Would it not make almost as much sense to look at a PowerWall for all the trouble of having to work out when/how to charge on direct solar PV?
My issue with PowerWall for car charging is the losses
electricity->PowerWall->electricity
->Car ... I haven't done the sums carefully but my guess is I might as well just buy Grid Juice
given the over-capacity of PV I would need just to cover those losses.
Maybe I just need to "get over" that ?
Powerwall does not make financial sense if you have to pay for it.
Too much store put by for payback IMHO. Lots of work to do to save the planet. Clearly folk here are already doing plenty - either got, waiting for, or wanting an EV ... and in this thread also have PV.
I forget the exact headline but I think something like needing to reduce emissions by 80% - those of us that can clearly need to do more than those that can't in order to achieve that.
The EU objectives are:
Key targets for 2030:
- At least 40% cuts in greenhouse gas emissions (from 1990 levels)
- At least 32% share for renewable energy
- At least 32.5% improvement in energy efficiency
And UK:
The UK is committed to reducing its greenhouse gas emissions by at least 80% by 2050, relative to 1990 levels
2050 Pathways
My house used way more energy in 1990 than it does now ... but I wasn't the owner and previous owner had money to burn, and kept the multiple oil boilers on throughout the year
But that was then ...
I consider that my family are well ahead of the curve - EVs, Biomass boiler, Solar Thermal and PV, Passive House. Nonetheless my family has set about reducing to "Net zero". Too early for me to say how difficult that will be, but I'm not resting that I am already doing better than my peers; payback is most definitely not on my priority list. And before you say it: No, I don't have ...
I know Tesla owners might all be in the more-money-than-sense bracket,
... more-money-than-sense
Tempted to switch - will these tariffs last?
I think the most likely scenario is that Solar PV will give us spare juice in the day, more so in Summer (at our Latitude of course, but Wind is greater in Winter, so maybe "all year" daytime peak. So lowest tariff will become Day Renewals Peak. Many cars will be "parked at work" so will need employers to provide chargers - and then you can export the PV from your roof to grid and Employer can buy it back ... and probably sell it to you
If you have another EV at home then I think that might look rosy for day time charging - either from your own PV or from Peak-Renewals cheap tariff.
I just this week completed an upgrade of my existing PV system to 12K.
We are looking at increasing our PV panels from 8 to 25-ish. I don't think that one Powerwall will be enough to smooth that out (even if DNO allows the export without curtailment, which they might, I'd prefer to use-what-I-make), but an always-at-home additional EV is an attractive proposition. We have two cars, an EV and the other still ICE for long journeys "too difficult" for MS 90 ... but a new MS LR would solve those journeys, so could then change ICE to M3 ... and could then alternate commute-vehicle and day-charge the other one ... thereby not needing 2nd PowerWall and moving the £7,500 to purchase of M3.
The details would not help you since ...
Plus your sunshine is WAY better than ours