I think the Energica bikes are really wonderful, but they are about 200 pounds heavier than I feel comfortable handling. Plus, their prices are a bit more than I want to pay, along with I only use 120V charging at home as I am too cheap to pay for a commercial charging rate. So most of the Energica's best features would be lost on me. I am happy with using my Zero for local riding, visiting friends and for utility usages, instead of using my car. While I enjoy riding, I rarely do it for just fun. And the Energica bikes look more like fun than as a beast of burden.
You can charge the Energica with 120 VAC. The cable required comes with the bike for 120 VAC home charging. The only difference is that the cable is external to the bike, so it is not as convenient to charge from 120 VAC while on the road, such as behind the Harley shops as I did with my Zero DS in Tucson. You can still do the same with the Energica, but you need to carry the much larger and thicker cable and it takes up some room. But at home, it is just as easy to charge the Energica as it is your Zero, exactly as you have been doing.
And why do you think you would be charged a higher rate for 240 VAC? A KWH is a KWH so if you charge fast or slow, it should cost the same, with one exception. It can be cheaper to charge faster because some places have different rates for different times. You want to avoid the high rate times. Slow charging could get into the high rate charge time where the faster rate will be done by then.
On 120 VAC, the Energica charges at 1.5 KW, just a little more than your Zero (around 1.4 KW). But on 240 VAC, it will charge in half the time as it will then charge at 3.0 KWs unlike your Zero that will still charge at 1.5 KW.
But if you did 240 VAC the only additional cost is for the installation and the equipment to charge at 240 VAC. But this doesn't matter, as you can still charge the Energica the same way as your Zeros with your 120 VAC at home as you have been doing.
So now you have one less excuse to not buy the Energica. And one less excuse to not install 240 VAC, but that is a choice with the Energica. It has no real benefit to charge the Zero on 240 VAC, other than your cords will not get as warm because of the reduced current on 240 VAC and slightly less loss, but not a noticeable difference in charge times on a Zero, while the charge time will be cut in half on the Energica on 240 VAC.
-Don- Auburn, CA