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Plug-in solar in South West London (SW postcodes)

In South West London a two-panel plug-in kit in a sunny, south-facing garden spot makes about 921 kWh a year – 6% more than the middle of England. With someone home part of the day that's worth about £132 a year at 26.32p/kWh.

WherePer yearSaving
Garden (ground frame), south921 kWh£132
Balcony railing, south782 kWh£122
House wall, south678 kWh£112
House wall, east471 kWh£88
House wall, west455 kWh£86
Flat roof, south831 kWh£123

Month by month

Jan: 36 kWh madeJan: 23 kWh used at homeJanFeb: 48 kWh madeFeb: 29 kWh used at homeFebMar: 78 kWh madeMar: 42 kWh used at homeMarApr: 104 kWh madeApr: 51 kWh used at homeAprMay: 109 kWh madeMay: 58 kWh used at homeMayJun: 111 kWh madeJun: 59 kWh used at homeJunJul: 112 kWh madeJul: 59 kWh used at homeJulAug: 100 kWh madeAug: 53 kWh used at homeAugSep: 86 kWh madeSep: 45 kWh used at homeSepOct: 62 kWh madeOct: 35 kWh used at homeOctNov: 43 kWh madeNov: 26 kWh used at homeNovDec: 33 kWh madeDec: 22 kWh used at homeDec

made used at home

Fastest payback here: DMEGC 950W Hoymiles HiFlow kit at £456 – about 3.4 yrs.

Solar data: PVGIS (EU Joint Research Centre) for the centre of the SW postcode area, 14% system losses. 920W kit, 800W inverter.

What would a kit save you?

No postcode – using the UK average (Birmingham).
Where would the panels go?
Which way do they face?
Use a phone compass, standing with your back to the wall or rail.
Shade during the day
Who's home in the daytime?
Solar only saves money when it powers something as it's made.
Space for
Your electricity price
Default: Ofgem price cap average, 1 Oct – 31 Dec 2026.
Only Octopus pays for plug-in export so far, and only on kits bought from them.
£133 a yearestimated saving
3.4 yrspayback
937 kWhmade per year
507 kWh (54%)used in your home

Based on the DMEGC 950W Hoymiles HiFlow kit (£456), the fastest payback for this spot.

Jan: 37 kWh madeJan: 24 kWh used at homeJanFeb: 48 kWh madeFeb: 29 kWh used at homeFebMar: 80 kWh madeMar: 43 kWh used at homeMarApr: 105 kWh madeApr: 52 kWh used at homeAprMay: 111 kWh madeMay: 58 kWh used at homeMayJun: 113 kWh madeJun: 59 kWh used at homeJunJul: 114 kWh madeJul: 60 kWh used at homeJulAug: 101 kWh madeAug: 53 kWh used at homeAugSep: 88 kWh madeSep: 45 kWh used at homeSepOct: 63 kWh madeOct: 36 kWh used at homeOctNov: 44 kWh madeNov: 27 kWh used at homeNovDec: 33 kWh madeDec: 22 kWh used at homeDec

made used at home (the part that saves money)

Best kits for this spot

Fastest payback

DMEGC 950W Hoymiles HiFlow kit

£456 at City Plumbing · saves about £133/yr · pays back in 3.4 yrs

See deal at City Plumbing
Runner-up

DMEGC 1050W Hoymiles HiFlow kit

£480 at City Plumbing · saves about £137/yr · pays back in 3.5 yrs

See deal at City Plumbing
Also good

JA Solar 800W balcony & garden kit (2 × 465W)

£470.95 at Voltacon Solar · saves about £133/yr · pays back in 3.5 yrs

See deal at Voltacon Solar