[time-nuts] Where does 28V come from?

Steve Rooke sar10538 at gmail.com
Tue Jul 21 07:15:56 UTC 2009


2009/7/21 Hal Murray <hmurray at megapathdsl.net>:
>
>>       That said, the modules also appear to be powered by 28VDC, add some
>> regulation, you could use the chassis to power the Thunderbolt, and
>> mount it in one of the blank panels.
>
> Lead acid batteries are close to 2V per cell.  For cars/trucks, they come
> conviently packaged in 6V and 12V units.  The phone company works off 48V.
>
> But where does 28V come from?

A nominal 24V lead-acid battery on charge will have a terminal voltage
of 27.6V (I believe) so perhaps this is where it comes from.

73,
Steve

>
> The Isotemp OSCO 127-10 data sheet says 27 V, but that's +3, -6 or 21-30V
> which straddles both 24V and 28V.
>
>
> --
> These are my opinions, not necessarily my employer's.  I hate spam.
>
>
>
>
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-- 
Steve Rooke - ZL3TUV & G8KVD & JAKDTTNW
A man with one clock knows what time it is;
A man with two clocks is never quite sure.



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