Ya, it's a problem I sometimes have, since about 95% of the people I talk to are here in the USA or Canada, if not stated otherwise I geuss I assume this is where they are at. That should be right for your power then. I am trying to change my thinking on alot of stuff though, and heres a couple more thoughts too.
I have seen people here get burned with issues relating to power sometime, and have kinda burned myself too I geuss!!
Things to think about for some of us. We are out of the box (norm) and need to remember that with RE and batteries!!
If a 220 Inverter be sure it's the correct hertz for what you need. I have seen 50Hertz inverters being sold on Ebay by US sellers and they don't say it's the 50hertz model alot of the time. Some just play dumb, maybe some don't know the difference. "Surplus is us" or something like that was real bad about not listing the hertz of the inverters they were selling to US buyers.
If moving to a new country, the correct inverter still runs your existing stuff!
I mention this one because freinds I have now dumped all their forieng stuff dirt cheap when they moved back here. USA 120Vac 60hertz here, they sufferd major losses dumping all thier 220Vac 50hertz stuff. They could have brought it fairly cheap (Flew in on private aircraft, one of thier friends), they are now playing with RE stuff. Batteries don't care what inverter is connected, so all the stuff they sold cheap and gave away they could still be using just fine with the proper inverter! They spent thousands of dollars buying all new stuff here, that money could have paid a few hundred in shipping and bought an inverter with a ton left over to spend on batteries and RE! When parents got very sick they came back home. And for them the shipping would mostly been free anyway, other people maybe not.
I burned myself passing up extremely good deals on Forieng goods because of the power difference. That was stupid of me not thinking at the time, a cheapy 220V 50hertz inverter and I could have had tons of great stuff dirt cheap! Simple case of not thinking enough in time. Who cares about the hertz if you can get equipment like TVs, Frigs ect... 20% of their value simply because they are the wrong voltage and hertz if your on RE and batteries anyway?? Save $1000 buying the wrong stuff and spend $300 on the correct inverter to power it 
That one I still kick myself about! The stuff was close by (pick up, no shipping), geuss factory blemished and seconds, almost perfect, no-one wanted it here because of the power problem. It sold for about 15% of it's value and was shipped overseas somewhere.
As long as we keep the stuff plugged into the correct inverters us RE people can use either or both, the grid is not a concern. We need to remember such things when we find good deals on the wrong stuff!!
