NOK 5G21 Gateway Battery Backup

ChuckEgg.com wrote:

 

I use an EcoFlow RIVER Max Portable Power Station which holds 576 Watt Hours on a full charge.  This power station has a variety of outlets:  110v for electronics and appliances, also 5v USB jacks and three different types of 12v jacks.

110v to T-Mobile Gateway ≈ consumes 15 amps  ≈  backup power for  38.4 hours

12v to T-Mobile Gateway = consumes 7 amps = backup power for 82.3 hours.

So, during a power outage, it’s not likely I’d power the gateway for 24/7, but I could theoretically stream video to a tablet and keep tablets and phones charged for 2-3 days using only the power station.

https://ecoflow.com/products/river-max-portable-power-station?variant=39335175979081 

Do you mean 15 Watts, and 7 Watts? That makes the math work, but it may be much less due to quiescent power losses (i.e., nothing connected, power consumed by power supply and circuitry) and inefficiencies (Pout/Pin = approx 80%). Most flyback power supplies are the most efficient near full load, mostly due to minimization of the quiescent losses (they're still there but much less than power delivered). Many of these power supplies calculate the watt-hours by multiplying the nominal voltage by the amp-hour value of the batteries but the actual measured power supply delivery duration is often much less.