Re: Solar PV ?

["severnsource" <groups@xxxxxxxxxxxxxxxxxxxx>]

So far my system is producing a few percent more than the most
optimistic P=
VGIS prediction. But the better predictors use long term climate averages,
=
so the only way that you'll really know is after several years of logging.=
=20

I'm happy with the performance so far, in the long term it's all down to
th=
e weather!

--- In ukha_d@xxxxxxx, Marcus Warrington <marcus.warrington@...> wr=
ote:
>
> Thanks for the info.
>=20
> I'd already played around with the SunnyDesign software, but it just
give=
s you numbers and percentage etc , I'd no idea how they translated into
the=
real world, so its nice to know your situation since your DC runs are abou=
t the same  :)
>=20
> I'll probably go ahead and put in the cellar next to the consumer
unit, b=
ut since the install is a set price regardless (their philosophy is win
som=
e, lose some), I'll get them to use the 10mm cable just to really minimise
=
any losses.
>=20
> Is your SolarPV array performing to expectations, are you producing as
mu=
ch as the estimation said ?
> Most people I've talked to seem to be exceeding the estimation, which
is =
nice to hear.
>=20
> Marcus
>=20
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of=
severnsource
> Sent: 12 July 2011 11:31
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Re: Solar PV ?
>=20
>=20
>=20
> Download the Sunny Design software http://www.sma.de/en/products/software=
/sunny-design.html. That will give cable losses, amongst other things. My
i=
nverter is in the garage with about 15M of DC cable (2 strings, 4mm cable
f=
or each) and 15M AC (6mm cable). The cable losses are insignificant.
>=20
> --- In ukha_d@xxxxxxx<mailto:ukha_d%40yahoogroups.com>,
Marcus Wa=
rrington <marcus.warrington@> wrote:
> >
> >
> > Stewart,
> >
> > I looked at the micro inverters but the cost (for me) was
prohibitive. =
21 panels each with its own micro inverter worked out around =A34000 , the
=
cost of a single 3 string, transformerless SMA inverter was more like
=A316=
00. I was looking at the SolarPV as an investment so the bottom line was
no=
t how efficient things would be but how much profit they would earn me
over=
25 years. I don't believe the micro inverters could ever earn me back enou=
gh in the 25 year period to pay for the cost differential. Of course if I
w=
as only having a few panels then it may work out differentially, e.g a
1.2K=
wh array of 240W panels would only need 5 micro inverters so may well even
=
have a smaller capital cost than buying a single central inverter.
> >
> > Having said all that I guess it does depend a lot of the amount
of shad=
ing you have, I only have a small localised amount so can work around it
by=
having the potentially shaded panels on separate smaller string.
> >
> > Regarging the noise issue, I belive (and hope!) that this is an
issue w=
ith the ones that have a transformer in them and that the transformerless
o=
nes do not generate a noise (or at least nowhere near as loud) as well as
b=
eing slightly more efficient.
> >
> > Our fitting date is in two weeks, but I'm still undecided if I
should f=
it the inverter in the loft, where it will will get hot but have short DC
c=
able runs, or have it in cellar where it will be nice and cool (and easily
=
accessable) but have a longer (~15M) DC cable run. The installer seems
conf=
ident that running 10mm DC cables will limit any ineffeciencies upto
around=
25M.
> >
> > Marcus
> >
> > From: ukha_d@xxxxxxx<mailto:ukha_d%40yahoogroups.com>
[mailto:u=
kha_d@xxxxxxx<mailto:ukha_d%40yahoogroups.com>]
On Behalf Of Stewar=
t
> > Sent: 11 July 2011 11:12
> > To: ukha_d@xxxxxxx<mailto:ukha_d%40yahoogroups.com>
> > Subject: RE: [ukha_d] Solar PV ?
> >
> >
> >
> > Kevin/Marcus,
> >
> > Had the chap from Sun Renewable here last week (thanks for the
> > recommendation Mark and, YES, we did mention your name to Tom)
and we'r=
e
> > looking at using Sharp panels and micro-inverters (1 per panel)
made by
> > Enecsys. These micro-inverters fit directly onto the back of each
panel=
and
> > solve the problem of one shaded panel bringing down the output of
the a=
rray
> > and also, as we were worried about the noise generated by a loft
mounte=
d
> > inverter, these will be mounted outside so noise won't be a
problem (we
> > hope!).
> >
> > The micro-inverters are a recent development so there's no
worthwhile
> > reliability data yet, however, they do come with a 20 year
warranty.
> >
> > regards
> >
> > Stewart
> >
> > From: ukha_d@xxxxxxx<mailto:ukha_d%40yahoogroups.com><mailto:uk=
ha_d%40yahoogroups.com> [mailto:ukha_d@xxxxxxx<mailto:ukha_d%40yaho=
ogroups.com><mailto:ukha_d%40yahoogroups.com>]
On Behalf Of
> > Marcus Warrington
> > Sent: 16 May 2011 15:36
> > To: ukha_d@xxxxxxx<mailto:ukha_d%40yahoogroups.com><mailto:ukha=
_d%40yahoogroups.com>
> > Subject: RE: [ukha_d] Solar PV ?
> >
> > Kevin,
> >
> > I think in theory it still does, but you can get panels with
built in b=
ypass
> > diodes that should mean only those cells (or possibly string of
cells)
> > within the panel that are shaded get affected. I have another
installer
> > coming tonight so I'll be quizzing him a little more about this
:)
> >
> > Marcus
> >
> > From: ukha_d@xxxxxxx<mailto:ukha_d%40yahoogroups.com><mailto:uk=
ha_d%40yahoogroups.com> <mailto:ukha_d%40yahoogroups.com>
> > [mailto:ukha_d@xxxxxxx<mailto:ukha_d%40yahoogroups.com><mailto:=
ukha_d%40yahoogroups.com> <mailto:ukha_d%40yahoogroups.com>
] On Behalf
> > Of Kevin Hawkins
> > Sent: 14 May 2011 14:15
> > To: ukha_d@xxxxxxx<mailto:ukha_d%40yahoogroups.com><mailto:ukha=
_d%40yahoogroups.com> <mailto:ukha_d%40yahoogroups.com>
> > Subject: Re: [ukha_d] Solar PV ?
> >
> > If you had an array of panels but one of them was in shade ,
perhaps
> > from a chimney stack , does this same situation occur ? I'm
> > assuming not as it must be correctable via electronics but just
checkin=
g...
> >
> > K
> >
> > On 13/05/2011 09:06, Marcus Warrington wrote:
> > > Since I've now read that output of a string of panels is
dictated by =
the
> > lowest producing panel, that's means if I have a string of Sharp
panels=
all
> > producing +10% but the last one produces -5% then its as though
all the
> > panels are at -5%.
> > > Marcus
> > >
> > >
> > >
> >
> > [Non-text portions of this message have been removed]
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>=20
>=20
>=20
> [Non-text portions of this message have been removed]
>




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