"Larry" wrote in message
...

Any charging system must have a series resistance to limit charging
current on initial charge. This resistance drops the excess voltage
between the battery's voltage at whatever state of charge it's in, what
the voltmeter in the dash reads, and the charger's natural design
voltage, which is around 18 volts for 12V alternators to make the
charging stable up to 15VDC, giving the regulator something to control.
(Your solar panel chargers run 18V loaded to spec and up to 28V sitting
in the sun totally unloaded. Their internal resistor is the silicon...
(major snippage)

Wow! That was a great post, Larry. Thanks!

Ummm..."MTBF"? Something do do with planned failure from context, but could
you elucidate?

"KLC Lewis" wrote in
et:

Ummm..."MTBF"? Something do do with planned failure from context, but
could you elucidate?





Mean Time Between Failures. It's the tolerance set in the specifications
as to how long it should run, in the mean, between failure modes....

MTBF for the Chinese hard drives in your computer is hundreds of thousands
of hours for $99.

MTBF for a $35,000 American car is one hour past the end of the warranty
period, but they're not really good at making them last that long....

MTBF for a cored boat deck depends on whether it rains or not.

--
There's amazing intelligence in the Universe.
You can tell because none of them ever called Earth.

"Larry" wrote in message
...
"KLC Lewis" wrote in
et:

Ummm..."MTBF"? Something do do with planned failure from context, but
could you elucidate?





Mean Time Between Failures. It's the tolerance set in the specifications
as to how long it should run, in the mean, between failure modes....

MTBF for the Chinese hard drives in your computer is hundreds of thousands
of hours for $99.

MTBF for a $35,000 American car is one hour past the end of the warranty
period, but they're not really good at making them last that long....

MTBF for a cored boat deck depends on whether it rains or not.

--
There's amazing intelligence in the Universe.
You can tell because none of them ever called Earth.

Gotcha! thanks again. :-)