You are right Don. The Delta Q charger is 850 watts. My home doesn't have 240Vs, just 120V. I still think that the OBC gets too hot for its own good when charging for a long time and that heat likely leads to one of its components failing eventually. I bet that if it had a fan to keep it cool it would last a lot longer. That Delta Q is a real brick. While it also gets pretty hot when charging, at least it has plenty of fins to keep it cool, especially when being used in my 60 degree F garage.
Friends don't let friends charge at 120v
Here is what you need to start charging at 220v, in any house (except for the one described by DonTom)
https://quick220.com/products/copy-of-model-a220-15d-plus-2-adapters-for-international-plugshttps://www.ebay.com/itm/304570594177?hash=item46e9d27381:g:LacAAOSw5-xifd7fI've been using this myself, since the Volt days of 2016.
The Chevy EVSE only draws 12A (at 220v) making it safe for residential 15A Circuits.
You end up with 2.9kW charging, which was plenty for me; on a Volt, Bolt & SR/S.
The secret is, the Chevy EVSE (and probably all L1 EVSE) provide L2 [220V] charging, when you connect them to 220V.
So the cord that came w/ your Zero might work too.
It you want, I can test my Zero L1 cord and confirm.
(I had already loaded up on Chevy EVSE's before getting a SR/S.)
L1 EVSE are low draw [12A] so they can work with the Quick220 and normal 15A Circuits.
You just need to find (2) Circuits on different phases (for the Quick220), which isn't hard to do.
It's all vetted on the Volt Forums and Quick 220 has more info, on their web site, as well.
Any questions; PM me and/or post here.