A couple of months ago i saw a place on the east side of JFK by Churchill (north of Churchill) that had a sign advertising dry ice.....I noticed
because someone els? on this forum was also inquiring about it......
More is better to a point. You need enough batteries to meet your needs plus 25% extra. The more batteries, the longer you can keep things running when the power goes out. You cannot necessarily run more things without upping the output of the inversor itself.
Equipment with motors/compressors require more power to start running when they switch on than they do to stay running once started.