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  1. #901
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    Default Re: Impressed with China Pure Sine Wave Inverter

    Good news guys, things are rolling again.

    Got my import taxes sms from Buffalo this morning so those of you that also await parcels, look out.

    But it looks like their bank account number changed?

    I had it as
    6273 5274 277

    Now it is 6284 4846 652

    Anyone experienced this also?
    Last edited by Die SwartKat; 2020/05/22 at 08:22 AM.
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  2. #902
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    Default Re: Impressed with China Pure Sine Wave Inverter

    Quote Originally Posted by Die SwartKat View Post
    Good news guys, things are rolling again.

    Got my import taxes sms from Buffalo this morning so those of you that also await parcels, look out.

    But it looks like their bank account number changed?

    I had it as
    6273 5274 277

    Now it is 6284 4846 652

    Anyone experienced this also?
    Heeeey I just got mine as well this morning!
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  3. #903
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    Default Re: Impressed with China Pure Sine Wave Inverter

    I send them a whatsapp and an email.

    Want to make sure about the bank account before I make payment.
    Nico Swart

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  4. #904
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    Default Re: Impressed with China Pure Sine Wave Inverter

    No response yet, but I see now they did advise of a change in banking details on the sms.

    So making the payment now and hoping all is good.
    Nico Swart

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  5. #905
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    Default Re: Impressed with China Pure Sine Wave Inverter

    Quote Originally Posted by Die SwartKat View Post
    No response yet, but I see now they did advise of a change in banking details on the sms.

    So making the payment now and hoping all is good.
    Just got my payment confirmation from them.

    Holding thumbs we get it soon!

    Now I need a charger!!
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  6. #906
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    Default Re: Impressed with China Pure Sine Wave Inverter

    Quote Originally Posted by Buffy_ZA View Post
    Just got my payment confirmation from them.

    Holding thumbs we get it soon!

    Now I need a charger!!
    Still waiting for mine. Suppose your payment was done before mine, around 11h20
    Nico Swart

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  7. #907
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    Default Re: Impressed with China Pure Sine Wave Inverter

    My inverters that were in SA on 23 Mar got delivered today.

    Can check them this weekend.

  8. #908
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    Default Re: Impressed with China Pure Sine Wave Inverter

    Quote Originally Posted by ekkekan View Post
    My inverters that were in SA on 23 Mar got delivered today.

    Can check them this weekend.
    Lekkerrrrrrrrrrr man.
    Nico Swart

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  9. #909
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    Default Re: Impressed with China Pure Sine Wave Inverter

    It arrived!! Now to get a charger!!
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  10. #910
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    Default Re: Impressed with China Pure Sine Wave Inverter

    At what rate of exchange did you guys pay for these inverters?
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  11. #911
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    Default Re: Impressed with China Pure Sine Wave Inverter

    Quote Originally Posted by Shade View Post
    At what rate of exchange did you guys pay for these inverters?
    Current price is very high. I bought some in March at about R17.80/$ but one always pay more due to comms via PayPal.

    Easier to compare the actual price.
    Last edited by ekkekan; 2020/05/27 at 03:14 PM.

  12. #912
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    Default Re: Impressed with China Pure Sine Wave Inverter

    Mine also arrived, and also with that same seperate plug - can use 2 prongs on it at the moment, but not a 3 prong. Resoved to ordering a travel pluag from Takealot!


    Quote Originally Posted by Buffy_ZA View Post
    It arrived!! Now to get a charger!!
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  13. #913
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    Default Re: Impressed with China Pure Sine Wave Inverter

    And so mine has also arrived this morning!

    Ekkekan, after my next post I'll be ready for you.
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  14. #914
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    Default Re: Impressed with China Pure Sine Wave Inverter

    Need a little help again please guys.

    It seems the more I read about controller sizing and PV arrays being in series or parallel, the more questions pops up, and I have done a lot of reading and still not sure about one final (maybe crucial) aspect.

    Trying to figure out best way to reinstall my current setup.

    I have:


    • The 150 | 35 Victron MPPT
    • 5 x 22Volt solar panels. (3 x 135 Watt) and (2 x 130 Watt)
    • 24V Changi inverter
    • 24V battery bank


    So the MPPT will work with a panel voltage of 110V and 665 Watt in total if I go for a series connection. 135 + 135 + 135 + 130 +130

    Or is that rather 130W x 5 panels? Using the 2 lowest panel values? Meaning 650 Watt?

    So 650/24Volts = 27amps the controller need to handle, and factoring in a 25% safety margin for optimal conditions in cold but sunny weather brings me to 33.7 amps. MPPT should be good.

    If all is connected in parallel, then Iím looking at 6.1 amps closed circuit voltage for the 135Watt panels, and 5.9 for the 130Watt panels which is also within spec for the controller. (30.1 amps)

    I understand the issues with shading when it comes to a series connection, and I understand the danger with high voltages.

    Where my panels are mounted, I will have good shade free sunlight on them from about 09h00 to 13h00.

    The way Iím going to use the system, these 4 hours should be more than enough to recharge my batteries. In fact, they should not even get depleted.

    The distance of all cabling between solar panels and to the MPPT will be no more than 20 meters.
    I will source the appropriate size wire.

    Iím not worried about getting the batteries fully charged everyday.

    I just want my setup to perform/charge at the best rate it possibly can in the amount of available sunlight hours it has.


    So here is my question.

    Do I:


    • wire all 5 panels in series to obtain 110 Volt; or



    • wire the panels in a combined series // parallel connection to get closer to 24 Volt on the array side? 2 series wired panels in parallel with another 2 series wired panels gives me 44Volts open circuit? (I understand that this will make the wiring slightly more tricky because of the 5th panel)


    This is the only issue I cannot find an answer to on every single website I've read.

    What setup will give the MPPT the best circumstances to work with?

    Does an as high as possible voltage provide the controller with more room to work its magic in determining the power point on the IV curve?

    Or is the only advantage obtained from higher volts the fact that one can now use thin wires without the voltage drop? And that 44Volts is in other words high enough?

    Please correct any blunders Iíve made in my reasoning and calculations above.
    Nico Swart

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  15. #915
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    Default Re: Impressed with China Pure Sine Wave Inverter

    Quote Originally Posted by Die SwartKat View Post

    I have:


    • The 150 | 35 Victron MPPT
    • 5 x 22Volt solar panels. (3 x 135 Watt) and (2 x 130 Watt)
    • 24V Changi inverter
    • 24V battery bank


    So the MPPT will work with a panel voltage of 110V and 665 Watt in total if I go for a series connection. 135 + 135 + 135 + 130 +130

    Or is that rather 130W x 5 panels? Using the 2 lowest panel values? Meaning 650 Watt?

    So 650/24Volts = 27amps the controller need to handle, and factoring in a 25% safety margin for optimal conditions in cold but sunny weather brings me to 33.7 amps. MPPT should be good.



    The distance of all cabling between solar panels and to the MPPT will be no more than 20 meters.


    • wire the panels in a combined series // parallel connection to get closer to 24 Volt on the array side? 2 series wired panels in parallel with another 2 series wired panels gives me 44Volts open circuit? (I understand that this will make the wiring slightly more tricky because of the 5th panel)

    Nico I can only talk of my very own recorded figures on my panels in series. The specs indicate a open circuit volts of 118V and in over a year my panels have never gone over 108V.

    Based on this I don't think you need to factor a voltage higher than the open circuit voltage. You are 25V away from the max of the controller when you have a 110V max as per specs.

    Due to your distance of 20m I would rather run 6 amps with the 5 panels in series. Yes I might be a lone wolf but very few comments about shading are factoring in the by-pass diodes when one panel is in shade or partial shade. I have recently tested my by-pass diodes by shading about half of each panel and my output under the shaded panel for each panel did not drop more than 25% of the un-shaded power value.

    As you have researched this topic you can see with different current and cable sizes what the voltage drop would be if you go the || route. Satisfy yourself by using a calculator and see why I would rather use the series route and as you say you can limit the problem around shading.

    Further I would say on average you can expect to get 600x4hrs=2400W from your panels per day and you can use this figure to work out if you are going to use more than that. This is taken in full sun. Some overcast days in summer you might get far less than this 2400W. It still remains the best to have a battery monitor to disconnect should you use too much from your batteries in the evening following some heavy cloud.

    Right now I am getting more PV for April/May than I got from any of the summer months from Dec up to March. We had a lot of cloud this past year on summer days.

    My own panels never give me a peak of over 650W apart from as the sun comes out of some clouds and I get an average of 3.42kWh per day.

    Trying to use all 5 panels with 2 in series and then in || the other in series will not be a a good move. Using only 4 will give far less power than 5 in series.

    Just my 2c on this choice you are faced with.
    Last edited by ekkekan; 2020/05/28 at 07:00 PM.

  16. #916
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    Default Re: Impressed with China Pure Sine Wave Inverter

    Quote Originally Posted by Die SwartKat View Post

    • The 150 | 35 Victron MPPT
    • 5 x 22Volt solar panels. (3 x 135 Watt) and (2 x 130 Watt)
    • 24V Changi inverter
    • 24V battery bank


    So the MPPT will work with a panel voltage of 110V and 665 Watt in total if I go for a series connection. 135 + 135 + 135 + 130 +130

    Or is that rather 130W x 5 panels? Using the 2 lowest panel values? Meaning 650 Watt?

    So 650/24Volts = 27amps the controller need to handle, and factoring in a 25% safety margin for optimal conditions in cold but sunny weather brings me to 33.7 amps. MPPT should be good.
    Max volts on the MPPT is 150v, so you are well within that at 110v.
    Max. PV short circuit current is 40A, again your are good ito your calc of max 33.7amps.

    135 + 135 + 135 + 130 +130 = 650 i.e. the 135 x 3 panels will derate to 130w i.e. the lowest wattage panels.
    On 24v it is advised to not exceed 1000W - so that is also well within limits.

    20m distance, me, I would use 6mm2 cable from panels to MPPT.
    4mm2 is also fine.
    Last edited by the_terrible_triplett; 2020/05/28 at 07:48 PM.
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  17. #917
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    Default Re: Impressed with China Pure Sine Wave Inverter

    Thanks TTT and Ekkekan.

    You both seem to be an agreement that I should go for a straight series connection of all 5 panels.

    The higher the volts, the more room the controller have to maneuvre in? This is really the only part that I struggle to get my head around.

    Is there a threshold of sorts, which if exceeded no longer yields any further charging advantage?



    I have read about the bypass diodes and what they do when it comes to shading. It seems however that this is a difficult thing to determine as when exactlty the diodes start conducting.

    It appears that with hard shading as Ekkekan have done by partially covering the panels from sun they will conduct, but with soft shading, (clouds moving in front of the sun) the diodes does nothing.


    Ekkekan, why do you say it would not be a good move to parallel / series wire the 5 panels? Only because of the extra wiring, or is there another reason?
    Nico Swart

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  18. #918
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    Default Re: Impressed with China Pure Sine Wave Inverter

    Nico the panel is made up of I think 3 sections. If a section is shaded then the voltage from the other panels will forward bais the diodes and they pass the current from the other panels.

    When using MPPT controller the controller is constantly loading the panels to reach the max power point as far as current and voltage is concerned. The voltage drops as more current is passed through. If you have different configurations like 2 in series and 3 in series in the 2nd group the controller cannot determine what loading to place to reach the max point. If I am wrong on this I would like to be corrected. This is how I understand it but it is one test I have not done.

    Don't sweat to much on how to connect. Try the one method and measure your results and after a few weeks you can try the other way of connection. Just ensure you start of with wiring from the panels to controller to handle 5 panels in //.

    You have a great controller with all the recordings to know what works best.

    Bear in mind as TTT indicated in series you will get the current of the lowest panel through the few panels that can supply more. Thus it is only about a 5W loss.

    The controller does not have to maneuvre anything as long as you stick to below the max panel volts. It will control the amps and volts for max power.
    Last edited by ekkekan; 2020/05/29 at 02:52 PM.

  19. #919
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    Default Re: Impressed with China Pure Sine Wave Inverter

    Quote Originally Posted by DeonStr View Post
    Mine also arrived, and also with that same seperate plug - can use 2 prongs on it at the moment, but not a 3 prong. Resoved to ordering a travel pluag from Takealot!
    I replaced that crappy plug with this:
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  20. #920
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    Default Re: Impressed with China Pure Sine Wave Inverter

    Quote Originally Posted by BruceHun View Post
    I replaced that crappy plug with this:
    Where did you get that plug?
    Looks like something I need to do

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