If you are on TOU, you pretty much always need a high percentage off-peak to save money.
To make it work the on-peak pricing has to be quite punitive. Also, don't expect to save much.
If x is fraction off-peak then break-even is
0.113=(1-x)*0.27+x*0.073
x ~= 0.797
So you need to be 79.7% off peak to break even on TOU.
How easy that would be would depend:
- what's your normal usage?
- could you shift any heavy electrical loads like HVAC, laundry and dishwashing off-peak?
- would weekends be off-peak?
- would holidays off-peak?
- how many miles would you be charging your Model 3 at home?
- would there be any additional monthly service charge to be on this plan?
If it's _only_ 4pm-8pm weekdays peak that sounds like a decent deal and you could get a pretty high percentage if your household wouldn't be electrically busy during that period.
We have 7am-12pm and 4pm-8pm at peak price.
We have a Volt and our garage average (which is almost all the Volt) is 219.25kWh/month.
Home average over past 12 months 453.5kWh/month.
Heat is oil (still...).
Not much A/C use here: window units; normally limited to a couple of months per year - not even in yet.
Laundry and cooking electric.
No luxurious wasters like a heated pool or hot tub.
Laundry and dishwasher (almost) always done off-peak.
Over the past year we've averaged 85% off peak, with shifting of electricity. (Actually 79.5% off-peak and 5.5% 12pm-4pm shoulder, but on our tariff the shoulder is charged at the lower rate).
One thing to consider about that high peak cost on TOU: solar on an unshaded west-facing roof would be more valuable.