the SPD when it is active. Up is selected as such that it is below the overvoltage withstand capability of the loads. A typical DC SPD has a Uc of around 500 VDC and a Up of ~2kV.
@@vellyyt3572 Hello sir, wala po akong table. Di ko din expertise tong SPD. 😁 As far as I know, may 3 types, classified according to the frequency of the surge. Type 1 is installed near the panels for protection against lightning. Type 2 is installed between the source and the load, for added protection. Type 3 is installed near the load to redirect any residual surges - good for loads that are very sensitive to fluctuations. There are SPDs that can cater for both Type 1 and Type 2.
Helloo amazing video ♥️ when u choose circuit breaker why you choose a value more than the value calculated? The value you choose shouldn't be less than calculated to protect the circuit? Thank you
Hello sir, in Step 3 (sizing the inverter), we did a check on the inverter size vs. the PV array. We have assumed 4x PV panels connected in series (hence, string = 1). When the 4x PV panels are connected in series, the total Voltage output is still within the allowed Vin of the inverter. Likewise, the Isc (9.94A) is below the allowed input current of the chosen inverter (10A). If, for example, we configure the PV array into two (2) strings, the total voltage output of the PV array will decrease to half but the Isc will double and more than the allowable inverter input current of 10A. This is the reason why we chose a PV string of only 1.
Hello bro! The 1.3 is just a buffer on the panel capacity as the sun peak hours vary from day to day. So, 1.3 means additional 30% solar panel capacity.
Sir sana masagot po tanong ko. Ung utility ng meralco ay 220v L-L diba po? Pano ko po i wwire ng tama sa inverter po kung ang output ng inverter ay L/N/PE , 220Vac, 230Vac, 240Vac ang nakalagay po. Model po ng sofar2700TL-G3
Hello sir, morning! Di rin ako sigurado sir. As per research ko, some areas are L-N 240V and some areas are L1-L2 240V AC with neutral center tap. Yung neutral, however, di na pumapasok sa bahay and mukhang grounded na sa utility poles jan. Mas maganda sir na pa-check nyo na lang sa local electrician jan sa inyo para iwas aksidente.
Okay lng po kahit nd na icheck ung watts ng mga appliances for inverter sizing???napansin ko po magkaibaung sizing nag inverter ng off grid at on-grid kasi sa off grid is nakabase sa watts ng loads or appliances(load watts > inverter) while on grid binase sa wattage ng pv power.(pv power(Watts) > inverter)..tama po ba ung observation at pagkakaintindi ko sir?
Yes sir, parang ganun na nga. Mas mabusisi lang yung computation ng offgrid kasi kelangan i-take into consideration ang surge power ng appliances. Sa on-grid ok lang kahit mas mababa ang capacity ng panels and inverter mo versus sa actual load kasi nakaalalay naman lagi yung grid power.
Hi Jenelyn, wala po akong actual illustration pero yung on-grid inverter mo may output yan for the limiter, then yung other end is icclip mo sa utility line mo bago pumasok ng distribution switch mo. For actual application po, check nyo po yung installation manual ng specific inverter mo. :)
sir meron akong 600w grid tie inverter at dalawang solar panel na tig 150w na may voc na 21.8 at isc na 10.2A ano much na dc breaker at ac breaker po sa kanya pa help nman po para mainstall ko po . tnx sir ng marami.
Hello sir, if naka-series yung panel mo, dc breaker should be greater thAn 10.2AT (ex. 12 AT DC CB). If naka-parallel naman, go with greater than 20.4AT (ex. 22 AT). For AC CB naman,it should be 600W/220V or around 3AT or higher.
You are not considering the peak hours with the highest demand for electricity in the home and the hours when your system will have the highest and lowest performance
Hello sir, it's already inclusive when you take the average daily consumption from your monthly bill. For grid-tie setup, it doesn't matter much since the your PV system and the grid will be complementary.
Hello please where did you get 1.3
Excellent presentation Sir. Thank you for adding value in my knowledge
Just found your channel and enjoyed it immensely.
Plan on doing a solar array on my house.
Looked briefly at your "about" page and seen you are from Singapore.
I graduated in 1976 at Singapore American School on King's Road.
Enjoyed my time there.
Have a good day and thanks again.
Hi Patrick! Thanks for the comment!
The SAS is no longer at King's Rd, they've moved to a new location at Woodlands.
Have a great day!
The PV power equation why was there 1.3 multiplied?
Hello ma'am, please where did you get 1.3?
Thanks my dear teacher for your explanation of this lesson which is important us and specially me because of am electrician🖒🖒🖒❤.
And thank you for your feedback sir! Much appreciated!
is there any textbooks or technical writings you could recommend
Hi, I would like to ask where does the 1.3 coming from?
Thanks for sharing. In this four panel setup is there not a need for optimizers? I’ve only installed four panels as an addition to an existing system not standalone. Thanks again.
Hello sir, not sure which optimizers you are referring to. Can you please site some examples? I will have to read and let you know my comments. For this tutorial, the objective is to have a basic setup only.
If the grid goes down, does this system stay up, as long as it's already running?
Hi, I thought the inverter capacity should be lower than the array capacity (say P_inv = 0.8 x P_array) to avoid oversizing. Glad to hear your comments on this? Thank you.
Hi sir, this is the first time i've heard of this, that the inverter capacity is lower than the PV array. Can you give me a link to this reference so I can read more on this concept?
A good engineering practice is to not overdrive your electronic equipment as to prolong its life span, that is why we design the inverter capacity to be higher than the PV array.
Also, it is good to add some extra buffer capacity to your inverter to make it ready for the additional power consumption of your home in the future (future proofing). If you have that extra inverter capacity, you can just add PV panel/s to keep up with your growing energy needs.
@@OliverJayUA-cam Thank you for the explanation. I totally agree with the point of keeping buffer for further expansion.
As for the undersizing of inverter, I've found some sources suggesting to keep the DC/AC ratio of 1.2 to 1.4. That means, for 130 kWp (DC), we may use 100 kW Inverter, thus the DC/AC ratio will be 1.3.
Note that PV power is kilowatt-peak under STC condition, thus this is not always the case in real situation. This is one of the articles suggesting DC/AC ratio of more than 1.0: 😃👍
news.energysage.com/what-size-solar-inverter-do-i-need/
Hi @syamirulm, thanks for the link. I do agree with this article. Undersizing of the inverter can be done if the geographic location affects/limits the amount of sunlight harvested by the solar array. Else, if you are living near the equator, 1:1 or inverter oversizing will be the usual scenario.
@@OliverJayUA-cam Perfect, that makes very sense. Thank you for the explanation and all the best creating more videos like this 😃👍
Thank you too bro for a very engaging discussion.
Thanks for sharing that. Try avoid the monotone voice and speak with energy, it makes hard to follow you with that voice.
What is the purpose of DC and AC isolator? Also, do we need to install DC and AC SPD in case there is a build in SPD in the inverter? Thank you.
Hello sir, dc/ac isolator performs like a switch. It disconnects certain oarts of your circuit and is especially useful during repair and maintenance. Regarding SPD, i still recommend installing an external one as it is easier to replace than having to open your inverter. Also, there are many types of SPDs, there are those used for lightning protection and the ones that catches residual surges and are placed near the equipment being protected.
why do you multiply by1.3?
is there any software to simulate it?
What is 1.3 constant stands for? Does it differ from country to another country?
Hi, the 1.3 constant means we've added 30% increased capacity to our PV array. This is to compensate for not so optimum weather conditions such as cloudy skies. You may adjust this constant as you like.
Hi Oliver, are we not over-compensating by 30%, i thought 10% is good enough. please elaborate
hey sir. my monthly consumption is 5100 kwh. does it make sense?
Hello sir, seems high. Do you have a lot of Aircons at home? Our monthly consumption for a 3-bedroom house is around 600kwh per month. We turn ON our ACs only during the night.
really very informatvie. sir kindly make a video on designing and drawing of SLD of solar systems in AutoCad
Thank you sir. Currently, I don't have an autocad license. I am using microsoft visio for my drawings.
hi sir, where did you got 220V for Iac=Wp/V at AC CB formula.
ty for this idea
very very helpful
Glad it helped
Hi Oliver, for On-grid system, kindly elaborate the connection detail on main circuit panel. as per your diagram the AC isolator is directly connected to MCP. Thanks
yes it is directly connected to the service panel through a spare breaker equal to the ac MCB. there are three options to connect the inverter to the grid.
Hello, Good afternoon, if if we calculate the # of PV to be 8, how can we calculate the strings?
Oliver, input from inverter basically connected with Grid AC correct?
Why AC SPD not connected on grid input, so it will protect load too?
Hi sir, yes, you can also put SPD near the load. As far as I know there are 3 types of SPD, first is the lightning arrester which is placed near the PV panels, second is placed near the sensitive loads, and third one is placed is between.
which software is used for drawing?
I only did the drawings in visio. Equipment drawings were custom made.
Hi Sir, how about the spd? How to compute for its rating?
For the Surge protection, take a look at the Uc and Up values of your SPD. Uc is the maximum continuous operating voltage, if the SPD senses a voltage above this, it becomes active. Up, on the other hand, is the maximum voltage across the SPD when it is active. Up is selected as such that it is below the overvoltage withstand capability of the loads. A typical DC SPD has a Uc of around 500 VDC and a Up of ~2kV.
@@OliverJayUA-cam Any table po for reference ?
Thank you sir sa sagot. 😀
@@OliverJayUA-cam and also sir. Do you have any idea that an existing gridtie system can have a battery back up?
@@vellyyt3572 Hello sir, wala po akong table. Di ko din expertise tong SPD. 😁
As far as I know, may 3 types, classified according to the frequency of the surge. Type 1 is installed near the panels for protection against lightning. Type 2 is installed between the source and the load, for added protection. Type 3 is installed near the load to redirect any residual surges - good for loads that are very sensitive to fluctuations. There are SPDs that can cater for both Type 1 and Type 2.
@@vellyyt3572 You may go for hybrid set-up sir. You can design a hybrid setup with battery backup.
If naka-setup na yung on-grid mo, just add UPS. 😊
Helloo amazing video ♥️ when u choose circuit breaker why you choose a value more than the value calculated? The value you choose shouldn't be less than calculated to protect the circuit? Thank you
Many thanks for valuable study , appreciate if you can share the excel sheets
thanks for sharing your knowledge..any information on the export limiter and anti islanding device. Are they not required by the utility company?
thanks
How did you come up with " 1 " in no. of strings in your calculation of sizing a DC Circuit breaker?
Hello sir, in Step 3 (sizing the inverter), we did a check on the inverter size vs. the PV array. We have assumed 4x PV panels connected in series (hence, string = 1). When the 4x PV panels are connected in series, the total Voltage output is still within the allowed Vin of the inverter. Likewise, the Isc (9.94A) is below the allowed input current of the chosen inverter (10A).
If, for example, we configure the PV array into two (2) strings, the total voltage output of the PV array will decrease to half but the Isc will double and more than the allowable inverter input current of 10A. This is the reason why we chose a PV string of only 1.
ano ba dapt iconsider voc ng inverter o vmp ?
Can u make video talking about MPPT
Hi! Thanks for this amazing video, may I ask where did you get the 1.3 multiplier when you were explaining the Sizing of Solar PV Panels?
Hello bro! The 1.3 is just a buffer on the panel capacity as the sun peak hours vary from day to day. So, 1.3 means additional 30% solar panel capacity.
Thanks
Sir sana masagot po tanong ko. Ung utility ng meralco ay 220v L-L diba po? Pano ko po i wwire ng tama sa inverter po kung ang output ng inverter ay L/N/PE , 220Vac, 230Vac, 240Vac ang nakalagay po. Model po ng sofar2700TL-G3
Hello sir, morning! Di rin ako sigurado sir. As per research ko, some areas are L-N 240V and some areas are L1-L2 240V AC with neutral center tap. Yung neutral, however, di na pumapasok sa bahay and mukhang grounded na sa utility poles jan. Mas maganda sir na pa-check nyo na lang sa local electrician jan sa inyo para iwas aksidente.
Pano po pag ang PV ARRAY ISC 11.53A > MAX INPUT CURRENT 11A, ok lang po ba?
I wouldn't recommend po. There's risk na masira yung inverter nyo.
Okay lng po kahit nd na icheck ung watts ng mga appliances for inverter sizing???napansin ko po magkaibaung sizing nag inverter ng off grid at on-grid kasi sa off grid is nakabase sa watts ng loads or appliances(load watts > inverter) while on grid binase sa wattage ng pv power.(pv power(Watts) > inverter)..tama po ba ung observation at pagkakaintindi ko sir?
Yes sir, parang ganun na nga. Mas mabusisi lang yung computation ng offgrid kasi kelangan i-take into consideration ang surge power ng appliances.
Sa on-grid ok lang kahit mas mababa ang capacity ng panels and inverter mo versus sa actual load kasi nakaalalay naman lagi yung grid power.
Please use english for your auestions
New subscriber here..Bakit po may "1.3" sir? bakit ung ibang computation ng grid tie is kahit hindi na minumultiply sa 1.3 sir?
Hi Sir, 1.3 is just for buffer, to compensate for not so optimal conditions like cloudy skies. You may opt to skip this step. Cheers!
@@OliverJayUA-cam Okay po sir. thank you.
@@EngrWUAV no problem sir
I love your voice😅
😂
pwdd po b makahingi ng diagram with limiter po? wla po kc sa illustration po
Hi Jenelyn, wala po akong actual illustration pero yung on-grid inverter mo may output yan for the limiter, then yung other end is icclip mo sa utility line mo bago pumasok ng distribution switch mo. For actual application po, check nyo po yung installation manual ng specific inverter mo. :)
sir meron akong 600w grid tie inverter at dalawang solar panel na tig 150w na may voc na 21.8 at isc na 10.2A ano much na dc breaker at ac breaker po sa kanya pa help nman po para mainstall ko po . tnx sir ng marami.
Hello sir, if naka-series yung panel mo, dc breaker should be greater thAn 10.2AT (ex. 12 AT DC CB). If naka-parallel naman, go with greater than 20.4AT (ex. 22 AT).
For AC CB naman,it should be 600W/220V or around 3AT or higher.
@@OliverJayUA-cam thanks po sir
kung 15amps dc sir gamitin ko kc walang 12amps sa market po eh. salama po.
@@jhonreyes5681 ok lang sir. Basta wag lang masyadong malayo sa computed value natin
@@OliverJayUA-cam sir salamat po
You are not considering the peak hours with the highest demand for electricity in the home and the hours when your system will have the highest and lowest performance
Hello sir, it's already inclusive when you take the average daily consumption from your monthly bill. For grid-tie setup, it doesn't matter much since the your PV system and the grid will be complementary.
Nice
Thanks
Thanks
Nice
Thanks