There's three ways you can handle this:
1. Stick with 120 volt charging, assuming your range needs are very modest, and the outlet and circuit you plan on plugging into are robust and not shared with anything else.
2. Install an outlet of 40 amps that lets you plug this EVSE in to draw 27.5 amps.
3. Buy a separate EVSE that matches what your existing feed is able to supply.
As far as 200 amps, with modern electrical loads, it may be necessary if you want a 40 amp or higher circuit especially if you have an all-electric home or have central A/C. I have a 125 amp panel on my circa 1981 townhome, and while I have gas heating/cooking I do have central A/C. The electrician said that a 30 amp circuit is the max I can safely have, which is why I have a Clipper Creek LCS-25 (the -30 wasn't yet available). Your electrician will advise you as to the maximum circuit rating that is available, so hold off on buying any additional parts before this consultation.
LeftieBiker wrote:You don't need a 200 amp panel. You just need a free 40 amp or higher 240 volt circuit. A dryer circuit is often available, but these are usually 30 amps, and in their less than infinite wisdom Nissan made the EVSE 27.5 amps, which is too high a current for continuous use on a 30 amp circuit.
"In their less than infinite wisdom" Nissan could have played it safe and made it a 16 amp EVSE (like the EVSE Upgraded OEM ones), and someone else will complain than the car will be charging slower than designed.
Now it would be nice if the factory EVSE were adjustable for various wattages like the Tesla one, but then again you're paying a lot more for a Tesla than a Nissan.
Blue Ocean 2012 Leaf SV, lost that 1st bar at 34 months/26,435 miles. Lease returned 2 months later. Final LeafStat figures: 225 Gids, 17.44 kWH, SOC 91.89%, SOH 82.36%, 69.49% HX, 54.57 Ahr, battery temp 61.8 F.
Now driving a 2015 VW eGolf SEL.