Forum Discussion
NOK 5G21 Gateway Battery Backup
How does the battery backup option work on the High Speed Home Internet NOK 5G21 Gateway device. When the device gets unplugged or losses power, the device configures to battery operation, then the ...
Wow that is incredible… could be the switching power supply is most efficient at full-rating but with something like 1.25A (12V @ 15W) it seems that your measurements show it's less than 50% efficient. YUCK. Then again, there may be additional inefficiencies when considering the 12V to 110V power outlet and then the 110V to 12V plug-in power adapter, combined. Assuming they're identical, then each conversion is 68% efficient (square root of 7/15). Even that is pretty low IMHO.
