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sergeykoren

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Posts: 7
Reply with quote  #11 
Quote:
Originally Posted by stmbtwle
It's YOUR installation, get a larger inverter if you like. I can understand the smaller inverter, but you could also be limiting your output. The trick is finding the sweet spot. What do other installers/designers in your area use for a ratio?

In my area installers use 1.2-1.3  ratio. i've got 1.52 and my monitoring page looks like straight line on 5kwh for more than half of the day even during the winter time. Also i spoke with SolarEdge(company who make inerters), they mentioned to me that with my conditions inverter is massively undersized and their recommendations is to replace 5kwh inverter with 7.6kwh inverter

stmbtwle

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Reply with quote  #12 
If you have records you can graph them and estimate how much you are losing. Then you can decide whether it's worth the expense of an upgrade.

You could split your strings and install a second (say 2.5k) inverter beside the first. It would entail some wiring changes but it MIGHT save money over replacing the inverter.

Talk to a local installer.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
sergeykoren

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Posts: 7
Reply with quote  #13 
Quote:
Originally Posted by stmbtwle
If you have records you can graph them and estimate how much you are losing. Then you can decide whether it's worth the expense of an upgrade. You could split your strings and install a second (say 2.5k) inverter beside the first. It would entail some wiring changes but it MIGHT save money over replacing the inverter. Talk to a local installer.


Please find what i am getting right now on a screenshot. 
It's not looks right to me and i believe during summer time it will be worth. I still did not finish project and i believe installer suppose to fix this. This is not my fault. Screenshot 2017-12-29 07.36.12.png 

stmbtwle

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Reply with quote  #14 
The dip from 10 to 11 is probably shading or clouds, but the flat top is very suspicious. It definitely looks like "something" is limiting your output. From what you have said, my first guess would be the inverter. What is your installer's explanation?

I'd print out several days of this data, find a local expert and talk to him.

As to who is responsible for the cost I can't say, but I would go back to whoever recommended the 5kw inverter in the first place. If the installer was following someone elses directions then I would think he is not responsible. He may rectify the problem but I think you're still on the hook for the additional cost. Get out your contract...

Rick, as the EET, what is your opinion?

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Gordy

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Posts: 137
Reply with quote  #15 
"You could split your strings and install a second (say 2.5k) inverter beside the first. It would entail some wiring changes but it MIGHT save money over replacing the inverter.

Talk to a local installer.

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Willie, Tampa Bay"

If he is going to be left on the hook to fix this, He could get the bigger unit and keep the old on hand as an emergency replacement if/when the other fails.

Just a thought

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Gordy,
Minnesota
Rick H Parker

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Posts: 774
Reply with quote  #16 
Rick, as the EET, what is your opinion?

No where near enough information to form an opinion.
Don't know what his equipment is.
Don't know what that graph is.
Don't know what the vertical scale is or the vertical units on that graph.

I could make a lot of assumptions and form a wild guess, but not what I would consider an opinion.


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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
sergeykoren

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Posts: 7
Reply with quote  #17 
Quote:
Originally Posted by Rick H Parker
Rick, as the EET, what is your opinion?

No where near enough information to form an opinion.
Don't know what his equipment is.
Don't know what that graph is.
Don't know what the vertical scale is or the vertical units on that graph.

I could make a lot of assumptions and form a wild guess, but not what I would consider an opinion.


Rick, 
1. Solar array - 24x Lg neon 315n1c-g4 with optimizers
2. SolarEdga HD-Wavw SE5000H inverter
3. Graph is from SolarEdge monitoring website

Attached Images
jpeg Capture.jpg (30.62 KB, 8 views)

Rick H Parker

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Reply with quote  #18 
Rick, 
1. Solar array - 24x Lg neon 315n1c-g4 with optimizers
2. SolarEdga HD-Wavw SE5000H inverter
3. Graph is from SolarEdge monitoring website


No Charge Controller and Battery Bank ... must be a grid connect with no storage.

Now the graph make sense. It peaks at 5K which is the maximum transfer rate of the SolarEdge HD-Wave SE5000H.

As for the mid-morning dip, that could be two things.
1. Shading at your location is causing your production to drop.
2. In your area, the demand for electrical energy drops mid-morning. 




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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
sergeykoren

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Posts: 7
Reply with quote  #19 
Quote:
Originally Posted by Rick H Parker
Rick, 
No Charge Controller and Battery Bank ... must be a grid connect with no storage.

Now the graph make sense. It peaks at 5K which is the maximum transfer rate of the SolarEdge HD-Wave SE5000H.

As for the mid-morning dip, that could be two things.
1. Shading at your location is causing your production to drop.
2. In your area, the demand for electrical energy drops mid-morning. 


The reason, why i created this post, i need to understand if i need to talk with installer to replace inverter with bigger transfer rate. I see, that my solar array can produce more, event right now, during the winter time. 

Rick H Parker

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Reply with quote  #20 
The reason, why i created this post, i need to understand if i need to talk with installer to replace inverter with bigger transfer rate. I see, that my solar array can produce more, event right now, during the winter time.


You would need to look at what your net metering credits are worth and figure out if the cost of a bigger inverter is justified. This is not a technical issue, it is a financial issue.

A third possible reason for the mid-morning dip, your consuming energy at a faster rate then you producing it.

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
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