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I use Phoenixd but not with LNbits.
From memory there's a 20k sats fee for the wallet. You don't pay it straight away, it comes out of the balance when you exceed 20k.
One thing I notice is the fees can be high for small zaps. If you send 1 sat they take 4 sats in fees. The good thing is that you can run it on any basic computer so it can be online 24/7.