Some MPP inverters can supply backup power during the day using only PV connected to the PV DC input. No batteries needed!
The only other major brand I'm aware of with that feature is SMA. But while SMA requires a bunch of extra hardware if you decide to add batteries later, MPP just works with batteries.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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