I have an idea I wish to run by the group. I am on the Agile Octopus with SolarPV but have no immersion hot water diverter. I was thinking about purchasing a diverter, but then had another thought. What about using Agile to achieve the same net goal?
At the end of each day I know how many kWh I have sent to the grid and been paid 5.5p per kWh. During the night time at about 3am, the octopus agile import tariff will be at it’s cheapest on average, for sake of example the cost is 5.5p.
If I exported all my surplus solar during the day time, and then purchased the (approx) equivalent back again during the night time to heat my hot water, surely from a pure financial point of view it has achieved more-or-less the same thing as a physical diverter? net-zero import/export of solar.
Of course there is variability in the Agile pricing. However per this website https://www.energy-stats.uk/octopus-agile-london/ the average night time price at 3.30am for London has been 4.44p! Cheaper still!
Is there a flaw in my logic?
This predicates being able to turn on & off the immersion heater with a crude timer or more surgically with a computer.