Our long awaited Tesla Powerwall (13.7kWh) arrived last Monday to be met with a relatively sunny week. Consequentially our typical winter daily consumption of 20kWh was only 50% from the grid for the week, we have a 6kW solar set up that faces SW and also a Solar iboost. Nothing went back to the grid at the measly 6.4p /kWh SEG.
Our historical average daily consumption drops 50% from March to Oct as we turn off our storage cooker that also partially heats the kitchen, so I am pretty confident we’ll be off grid for the majority of that period.
By my reckoning I should be near a 10year payback at current tariff levels, which are going to go up making payback shorter.
We waited 1 year for the Powerwall and at the start interest rates were near zero making this a no brainier investment, but as rates have come back up the financial gain is certainly diluted.
It’s quite a complex benefit model with lots of variables and if you throw an EV into the mix it gets even more complex, even so I’m happy with the investment.
