Navitron Renewable Energy and Sustainability Forum

SOLAR PHOTOVOLTAIC => Solar Photovoltaic Systems => Topic started by: Pigsywigsy on April 11, 2019, 01:42:36 PM



Title: Solar Good Times 🌞
Post by: Pigsywigsy on April 11, 2019, 01:42:36 PM
Hello All,

Thought I'd post something positive instead of moaning about my wind turbine. Whilst the GSHP and Bergey Wind Turbine chaos has rolled on and on my Solar PV has done it's thing since March 2011, only had issues initially with the installers and salesman (who ended up in jail). Yesterday it hit 26,000kwh at the generation meter which is significant as I paid 13,000 for the kit and I'm on around 50p/kwh FIT, in reality taking electricity bill savings into account it paid for itself a wee while ago but I can now look at the generation meter and be happy it was a good decision to install solar 😁

Fingers crossed my Inverter has a few more years left in it, 17 years of profit to come....  exhappy:


Title: Re: Solar Good Times 🌞
Post by: biff on April 11, 2019, 01:50:23 PM
We had a record day yesterday as well.,
                                 Long live PV and wind power, ;D
                               Biff


Title: Re: Solar Good Times 🌞
Post by: Pigsywigsy on April 11, 2019, 04:24:22 PM
That's brilliant Biff, unsure if it beat previous April days but we've hit 22kwh here last two days which is nice, been having to scrape ice off the cars early doors then outside in a t shirt later in the day, welcome to the crazy world of Scottish weather 😜


Title: Re: Solar Good Times 🌞
Post by: Solarchaser on April 11, 2019, 07:29:07 PM
Just south east of Glasgow and made 48kwh yesterday.
Unfortunately more than half went to grid, but heh, less than a kWh of import can never be a bad thing


Title: Re: Solar Good Times 🌞
Post by: Pigsywigsy on April 11, 2019, 08:54:34 PM
Just south east of Glasgow and made 48kwh yesterday.
Unfortunately more than half went to grid, but heh, less than a kWh of import can never be a bad thing

I'm not far from South East of Glasgow either Solarchaser, 48kwh is great, I assume your PV system is bigger that 4kw?


Title: Re: Solar Good Times 🌞
Post by: Solarchaser on April 11, 2019, 11:10:56 PM
Yeah, had a 4kw on the roof for 4 years, just added 6.6 to the garage.
Hoping to reduce the grid dependence quite some, and power our ev for free (and make good use of 10kwh of batteries)


Title: Re: Solar Good Times 🌞
Post by: brackwell on April 12, 2019, 08:27:17 AM
The holy grail in the UK is to reach 7.5kwh/kwp (ie 30kwh from 4kw system) which is just possible on the south coast on a few days. Perhaps with long days and clear skies in Scotland ??  In realty though peaks are irrelevant because rarely is there any demand big enough but EV+ HW diverter is getting closer.
In net annual terms my PV (4.64kwp) provides house,HW and EV (low mls 5K)
Ken


Title: Re: Solar Good Times 🌞
Post by: Pigsywigsy on April 12, 2019, 09:34:12 AM
The holy grail in the UK is to reach 7.5kwh/kwp (ie 30kwh from 4kw system) which is just possible on the south coast on a few days. Perhaps with long days and clear skies in Scotland ??  In realty though peaks are irrelevant because rarely is there any demand big enough but EV+ HW diverter is getting closer.
In net annual terms my PV (4.64kwp) provides house,HW and EV (low mls 5K)
Ken
Hi Ken, 30kwh has never been reached here, somewhere between 28 & 28.5 is the best we've produced which is great for our site here as pre 12.00 we produce very little as the panels are on a roof with quite a steep pitch facing SW.. As I'm on a 0 feedback to the grid and have a turbine (works occasionally, don't ask 🙄) excess power generated heats a thermal store which then heats mu GSHP tanks once warm enough. Downside to this is I need to leave my UFH on in the summer to dump excess pwr, batteries may be added eventually here.


Title: Re: Solar Good Times 🌞
Post by: marshman on April 12, 2019, 03:53:22 PM
Its's been said on here before that total generation figures are meaningless for comparison purposes, it is the kWh/kWpk figure that means more, it then allows for some comparison between systems. So a good milestone is 10MWh/kWpk total generation, mine hit that figure last December. Having said that it is satisfying when big numbers come up  :)

With regards to the 8kWh/kWpk in a day it is a tough one to get to. My Sharp system has only got there once to my knowledge on 3/6/2013 when it generated 25.4kWh for a 3.15kWpk (Panels) 3kW (inverter). It has had a few near misses. But to be honest I now only look at monthly figures, after about 3 years the novelty of daily figures wore off! The Suntech system best effort is around 7.5kWh/kWpk on the same day.  I might do better if I replaced the old SMA SB3000 inverter with a more efficient one, but it is not worth the expense unless the SB3000 dies.

Roger


Title: Re: Solar Good Times 🌞
Post by: Solarchaser on April 12, 2019, 05:05:32 PM
I'd imagine it will be much harder to reach a better kWh/ kwp on bright days if you have oversized panels to inverter, but likely easier on a duller day.

Most 4kw systems are on a 3.68kw inverter. Which my original system is.
But the second system is 6.6kw of panels through a 3.68kw inverter.
My reasoning for that was 1. It's an east west system rather than south, and also 2. In bonnie Scotland it's far more likely to get overcast days than bright ones, and so more panels for small inverter is likely to be more efficient.

My argument would probably be that inverter power per kWh is better, but then my over sized system would have a big advantage over a evenly specced panel-inverter system.

Maybe it should be a combination of panel power and inverter power, or one devided by the other, to provide a line for like comparison around the year.


Title: Re: Solar Good Times 🌞
Post by: Scruff on April 14, 2019, 12:52:56 PM
Since Summertime started my batt is fully charged daily. Sun, cloud, rain.
265W is a good size for a camper.

I can fill the gaps with 90A of diesel electric...it helps but it's strictly a secondary source between April and November.


Title: Re: Solar Good Times 🌞
Post by: Pigsywigsy on April 14, 2019, 01:27:31 PM
Looks cool Scruff, I assume that turbine folds down when you're moving?


Title: Re: Solar Good Times 🌞
Post by: Scruff on April 14, 2019, 01:44:32 PM
That turnip Mk III, never graduated field tests.
I get the same powah silently by turning off a 7W LED.
...or more practically by having DC lighting dimmers fitted.


Title: Re: Solar Good Times 🌞
Post by: Pigsywigsy on April 14, 2019, 04:16:38 PM
Ha, yep, bet it still produces more than my Bergey though 🙄 and was a fraction of the cost 😕


Title: Re: Solar Good Times 🌞
Post by: Scruff on April 14, 2019, 04:20:54 PM
7W peak @ >7m/s

1.2m wingspan
~80 invested
Prime mover:
4W bicycle Dynohub.

Verdict.
Go > 2.5m blade diameter or go home.