String inverter - one array vs multiple arrays (pros vs cons)

[ButchDeal]

I should clarify I know it occurs at the inverter but the output of the pv wasn't exceeding the inverter input. The max ac output was the limiting factor

Clipping means that the array is producing more power than the inverter can convert to AC.


the array input is a warrantly limit in the size of array allowed to be configured, but higher numbers result in clipping....

[arf88]

Yes exactly sure and is exactly what we are talking about.
if you look at your. Dc current with the SE5000h you would see the DC voltage jumping up to allow the inverter to limit its output to 5kW

Makes sense I don't think I can monitor that from the portal unfortunately, unless I connect a meter and instrument the connection which I didn't bother to.

But that makes sense if that is what is happening. You can view those details from the portal?

[ButchDeal]

What a bone head I have 18 panels not 16 and it's the 330w model with P400 optimizers.

Ok so is my assertion correct regarding the clipping.

What has be befuddled is why the first installer setup two strings with 9 panels and this last one one with 18. Based on. What you are saying it does not matter but I had to check with the experts

Ok now that makes more since.
but 18 X 330 = 5.94kW which is more likely to clip in the 5KW inverter.

however now you have a problem. 5.94kW is OVER 5.7kw which is the max string size allowed for the SE6000h. It should be two strings of 9 each for prvent viding your warranty and limiting oroducton in cold days.

[arf88]

I should clarify I know it occurs at the inverter but the output of the pv wasn't exceeding the inverter input. The max ac output was the limiting factor

[ButchDeal]

You sure about that? https://pvpmc.sandia.gov/modeling-st...er-saturation/

I have the P400 I stated that a few times already.

Yes exactly sure and is exactly what we are talking about.
if you look at your. Dc current with the SE5000h you would see the DC voltage jumping up to allow the inverter to limit its output to 5kW

[ButchDeal]

Sorry seems like I'm always one post behind on the phone.

Panasonic HIT and P400 optimizer from SE

Wait, you have panasonic Hit modules? What size?
You said your system is 16 pv modules and 5.6kW which means each pv module is 350w. That is not a common panasonic size.
a 330w one is the most recent. Which would make your system 5.28kW

the p400 is the right optimizer for the panasonics.

seems your installer did something right, with the SE5000h it would have been correct to have two strings.
with the SE6000h (as well as the SE7600h and SE10000h) a single string could be used.

https://www.solaredge.com/sites/defa...tasheet-na.pdf

EDIT: this is before the size changed, two strings of 9 is the only correct option for 18 pv modules of panasonic 330 watt to prevent going over the max wattage limit per string.

[arf88]

Ok that is a tually the deffinition of clipping. An array with an inverter sized such that it clipps the output if the array. Clipping happens at the inverter, you seem to think it is on the DC side of things which is not correct.

also you should find out your optimizer model. It is likely the p400 optimizer,

You sure about that? https://pvpmc.sandia.gov/modeling-st...er-saturation/

I have the P400 I stated that a few times already.

[arf88]

Ok so you have 350w pv modules

which model of solardge optimizers. You can get in install report from solardge monitoring web site to find out.

Also it is not 5.6kW peak but 5.6kW STC ( standard test conditions). It can produce more than 5.6kW, on cold clear windy days.

not knowing the optimizer model, it should make little difference between two strings of 8 or one of 16. Few installers would have done two strings on this setup.
The 5kw inverter would clearly clip some on a 5.6kw array on a single azimuth.

What a bone head I have 18 panels not 16 and it's the 330w model with P400 optimizers.

Ok so is my assertion correct regarding the clipping.

What has be befuddled is why the first installer setup two strings with 9 panels and this last one one with 18. Based on. What you are saying it does not matter but I had to check with the experts

[ButchDeal]

I don't think clipping is the problem, the issue was the max AC output of the 5k inverter being limited to 5kW max. If inverter clipping was the issue it would have never reached the peak AC output. Issue wasn't DC it was the output.

That said the SE Optimizers and 5.9kw pv

Ok that is a tually the deffinition of clipping. An array with an inverter sized such that it clipps the output if the array. Clipping happens at the inverter, you seem to think it is on the DC side of things which is not correct.

also you should find out your optimizer model. It is likely the p400 optimizer,

[arf88]

Sorry seems like I'm always one post behind on the phone.

Panasonic HIT and P400 optimizer from SE

[ButchDeal]

Inverter is 6K model with a max output of 6kW AC. My system generates 5.6 on peak which this inverter handles fine.

Ok so you have 350w pv modules

which model of solardge optimizers. You can get in install report from solardge monitoring web site to find out.

Also it is not 5.6kW peak but 5.6kW STC ( standard test conditions). It can produce more than 5.6kW, on cold clear windy days.

not knowing the optimizer model, it should make little difference between two strings of 8 or one of 16. Few installers would have done two strings on this setup.
The 5kw inverter would clearly clip some on a 5.6kw array on a single azimuth.

[arf88]

Nope the 7.6 has been available all year.
So you had the SE5000h and they swapped it for the SE6000h?
What you are talking about is called inverter clipping.
So what size pv modules do you have?
what model optimizer?

there ar limits to the wattage of any string, as well as min and max number of pv modules/optimizers which varies based on some models of optimizers.

I can show you the datasheet when I get home. The 7.6 was not even listed on the SE website. None the less it doesn't matter at this point the 6k for my system is perfect size.

I don't think clipping is the problem, the issue was the max AC output of the 5k inverter being limited to 5kW max. If inverter clipping was the issue it would have never reached the peak AC output. Issue wasn't DC it was the output.

That said the SE Optimizers and 5.9kw pv

[ButchDeal]

I have SE optimizers of course.

Back to my question does it make a difference in the orientation of the string?

Solaredge inverters only work with solaredge optimizers. They have different models thouh, which model optimizers do you have and which pv modules do you have?

[arf88]

Inverter is 6K model with a max output of 6kW AC. My system generates 5.6 on peak which this inverter handles fine.

[ButchDeal]

You posted while I was composing on the phone. At the time a few months ago the 6000 model was the biggest you can get. I think you misunderstood my question. I'm not saying the size of the inverter has anything to do with the PV output. I simply stated when I was monitoring my system daily I noticed the peak AC output was being hit on the 5K model which I had for a few weeks before it was upgraded. The PV system at any given time, ideally peak was not being reached it was cut off due to the limit of the inverter. With the upgraded inverter this is no longer an issue. I was just curious about the orientation of the string.

Nope the 7.6 has been available all year.
So you had the SE5000h and they swapped it for the SE6000h?
What you are talking about is called inverter clipping.
So what size pv modules do you have?
what model optimizer?

there ar limits to the wattage of any string, as well as min and max number of pv modules/optimizers which varies based on some models of optimizers.