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is a home battery without an EV worth it?

 
Energy Storage
Last Post by Judith 8 minutes ago
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 AdamK
(@adamk)
Reputable Member Member
Joined: 6 months ago
Posts: 93
Topic starter 30/08/2025 12:52 am  
is a PW3 at £7.5k worth it if i dont own an EV? but have 3.68kw limited 4kwp solar, a 7kw heat pump (3.5kw max electrical), induction hob etc.
 
its a bit difficult to gauge the heat pump use as havent done a winter yet, but estimate about 2500kwh per year and house less the induction hob as again only just fitted that was 2500kwh. so about 5mwh per year. if i drop Octopus and go with OVO to get 15p kwh for the heat pump its looking like a yearly bill around £900. if i do the same calcs on Octopus Cosy with a battery and the 12.29p kwh i save about £400 per year.
 
unless ive missed something having storage on rates above about 10p kwh doesnt seem to work.

   
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 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 2 years ago
Posts: 2747
30/08/2025 7:22 am  

I do have an EV and did the maths using eon next drive (7 hrs at 6.5p) and my measured consumption form my heat pump. 

I couldn't get the business case to work either, even if I played arbitrage games in summer by importing at 6.5p to charge the batteries at night and exporting at 16.5 p during the day to discharge them.

I don't think the EV affected the case as it happens, it's 100pc charged at night anyway.

For me battery prices need to come down by 20% or more for them to be viable

If my 13yr old solar inverter fails, and thus I have to buy a new inverter anyway, it might just work then.

Others do claim to have a business case, even though I (and it seems you) appear not to.

This post was modified 1 hour ago by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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 Judith
(@judith)
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Joined: 2 years ago
Posts: 379
30/08/2025 8:26 am  

@adamk will OVO accept you? Several months ago the initial “trial” closed to new entrants. And of course it is limited to make of ashp. Our Vaillant did but not all makes do.

2kW + Growatt & 4kW +Sunnyboy PV on south-facing roof Solar thermal. 9.5kWh Givenergy battery with AC3. MVHR. Vaillant 7kW ASHP (very pleased with it) open system operating on WC


   
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