I pulled the trigger on the EcoFlow delta pros with the 220v Dual Voltage hub. I waited 3 months for the 220volt hub to arrive so just used extension cords to power certain appliances. So far, so good. The long awaited dual voltage hub for my system arrived and it has been running most of my home through a Reliance controls 30 amp manual outdoor transfer switch. Some circuits in my home are still line powered. I was hoping that as a contingency for occasional cloudy days at this desert house, especially with the upcoming monsoon season, I could have a (Wemo) remote switch to bring line power to the Delta Pro unit when there is not enough sun to charge it. It turns out that this is not possible. I learned this a few days ago when trying to charge a unit with 110volt line power and then smelled smoke or something burning coming from the unit with no charge being displayed on the unit. It will still charge with ac power when the dual voltage hub is disabled but will not charge under the normal operation with The hub in place. No where does any manual say that the hub and ac input power cannot be used at the same time. I reached out to Eco Flow directly and they seem to not be aware of the failure of these units to charge via AC house current when the dual voltage hub is active. They are only willing to do warranty replacement. Has anyone else had this issue. I think I'm going to run into the same problem with warranty replacements.