Results 1 to 10 of 10

Thread: Charging on an extension cord

  1. #1
    Model S R231 EU widodh's Avatar
    Join Date
    Jan 2011
    Location
    Middelburg, The Netherlands
    Posts
    3,671

    Charging on an extension cord

    Tesla does not advise you to charge with an extension cord, but I knew I was going to a location where charging wasn't possible without one (20 meters), so I took one with me.

    Normal extension cords here a 3G1.5, that means 3 wires of 1.5mm2 each. But I had a 25m 3G2.5 with me and that works great.

    I'm currently charging on 13A over a total of 25m of extension cord, no problems.

    All the wiring here in houses and buildings is 2.5mm2 by default, so it's not a real wonder that it works, but I thought I'd share it.

    I however did notice a drop in voltage from 236V on idle to 218V during charging. That was more then I calculated.

    I'd advice everybody to always have a 2.5mm2 extension cord with you instead of a 1.5mm2 to avoid the "extension cord" message from the Roadster. This message is mainly due to a high voltage drop when putting load on the wires.
    BMW M5 E39 - Kawasaki Z750R - 3-phase power - Not a Roadster owner, but the co-owner of my/our company is

    85kWh - 19" Cyclone grey - Pearl White - Tech Package - PDC - Sunroof - Twin-Chargers - Light package - Nappa Leather

  2. #2
    Roadster 919, S 2006 Doug_G's Avatar
    Join Date
    Apr 2010
    Location
    Ottawa, Canada
    Posts
    12,544
    Blog Entries
    1
    I've charged with an extension cord on a couple of occasions (at hotels). As long as it's heavy-duty gauge wire it works just fine.
    Roadster #919, Model S #2006. Blog The Rules of Model S Road Tripping
    Moderator: Tesla Motors , Electric Vehicles, Media, Roadster,
    Canada, EVents and Off Topic sub-forums.

  3. #3
    Model S R77 efusco's Avatar
    Join Date
    Mar 2009
    Location
    Nixa, Missouri, United States
    Posts
    2,932
    Blog Entries
    1
    I'll put a heavy gauge extension on my accessories list...had wondered about that.
    Evan E. Fusco, MD--Nixa, MO
    Model S R77/VIN-1267-- Black 85kWh (non-perf), Tech, Lacewood trim, tan interior, Sound Studio, Air Suspension, 19" rims, twin chargers, HPWC
    Model X Reservation Sequence # 5966 (for the wife)

  4. #4
    Senior Member smorgasbord's Avatar
    Join Date
    Jun 2011
    Location
    SF Bay Area
    Posts
    2,238
    Quote Originally Posted by Doug_G View Post
    I've charged with an extension cord on a couple of occasions (at hotels). As long as it's heavy-duty gauge wire it works just fine.
    Another tip for Roadster owners is to use something like OVMS to set the amperage draw down an amp or two. What I've done is to start charging, then after an hour, bump the amperage up 1 amp. Then wait another hour and bump again. OVMS lets you do that remotely.

  5. #5
    Driving on Sunshine Timothy's Avatar
    Join Date
    May 2011
    Location
    Santa Barbara, CA
    Posts
    212
    Quote Originally Posted by smorgasbord View Post
    Another tip for Roadster owners is to use something like OVMS to set the amperage draw down an amp or two. What I've done is to start charging, then after an hour, bump the amperage up 1 amp. Then wait another hour and bump again. OVMS lets you do that remotely.
    So is that where the term 'amped up' comes from?

  6. #6
    Senior Member
    Join Date
    Jul 2010
    Location
    Bradford on Avon, UK
    Posts
    1,761
    I carry a 10M extension cable and have charged at 32A overnight with no problems. The cable I use has 6mm cores and is both light weight and flexible. Here's my European travel kit

    Name:  IMG_1706.jpg
Views: 1399
Size:  3.06 MB

  7. #7
    Model S R231 EU widodh's Avatar
    Join Date
    Jan 2011
    Location
    Middelburg, The Netherlands
    Posts
    3,671
    I'm carrying about the same, but since 32A points here are rare I only carry 16A stuff. The Type 2 -> Tesla cable is 32A capable though since we have some 32A EVSE's out there.

    I'd just advise everybody who is thinking about this to take a thick cable, that prevents the voltage drop. When the voltage drops below a certain amount (region specific) the Roadster refuses to charge.
    BMW M5 E39 - Kawasaki Z750R - 3-phase power - Not a Roadster owner, but the co-owner of my/our company is

    85kWh - 19" Cyclone grey - Pearl White - Tech Package - PDC - Sunroof - Twin-Chargers - Light package - Nappa Leather

  8. #8
    Model S EU#P1088 (P85)
    Join Date
    Jun 2010
    Location
    Fredrikstad, Norway
    Posts
    895
    Quote Originally Posted by widodh View Post
    Tesla does not advise you to charge with an extension cord, but I knew I was going to a location where charging wasn't possible without one (20 meters), so I took one with me.

    Normal extension cords here a 3G1.5, that means 3 wires of 1.5mm2 each. But I had a 25m 3G2.5 with me and that works great.

    I however did notice a drop in voltage from 236V on idle to 218V during charging. That was more then I calculated.

    I'd advice everybody to always have a 2.5mm2 extension cord with you instead of a 1.5mm2 to avoid the "extension cord" message from the Roadster. This message is mainly due to a high voltage drop when putting load on the wires.
    I'd actually advocate using 4mm2 cable for such a long extension cord. It should seriously limit voltage drop and heat.

    I do not think a pre-made one will be available, so one has to buy the cable and connectors separately.

  9. #9
    Senior Member Johan's Avatar
    Join Date
    Feb 2012
    Location
    Drammen, Norway
    Posts
    2,305
    Quote Originally Posted by jkirkebo View Post
    I'd actually advocate using 4mm2 cable for such a long extension cord. It should seriously limit voltage drop and heat.

    I do not think a pre-made one will be available, so one has to buy the cable and connectors separately.
    In the Nordic countries most homes only have the Schuko 220V/16A (or worse 10A) connector, except in the kitchen where almost everyone has a 25A (220-240V) outlet for the ocen/stove. I'm getting some quality 6mm cable and connectors and will make a 15-20m cord. When I visit people we'll unplug the stove, run the cable out a window opening and charge during the night.

  10. #10
    Model S R231 EU widodh's Avatar
    Join Date
    Jan 2011
    Location
    Middelburg, The Netherlands
    Posts
    3,671
    Quote Originally Posted by jkirkebo View Post
    I'd actually advocate using 4mm2 cable for such a long extension cord. It should seriously limit voltage drop and heat.

    I do not think a pre-made one will be available, so one has to buy the cable and connectors separately.
    1.5mm2 is sufficient for 16A, but you will get a big voltage drop, that's why I took 2.5mm2

    The heat from 2.5mm2 is almost nothing, while 1.5mm2 gets pretty warm with 13A or 16A continuously.

    I used this for calculating the drop: http://www.eclecticsite.be/calc/voltagedrop.htm

    Imho 4mm2 is a bit too much. It will take up a lot of space in the Roadster as well. For the Model S I'll be using 2.5mm2 for 16A and 6mm2 for 32A for sure.

    You also have to make sure you don't have to much connectors in between, since they will cause an even further voltage drop!
    BMW M5 E39 - Kawasaki Z750R - 3-phase power - Not a Roadster owner, but the co-owner of my/our company is

    85kWh - 19" Cyclone grey - Pearl White - Tech Package - PDC - Sunroof - Twin-Chargers - Light package - Nappa Leather

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. NEMA 14-50 extension cables
    By Slackjaw in forum Charging Standards and Infrastructure
    Replies: 9
    Last Post: 2014-01-01, 11:49 PM
  2. 220 Extension Cord
    By Pantera Dude in forum Roadster
    Replies: 24
    Last Post: 2012-09-03, 09:59 AM
  3. Extention cord
    By Johan in forum Charging Standards and Infrastructure
    Replies: 1
    Last Post: 2012-07-08, 03:00 AM
  4. EVSE with long cord recommendation?
    By mcornwell in forum Charging Standards and Infrastructure
    Replies: 8
    Last Post: 2012-04-18, 08:01 PM
  5. RFMC extension cord
    By Palpatine in forum Roadster
    Replies: 0
    Last Post: 2010-01-31, 07:27 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •