Is it still worth exporting your home battery?

[mick D]

I’m with OVO also solar fitted by OVO if you use another installer the Seg price is 15 p

 

[JWD]

Re battery “degradation” / getting older - below is some data from our 3x Powerwall 2s of different ages. Over the last year we have been pursuing an approach that involves charging to 100% overnight on IOG, exporting solar from when the battery refills after 05:30 onwards and then actively discharging to grid in the evenings down as low as possible ( now automated) whilst not incurring peak rate usage before 23:30 arrives.
Relative to the battery remaining capacity (SoH) as it was on 1/4/2025, our 3 PW2s now have reduced capacities by 4.9% (7 years old and now at 87.5% of nominal capacity of 13.5kWh), 5.2% (a warranty replacement 1yr ago which started at 100%) and 6.5% (a new PW2 installed 10/24 and now at 101%). Rightly or wrongly I’m maxing the use of the capacity without regard for the battery longevity and with the expectation that at some point newer battery tech with lower pricing will justify replacing some or all of the Powerwalls.
Of course as and when import / export tariff rates and Ts and Cs change in the future we may well modify this pattern of use as we did before moving to SEG and IOG sometime in 2024 I think.