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@lowtech_1 11 күн бұрын
It's very confusing, I have to imagine the load is a battery, and work/wire from there. Otherwise it does my head in 😮 Thanks for video.
@ltvtech 9 күн бұрын
@@lowtech_1 it certainly is, therefore just stay away completely from polarity breakers and get to Non-Polarity breakers. Source is the power towards the Load. Source would mostly be PV Panels, load would be MPPT towards battery or inverter convert DC to AC(load). Another reason why DC Breakers aren't commonly uses from battery to the inverter and that Fuses is still in use. Because the batteries would be the source towards the inverter(load). Non Polarity breakers are used by battery manufacturers, as it certainly has benifits compared to fuses. Thermal protection, overload protection and short circuit protection.
@ltvtech 14 күн бұрын
Thank you for the good question 😊
@Iqbal_khan-9 14 күн бұрын
great work, keep it on
@sammyjoe2390 18 күн бұрын
Google search for "discussion paper on correct wiring of double pole dc breakers" provides a link to the white paper. On my search this led to a paper from "Energy Talk" which matches the video. It's definitely worth a read. In summary: 1. PV + goes to the label marked "+". The inverter/charge controller + simply follows the PV + regardless of mark or no mark. 2. If you want the PV + to go to the unmarked side then attach PV+ to the unmarked NEGATIVE side. Again, the inverter + simple follows the PV +, even if it puts the inverter + on the breaker marked "-". This makes sense as the breaker labels are trying to show the CURRENT path rather than the specific polarity. I think the current paths in the pictures are all correct relative to the breaker, but if the PV connection is trying to drive the current in the OPPOSITE direction of the intended CURRENT FLOW, then you get problems. This makes sense as the generated magnetic field is a result of the current flow, not the applied voltage. In fact, if there is no current flow (load), then the breaker will likely never show a problem.
@anthonyrcontino312 24 күн бұрын
Hi, can the same be done with 10 panels? 100 w each, op volts 16.77, oc 6.26a, voc19.82v, shortcc 6.56a
@ltvtech 21 күн бұрын
All depends of what hybrid inverter or charge controller are capable with. But yes parallel and series combination to get to required values
@Iqbal_khan-9 28 күн бұрын
great video, i saw lots of videos on this topic on youtube but many of them were non technical persons and could not satisfy me, your video gave me 100% understanding, if possible please mention how to identify polarized and non polarized dc breaker physically
@ltvtech 26 күн бұрын
@@Iqbal_khan-9 awesome and glad it helped.
@ltvtech 15 күн бұрын
@@Iqbal_khan-9 it would be best be shown on the diagram. Flow in one direction are Polarised breakers, also has magnet in, use small washer to feel if there is a magnet pulls or push. Normally Non-Polarity breakers will mention it clearly on it and show + / - on each pole
@ltvtech 15 күн бұрын
@@Iqbal_khan-9 kzbin.info/www/bejne/h3vJZ3ibYruDbJIsi=RE4Kqsmfj5NgMUOV
@Iqbal_khan-9 14 күн бұрын
@@ltvtech tnx bro
@FayzanKhan-h9h Ай бұрын
Could you please tell whether this breaker can be used between battery and solar MPPT inverter? DIHOOL DZ47Z-120 120A 1000VDC
@ltvtech 29 күн бұрын
@@FayzanKhan-h9h sorry most definitely it can yes
@ltvtech 29 күн бұрын
@@FayzanKhan-h9h to go to 1000v you'll have to go to 4 Poles
@ltvtech 29 күн бұрын
@@FayzanKhan-h9h 2P 550VDC 3P 750VDC 4P 1000VDC
@FayzanKhan-h9h Ай бұрын
What about those solar charger/inverters which provide current to the battery while charging and take out the current when load runs
@ltvtech Ай бұрын
@@FayzanKhan-h9h non Polarity breakers has to be used on them.
@thanhka2122 Ай бұрын
Cho tôi hỏi MCB này tải liên tục với dòng 80A có bị nóng không? Thanks!!!!
@timdougall5415 Ай бұрын
So I have seven panels just like in your diagram. If I am left with 250 volts and 10 amps presumably that is DC output. Is there an inverter and battery that can take this? I have looked into putting three panels in series and then putting a string of three others in parallel but this would leave the seventh panel not used. Thanks in advance for any advice
@ltvtech Ай бұрын
@@timdougall5415 how where are you based? Most Hybrid Inverters with MPPT can take this and more.
@timdougall5415 Ай бұрын
@@ltvtech hi I’m in uk actually, yours was the only video I found with seven panels. I bought seven as it is the perfect length for my carport. Thank you for your reply
@ltvtech Ай бұрын
@@timdougall5415 in the UK, Grid-tied inverters are very popular. If you go Grid-tied SolarEdge and SMA are popular. If you going Hybrid, Sunsynk witch are UK based is also good. I personally like Transformer based (Low Frequency) inverters like Victron from Netherlands. Hope it helps.
@timdougall5415 Ай бұрын
@@ltvtech thank you for your advice I will research all of those. With kind regards Tim
@timdougall5415 Ай бұрын
Oh thanks for that brilliant info that’s really helped me
@ltvtech Ай бұрын
@@timdougall5415 Glad it did.
@ltvtech 2 ай бұрын
ltvtech.co.za/pv-evacuplan/
@khanbhai-em3yr 3 ай бұрын
Great video.i have connected two strings in parallel each string has 5 panels and each panel has aroung 575 watt,48vdc and 14.8 amps.the panels i am using are bifacial.each string gives out around 14 amps and if i connect these in parallel it will give out around 28 amps.what rated mcb should i use to connect all these 4 wires i for parallel connection?plz help.thx
@ltvtech 3 ай бұрын
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.
@ltvtech 3 ай бұрын
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
@KyaloSengani-ou2hl 3 ай бұрын
Good explanation
@ltvtech 3 ай бұрын
Thank you, appreciate
@Time-Trvlr 4 ай бұрын
your greeting image is misleading as it is series connection.
@ltvtech 4 ай бұрын
Thank you I see what you mean, I did edit it, not sure when it will reflect
@wisdomagbeli8077 4 ай бұрын
Thanks for this video
@ltvtech 4 ай бұрын
Great pleasure
@elistyle82 4 ай бұрын
I have a load 240V DC ( 20 Amp ), can I use it directly connected to the panels?
@ltvtech 4 ай бұрын
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
@richardtlemmer8712 5 ай бұрын
Remember,you are your own first responder
@richardtlemmer8712 5 ай бұрын
Very important discussion
@odoohub5010 5 ай бұрын
Are all mccb's non polarized?
@ltvtech 5 ай бұрын
All, don't think so, but make sure from manufacturers, don't trust distributors. Most don't even know the difference
@odoohub5010 5 ай бұрын
Why do polarized breakers even exist? Is there any advantage of a polarized breaker over a non polarized breaker?
@ltvtech 5 ай бұрын
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,
@odoohub5010 5 ай бұрын
What about those breakers with indications as "line" on the top and "load" on the bottom. Are they also polarized breakers?
@ltvtech 5 ай бұрын
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
@davidstevens7809 5 ай бұрын
The biggest weakness in any system is the path between the panels and the storage ..controller..the shorter the runs the better it is..power should be immediately to inverter..after its ac then length of wire is negligible.
@ltvtech 5 ай бұрын
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....
@davidstevens7809 5 ай бұрын
@@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..
@ltvtech 5 ай бұрын
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
@davidstevens7809 5 ай бұрын
Thats series.not parallel..
@ltvtech 5 ай бұрын
4 series string to Parallel see 1.31
@davidstevens7809 5 ай бұрын
@@ltvtech ok..
@ltvtech 5 ай бұрын
@@davidstevens7809 kzbin.info/www/bejne/d5iWq3iLpq-od7ssi=Up_Sx0JoO0UdFDC4 A bit more detailed example
@miletrendov423 5 ай бұрын
J need for myst inverter 5,2kw 48v Mppt pro1800 1:46 Main board
@ltvtech 5 ай бұрын
Take pictures of the specs email to [email protected]
@andymueller82 6 ай бұрын
Exactly what I needed! Thank you!
@ltvtech 6 ай бұрын
That's great, I'm glad you got to it.
@Javaman92 7 ай бұрын
Thank you! I think this will come in handy soon.
@ltvtech 7 ай бұрын
Pleasure indeed, see also the latest one on parallel connection, same principle if you have multiple strings to be installed
@Engineerizo 7 ай бұрын
Thank you plz this is the explanation I've been looking for
@ltvtech 7 ай бұрын
I am glad you founded it useful.
@PvMLad 7 ай бұрын
When it says + or - then that indicates the supply side not the load side. Thats why it's switched from top to bottom as you can feed the supply down the top or up the bottom as long as the supply side polarity matches the diagram shown. Safer solution is to get a 4 chamber/module 2 pole dc isolater (often called a 4 pole isolator) that way you can have the supply side on top or bottom as each pole loops through the breaker twice for fault isolation in either direction. If the fault is on supply side then one of the chambers will extinguish the ark, if the fault is on the load side then the other chamber will extinguish the ark. And the circuit will be broken on both positive and negative.
@loganv0410 11 ай бұрын
I went to your site for this paper and found much more great info Thanks much Logan, Tennessee, USA
@ltvtech 11 ай бұрын
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 KZbin. Will in the future create more on KZbin
@waterlec8718 6 ай бұрын
These polarized breakers are confusing and dangerous..
@sawtarring2108 Жыл бұрын
🤭 Promo_SM
@ltvtech Жыл бұрын
Hi 🇿🇦 Promo towards? 😀