Tesla Powerwall 2

ChopperST wrote: »

Hi everyone,

Has anyone run the numbers now the pricing is out for the Powerwall 2 as to whether it makes sense in the UK?

Hiya Chopper, there's lots of chatting about home batts on this thread, but in short, the PWII will cost around £6.5k installed, so divided by useable capacity and warranted cycles, it's gonna cost approx 10p/kWh (£6,500 / (5,000 x 13.5)).

So, if you have lots of export, and lots of import at more than 10p, then it starts to breakeven, but in reality the export is worth 3.5-5p/kWh too, if metered, plus lost interest on capital etc etc.

If you don't import anything like the PWII capacity each day, or export enough to displace the import, then the numbers get harder to justify, and a smaller batt may be better, but will probably cost more proportionately.

So not too simple yet to work out, and you may want to wait a while and see how prices go. Also need some indication of actual life expectancy rather than just guesses at the moment.

Hiya Chopper, there are lots of battery systems, most much smaller than the PWII, and many modular so you cab add more later on.

For example there's the Enphase systems which are only 1.2kWh and about 350W charge/discharge.

So if the prices fall far enough for the smaller systems it might well be a good idea to buy then. I'm clearly quite passionate about batts and their future, but the time isn't right yet unless you generate and import a ton of leccy still, but we'll get there. Australia is leading the charge as they have great generation, but also very high import prices, so the industry is developing, but it's probably where PV was 5yrs ago, so patience is needed in the UK. Drat!

All the best.

Martyn1981 wrote: »

Hiya Chopper, there are lots of battery systems, most much smaller than the PWII, and many modular so you cab add more later on.

For example there's the Enphase systems which are only 1.2kWh and about 350W charge/discharge.

So if the prices fall far enough for the smaller systems it might well be a good idea to buy then. I'm clearly quite passionate about batts and their future, but the time isn't right yet unless you generate and import a ton of leccy still, but we'll get there. Australia is leading the charge as they have great generation, but also very high import prices, so the industry is developing, but it's probably where PV was 5yrs ago, so patience is needed in the UK. Drat!

All the best.

OK Mart you can see that I am able to generate a lot of eleccy, but still appear to be consuming a lot also, say £30 a month, is this close to making a battery viable for me yet?