oldbeyondmeasure

You should be fine. Based on the power flows that I can see through my electric meter, the charger that comes with the Energi will draw about 1,500 watts at 120 volts. That is within the rating of your extension cord. When I first got the C-Max, I ran a 75-foot extension cord of the same wattage rating with no problem. Eventually I had an electrician add a new circuit to the corner of the house where the charger is now mounted. I cover the charger with a towel so that the sunlight doesn't degrade it. (Not sure that it would, but taking no chances. Where I live, the UV light is pretty brutal on plastic things that live outdoors.) As far as a permanent solution is concerned, you should consider whether a 240 volt charger makes more sense for you than the 120 volt charger that comes with the C-Max Energi. My very crude calculation is that the 120 volt charger is about 75% efficient, so filling the battery with 5.6 kWh takes about 7.5 kWh at the electric meter. The 240 volt charger will be about 90% efficient, so the power consumption would be about 6.2 kWh at the electric meter. Plus, the 240 volt charger will charge much faster because it will use the full capacity of the charging equipment in the C-Max (the charging equipment in the C-Max can accept more power than the 120 volt charger can deliver). Offset against this is the cost of a 240 volt charger ($350 to $500???) and the cost of running a 240 volt circuit to where the charger will be mounted. (You might have a 240 volt outlet in the right place already, but I didn't.) In the end, I decided that the electricity savings from a 240 volt charger wouldn't offset the cost of the charger and running a 240 volt circuit. And if I remembered to plug in the car when I arrived at home from work each night, the car would be fully charged by the next morning so the faster charging of a 240 volt charger wouldn't be worth much to me. It is a close call. My wife would like to get an all-electric SUV. If we do that, then we will have to revisit the charger issue, because a 120 volt charger will take too long to fully charge the battery in an electric-only SUV. Hope this helps.

Second comment back to Rich in NJ: if you haven't looked on the Ford website yet, try going to https://ford.com/support/. You should be able to enter your VIN, then click the search button. Then if your vehicle comes up, scroll all the way down the page to a "Recalls" button. Even if it says "No Recalls," click on "View Details." When I did that, I found an entry about the 3G to 4G modem upgrade under "Customer Satisfaction Programs." Hope this helps.

I am finally getting my 4G modem upgrade done today. It would have been done about two weeks ago, except that I contacted Covid shortly before Christmas and had to isolate for ten days. Responding to Rich in NJ, I have a letter from Ford to dealers that I found somewhere. I only have the first page of the letter. As I read it, the letter indicates that C-Max Energi models assembled in Michigan from April 15, 2014 through October 2, 2017 are included in the 4G modem upgrade. But a 2015 C-Max Energi SEL would have been assembled during that period, right? Letter_to_Dealers_re_3G_4G.pdf

I see my name listed above (@oldbeyondmeasure) with a question. I have not been upgraded yet; my installation is scheduled for next week.

No, sorry, not giving you a name.

Some notes from Southern California: 1. Advantage Ford in Duarte quoted me a parts cost for the 4G modem upgrade of $318 plus $33 sales tax for a total of $351. It is a special order so I had to pay $351 for the part today and they should call me when the part arrives. Not sure when that will be. 2. I have a 2017 Ford C-Max Energi like cwdancer19380. I have a Samsung Galaxy S9 and Android Auto has worked me for some time now when the phone is connected to a USB port. I may have had to buy a data transfer cable; I cannot remember. 3. I updated SYNC 3 to version 20204 today by installing from a USB drive. It was a difficult process; I think I did not follow the Ford instructions closely enough.