Panels for 5 Kw Sunsynk

Die Uwe

Die Uwe

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Hi all

So I bought a 5kw Sunsynk, 2 x 5.5kw Hubbles and 12 x 460w JA panels from Steve.

Asking the local solar installer to come and install it he asked me why so many panels, the inverter cant handle that.

Have I not been doing the calculations correctly?

Please help

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The installer has probably forgotten that 5kW sunsynk has 2x mppts.

You should be fine with 2 strings of 6 panels each.
 
The only thing I see is that the max mppt current is 11A but you panels can produce more than 11A, don't know how the inverter will handle that as its not a big margin.

Coming back to the installer, I would drop him like a hot cake, the inverter is clearly rated for more power and your panels are lower than that.
 
Kawak said:
Maybe it's not all 12 in series? Just break it up into a parallel of 2x6, or use your dual mppt.
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That is what I thought. 2 strings of 6, each string to its own mppt.

But why would an installer not know that?
 
Die Uwe said:
That is what I thought. 2 strings of 6, each string to its own mppt.

But why would an installer not know that?
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Guestimate or at least what would be going through my mind should something similar happen to me: Newish installer or just did installation with a standard type setup, hence, does not know other brands/setups.
 
I should have added, im in a small karoo town. This is the only installer I know of in a 200km radius.
 
TheChamp said:
Was he recommended?
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I asked Steve now to recommend someone. This is the only guy in a 200km radius that I know of and I like to support local, but not at the cost of someone mucking up my solar installation.
 
TheChamp said:
The only thing I see is that the max mppt current is 11A but you panels can produce more than 11A, don't know how the inverter will handle that as its not a big margin.

Coming back to the installer, I would drop him like a hot cake, the inverter is clearly rated for more power and your panels are lower than that.
Click to expand...
Current the inverter will derate. Its the Voc you don't want to exceed.
 
TheChamp said:
The only thing I see is that the max mppt current is 11A but you panels can produce more than 11A, don't know how the inverter will handle that as its not a big margin.

Coming back to the installer, I would drop him like a hot cake, the inverter is clearly rated for more power and your panels are lower than that.
Click to expand...
The MPPT was upgraded to 13A in a firmware update last year sometime
 
Die Uwe said:
That is what I thought. 2 strings of 6, each string to its own mppt.

But why would an installer not know that?
Click to expand...
There are still installers that only ever worked on axpert type inverters and are flabbergasted by what a true hybrid inverter can do.

Ask him if he's ever installed a sunsynk inverter or any other true hybrid inverter. And what his largest installation was.
 
TheChamp said:
The only thing I see is that the max mppt current is 11A but you panels can produce more than 11A, don't know how the inverter will handle that as its not a big margin.

Coming back to the installer, I would drop him like a hot cake, the inverter is clearly rated for more power and your panels are lower than that.
Click to expand...
A short circuit current isn't what the inverter will see, max current is 10.92, it's highly unlikely to see that as it's under ideal conditions.
 
TheChamp said:
Your comment on the current? Because from what I have gathered through reading the mppt should be rated for Isc plus 20%, how is the mppt going to cope with the extra current when it happens?

Okay, never mind, I see my question was answered while I was typing.
Click to expand...
The MPPT clips the incoming current automatically. How it does this I have no idea.

It cannot do the same for voltage.
 
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