RE: Re: Solar PV ?

[Marcus Warrington <marcus.warrington@xxxxxxxxxx>]

Phil,


Having been through it myself I know how you feel.. :)

At the end of the day for any given size of array it basically comes down
t=
o how much will you pay for it and how much will it earn you.

My personal check list was;

Mono over Poly
Zero negative tolerance i.e I didn't like the Sharps because of their.
-5%/=
+10% tolerance.
Address of previous installs
The installer that inspired me with the most confidence that they knew
what=
they were doing
Cheapest installation using quality parts like Schuco roof mounting
systems=
.
Installer that didn't want 60% deposit upfront!


=D8  The energy generation estimates vary from...

There really shouldn't be much if any variation (for the same sixe system)
=
since the standard SAP formula used to work this out is pretty straight
for=
ward and all compaines should be using so customers get a realistic
estimat=
e. I found a lot of compaines like to inflate the amount you'll earn,
prima=
rily by putting in higher electricity costs (to increase savings) or not
ap=
plying the empiricle SAP factor (0.8).

The standard formula is ;

0.80 x kWp x S x ZPV

Where ;
kWp =3D system size e.g. 3.99
ZPV =3D overall shading factor (1 =3D <20% , 0.8 =3D 20%-60%, 0.65 =3D
>60%=
-80% , 0.5 =3D >80%)
S =3D Annual Solar Radiation
Tilt of collector  Horizontal :   961
Tilt of collector            30 :   South =3D 1073 ,   SE/SW=3D1027=
,   E/W =3D913 ,   NE/NW =3D785 ,   North=3D730
Tilt of collector            45 :   South =3D 1054 ,   SE/SW=3D997 =
,     E/W =3D854 ,   NE/NW =3D686 ,   North=3D640
Tilt of collector            60 :   South =3D 989 ,     SE/SW=3D927=
,    E/W =3D776 ,   NE/NW =3D597 ,   North=3D500
Tilt of collector      Verticle :   South =3D 746 ,     SE/SW=3D705=
,    E/W =3D582 ,   NE/NW =3D440 ,   North=3D371

Another way of getting a reasonable estimate is using the pvtest site ;

http://re.jrc.ec.europa.eu/pvgis/apps4/pvest.php

Marcus

From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of P=
hilip Coombes
Sent: 08 August 2011 16:07
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] Re: Solar PV ?



I have not (yet) had an install but I have now gathered quotes off four
companies, and am at decision point.

1a - 3.995kW (17 x 235W REC) + Sunny Boy =3D ~=A312,500
1b - 3.96kW (18 x 220W Innotech) + Sunny Boy =3D ~=A311,800
2 - 4kW (16 x 250W Sanyo H250) + Sunny Boy =3D ~ =A313,300
3a - 3.92kW (16 x 245W Sharp) + Fronius =3D ~=A313,000
3b - 3.995kW (17 x 235W Sanyo) + Sunny Boy =3D ~=A316,100 (ouch!)
4 - 3.8kW (16 x 240W Sanyo) + Fronius/Sunny Boy =3D ~=A314,300

There's quite a price range in there and I'm not entirely sure what to
use as the selection criteria. The energy generation estimates vary from
3200kWh (the 16k system) to 3600kWh with the payback estimate going from
around 7 years to around 10.

I like the Sanyo panels even though they are expensive but a few places
seem to suggest REC (and they come out well in independent tests,
apparently) but I've not seen any comment from people who actually have
them.

Phil

On 08/08/2011 15:21, craig wrote:
> Any updates on recent installs?
>
> Marcus - any news on your install, did the inverter go in loft or
cellar?
>
> Stewart - have you made a decision on what type of inverters to use,
micr=
o
> vs. string?
>
> Cheers,
>
> Craig
>
>
>
> ------------------------------------
>
>
> Yahoo! Groups Links
>
>
>
--
Philip Coombes
Triornis Ltd

email: philip.coombes@xxxxxxx<mailto:philip.coombes%40triornis.net>
phone: +44 117 230 0566
skype: triornis



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