New PV System performance

[moggy1968]

The power one has to be set up correctly by moving a jumper cable inside the inverter, without this the system will not perform at it's peak. I wouldn't have split this into 2 strings unless there was a specific need and would have also used a 3kW inverter, although, as above, the choice is marginal.

 

[kevhky]

The power one has to be set up correctly by moving a jumper cable inside the inverter, without this the system will not perform at it's peak. I wouldn't have split this into 2 strings unless there was a specific need and would have also used a 3kW inverter, although, as above, the choice is marginal.

Hi its not set up as 2 strings only using one string

Whats this jumper setting you mean, surely this should have been done on install

Kev

 

[moggy1968]

yes it should have been. If it hasn't been set up correctly the inverter will try and split the 1 string into 2, as I found on an install last year! I wouldn't normally use this inverter for a single string configuration but it was the only one of the good quality inverters I could get at the time. Once set up properly it was fine.
There are instructions in the instruction book on this but they are poorly translated so not that easy to follow. I seem to rmember you could tell from the display if it was splitting into 2 strings in the inverter.

Having said al that, we just set up a 3.1kW sytem with an SMA 3000HF. We finished around lunchtime weds and it was only outputting around 2.4kW, but it was over 30deg with no wind.

 

[solarsavings]

The power one has to be set up correctly by moving a jumper cable inside the inverter,

The jumpers, red and black (supplied in plastic bag) need to be added and the dip switch set to par.

 

[kevhky]

The jumpers, red and black (supplied in plastic bag) need to be added and the dip switch set to par.

Thanks for that info matey

He left no jumpers but ill have some ilying around

Do these jumpers need to be in any sort of order or is it basically they are on or off

 

[solarsavings]

You really need to speak to the installer. He should have fitted them and set the dip switch, if he hasn't, get him to do so. You will void the inverter warranty if you fit anything other than the aurora jumpers.

 

[kevhky]

You really need to speak to the installer. He should have fitted them and set the dip switch, if he hasn't, get him to do so. You will void the inverter warranty if you fit anything other than the aurora jumpers.

When i get home (currently at work ) ill have a look see if the jumpers have been fitted (maybe they have already) if not ill get in touch with the installer

Just to clarify it is the Aurora uno 3.6 outd uk version we are talking about
And running this only on 1 string i should have red and black jumpers installed and dip switch set to par

Please confirm and ill look tonight

Thanks again

 

[kevhky]

So when i check i should be lookig for my jumpers to be like these in picture

https://www.box.com/shared/1734d9e98cae971e5cca


Kev

 

[wstevew]

FYI my east/west 3.84kWp is peaking at approx 2650w (5 minute averages) on the recent hot days without any clouds. Daily generation in the 21s probably would be a bit higher without late afternoon tree shading.

 

[solarsavings]

So when i check i should be lookig for my jumpers to be like these in picture

https://www.box.com/shared/1734d9e98cae971e5cca


Kev

Yes as your link shows.

 

[kevhky]

Yes as your link shows.

Solarsavings, Moggy1968 - Had the front off and NO jumpers, so popped down me mates who had same inverter fitted but IS using two strings, grabbed his unused jumpers and have now fitted them onto mine

one thing i have noticed since doing it on the screen in no longer shows pin\line 2 as it used to

Cant understand why the installer never done this as like you say its clear enough in the manual


Kev

 

[moggy1968]

glad you got it sorted, well done. adapt and overcome!!

 

[kevhky]

Hopefully we get a bit sun tomorrow so i can see if theres any improvement

Kev

 

[yorkshiremike]

It is quite acceptable to connect only a single string to one input/MPPT (IN1), provided the maximum DC current is less than the rated limit for the input (16-18 amps). If it is greater (for example the 'string' is actually an array of two or more strings paralleled together), then what the patch leads and jumper setting let you do is 'share' across both inputs, so that each handles half the 'string' current, but only one MPPT is active (ie you parallel IN1 and IN2 internally)

If you are only using the one input (IN1), then the recommendation is that the other input (IN2) is shorted with a patch lead internally, but this is to avoid issues with the inverters diagnostics on DC side insulation and shouldn't effect peak generation.

 

[Digon]

My 3.6 Out uk was setup with 2x 8 panel strings wired as a single array into the inveter with the jumpers fitted but the installer didn't set the switch to 'PAR'. For the first month my system was badly down on performance until I figured out the setting was wrong. When I changed to PAR the output instantly doubled as could be seen on the graph on the deskview unit.