Hi

My setup:

Deye 8kw Inverter

Dyness 5.12 batery X 3

Canadian 600W Solar Panels X 12

 

My Problem:

The best yield I get form the panels is 65.3% thus 4.7kw from the 7,2 kw source

 

Any ideas on how I can improve this.

How are the panels wired (how many per string into each MPPT) and what orientation is the roof?

What % SOC are your batteries set to during the day?

Is there any shading (even partial) during the day

What is the configuration of your panels? i.e. all in one string in series or 2 strings X 6S?
What is the installation orientation, i.e. azimuth and tilt of the panels and where are you located as that will have a direct influence on the irradiation.
Have you checked the voltage on the strings with a multimeter to see if it adds up to the theoretical VOC? 

22 minutes ago, mzezman said:

How are the panels wired (how many per string into each MPPT) and what orientation is the roof?

What % SOC are your batteries set to during the day?

Is there any shading (even partial) during the day

All in 1 string

% SOC 40

Shading only early morning - full sun from 8am

 

22 minutes ago, zsde said:

What is the configuration of your panels? i.e. all in one string in series or 2 strings X 6S?
What is the installation orientation, i.e. azimuth and tilt of the panels and where are you located as that will have a direct influence on the irradiation.
Have you checked the voltage on the strings with a multimeter to see if it adds up to the theoretical VOC? 

One string in series

Azimuth : -16     -   location  -26.55437181235141, 28.022343848080556

Did not check - not technical

1 minute ago, The Eagle said:

All in 1 string

% SOC 40

Shading only early morning - full sun from 8am

 

Are you able to share with us your graphs for PV and battery charge? Often we can infer things from them. 

6 minutes ago, mzezman said:

Are you able to share with us your graphs for PV and battery charge? Often we can infer things from them. 

my ignorance - where do i get those?

5 minutes ago, The Eagle said:

One string in series

If the 600MS are your panels, then the VOC X 12 = 495V
From what I see, your inverter is rated for MPPT Range of 125 - 425V
You are well advised to split your array into two 6S strings as I have no idea how far the Inverter is able to contain the overvoltage and I suspect that may be part of the problem.

6 minutes ago, zsde said:

If the 600MS are your panels, then the VOC X 12 = 495V
From what I see, your inverter is rated for MPPT Range of 125 - 425V
You are well advised to split your array into two 6S strings as I have no idea how far the Inverter is able to contain the overvoltage and I suspect that may be part of the problem.

This is absolutely spot on - else your MPPT may get fried. 

 

9 minutes ago, The Eagle said:

my ignorance - where do i get those?

On your app you should be able to see some graphs that show PV and SOC - if you are using Solarman then they would look something like this >

Your data is not consistent with the panel outputs. It shows 20,1A whilst the panels have a rated max of 17,2A
The reported voltage X Amps adds up correctly but the base values seem out of whack and I once again surmise that the Inverter is trying to protect the MPPT from the overvoltage which could cause this perceived anomaly in the values you have. 

 

36 minutes ago, zsde said:

If the 600MS are your panels, then the VOC X 12 = 495V

OK, but based on the indicated...

29 minutes ago, The Eagle said:

I suspect that the panels are, in fact 6S2P, since the 204.4V indicated would imply this, no way would all 12 panels in series only come up to 204.4V, unless they're well shaded and then the 4-odd kW doesn't makes sense, so, @The Eagle, I suggest you confirm your panel wiring configuration first, I think 6S2P is probably what you have and not 12S1P... and double check that it isn't 5S + 7S both in parallel.... which also would be less than great...

... and to add to the less than great, all the panels are on the one MPPT input, this will not work, according to this the PV inputs are rated at 18A and I've seen others say 22A, either way, since the panels are rated at Imp of 17.2A and Isc of 18-odd amp, you will have to run however many panels don't give too high a Voltage on the one MPPT input and the rest on the 2nd one, best is 6S1P on the 1st MPPT and 6S1P on the second MPPT, if you need more capacity, you can enlarge the strings to 10S or to be safe, 9S so you could add very safely another 50% capacity of solar panels by adding 3 more in series with each of the 2 6S strings you should be running, one into each MPPT...

30 minutes ago, Kalahari Meerkat said:

one into each MPPT..

that will be the most efficient way of doing it with the available panels.
I had another look at the the inverter and it does allow up to 500V input voltage but the MPPT is restricted to 425V so one can only guess what the circuitry and firmware does with the "grey" area between 425 and 500.
A 6S string could provide a real voltage of around 270V X 17A could produce a nominal power around 4500W per MPPT. 

Thanks all for the advice.

Will action now

As KM already mentions, it is likely that you have a 6S2P panel setup, but instead on running each string of 6 panels to a different MPPT, they have been run in parallel. Your inverter is not able to handle the current produced in this scenario and is "clipping" the overcurrent.

If indeed your panels are wired this way, it would be a quick fix, whereby the 2 strings are separated and each string feeds a separate MPPT.