Not on tracker but making use of E7, seem to be shifting about 80% of my grid usage into the 7 hour off peak window:
431 kWh @ 14.79p
114 kWh @ 31.71p
average of 18.34p per hWh which is similar to tracker I suppose but you don't need to fork out a fair sum to get use of tracker but suppose batteries give you a bit more of a guarantee paired with an E7 tariff.
Total of basically £100 for the month for electric, could probably get decent value from another 3.5 kWh battery, think that would almost put me 100% into the E7 usage. As my solar basically produces next to nothing in Nov/Dec and Jan I think the numbers add up but might wait as battery prices have dropped a lot in the last 12 months so may see if they drop further as the technology improves as my current battery setup will pa
How is tracker looking at the moment with a lack of green energy (onshore at least) the last few days?