[aprssig] 8 hour Backup Power Rule

[James Jefferson Jarvis]

> Here's a more practical question - at what level of load does a
> generator produce the most power per unit of fuel?

100%, or close to it.

Many remote sites are switching from prime power generators to generators that 
charge battery banks. The battery then run inverters. Fuel consumption is cut 
by a large portion and generator lifetime is greatly increased. 

Here is a customer of mine that does these type of systems in Alaska:
http://www.remotepowerinc.com/Batt_Inverter_System.html

A more exciting system is remotely deployed research platform on the north 
slope of Alaska. There is a detailed technical description of the system at:
http://www.polarpower.org/examples/ivotuk/index.html
http://www.polarpower.org/static/docs/IvotukExample.pdf
Live data can be seen at:
http://transport.sri.com/ivotuk/

-Jim Jarvis KB0THN