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Synerji 5KVA MPPT PLUS HYBRID INVERTER


Thembeni
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19 hours ago, Thembeni said:

sorry 0.13kW , I was expecting 275x9 = 2475 W.I am new in this field. Thank you

Hi Thembeni,

the power of 275Wp x 9 PV modules  (2475W) is just a possible maximum that in reality is limited by a number of factors. The power (watts) is a function of Volts x Amps, so if you have only a very small load connected to your system(ie: laptop), then you have the Volts but you're drawing just a very little Amps. Therefore, there's not much power generated/consumed. Solar power works like that both these two conditions have to be met at the same time in order to generate the power:

  • the sun has to shine directly on the PV modules
  • you must have a decent load turned-on

If you don't have any load connected, then the only other place where energy can go is the batteries. So, if your batteries are empty, then you will see some power being generated no matter that other loads are off. Actual power will be limited by amount of panels, technical parameters of your solar charger and by the solar insolation, of course. Once your batteries are full, they virtually stop drawing a power.

So, charge your battery, wait for the perfect sun and then turn-on some huge appliance like geyser, air-condition or a stove.

Makes sense?

 

Edited by Youda
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3 hours ago, Youda said:

Hi Thembeni,

the power of 275Wp x 9 PV modules  (2475W) is just a possible maximum that in reality is limited by a number of factors. The power (watts) is a function of Volts x Amps, so if you have only a very small load connected to your system(ie: laptop), then you have the Volts but you're drawing just a very little Amps. Therefore, there's not much power generated/consumed. Solar power works like that both these two conditions have to be met at the same time in order to generate the power:

  • the sun has to shine directly on the PV modules
  • you must have a decent load turned-on

If you don't have any load connected, then the only other place where energy can go is the batteries. So, if your batteries are empty, then you will see some power being generated no matter that other loads are off. Actual power will be limited by amount of panels, technical parameters of your solar charger and by the solar insolation, of course. Once your batteries are full, they virtually stop drawing a power.

So, charge your battery, wait for the perfect sun and then turn-on some huge appliance like geyser, air-condition or a stove.

Makes sense?

 

Thank you, I tried to maximise the load to 1kW  and i got battery alarm and the sun was shining directly to all 9 panels

 

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Here is a trick. Go and count the little squares on your solar panels. There's going to be either 60 or 72 of them per module. It is hard to say, because usually a 250W module will be 60 cells, and a 300W module will be 72, so I don't know where your 275s are, but I suspect 60. Now consider this picture:

Selection_189.png.1380be7b41b580317c1da97e6b74f9f4.png

Note the PV voltage of about 105V. If you have 3 modules of 60 cells in series, that's 180 cells. Divide 105/180 ~= 0.6V. That means the panel is unloaded, it is not doing any work. A panel that is working pulls down to 0.5V per cell, or around 90V in this setup.

If you have 72 cell modules, then the voltage is right, but the current is about a quarter of what it should be, which makes even less sense. That is why I guess you will find that they are 60-cell modules.

Now that is so terrible that you might as well connect the PV panels directly to the battery (not permanently, just as a test) and you will get 10 times more power than you do now. Specifically, it will pull the panels down to 47V (the battery voltage), but it will work at the panels Imp which should be around 8 amps, that's around 380W per string, or over 1kw.

I also note that your batteries are very low. 47V while receiving a low charge is practically empty.

Finally, I'm a little concerned about your PV wiring. You have 3 of them paralleled up, and it looks like normal 25A household wiring. At 8A per string, you're about at the limit of what that wire can handle.

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7 minutes ago, Thembeni said:

cells are 60

Then your MPPT is counting toes as we say in my mother tongue  when someone is wasting time instead of doing work. This could be because it is incorrectly configured (doubtful, as 47V is low enough that even bad settings should charge), damaged, or just plain horrible as @Chris Hobson also found in his review.

My upper-gut feeling is that you should try a different MPPT, but I understand that you may not be close to a shop that sells these, nor are they exactly cheap. Even if you just installed a cheaper PWM controller in there (as a test, a backup, or an interim plan) you should be better off than you are now.

My lower-gut feeling is to toss the inverter and get something better. Like an Axpert. Can't believe I said that... :-P

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