Anyone here got solar? Just had a quote for a 7.5kW system with a 9.5kWh
battery and a Givenergy 5kW hybrid inverter. G99 approval etc.

We’ve been quoted £14,900. Is this out of order or not unreasonable?

Tim

--
Please don't feed the trolls

On 21/07/2023 09:33, Tim+ wrote:
>
> Anyone here got solar? Just had a quote for a 7.5kW system with a 9.5kWh
> battery and a Givenergy 5kW hybrid inverter. G99 approval etc.
>
> We’ve been quoted £14,900. Is this out of order or not unreasonable?
>
> Tim
>

Regardless of the quote, what are the economics of having this system?

Pancho <Pancho.Jones@proton.me> wrote:
> On 21/07/2023 09:33, Tim+ wrote:
>>
>> Anyone here got solar? Just had a quote for a 7.5kW system with a 9.5kWh
>> battery and a Givenergy 5kW hybrid inverter. G99 approval etc.
>>
>> We’ve been quoted £14,900. Is this out of order or not unreasonable?
>>
>> Tim
>>
>
> Regardless of the quote, what are the economics of having this system?
>

Estimated payback time of 7 years. Estimated savings of £52,000 over its
lifespan.

Tim

--
Please don't feed the trolls

In article
<1061138594.711622576.346761.tim.downie-gmail.com@news.individual.net>,
Tim+ <tim.downie@gmail.com> wrote:
> Pancho <Pancho.Jones@proton.me> wrote:
> > On 21/07/2023 09:33, Tim+ wrote:
> >>
> >> Anyone here got solar? Just had a quote for a 7.5kW system with a
> >> 9.5kWh battery and a Givenergy 5kW hybrid inverter. G99 approval etc.
> >>
> >> We've been quoted £14,900. Is this out of order or not unreasonable?
> >>
> >> Tim
> >>
> >
> > Regardless of the quote, what are the economics of having this system?
> >

> Estimated payback time of 7 years. Estimated savings of £52,000 over its
> lifespan.

> Tim

I was quoted for a 10kW system with an estimated payback time of 20 years.
I did not follow it up.

--
from KT24 in Surrey, England - sent from my RISC OS 4té
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle

On 21/07/2023 09:58, Tim+ wrote:
> Pancho <Pancho.Jones@proton.me> wrote:
>> On 21/07/2023 09:33, Tim+ wrote:
>>>
>>> Anyone here got solar? Just had a quote for a 7.5kW system with a 9.5kWh
>>> battery and a Givenergy 5kW hybrid inverter. G99 approval etc.
>>>
>>> We’ve been quoted £14,900. Is this out of order or not unreasonable?
>>>
>>> Tim
>>>
>>
>> Regardless of the quote, what are the economics of having this system?
>>
>
> Estimated payback time of 7 years. Estimated savings of £52,000 over its
> lifespan.

https://www.moneysavingexpert.com/utilities/free-solar-panels/

IMO the estimated savings of £52k seems very exaggerated.

Most of what you generate will be during the summer when you possibly
need it lest but to make the most of the savings you need to use all of
what you produce rather than feed it back to the grid.

In winter you may not be able to generate enough to, say, charge an EV
and the battery. If you are also going to have electric central heating
as well then you will be buying from the grid during the winter.

You really need to ignore any figures on savings given by a salesman and
do some sensible calculations yourself.

--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

On Fri, 21 Jul 2023 10:53:26 +0100, alan_m <junk@admac.myzen.co.uk>
wrote:

>On 21/07/2023 09:58, Tim+ wrote:
>> Pancho <Pancho.Jones@proton.me> wrote:
>>> On 21/07/2023 09:33, Tim+ wrote:
>>>>
>>>> Anyone here got solar? Just had a quote for a 7.5kW system with a 9.5kWh
>>>> battery and a Givenergy 5kW hybrid inverter. G99 approval etc.
>>>>
>>>> We’ve been quoted £14,900. Is this out of order or not unreasonable?
>>>>
>>>> Tim
>>>>
>>>
>>> Regardless of the quote, what are the economics of having this system?
>>>
>>
>> Estimated payback time of 7 years. Estimated savings of £52,000 over its
>> lifespan.
>
>
>https://www.moneysavingexpert.com/utilities/free-solar-panels/
>
>IMO the estimated savings of £52k seems very exaggerated.
>
>Most of what you generate will be during the summer when you possibly
>need it lest but to make the most of the savings you need to use all of
>what you produce rather than feed it back to the grid.
>
>In winter you may not be able to generate enough to, say, charge an EV
>and the battery. If you are also going to have electric central heating
>as well then you will be buying from the grid during the winter.
>
>You really need to ignore any figures on savings given by a salesman and
>do some sensible calculations yourself.

Solar panel 'efficiency' (capacity factor) is about 5% of the
nameplate capacity in winter (short days, lots of cloud etc), rising
to about 25% in summer, and averaging somewhere around 10-15% across
the year. Much depends on type of panel, their orientation and their
latitude - the further north the worse they get. South of France and
North Africa are probably OK, but in northern Europe it's questionable
whether they ever generate enough electricity to cover the energy
required to make them (EROEI: energy returned on energy invested), but
it's a difficult calculation.

Some real numbers here from a solar farm in the south of England.
Browse around it. https://tinyurl.com/q2993y9

--
Chris

On 21 Jul 2023 at 12:26:43 BST, "Chris Hogg" <me@privacy.net> wrote:

> On Fri, 21 Jul 2023 10:53:26 +0100, alan_m <junk@admac.myzen.co.uk>
> wrote:
>
>> On 21/07/2023 09:58, Tim+ wrote:
>>> Pancho <Pancho.Jones@proton.me> wrote:
>>>> On 21/07/2023 09:33, Tim+ wrote:
>>>>>
>>>>> Anyone here got solar? Just had a quote for a 7.5kW system with a 9.5kWh
>>>>> battery and a Givenergy 5kW hybrid inverter. G99 approval etc.
>>>>>
>>>>> We’ve been quoted £14,900. Is this out of order or not unreasonable?

>>>> Regardless of the quote, what are the economics of having this system?
>>>
>>> Estimated payback time of 7 years. Estimated savings of £52,000 over its
>>> lifespan.

I think we'd need to see how that figure was arrived at.

>> https://www.moneysavingexpert.com/utilities/free-solar-panels/
>>
>> IMO the estimated savings of £52k seems very exaggerated.
>>
>> Most of what you generate will be during the summer when you possibly
>> need it lest but to make the most of the savings you need to use all of
>> what you produce rather than feed it back to the grid.
>>
>> In winter you may not be able to generate enough to, say, charge an EV
>> and the battery. If you are also going to have electric central heating
>> as well then you will be buying from the grid during the winter.
>>
>> You really need to ignore any figures on savings given by a salesman and
>> do some sensible calculations yourself.
>
> Solar panel 'efficiency' (capacity factor) is about 5% of the
> nameplate capacity in winter (short days, lots of cloud etc), rising
> to about 25% in summer, and averaging somewhere around 10-15% across
> the year. Much depends on type of panel, their orientation and their
> latitude - the further north the worse they get. South of France and
> North Africa are probably OK, but in northern Europe it's questionable
> whether they ever generate enough electricity to cover the energy
> required to make them (EROEI: energy returned on energy invested), but
> it's a difficult calculation.
>
> Some real numbers here from a solar farm in the south of England.
> Browse around it. https://tinyurl.com/q2993y9

So are you saying that in winter the OP can expect to get a massive 375W and
in summer 1.875kW ? Would that be average over some period, or peak at 12.00
midday on some average day?

--
The reason you think government is the solution is because you think freedom is the problem. But the truth is that government ensures that the most evil, ruthless people end up in control, because the state is a single point of failure, and a high-value target of corruption.

Alan Lovejoy

On 21/07/2023 12:48, Tim Streater wrote:
> So are you saying that in winter the OP can expect to get a massive 375W and
> in summer 1.875kW ? Would that be average over some period, or peak at 12.00
> midday on some average day?

Peaks.

--
“The fundamental cause of the trouble in the modern world today is that
the stupid are cocksure while the intelligent are full of doubt."

- Bertrand Russell

On 21/07/2023 10:53, alan_m wrote:
> On 21/07/2023 09:58, Tim+ wrote:
>> Pancho <Pancho.Jones@proton.me> wrote:
>>> On 21/07/2023 09:33, Tim+ wrote:
>>>>
>>>> Anyone here got solar? Just had a quote for a 7.5kW system with a
>>>> 9.5kWh
>>>> battery and a Givenergy 5kW hybrid inverter. G99 approval etc.
>>>>
>>>> We’ve been quoted £14,900.  Is this out of order or not unreasonable?
>>>>
>>>> Tim
>>>>
>>>
>>> Regardless of the quote, what are the economics of having this system?
>>>
>>
>> Estimated payback time of 7 years. Estimated savings of £52,000 over its
>> lifespan.
>
>
> https://www.moneysavingexpert.com/utilities/free-solar-panels/
>
> IMO the estimated savings of £52k seems very exaggerated.
>
> Most of what you generate will be during the summer when you possibly
> need it lest but to make the most of the savings you need to use all of
> what you produce rather than feed it back to the grid.
>
> In winter you may not be able to generate enough to, say, charge an EV
> and the battery.  If you are also going to have electric central heating
> as well then you will be buying from the grid during the winter.
>
> You really need to ignore any figures on savings given by a salesman and
> do some sensible calculations yourself.
>
I agree it needs case-specific calculations and the savings look high at
first sight. (>20,000+ kWh p.a. on the back of my envelope.) OTOH Tim+
is an EV user so might make good use of the battery and soak up even the
summer output.

--
Robin
reply-to address is (intended to be) valid

Tim+ <tim.downie@gmail.com> wrote:
>
> Anyone here got solar? Just had a quote for a 7.5kW system with a 9.5kWh
> battery and a Givenergy 5kW hybrid inverter. G99 approval etc.
>
> We’ve been quoted £14,900. Is this out of order or not unreasonable?

Let's price up the hardware:

400w panel, £126:
https://midsummerwholesale.co.uk/buy/jinko/jinko-400-p-bw
Total for 7.5kWp 19 panels -> 126*9 = £1134

9.5kWh battery plus 5kW inverter, £5947.20
https://midsummerwholesale.co.uk/buy/giv-energy/givenergy-gen3-5000-9500-kit

Installation will depend on the location, but assuming a typical rooftop
install:

Scaffolding hire/putup/takedown £1k (cheaper if they have their own)

I CBA to price up all the rails and screws and stuff (which will depend on
the roof anyway), but let's say same cost as the panels: £1134

Isolators, wiring, switchgear etc, £300

No VAT applies

So our crumpled manilla comes out with hardware cost of:
1134+5947.20+1000+1134+300 = £9515.20

That leaves £5k for the labour, project risk, etc.

Labour will depend a lot on the install location. Likely two people
needed, assuming they will do both the roof install and the electrics
(although they could sub out the mains side of things).

If it took two people a week that would break down to £62.50 an hour.
Which is not an off the map rate for electricians, especially in a pricey
part of the country.

Theo

On Friday, July 21, 2023 at 9:33:47 AM UTC+1, Tim+ wrote:
> Anyone here got solar? Just had a quote for a 7.5kW system with a 9.5kWh
> battery and a Givenergy 5kW hybrid inverter. G99 approval etc.
>
> We’ve been quoted £14,900. Is this out of order or not unreasonable?
>
> Tim
>
> --
> Please don't feed the trolls

We had a 4.4kW solar panel and 13kWh battery installed end of July 2022. The hybrid inverter and batteries are Growatt. Our inverter is only 3kW which can be a bit limiting at times but we can live with it.

Our installation cost £12,500.

Alan

On 21 Jul 2023 11:48:34 GMT, Tim Streater <tim@streater.me.uk> wrote:

>On 21 Jul 2023 at 12:26:43 BST, "Chris Hogg" <me@privacy.net> wrote:
>
>> On Fri, 21 Jul 2023 10:53:26 +0100, alan_m <junk@admac.myzen.co.uk>
>> wrote:
>>
>>> On 21/07/2023 09:58, Tim+ wrote:
>>>> Pancho <Pancho.Jones@proton.me> wrote:
>>>>> On 21/07/2023 09:33, Tim+ wrote:
>>>>>>
>>>>>> Anyone here got solar? Just had a quote for a 7.5kW system with a 9.5kWh
>>>>>> battery and a Givenergy 5kW hybrid inverter. G99 approval etc.
>>>>>>
>>>>>> We?ve been quoted £14,900. Is this out of order or not unreasonable?
>
>>>>> Regardless of the quote, what are the economics of having this system?
>>>>
>>>> Estimated payback time of 7 years. Estimated savings of £52,000 over its
>>>> lifespan.
>
>I think we'd need to see how that figure was arrived at.
>
>>> https://www.moneysavingexpert.com/utilities/free-solar-panels/
>>>
>>> IMO the estimated savings of £52k seems very exaggerated.
>>>
>>> Most of what you generate will be during the summer when you possibly
>>> need it lest but to make the most of the savings you need to use all of
>>> what you produce rather than feed it back to the grid.
>>>
>>> In winter you may not be able to generate enough to, say, charge an EV
>>> and the battery. If you are also going to have electric central heating
>>> as well then you will be buying from the grid during the winter.
>>>
>>> You really need to ignore any figures on savings given by a salesman and
>>> do some sensible calculations yourself.
>>
>> Solar panel 'efficiency' (capacity factor) is about 5% of the
>> nameplate capacity in winter (short days, lots of cloud etc), rising
>> to about 25% in summer, and averaging somewhere around 10-15% across
>> the year. Much depends on type of panel, their orientation and their
>> latitude - the further north the worse they get. South of France and
>> North Africa are probably OK, but in northern Europe it's questionable
>> whether they ever generate enough electricity to cover the energy
>> required to make them (EROEI: energy returned on energy invested), but
>> it's a difficult calculation.
>>
>> Some real numbers here from a solar farm in the south of England.
>> Browse around it. https://tinyurl.com/q2993y9
>
>So are you saying that in winter the OP can expect to get a massive 375W and
>in summer 1.875kW ? Would that be average over some period, or peak at 12.00
>midday on some average day?

Those %ages have to be averages over several weeks or a month or
three, otherwise it wouldn't be effected nearly so much by the reduced
hours of daylight in the winter months. Whether an average of 375W is
'massive' compared to a maximum output of 7,500W, is subjective, but
it might come as a bit of a shock if someone is assuming they'd get
7,500W 24/7 in winter and do their costings on that basis.

"Solar PV panels have a capacity factor of around 10% in the UK
climate. In October 2022, home rooftop solar panels were estimated to
pay back their cost in ten to twenty years" from
https://en.wikipedia.org/wiki/Solar_power_in_the_United_Kingdom

ISTR that Harry used to get about 15% from his panels, and I had quite
a correspondence with him to get the right figures from him. He tended
to over-estimate his yields. Can't find it now.

Another site the OP might find useful, posted by a private individual
about their own system https://jaharrison.me.uk/Misc/Solar/index.html

--
Chris

Chris Hogg <me@privacy.net> wrote:
>
> "Solar PV panels have a capacity factor of around 10% in the UK
> climate. In October 2022, home rooftop solar panels were estimated to
> pay back their cost in ten to twenty years" from
> https://en.wikipedia.org/wiki/Solar_power_in_the_United_Kingdom
>
> ISTR that Harry used to get about 15% from his panels, and I had quite
> a correspondence with him to get the right figures from him. He tended
> to over-estimate his yields. Can't find it now.
>
> Another site the OP might find useful, posted by a private individual
> about their own system https://jaharrison.me.uk/Misc/Solar/index.html

There are some calculations on my solar garage example wiki page:
https://wiki.diyfaq.org.uk/index.php/Solar_PV_example:_single_garage

Specifically Global Solar Atlas:
https://globalsolaratlas.info/
will give you numbers for your site based on the prevailing conditions
(which includes things like cloud cover, not just latitude) including
monthly and time-of-day figures.

(this is not a system I've built to confirm the projections)

Theo

Theo <theom+news@chiark.greenend.org.uk> wrote:
> Tim+ <tim.downie@gmail.com> wrote:
>>
>> Anyone here got solar? Just had a quote for a 7.5kW system with a 9.5kWh
>> battery and a Givenergy 5kW hybrid inverter. G99 approval etc.
>>
>> We’ve been quoted £14,900. Is this out of order or not unreasonable?
>
> Let's price up the hardware:
>
> 400w panel, £126:
> https://midsummerwholesale.co.uk/buy/jinko/jinko-400-p-bw
> Total for 7.5kWp 19 panels -> 126*9 = £1134
>
> 9.5kWh battery plus 5kW inverter, £5947.20
> https://midsummerwholesale.co.uk/buy/giv-energy/givenergy-gen3-5000-9500-kit
>
> Installation will depend on the location, but assuming a typical rooftop
> install:
>
> Scaffolding hire/putup/takedown £1k (cheaper if they have their own)
>
> I CBA to price up all the rails and screws and stuff (which will depend on
> the roof anyway), but let's say same cost as the panels: £1134
>
> Isolators, wiring, switchgear etc, £300
>
> No VAT applies
>
> So our crumpled manilla comes out with hardware cost of:
> 1134+5947.20+1000+1134+300 = £9515.20
>
> That leaves £5k for the labour, project risk, etc.
>
> Labour will depend a lot on the install location. Likely two people
> needed, assuming they will do both the roof install and the electrics
> (although they could sub out the mains side of things).
>
> If it took two people a week that would break down to £62.50 an hour.
> Which is not an off the map rate for electricians, especially in a pricey
> part of the country.
>
> Theo
>

Many thanks to Theo and everyone else who actually tried to answer my
question rather than questioning the plan.

Of course I should be DIYing it but it’s a tad beyond my capabilities. ;-)

Tim

--
Please don't feed the trolls

On 21/07/2023 18:23, Tim+ wrote:
> Theo <theom+news@chiark.greenend.org.uk> wrote:
>> Tim+ <tim.downie@gmail.com> wrote:
>>>
>>> Anyone here got solar? Just had a quote for a 7.5kW system with a 9.5kWh
>>> battery and a Givenergy 5kW hybrid inverter. G99 approval etc.
>>>
>>> We’ve been quoted £14,900. Is this out of order or not unreasonable?
>>
>> Let's price up the hardware:
>>
>> 400w panel, £126:
>> https://midsummerwholesale.co.uk/buy/jinko/jinko-400-p-bw
>> Total for 7.5kWp 19 panels -> 126*9 = £1134
>>
>> 9.5kWh battery plus 5kW inverter, £5947.20
>> https://midsummerwholesale.co.uk/buy/giv-energy/givenergy-gen3-5000-9500-kit
>>
>> Installation will depend on the location, but assuming a typical rooftop
>> install:
>>
>> Scaffolding hire/putup/takedown £1k (cheaper if they have their own)
>>
>> I CBA to price up all the rails and screws and stuff (which will depend on
>> the roof anyway), but let's say same cost as the panels: £1134
>>
>> Isolators, wiring, switchgear etc, £300
>>
>> No VAT applies
>>
>> So our crumpled manilla comes out with hardware cost of:
>> 1134+5947.20+1000+1134+300 = £9515.20
>>
>> That leaves £5k for the labour, project risk, etc.
>>
>> Labour will depend a lot on the install location. Likely two people
>> needed, assuming they will do both the roof install and the electrics
>> (although they could sub out the mains side of things).
>>
>> If it took two people a week that would break down to £62.50 an hour.
>> Which is not an off the map rate for electricians, especially in a pricey
>> part of the country.
>>
>> Theo
>>
>
> Many thanks to Theo and everyone else who actually tried to answer my
> question rather than questioning the plan.
>
> Of course I should be DIYing it but it’s a tad beyond my capabilities. ;-)
>
> Tim
>

and if you DIY it, you don't get the MCS paperwork and therefore cannot
get the solar feed in tarriff or whatever its now called!

On 21/07/2023 09:33, Tim+ wrote:
>
> Anyone here got solar? Just had a quote for a 7.5kW system with a 9.5kWh
> battery and a Givenergy 5kW hybrid inverter. G99 approval etc.
>
> We’ve been quoted £14,900. Is this out of order or not unreasonable?

Battery and inverter are around £5k, panels are £200 or less each, what,
say 20, thats £4000 tops, ancillaries, like cables, isolators, CUs,
clamp meters etc wont be over £1k.
£5k ish sounds a lot for installation.

--
Remove the '+' and replace with 'plus' to reply by email

On 21/07/2023 18:35, SH wrote:

> and if you DIY it, you don't get the MCS paperwork and therefore cannot
> get the solar feed in tarriff or whatever its now called!

That's why you have nearly 10kwh of battery storage, no need to export
anything then. And, on the few occasions when you will be close to
export, you turn on the hot water, or put the washing machine on.

--
Remove the '+' and replace with 'plus' to reply by email

On 21/07/2023 14:50, Theo wrote:

>
> Let's price up the hardware:
>
> 400w panel, £126:
> https://midsummerwholesale.co.uk/buy/jinko/jinko-400-p-bw
> Total for 7.5kWp 19 panels -> 126*9 = £1134
>
> 9.5kWh battery plus 5kW inverter, £5947.20
> https://midsummerwholesale.co.uk/buy/giv-energy/givenergy-gen3-5000-9500-kit
>
> Installation will depend on the location, but assuming a typical rooftop
> install:
>
> Scaffolding hire/putup/takedown £1k (cheaper if they have their own)
>
> I CBA to price up all the rails and screws and stuff (which will depend on
> the roof anyway), but let's say same cost as the panels: £1134
>
> Isolators, wiring, switchgear etc, £300
>
> No VAT applies
>
> So our crumpled manilla comes out with hardware cost of:
> 1134+5947.20+1000+1134+300 = £9515.20
>
> That leaves £5k for the labour, project risk, etc.
>
> Labour will depend a lot on the install location. Likely two people
> needed, assuming they will do both the roof install and the electrics
> (although they could sub out the mains side of things).
>
> If it took two people a week that would break down to £62.50 an hour.
> Which is not an off the map rate for electricians, especially in a pricey
> part of the country.
>
> Theo

Good post Theo

In March my daughter had a similar installation with SE and SW facing
strings totaling 6kW installed power, 5kW hybrid inverter and 10.5kWh
(90% usable) LiPo battery, total cost £12k including a Zappi EV charger.
She still uses a combi for DHW. Budgetary constraints mean heat pumps
will have to wait.

Of the 2931kWh produced to date 1476kWh self use at £0.39 and 1454kWh
SEG at £0.15. She has bought in 103kWh in the period. This has covered
all her household use and EV charging. You could debate the £0.39/kWh
for the car charging as it could have been done offpeak, she hasn't
investigated those tariffs yet and won't till autumn.

As the money was sitting in an ISA at 1.4% the £794 income looks decent
and I never had the inclination to play with stocks and shares.

I wasn't there to watch the installation, scaffold erected 4 days before
roofer who worked on his own by fixing the framework then stacking the
13 panels upright at the bottom of the scaffold and hooking them with a
bit of rope, all completed in a day. Electrician turned up 4 days later
at midday and completed it by 11:00 next day.

Tim Streater wrote:

>So are you saying that in winter the OP can expect to get a massive 375W and
>in summer 1.875kW ? Would that be average over some period, or peak at 12.00
>midday on some average day?

My system is a smaller 3.64 kWp, and has been in operation since
2010. The FIT has long since paid for the system. The average
monthly kWh over that period is as below.

Jan 108
Feb 179
Mar 295
Apr 419
May 490
Jun 475
Jul 469
Aug 435
Sep 334
Oct 213
Nov 118
Dec 91

Total 3528

Chris
--
Chris J Dixon Nottingham UK
chris@cdixon.me.uk @ChrisJDixon1

Plant amazing Acers.

I think in this country this is a bit like overkill.
I mean if I lived in a sunny place I'd go for it, but a friend tells me
that their hot water heating panels were cheaper, no batteries and the
heating takes place on even cloudy days. If you could get more efficient
solar panels, then maybe, but how long till the pay back and how long would
these cells, battery and electronic last before needing to be replaced?
Brian

--

--:
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...
briang1@blueyonder.co.uk
Blind user, so no pictures please
Note this Signature is meaningless.!
"Pancho" <Pancho.Jones@proton.me> wrote in message
news:u9dgsf$36578$1@dont-email.me...
> On 21/07/2023 09:33, Tim+ wrote:
>>
>> Anyone here got solar? Just had a quote for a 7.5kW system with a 9.5kWh
>> battery and a Givenergy 5kW hybrid inverter. G99 approval etc.
>>
>> We've been quoted �14,900. Is this out of order or not unreasonable?
>>
>> Tim
>>
>
> Regardless of the quote, what are the economics of having this system?

Really, I somehow doubt that, too many variables.
Brian

--

--:
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...
briang1@blueyonder.co.uk
Blind user, so no pictures please
Note this Signature is meaningless.!
"Tim+" <tim.downie@gmail.com> wrote in message
news:1061138594.711622576.346761.tim.downie-gmail.com@news.individual.net...
> Pancho <Pancho.Jones@proton.me> wrote:
>> On 21/07/2023 09:33, Tim+ wrote:
>>>
>>> Anyone here got solar? Just had a quote for a 7.5kW system with a 9.5kWh
>>> battery and a Givenergy 5kW hybrid inverter. G99 approval etc.
>>>
>>> We've been quoted �14,900. Is this out of order or not unreasonable?
>>>
>>> Tim
>>>
>>
>> Regardless of the quote, what are the economics of having this system?
>>
>
> Estimated payback time of 7 years. Estimated savings of �52,000 over its
> lifespan.
>
> Tim
>
> --
> Please don't feed the trolls

On 22/07/2023 09:46, Chris J Dixon wrote:
> Tim Streater wrote:
>
>> So are you saying that in winter the OP can expect to get a massive 375W and
>> in summer 1.875kW ? Would that be average over some period, or peak at 12.00
>> midday on some average day?
>
> My system is a smaller 3.64 kWp, and has been in operation since
> 2010. The FIT has long since paid for the system. The average
> monthly kWh over that period is as below.
>
> Jan 108
> Feb 179
> Mar 295
> Apr 419
> May 490
> Jun 475
> Jul 469
> Aug 435
> Sep 334
> Oct 213
> Nov 118
> Dec 91
>
> Total 3528

At the current price of electricity, that's just under £1000. Double it
for Tim+'s larger quoted system and it does pay off the 14K (ignoring
interest) in 7 years.

On Sat, 22 Jul 2023 09:46:37 +0100, Chris J Dixon <chris@cdixon.me.uk>
wrote:

>Tim Streater wrote:
>
>>So are you saying that in winter the OP can expect to get a massive 375W and
>>in summer 1.875kW ? Would that be average over some period, or peak at 12.00
>>midday on some average day?
>
>My system is a smaller 3.64 kWp, and has been in operation since
>2010. The FIT has long since paid for the system. The average
>monthly kWh over that period is as below.
>
>Jan 108
>Feb 179
>Mar 295
>Apr 419
>May 490
>Jun 475
>Jul 469
>Aug 435
>Sep 334
>Oct 213
>Nov 118
>Dec 91
>
>Total 3528
>
>Chris

OOI, your December figure of 91 kWh works out at an efficiency
(capacity factor) of 3.4% (91*100)/(3.64*24*31). Over the three months
Dec Jan Feb it's 4.8%, very similar to the figure of 5% I gave earlier
for typical winter values in the UK.

--
Chris

On 22/07/2023 11:35, SteveW wrote:
> On 22/07/2023 09:46, Chris J Dixon wrote:
>> Tim Streater wrote:
>>
>>> So are you saying that in winter the OP can expect to get a massive
>>> 375W and
>>> in summer 1.875kW ? Would that be average over some period, or peak
>>> at 12.00
>>> midday on some average day?
>>
>> My system is a smaller 3.64 kWp, and has been in operation since
>> 2010. The FIT has long since paid for the system. The average
>> monthly kWh over that period is as below.
>>
>> Jan    108
>> Feb    179
>> Mar    295
>> Apr    419
>> May    490
>> Jun    475
>> Jul    469
>> Aug    435
>> Sep    334
>> Oct    213
>> Nov    118
>> Dec    91
>>
>> Total    3528
>
> At the current price of electricity, that's just under £1000. Double it
> for Tim+'s larger quoted system and it does pay off the 14K (ignoring
> interest) in 7 years.
>
OTOH how long can electricity prices stay at this 'let's finance
windmills' level?
I would expect new nuclear to at leats halve the cost of electricity by 2030

--
To ban Christmas, simply give turkeys the vote.

On Sat, 22 Jul 2023 12:27:49 +0100, The Natural Philosopher
<tnp@invalid.invalid> wrote:

>On 22/07/2023 11:35, SteveW wrote:
>> On 22/07/2023 09:46, Chris J Dixon wrote:
>>> Tim Streater wrote:
>>>
>>>> So are you saying that in winter the OP can expect to get a massive
>>>> 375W and
>>>> in summer 1.875kW ? Would that be average over some period, or peak
>>>> at 12.00
>>>> midday on some average day?
>>>
>>> My system is a smaller 3.64 kWp, and has been in operation since
>>> 2010. The FIT has long since paid for the system. The average
>>> monthly kWh over that period is as below.
>>>
>>> Jan    108
>>> Feb    179
>>> Mar    295
>>> Apr    419
>>> May    490
>>> Jun    475
>>> Jul    469
>>> Aug    435
>>> Sep    334
>>> Oct    213
>>> Nov    118
>>> Dec    91
>>>
>>> Total    3528
>>
>> At the current price of electricity, that's just under £1000. Double it
>> for Tim+'s larger quoted system and it does pay off the 14K (ignoring
>> interest) in 7 years.
>>
>OTOH how long can electricity prices stay at this 'let's finance
>windmills' level?
>I would expect new nuclear to at leats halve the cost of electricity by 2030

Looks like the chickens are beginning to come home...
https://www.bbc.co.uk/news/uk-england-norfolk-66263340

--
Chris