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Hi - I'm trying to plan an off-grid system and have run into a problem with selecting an inverter/charger. The system needs to handle 22 kWh per day (most days won't need that, but just being safe). I plan on using 48v for everything, with LiFePO4 batteries. Based on that usage, this site...

I'm in the US and would like to use solar even if the grid goes down while using a grid-tied system. I'd like to get the cost savings of feeding the grid while the grid is up, but if the grid goes down I want to be able to use the solar to charge my batteries. I'm not concerned about a failover...