#1 July 5, 2016 13:12:18

oldsilverfox
Registered: 2012-05-13
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25% more Output from Inverter Rewiring, Too Good to be True ?

Hi everyone,
I had a cold call this morning from a firm called Solarplants.org.uk

They were offering an intriguing concept. They reckon that IF one's solar panels were rewired in parallel, and a new replacement inverter was installed which would cater for this reconfigured array, one could squeeze up to 25% more power from your system.

Their new inverter has a 25 year warranty. They allege that the rewiring would not breach the FIT contract terms.

It really does seem too good to be true, so what is the snag, apart from dealing with a firm with a fairly recent track record ?

Any thoughts gratefully read !!!

David.
URN757

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#2 July 6, 2016 07:41:41

WendyNorthrop
Registered: 2012-04-23
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25% more Output from Inverter Rewiring, Too Good to be True ?

My first thoughts are: what sort of documentary evidence (on-line or hard-copy) do they provide to support their assertions? Without some form of sensibly accrued comparative data to analyse anyone can assert anything as true.

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#3 July 6, 2016 08:22:44

diandjeremy
Registered: 2013-01-07
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25% more Output from Inverter Rewiring, Too Good to be True ?

Morning all
Likewise, I had a call two days ago from Solarplants, with the same message. This claim is obviously spreading. Is it another urban myth or does it have substance? Do our solar team of experts yet have a view?
My understanding of the way the collection and inversion works is that there is no capacity for a 25% gain anywhere in the system.
Jeremy
URN 2212

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#4 July 6, 2016 09:54:40

prodigymad
Registered: 2015-02-06
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25% more Output from Inverter Rewiring, Too Good to be True ?

Hmm, there may be something in it:

http://www.renewableenergyworld.com/articles/print/rewna/volume-13/issue-4/solar-energy/solar-array-design-parallel-wiring-opens-new-doors.html

Perhaps the new inverter is geared around working at a set, static voltage and therefore allowing the panels to start up earlier / longer.

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#5 July 6, 2016 09:59:14

oldsilverfox
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25% more Output from Inverter Rewiring, Too Good to be True ?

After having some time to think about it, here is my take.
The Germans are leaders in solar technology, mainly due to their government's green policies, and as a result Sunny are one of the most respected and installed inverters (I suspect that our friends in Sheffield could confirm that they are the most widely used inverters in the UK).
Given this, if it really is a genuine breakthrough to increase our outputs, I am amazed that Sunny are not in the frame offering a broadly similar product.
I cannot see how you could patent the general concept any more than you can patent the design of a condensing boiler, for example. Neither is wiring in series or parallel a patentable idea.
To sum up, I think that I'll wait for an offering from a more well established company.

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#6 July 6, 2016 21:05:42

bhommels
Registered: 2011-10-03
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25% more Output from Inverter Rewiring, Too Good to be True ?

Interesting find. Looking at the website and reading through the blurb that goes with a product launch nowadays they assume an “new generation of low-cost, high-efficiency electronic devices that allow a solar module to deliver a fixed DC voltage to a DC power bus.”
This magical device optimises the working point for every panel individually, and converts the harvested power so it acts as a fixed voltage, variable current power source.
This sounds very much like a micro inverter, with the novelty being that they are wired in parallel.
In systems with severe localised shading, going from a single string to micro inverters could yield a 25% increase in delivered power, so technically their claim is not wrong, just very specific.
For well balanced, well situated systems it would probably result in a few % gain, as documented by early adopters of micro-inverter systems.

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#7 July 7, 2016 13:30:20

prodigymad
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25% more Output from Inverter Rewiring, Too Good to be True ?

After more digging it looks like they are suggesting to install the following:

* SolarEdge Optimisers - http://www.solaredge.com/us/products/power-optimizer#/

* SolarEdge Inverter - http://www.solaredge.com/us/products/pv-inverter/single-phase#/

As stated above it looks like the Optimisers are similar to the Micro-Inverter idea where they control the voltage / MPPT per PV module.

Pricewise it looks like the Optimisers will be around £60 each + £700-£800 for the new inverter, plus whatever installation costs.

Probably worth doing if your existing inverter has gone pop or on a new install. Or perhaps if you are swapping to the SolarEdge system to get a Tesla Powerwall.

I don't think a 25% increase in output would warrant spending £1k+?

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#8 July 9, 2016 21:39:17

martint123
Registered: 2013-01-09
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25% more Output from Inverter Rewiring, Too Good to be True ?

It would be expensive for me - I'm assuming they would have to lift the panels to get at the present twin series layout I have and being above a conservatory that would be scaffolding again….. Wallet says “ouch”

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#9 July 31, 2016 09:09:51

guava090
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25% more Output from Inverter Rewiring, Too Good to be True ?

I have a solaredge with all the alleged system facing due south down south in Hampshire. with no shading,
URN221 have a look is it generating 25% more than you? If not there is your answer.

DE666L.

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#10 Aug. 1, 2016 14:33:38

oldsilverfox
Registered: 2012-05-13
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25% more Output from Inverter Rewiring, Too Good to be True ?

Hi guava090,
As suggested I had a quick look at your generation figures in the last Excel spreadsheet and it would appear that we are generating around the same output per month so, as you say there is the answer !!!
End of.


BTW mine is a 2.5kW array, roughly where in South Hampshire are you ? You are not showing up on the maps.

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