1. Model 3 is coming. Get your Model 3 Owners Club apparel today!


    Dismiss Notice

How many solar panels do you need to charge an EV?

Discussion in 'US' started by patrick0101, Apr 10, 2016.

Tags:
More threads by patrick0101
  1. patrick0101

    Active Member
    Expand Collapse

    Joined:
    Apr 4, 2016
    Messages:
    32
    Likes Received:
    14
    Trophy Points:
    8
    City & State/Province:
    USA
    Tesla Owner:
    Model X
    Country:
    Country
    To power your EV's energy needs, it depends on what EV you drive, how far, where and how you drive it.
    For energy production, it depends on where you are putting the solar panels, angle, azimuth, tilt, shading, and regional weather... There are variables, but with a few tools, you can figure it out.

    [​IMG]

    If you want a rule-of-thumb, here's one:
    Each 1kW of panels will get you about 4 thousand miles of EV driving.

    Will this be accurate for your home and your Model 3? Nope, it's just a rule of thumb. If you want to get more precise numbers, here's a link that can give you the tools to plug in your car (after it's EPA rated) and your address to get solar energy data for your roof.
     
    • Like Like x 1
  2. DeimosEV

    New Member
    Expand Collapse

    Joined:
    Apr 20, 2016
    Messages:
    2
    Likes Received:
    0
    Trophy Points:
    1
    Gender:
    Male
    City & State/Province:
    Nashua, NH
    I depends of which EV you have, but I have 12 panels and Its more than enough for my i3.
     
  3. AEDennis

    Top-Contributor
    Expand Collapse

    Joined:
    Apr 10, 2016
    Messages:
    709
    Likes Received:
    384
    Trophy Points:
    63
    City & State/Province:
    Southern California, Most of the time...
    Country:
    Country
    I have 28 panels on the roof. We have 2 EVs, and the panels generate 6.58 kW STC DC using Sharp panels and Enphase Inverters.

    The panels are for the whole house use, so sometimes it's powering the drive, but it's also powering the rest of the household.
     
    • Like Like x 2
  4. teslaliving

    Top-Contributor
    Expand Collapse

    Joined:
    Apr 2, 2016
    Messages:
    502
    Likes Received:
    212
    Trophy Points:
    43
    Gender:
    Male
    City & State/Province:
    Boston
    Tesla Owner:
    Model S
    Country:
    Country
    I have 69 panels which is about 3x what I need for the Model S depending on the day
     
    • Like Like x 3
  5. jim stack

    Member
    Expand Collapse

    Joined:
    Apr 20, 2016
    Messages:
    17
    Likes Received:
    4
    Trophy Points:
    3
    Gender:
    Male
    City & State/Province:
    chandler
    I just have a 4 kW GRID tied system It runs my home and 2 100% Electrics. I normally make 110% of what we use. Last month March I made 506%. My home is very efficient. I use passive and active solar, CREE USA made LED light, 3 Solar SunOvens and ride my bicycle a lot. We live in Super Sunny Chandler Arizona. I added radiant barrier in the attic, more insulation, Solar screens outside and In'Flectors inside all windows.
    I have a Tesla 3 on order but will ECO drive it for 300+ miles on a charge. A lot depends on how fast and far you drive. I love 15 mph school zones, I'm the only one doing 14 mph.
     
    • Like Like x 4
  6. Topher

    Energy Curmudgeon
    Expand Collapse

    Joined:
    May 11, 2016
    Messages:
    570
    Likes Received:
    195
    Trophy Points:
    43
    City & State/Province:
    Maine
    Tesla Owner:
    Reservation
    Country:
    Country
    Find out the number of 'sun-hours' you get (Google insolation map). Divide that into the number of miles you TYPICALLY drive in a day (ignore long trips). Adjust that by multiplying by a factor of the Watt-hr/mile of your car divided by Watt rating on the panel.

    20 miles on a typical day / 5 sun-hours / day * (300 Wh/mile car / 300 W/panel ) = 4 panels

    Adjust that to compensate for various efficiency losses (say 150%) = 6 panels.

    Thank you kindly.
     
    • Like Like x 1

Share This Page

Model 3 Owners Club © 2017. All rights reserved.
Model 3 Owners Club (M3OC) is an enthusiast club and is not affiliated with Tesla Motors or the Tesla Motors Club Forum (TMC).
All Tesla logos are trademarks or registered trademarks of Tesla Motors.