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Re: Using an Extension Cord With The FFE

Posted: Mon Apr 03, 2017 4:58 pm
by EVA
Best advice ever Triangles. Can't over emphasize uncoiling the cord. Never use an extension cord that is wound up in a coil. It will overheat. No coils in a bucket, no roll up device, no coil just sitting on the floor.

Re: Using an Extension Cord With The FFE

Posted: Mon Apr 03, 2017 5:19 pm
by amped
This one seems to be intended for a 50 amp/240v circuit - it has NEMA 6-50 connectors. I was under the impression that you were talking about extending from a standard 15A/120v receptacle, in which case you would need to change out the plug/connectors. I'm not sure how feasible this would be with such heavy gauge wire and you would also have to worry about properly weatherizing it.

Your link on sizing is for <3% voltage drop on a 12 volt circuit and greatly overestimates what would be needed for 120v. Also, IIRC, the FFE EV onboard charger is not exquisitely sensitive to voltage and can accept input from ~100 to ~260 volts so significantly greater than a 3% voltage drop could be tolerated. You just need to worry about sizing the cord thick enough to avoid overheating (and, as others have pointed out, keep it uncoiled during charging). I think 12 gauge should be more than adequate for 20ft.

Re: Using an Extension Cord With The FFE

Posted: Mon Apr 03, 2017 10:55 pm
by EVA
Wow, this just gets more complicated as we go.

Amped is absolutely correct Marcham93 - you picked the wrong extension cord. That one will never plug into a 110V outlet. It is a NEMA 6-50 plug that looks a lot like a regular old three prong plug (that's why I thought the cord would work, the plug looked correct) - but is way bigger.

What you need to buy is a 120V extension cord at least 10 gauge for all three conductors. This one fills the bill. It isn't necessarily special, it just works.

Under NO circumstances should you use that Goodyear reel cord you linked to earlier. That is a fire waiting to happen unless you unwound the whole cord at every use. 40 feet is probably too long anyway, and the gauge is on the light side.

Re: Using an Extension Cord With The FFE

Posted: Tue Apr 04, 2017 7:34 am
by triangles
:lol: That cord he linked is what I use for my L2 EVSE except the 25' version. 8ga was a little lighter than what I wanted but the cord is supposedly rated for 40A. It never gets even warm with the 30ish amps my FFE pulls.

Re: Using an Extension Cord With The FFE

Posted: Wed Apr 05, 2017 8:56 am
by shniestEV
I use an extension cord quite frequently lately. At my work we have standard chargepoint parking spots but they are a good 10-15 minute walk from my office. I found our parking garage beside the office is equipped with regular 120v outlets near some parking stalls. I started using these since my commute to work only uses about 30km of battery I can charge with these stalls for about 6 hours and be able to leave work with a full battery so no need to park so far away to use the chargepoint stations.

I haven't had any issues and started using an extension cord since the cold weather began in December. Unfortunately there is a cage blocking the plug so to make life easier I run an extension cord through the cage to avoid having to set the convenience cord up every day and also the risk of leaving it open in the public. My luck would have it that I found a heavy duty extension cord in the garage which i noticed had been there for almost a year so figured it belonged to nobody or someone forgot about it. I leave this here permanently i'm surprised it hasn't be stolen yet!

So almost everyday (if i get in early enough to park in one of 3 stalls the cord reaches) I will use the extension cord with my ford convenience cord evse (120v).
Its about a 50ft cord but is construction heavy duty i'll have to see if the gauge is labelled but figured its probably around 8-10 gauge from experience.

It doesn't heat up the cord and haven't noticed any type of issues.