in reply to Nae King! Nae quin! Nae Laird!

Answer:
If you normally need about 12 kWh per day, then the £1000 upgrade will pay for itself in about 1 year and 3–4 months.

⚠️ But if you always use the full 6 hours at 7 kW (42 kWh), then you don’t actually save money—you just use more energy at nearly the same cost.


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Do you usually charge your car fully for 6 hours every day, or just enough to get ~12 kWh? That changes whether this investment pays off.

in reply to Nae King! Nae quin! Nae Laird!

If you charge about 7.5 kWh per day, then switching from £0.25 /kWh to £0.07 /kWh saves you £1.35 per day.
That means your £1000 investment would pay back in about 741 days (≈ 2 years).
After that, you’ll save roughly £500 per year on charging costs.