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!

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.

And thank you for your feedback sir! Much appreciated!

Glad it helped

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.

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 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.

@@OliverJayKZfaq 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.

@@OliverJayKZfaq 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.

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 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.

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.

Thank you sir. Currently, I don't have an autocad license. I am using microsoft visio for my drawings.

Thanks

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.

I only did the drawings in visio. Equipment drawings were custom made.

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.

I wouldn't recommend po. There's risk na masira yung inverter nyo.

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.

@@OliverJayKZfaq Any table po for reference ? Thank you sir sa sagot. 😀

@@OliverJayKZfaq 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. 😊

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

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!

@@OliverJayKZfaq Okay po sir. thank you.

@@EngrWUAV no problem sir

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. :)

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.

@@OliverJayKZfaq 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

@@OliverJayKZfaq sir salamat po

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.

😂

Thanks