Intersting post on 4 + kwp systems

[Berneray]

Read this blog with interest.

What do you guys think....

Thinking outside of the 4kWp box | Solar Power Portal

 

[Worcester]

They are a bit slow, some of us have understood this and been doing it for a while (since March last year..) . We just keep it as one of those special things we can do for our customers


BayWa r.e is the new name for Dulas MHH of I remember rightly (wrong sometimes )

 

[Berneray]

Worchester.......you're like an Alpha (Syfy USA series)....you have special powers...Yours is an insight into pv solar....

 

[Gavin A]

done loads of 5kWp south facing, 6kWp east west in the last year since the gap between 0-4 and 4-10kWp dropped, mostly on G83 16amp limit.

Dulas are only jumping on that anyway as they can't seem to manage to get hold of any decent 250Wp panels.

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Worchester.......you're like an Alpha (Syfy USA series)....you have special powers...Yours is an insight into pv solar....

I think it's more commonly known as a spreadsheet

 

[wiggly]

On this topic how do you then put this through the system assuming 16 x 260 giving 4160.

Trying to understand how we can do this to get this to work for us as an additional sales tool.

regards

wiggly

 

[Worcester]

@Wiggly if you read the link in the first post (reproduced below ) it makes sense:

Option 1:
16 x LG250 modules could be installed, providing 4kWp for £7,000.
Total benefit (FiT + Electricity Savings) in first year is £844.28. Assuming no electricity inflation, this gives a payback of 8.29 years.


Option 2:
16 x LG260 modules, providing a 4.16kWp system, which is just over the FiT band. The system price increases slightly due to the higher cost of the modules, so is £7,172.48 in total.
Total benefit in the first year is slightly less because of the lower FiT rate at £823.94 a year, but payback is still good at 8.7 years.

i.e. it's not quite as good at 16 x 250, however it still makes good financial sense. The only cost difference is the panels, mounting, inverter, installation, overheads etc are the same. (your gross margin as a % of turnover may be reduced, though margin / job is the same)

http://www.solarpowerportal.co.uk/guest_blog/thinking_outside_of_the_4kwp_box_3478

 

[Gavin A]

On this topic how do you then put this through the system assuming 16 x 260 giving 4160.

Trying to understand how we can do this to get this to work for us as an additional sales tool.

regards

wiggly

it won't work - needs to be above 4.5kWp or so for the finances to stack up IMO vs a straight 4kWp system.

 

[SibertSolar]

All good advice, and pretty standard practice as others have already said. Just one thing to bear in mind when using a 16A limited/G83 certified inverter is the power (voltage and current) limits per MPPT. Not all inverters in that arena will allow the higher voltage/current levels present on the string configurations necessary to suit a higher quantity of panels, or higher wattage panels. Not likely to be much of an issue but worth bearing in mind all the same....

 

[wiggly]

Worcester I get the pay back scenario, ie over 4kw we drop to 13.5p on fit.

What I wasn't sure was the paper work,
If We install a compliant 16 amp rated inverter that matches the voltages (as per sibert) now when it comes to the mcs sign off and g83 how does that come together ( hopefully this makes sense)
regards
wiggly

 

[Ian-LS]

MCS cert would be 4.16 kW whereas G83 notification would just be 3.68 kW 16 amps per phase as long as using an inverter limited to 3.68 kW

 

[wiggly]

duuh,
so fairly simple really so as long as your inverter can take the loads/ voltages of the higher wattage panels then jobs a good un.
regards

wiggly