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PV and battery long payback - sense check query

 
Energy Storage
Last Post by DavidB 1 hour ago
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 DavidB
(@davidb)
Trusted Member Member
Joined: 6 months ago
Posts: 62
Topic starter 05/08/2026 8:59 am   [#3126]

Our second car died last week and has been replaced with a 2015 Leaf.  As part of the planning I have been investigating using time of use tarrifs, PV and battery storage.  I now have a full proposal from an installer which suggests a payback of 15 years!  Initially I suspected this was based on the PV output only but was assured it included using the 9.6kW battery benefits.  While I can ask to fine tune the numbers, 15 years to show a theoretical profit suggests I just pack the idea away and continue to use my standard tarrif.  My reason for raising the topic is to seek the guidance of this very experienced community to sense check if that is a reasonable conclusion?

Some numbers may help

Annual usage of about 6000kWhrs including a small added allowance for the EV.

Peak daily usage of roughly 30kWhrs but that figure varies significantly but is in the region of 15kWhrs during the winter.  Our meter only went smart in late February.

The proposal is for 8 PV panels (4 west facing and 4 east), 10kW battery and 3.6 inverter.  The EV will be charged using a dedicated 13amp socket and the vehicle systems used to control charging etc. The suggestion is an Octopus tarrif from Oct 25 of 7p for 6 hrs and 30p.

Have I got something significantly wrong?



   
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