LA batteries don’t “only trickle charge”, but a) the cost per kW of UPS equipment is usually significantly higher than the generator, and b) the generator has a much higher surge current capability than inverter-based sources, and c) the power that actually goes through the battery loses anywhere from 10-30% in the round trip, so you get less usable output by routing power that way. If the cost issue becomes a smaller obstacle and you can be clever about bypassing the battery when appropriate, then like hybrid cars you can overcome those challenges… but not everyone or all affordable equipment can do that.
LA batteries don’t “only trickle charge”, but a) the cost per kW of UPS equipment is usually significantly higher than the generator, and b) the generator has a much higher surge current capability than inverter-based sources, and c) the power that actually goes through the battery loses anywhere from 10-30% in the round trip, so you get less usable output by routing power that way. If the cost issue becomes a smaller obstacle and you can be clever about bypassing the battery when appropriate, then like hybrid cars you can overcome those challenges… but not everyone or all affordable equipment can do that.