dvu wrote: Our mains is only 100amp.
Will I need to upgrade my service panel to a 200 amps?
Our stove is electric and so is our dryer, I can't imagine having all that running at the same time along with charging 2 EV a good thing on our old house service panel of 100 amps.
If you are willing to accept the EV charge rate varying, there is a modern version of the so called load minder available and meets code, it affectively is upstream and shared off of your panels available load, meaning if you are charging and turn on your oven one of your EVs will cycle between charging and not charging while it's in use <or> the more advanced solution reduces its rate to what's left over.
There was a thread with a Canadian guy who could not upgrade his home electric that had a link to one.
I'm not sure if this is the thread rmay635703 was thinking of: http://www.mynissanleaf.com/viewtopic.php?f=27&t=23698&start=30
, and he was in Alaska not Canada, but quoting from ermackey "New solution idea: Using a Samsung Smartthings Hub and a few Z-wave relays, I can put my Hot Water and two car chargers, on Z-wave "smart" switches. One of the new app features is the "Max Energy" app that turns off specific devices as KW consumption is reached. I could "tier" my appliances to operate on a priority tier ranking. AEON makes a energy monitor that works with Smartthings to utilize this feature." In that same thread, gshepherd's suggested the extremely energy efficient "condensing" dryer, and freed up a 240V breaker.
I was wondering too about converting the stove and/or the dryer to gas. I live in Florida, and everything here is electric too, but gas is so much nicer for cooking, and using electricity to turn into heat for a dryer seems almost criminal when the electricity could do so much more.
Another idea might be PV with or without a battery backup. That would be a way to get more out of sunny days, although with just a 100 amp panel it might require a line-side tap, which is less than optimum and power companies frown upon. But even if it was a small enough system and just use a 20 amp backfed breaker, it would help.
And, instead of a simple load calculation, it is possible to gather 30 days of real-world usage and use that for the calculations and still be code compliant. But you'll have to consult a very sharp electrician for that who really knows code.
Call me "thrifty," but I'd explore a lot of options before I'd pay $3K - $5K to upgrade the panel, even if the panel is considered low for modern homes.
Of course, you could do it the real simple way and just charge the LEAF at 120V when the Tesla needs topping off. It is a dilemma I'd love to have.