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It is a common practice to include a safety margin of 25% to ensure the MCB can handle slight overcurrent conditions without tripping unnecessarily. This margin accounts for variations in sunlight intensity and temperature, which can affect the current produced by the panels. Safety Margin CURRENT = Total CURRENT × 1.25 28 AMPS × 1.25 = 35 amps Select the Circuit Breaker Rating: The MCB should be rated slightly above the calculated safety margin current. Standard DC MCB ratings are usually available in steps such as 32A, 40A, 50A, etc. Since 35 amps is not a standard MCB rating, you should select the next highest rating. In this case, a 40A MCB would be appropriate. Remember the fuses as well for protection of reverse current on each string 4 fuses and would be 20A Select it wisely, search Depending how you will parallel it, you would either get 2P 40A DC MCB Non Polarity.

www.amazon.com/ONCCY-Miniture-40-Overload-Protection/dp/B0CNJG91ZH/ref=sr_1_1_sspa?crid=387X092S7UA3L&dib=eyJ2IjoiMSJ9._-h0riltXijmhUZU9HnJzpeDGJFhu-nYb2xMwYEPjSD-bdBbGaCRxFzaa5CsRrA8AmveMnew3oXN65gUIZf6LhhLQmsIHW0zj4AkAQpk1rAayUEULuHxsrLQjRLDuMZjuZ4SadhOzbIGzR_CesA1OYOGrRx5iQY13p5wDP-3M2VF-cloQZnyiFr9YcoYA4qH.3YwYp-uXbeCDGYG9akhbQ6nQ21jgiJ9G34GNQ3dDp5Y&dib_tag=se&keywords=4%2Bpole%2B40a%2Bdc%2Bmcb%2Bnon%2Bpolarity&qid=1716184666&sprefix=4pole%2B40a%2Bdc%2Bmcb%2Bnon%2Bpolarity%2Caps%2C531&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&th=1

Thank you, appreciate

Thank you I see what you mean, I did edit it, not sure when it will reflect

Great pleasure

No DC Volts and AC Volts and equipment are totally different. Your DC will also change alot depending on the sun. You might look at Micro inverter if you want to work from the panels

All, don't think so, but make sure from manufacturers, don't trust distributors. Most don't even know the difference

They are cheaper, if used correctly they do the job, but it is very confusing for lots of people, installers etc. The problem will be human error, lots of it in South Africa,

It is very difficult to say on most brands, but use a washer, if it has magnet inside it is polarity breaker. Search and seek manufacturers specs. I want to say if they don't have + and - marking on the terminal screws it mostly would be Non-Polarity MCB

That is true, we see problems with small scale solar plants with 50 kW-150 kWHigh voltage systems, cables run very far underground in conduit into 1 PV Combiner box in the control room. Technology moves so fast and everyone push to get UN targets for 2030. SAFETY....

@@ltvtech the sadness is. The world nolonger seeks advancement in any tech field.. we are controlled by investors strapped by their over promissed portfolio. WE ARENT MOVING FORWARD. ok getting on the soapbox as you see doesnt work..become scientists again..actually do testing..whats being taught is wrong..in the past we always smiled and went to the lab and tested . Now everyone believes whats on the web..

I saw videos in USA, regulations differ worldwide. But see currently there according to UL they say within 1 meter / feet from the array. SMA on Grid inverters like this. Solar Edge also still inside and lots of arguments... This happen worldwide, technology far ahead of regulations and that also create problems

4 series string to Parallel see 1.31

@@ltvtech ok..

@@davidstevens7809 th-cam.com/video/Ag3zEUqJuAY/w-d-xo.htmlsi=Up_Sx0JoO0UdFDC4 A bit more detailed example

Take pictures of the specs email to johan@ltvtech.co.za

That's great, I'm glad you got to it.

Pleasure indeed, see also the latest one on parallel connection, same principle if you have multiple strings to be installed

I am glad you founded it useful.

Thank you Logan, glad it was helpful. South Africa is advancing quickly in renewable energy with our national grid failures. Chinese companies have so many specialists in DC Products, we used to get products from European countries, but they themselves manufacture there and just OEM their brands. Its my passion to dig deep into solar energy and share my experience and quality products. If you have TikTok follow me there on @johanmoesh I dont put all videos on TH-cam. Will in the future create more on TH-cam

These polarized breakers are confusing and dangerous..

Hi 🇿🇦 Promo towards? 😀