Yeah, that's because Logistics Pipes don't have a constant energy drain. They only use power when items are passing through, unlike Applied Energistics. Probably the biggest upside of LP is that, if you ever run out of power, you can still access your storage.
I have a "low power mode" lever that I can switch that basically disconnects everything but the drives and storage busses. This allows me to run off a filled cell for quite some time.
Protip: don't store the cell in the storage system that you need to power with said cell. Causes a bit of an annoying chicken / egg situation
I actually have multiple layers of redundancy in my base. I have a bunch of combustion engines that I can use when (for some reason) my farms fail and the supply of charcoal to my boilers end. And I have a set of liquid fuel boilers that aren't used with 2 full steel RC tanks, one with fuel and one with ethanol. So I think I'm good