I’m considering the AC300+B300 to use as a backup power source during power outages. My plan was to run my critical devices (refrigerator, gas furnace, some lights) directly from the AC300. I had planned to periodically charge the AC300 using a small (1600W) gasoline generator, as needed.
My generator has plenty of power to periodically charge the AC300. (2-3 hours would be plenty to charge a B300 battery.) However, my generator does not have enough surge power to start my furnace or refrigerator reliably. As such, I planned to run all my devices from the AC300 (which has plenty of power), and periodically use the gasoline generator to keep the AC300 charged.
My concern / question is regarding the UPS mode of the AC300: From what I can gather, when the AC300 is plugged into AC, it feeds that AC directly to the output, rather than use the inverter. (I suspect this is because the inverter is a “bi-directional” inverter that can either be used to charge the battery from AC, or create AC from the battery, but not both at once.) As such, I’m not sure that the built-in AC charging will work properly in my particular case.
I’ve read through the different UPS modes in the manual, and I can’t tell for sure if one of the modes will work. (I really want an “Online” UPS mode.) Naturally, I don’t want to spend close to $4,000 unless I’m sure that it will work
As such, I’m hoping to find a way that I can make the AC300 work in my case. The only thing I could think was to buy one or two Bluetti T500 / 500W AC to DC adapters, and use them to charge each of the B300 battery(s) directly, from it’s AC adapter port. It would cost slightly more, but seems like it would perhaps allow me to charge from a generator, while still using the AC300’s powerful inverter.
Does anyone have a good idea of whether this might / might not work? (In particular, can you charge the B300 directly with the T500 while it’s connected to the AC300?) Are there better / alternate approaches that might work better?