Not bad for a guess

Quote from: RE on Jul 06, 2023, 07:54 PM

Quote from: RE on Jul 06, 2023, 02:31 PM

Quote from: Nearings Fault on Jul 06, 2023, 01:57 PM

Quote from: RE on Jul 06, 2023, 11:11 AMHow long does it take your 2kw array to charge your EV, and how do you run your house while the car is chatging?

RE

as I'm sure you realize that is not a system for an electric car household.

Understood.  The question is, how big an array do you need to BOTH power a house and charge an EV?  That is what is necessary for the model being promoted here of using EV Batts as part of the total power storage system for the grid and to convert the current fleet of ICE vehicles to EVs.  Every suburban house would need an EV also to maintain the suburban living model.

RE

OK, answering my own question.

According to Google charging a Tesla off a standard 120V home outlet takes 20-40 hours.  Let's split the difference and call it avg 30 hours.  A standard circuit is 20 amps for 2400 watts. How many hours/day do you get enough sunlight to generate 2400 watts?  On a good sunny day 5?  So call it 6 days to charge up with a 2.4 kw solar array, during which time said electricity is not available to run the house or charge the home batt.  Obviously you need a substantially larger solar PV array to handle this task.

To bring it within reason, you probably have to increase your array size by a factor of 10 to generate 24 kw. You'll need 10X the number of panels and  wiring and inverters capable of handling the load.  So if your basic 2400 kw array cost $10K, an array for the Tesla costs $100K, plus of course you still need the original array to power the house.

This setup charges the Tesla in 3 hours, reasonable as long as you are charging it during the hours the sun is shining.  If not, you would need a 2nd batt pack to charge while you are driving.

Since your array is so much larger, you need substantially more property on which to drop it, increasing the cost of your McMansion and your annual property taxes.

All in all, I would say $100K for the setup is an underestimate, and that's just to buy it.  It doesn't include the annual property tax bill, insurance or maintenance.

Then there is the cost of the Tesla itself, burrently around $30K for the cheapest ones I think.  More than 1 car needed, multiply those cost again for a still larger array, unless you can be charging one car while the other is driving.

Now of course as long as you don't completely drain the batt every day and only need to partially charge it, you can get away with a smaller setup.  Also, as long as there is a commercial charging station nearby you would not need to fully charge at home.  However, commercial charging stations would require a grid connection, which brings us back round to needing to upgrade the grid to carry higher loads out to the boonies.

Cloudy days also a problem.  lol.

RE

. Not bad for a guess but your numbers are way off. The level 1 charger on a Tesla is roughly 1200 watts or 4 to 5 miles per hour. You would not use a level one charger on solar with a large array you would use a level 2 at 30 amps at 240 volts for roughly 25 to 30 miles of charge per hour. If I was designing it I would do a 3kw array feeding to the grid for an electric car driving roughly 10000 miles a year. If the were off grid I would want to boost the array size to 5000 watts just for the car portion. I end up charging about 3 dollars Canadian per watt so roughly 15000 for the array required to run the car