Help with solar quotes please!!

Apologies I know there’s a lot of posts on here already (which I have been reading) but I really would appreciate feedback on prices and kit from those who have much more knowledge than me as it’s a minefield. I hope in turn this helps someone out 😀

Firstly, are panels generally worth it? Same with batteries… we use 3199 kWh a year, estimated. 

Quote 1 
10 x Jinko 380w solar panels 
SofarSolar 3-6kW single phase inverter 
SofarSolar amastore battery GTX 3000 5.1kWh 

£5039 without battery 
£7887 with battery 

Quote 2 
10 x JA 390w solar panels 
solaredge inverter 3000w single phase 
£8,300

Solaredge battery 10kWH £10,054 

Quote 3 
7 x “Tier 1” 390w solar panel 
solaredge wave inverter 
GivEnergy AC-coupled inverter with 5.2 kWh battery (5.2 kWh usable)

£11,237

Quote 4 
10 x 390w Trina Panel
Solaredge wave inverter

OR

Growatt hybrid inverter with 6.5 kWh battery 

£7025 without battery 
£11545 with battery 

Thank you!!!!
«1

Comments

  • Spies
    Spies Posts: 1,949
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    Quote 1 sounds pretty decent to me, when is most of your electricity usage? During daylight hours or is the house empty during that time?
    4.29kWp Solar system, 45/55 South/West split in cloudy rainy Cumbria. 
  • polar0l
    polar0l Posts: 7
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    Thanks spies. I agree, that’s the solar together reverse auction thing, just not heard of those brands (doesn’t mean much though!). 

    2 people working from home 50% of the time I’d say and then the usual cooking/tv in the evening. 
  • Spies
    Spies Posts: 1,949
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    edited 1 June 2022 at 7:29PM
    I don't think solar together are rated very highly on here, I believe some Installs have never been finished for a couple of people on here. 
    4.29kWp Solar system, 45/55 South/West split in cloudy rainy Cumbria. 
  • arty688
    arty688 Posts: 411
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    Another question is do intend to get an EV , which I guess you haven’t ATM due to usage.

    8kw system spread over 6 roofs , surrounded by trees and in a valley.
  • polar0l
    polar0l Posts: 7
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    No plans at the moment @arty688 - not due to replace a car for a bit. Is it easy to add more panels in a few years time? 
  • arty688
    arty688 Posts: 411
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    It’s the battery economics that improves as more tariffs are open to you.
    basically ATM if you covered your whole annual usage how much would you save ? 

    Optimistic 
    Then with batteries you will maybe cover 80%

    without 40%

    So work out the savings.

    The above figures could be complete nonsense BTW and who knows where prices will be in 2 years time could be half what they are now.
    8kw system spread over 6 roofs , surrounded by trees and in a valley.
  • polar0l
    polar0l Posts: 7
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    arty688 said:
    It’s the battery economics that improves as more tariffs are open to you.
    basically ATM if you covered your whole annual usage how much would you save ? 

    Optimistic 
    Then with batteries you will maybe cover 80%

    without 40%

    So work out the savings.

    The above figures could be complete nonsense BTW and who knows where prices will be in 2 years time could be half what they are now.
    Not a bad way of estimating though - good shout. We use about £1.75-£2 a day. 

    So 40% of £2 x 365 = £292 potential saving a year and 17 years to break even without a battery. 

    The same at 80% with a battery is 13.5 years to break even. 

    Do you mean the octopus go / agile tarrifs? 
  • polar0l
    polar0l Posts: 7
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    The proposed 45% price rise in autumn would bring that to 12 years and 9 years respectively. At that price it all seems quite convincing but as you say who knows what will happen. 
  • QrizB
    QrizB Posts: 13,634
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    polar0l said:
    Do you mean the octopus go / agile tarrifs? 
    Time-of-use tariffs in general, of which Go is an (extreme) example.
    Even boring old Economy 7 offers arbitrage options to someone with a home battery, and charging for seven hours at 1/7 C is kinder to your battery than charging for four hours at 1/4C is.
    Last August I was seriously considering Green Energy Tide (who were then offering 7 hrs at 7.5p, link) and/or Logicor Advanced (7 hrs at 11.76p, link). I got as far as signing up with Logicor but they lost my application and by then Green had increased their prices significantly (link) so I went with Octopus instead.
    All these tariffs become more attractive if you have a battery and can buy your peak electricity at off-peak prices.
    ------
    FYI Tide is currently in the "boutique" price range as you would expect from one of the three uncapped "deep green" suppliers. 24p/kWh overnight and 70p/kWh in the evening peak:

    N. Hampshire, he/him. Octopus Go elec & Tracker gas / Shell BB / Lyca mobi. Ripple Kirk Hill member.
    2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 3.6kw inverter. 30MWh generated, long-term average 2.6 Os.
    Ofgem cap table, Ofgem cap explainer. Economy 7 cap explainer. Gas vs E7 vs peak elec heating costs.
  • polar0l
    polar0l Posts: 7
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    QrizB said:
    polar0l said:
    Do you mean the octopus go / agile tarrifs? 
    Time-of-use tariffs in general, of which Go is an (extreme) example.
    Even boring old Economy 7 offers arbitrage options to someone with a home battery, and charging for seven hours at 1/7 C is kinder to your battery than charging for four hours at 1/4C is.
    Last August I was seriously considering Green Energy Tide (who were then offering 7 hrs at 7.5p, link) and/or Logicor Advanced (7 hrs at 11.76p, link). I got as far as signing up with Logicor but they lost my application and by then Green had increased their prices significantly (link) so I went with Octopus instead.
    All these tariffs become more attractive if you have a battery and can buy your peak electricity at off-peak prices.
    ------
    FYI Tide is currently in the "boutique" price range as you would expect from one of the three uncapped "deep green" suppliers. 24p/kWh overnight and 70p/kWh in the evening peak:

    Ah good old economy 7! 

    Thanks, very useful! With batteries I get that you’d probably want it fully charged overnight in winter when the solar panels aren’t able to generate as much. At this time of year are the panels able to give a good amount of charge or would you still fully charge your battery overnight? 

    I think what I’m asking is the battery more useful for cheap overnight charging than charging via the solar panels? 
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