DDD

Nonsense!

Eenvoudig aanvaar die uitdaging. Jy kan 'n MPPT verkoop en 'n braai, buffet of Sushi gratis kry.

Ek stem 100% saam hier met jou. Waar dit die verskil maak as ek solar instaleer om te begin is my produk R 8000 goed koper. Ek het nie 'n sertifikaat nodig van spesiale persone wat met 300V en meer werk. dit spaar al klaar Dus kan ek nou mense instaleer en dit die moeite werd maak. Om R8000 op te dok vir iets is baie. Ek wou ook regtig verstaan wat so wonderlik is van MPPT en al wat ek kon kry is kabel dikte. Nou kan ek met sekerheid aan my kliente sê daardie stukkie toerusting is nie nodig nie. Jy klop nie sommer 'n solar instelasie as jou prys klaar R8000 meer is nie. Vir my die belangrikste punt is dit maak solar meer bekostigbaar. Ek dink my grootste rede vir die verstaan was dat baie keer twyfel ek in my eie ontwerpe en sienings da wil ek verstaan hoekom ek nie normaal dink nie. Nou is my twyfel uit geskakel

O dear me. I am not ducking anything. I am prepared to pay your cost even if you loose.I am not prepared to sit with a blue box costing a lot and saving on cable. Maybe my English not so good. But I can assure you no MPPT can increase my harvesting. NOT REFERRING TO TRACKING. Looks like I won already. What need I say more. Throw the towel in even at the gain of a meal, braai buffet? Like they say talk is cheap money buys the wiskey. I rest my case.

Because the MPPT can't deliver? Then I rest my case. All I am saying I will pay all the cost of anyone that can increase my current by 10% or more with the existing array as claimed. Cover all the expenses and stick the person for a buffet,sushi or braai ... and do not expect any money back. If they can't then I will even pay fuel if they loose. So all expenses are paid. Let see who wants to take the challenge. Put your money where your mouth is. You want to fly down from Jhbrg I pay the airfare if I loose.

That is correct. The charging side if you wish is the PV side. If it is a designed to minimize the loss between the PV and batteries. In my case I have 0 loss niks null. Therefore what the PV supplies is 100% fed into the batteries.... I did not test it on voltage higher that 75V as the panels I have tested it on in open cct goes to 73 - 75 V depending on the iradiant W available. Currently I make use of a distributed system and the power unit is mounted on top of the roof with an earth and pos cable going down and a 1mm control cable. Simply done to minimize cabling down from the solar tracker. It can also be mounted close by the batteries. The cable from the controller to the remote unit is a 1 mm wire. The current unit can handle 32 panels @ 260 watts each. I did not bother to do the maths on higher voltage / panels. The reason is simple I make use of a MOSFET of +/- 80 amps and I have 4 of them. The reason I grouped it as such is that 24 panels fits onto my solar tracker. If I assemble 2 panels in one box I can double up and ...... The cost of a basic unit as a charger is R 1800. If I get the charging curves from the batteries I can adopt the algorithm with parameters to maximize the the charging. With that I can control 24 solar panels to maximize charge.

I will answer a little later busy with some testing

From this comment I will get at least 10% more current from my existing PV panels by adding a MPPT. Let me reverse the challenge. I will buy the mppt if it gives me a double digit increase in power harvested from my current Panels. The only advantage I saw thus far from an MPPT is thinner cabling. Let me accept the challenge Ttree . If any one wants to prove me wrong I bet there is quite a few if not you ow me a braai. I know they are wrong and I am right. Simple. So if they increase my current with 10% as claimed using an MPPT. Then I will buy the MPPT, Pay the current costs at market rate. Therefore you can sell me an MPPT charge installation fee, R8 per Km travel. If YOU FAIL I even take for a Buffet and I will pay your fuel to my house. Lets say from Bellville is is R 200. If you cannot increase my current I will take you for a nice Sushi buffet @ Sake in any case. But you will tell this forum you are WRONG and I am RIGHT or Visa versa. Remember the challenge is to increase my existing harvesting current by at least 10%. I am up for the challenge. Ttree after they fail then I will help you installing a tracker. You simply buy the material. Manufacturing will be free. Assist you with every thing ... If they win I will supply you all the bearings ... Free. Manufacture the frame for you free ... Supply the controller free. If they can not increase my power by 10% then I have the right to ICE bucket you and I will stick you for a SUSHI. But rest assure I will put the ICE bucket on you tube. I recon this is a loose loose situation for me but I will have the opportunity to prove that electronics works.

The system is designed with a lower voltage. at 40 - 90V the efficiency of my system is 100%. I did not see the need to go higher in voltage. I can not et more from the solar panels than 100%.

Let me check if I get mosfet replacement for the ones I am currently using They are not specked that high if my memory is still ok. Do you have the charge curve for the batteries?

Jaco what PV voltage & current?

Jaco I been developing electronics for a few years and this is what I have against MPPT. The solar panels get jacked up to high V to charge a battery that is low voltage 48V. For get the other fancy stuff that is stuff I use to make sure my system is properly designed and working well. Some of the software code I have was when I developed 3 phase power meters. Other prepaid meters and then battery chargers...... The only fancy thing to add is the power stage driver. I took that knowledge build it into the system. When I saw the cost the rest it confused me. Not a problem to give you one. My main concern is/was my cost and then what is the logic behind the extra stuff. That heat sink you saw with the red bolt is my prototype for the solar controller. .

Jaco you have 1 system try to manage 60 with 16 panels the smallest one where you get paid for electricity. The reality is that there are so many that want to have solar but to expensive. I am there to help them. If people love MPPT so be it. For 8 K I can sell 6 panels to a person for the cost of the MPPT. My latest cost was R1300 for 250W panel. I had a look at the majority of system spend a lot time an I will challenge anybody to beat my solar harvesting. Let me explain I have 6 235 W and 2 250 W panels You have +/- 24 panels. Therefore you should harvest 57 Kwh per day. I harvest more than 16Kwh per day. What I call a perfect solar day. If I had your 24 panels I would have harvested at least 52Kwh for the day. Would love to know what your total harvesting per day is. You mind telling me?

Actually the system drivers are designed to work at 1000V. Open your device and measure the internal voltage. My 1000 VDZ runs at 100 - 150Khz PWM to follow the grid and that is into the final stages. a separate cage in the box called the HT side of the inverter. Not external.

I did not try to sell it on this forum. I simply tried to understand the expenses. I now have a full understanding and the knowledge I will always have a better price due to the lack of hardware and other stuff. Please I am not trying to sell my stuff. I am not marketing it. I could not understand the costs and all the stuff needed. But now I understand. So many thanks for all the information. If I can take 10 people of the grid with my system then I tackled the right monstrosity. I only had to understand why others cannot afford solar. 7K for MPPT = 6 250W panels new with 20 year... That is where this is beating the other stuff hands down. I though I had it wrong but I understand. 6 Panles = a $ into the grid and then I can afford two breads or a little jam.

You need volts to breakdown your skin resistance. Depending how thick skinned you are the higher the voltage. But from 90VDC it gets a little rough. In my case I am ok and can handle 140V. To input the parameters I think it is called a computer

Will not sell lit to you. . I do not work above 90VDC it is simply to dangerous .. But I am sure if I look at your system and reconfigure it I will harvest more energy and . It all depends on the inverters input span. And then you can sell your MPPT

So sorry!!! Spelling not my cup a tea

Nope I measure a string. Next to it you have another 7 strings that should be equal

I have approached SABS & NERSA. It will be full SABS .... approved. As soon as I can that process will start. That is my next step. The unit can be onboard expanded to 10Kwat single phase or 10Kwatt 3 phase. Nope I do not have brochures. I can not keep ahead at this moment in time. If I get my PCB and they are properly done then I can order plenty PCB and get going. I had 2 set manufactured and will see the impact of it and how to package it. But the box is made to handle the full 10Kwatt unit. Currently the final stage is running @ 600V and only provide an efficiency of 97.8%. The final unit will run @1000VDC then at 10Kw 3 phase I will have an efficiency of >99% and at 10% it falls to 92%. Once I have the box done properly then I will jack up the buck converter to 1000VDC. Comms currently I dump via flash & 485. If I want I can put a small stack on it and then have wifi but the cpu's in under strain then. The manufacturer is busy releasing a quad core cpu with quad math processor. Then I can use one CPU for coms only then it will be a small wifi stack unit. I have been concentrating on other stuff rather than comms. Right now we are looking at 1 year guarantee and we will have a 10 year guarantee if we install the unit. But i has now LCD only 220V line 48V DC 2 comms ports. The beauty is one can start with 2 x 250W panels maybe 260 anything greater than that is a waste. It will also start a genny with no power and you can control 8 devices digital lines for on and off. I do not have the years experience and neither the other requirements but I believe I have a game changers. I have been told with a bigger order of PCB the cost will drop a bit There you have it in a nut shell.

I sold the "charger" on its own for R 1800. That controls 8 strings. The beauty of it is it can control many more panels. 2 Kwatt grid tie inverter which is one phase of 10Kw R4800. It costs my client +/- R 9000 as a combination. It is designed like lego . Koop noga blokkie ...

If you have many systems running I can calculate the drop in power of the panels. Then I know which one must be replaced. We know before the client knows there is a lost in harvesting. The sentence is wrong. The MBB calculates the state of the batteries and sets a flag if it is not ok it sets a flag.

This graph runs in Java. I can drill down int 1 second values my cycle time is @ .0001 seconds. It is real time single or 3 phase. I do not have all the variables on this. Here are some of the internal variables. Batt V,Min Batt V,Mx Batt V,Pw,Solar %,Solar IC, Solar DtC,Solar TC,Gen I,Gen I DT,Gen I T, P1 220V,P2 220V,P3 220V,P_1 I, P_1 C, P_1 CDT, P_1 CT,P_2 I, P_2 C, P_2 CDt, P_2 CT,P_3 I, P_3 C, P_3 CDt, P_3 CT,UseCur,UseCrDt, UseCurT,Z1,Z2,Z3,Z4,Z5,Z6,East M,West M,Top,Bot,Kwatt I,KwattD,KwattT,BattT Curr,Batt %,P Ti On,Batt ChLev,EastWest D,UpDown D,EastWest,VDirGI,MoveI,UpDown,HoriDirGI,Mini C,Ph1_220RmsV, Ph2_220RmsV, Ph3_220RmsV,SolarInstCurrRms, SolarCurrRmsDayTotal, SolarCurrRmsTotal,BattRms,BattRms,BattRms,ElecOnT,PwmC Regards

Look there is a lot more I can write about the controller. To be fair it is part of the inverter. It is a synchronize system that manages a few of my systems where I install them. I do monitor it for my clients and when they have errors then I have all the data and easy to resolve the problems. They are smiling because it is cost effective and working very well. It is designed to be cost effective easy installation and my clients smile all the way