On 12 Feb 2014 06:23:07 GMT, "DoN. Nichols"
wrote:

On 2014-02-12, Gunner Asch wrote:
On Tue, 11 Feb 2014 21:24:58 -0600, Richard
wrote:

On 2/11/2014 7:45 PM, Howard Beal wrote:
"Gunner wrote in message
...


Is 16.5 volts "too high" for most 12vt dc devices like Marine radios,
fish finders, GPS devices, CB radios, am/fm/cd players and the like?

All of these are made to work in an auto as well (except the
fish finder and the Marine radio likely), and the voltage in an auto can
get that high, depending on engine RPM and temperature, so I would think
that they likely can. The "12V" is nominal and 14V is more common in a
properly functioning automobile.

Is there an alternator or generator keeping the voltage up in
the battery in the boat? (I somehow missed the original article.)

The bigger Venture 24 has a 9.9 hp Johnson with electric start..so it
has an onboard alternator. No idea of how much current it will sent
back to the batteries as a charging current when its running. So it
may charge fast enough if run for a while. Or not.
https://picasaweb.google.com/1040422...2602/Venture24


The smaller, freshly revamped Ensenada 20 has a rope start 5hp with no
ability to charge, and thats the one I was pondering putting the
16volt battery unit in.
https://picasaweb.google.com/1040422...602/Ensenada20



Yes.


If the voltage is too high..what cheap and easy method is there to
drop the voltage down to 13.5/12vts to run my various electronic
devices? Besides a big as resistor....?


Build a regulator using a 7812 voltage regulator and some 2N3055
transistors. You could also use a LM317 and make output voltage
adjustable. Don't forget the crowbar on the output.

Best Regards
Tom.




Actually, before that he should try to charge them and see if they are
worth all the trouble... How is, of course, the question.

As I noted in my original post..they charge just fine.

What about a simple old fashion automotive regulator that bolted to
the firewall?

The really old ones are for generators, and somewhat newer ones
are for alternators. Both regulate by pulsing on and off the field
current in the respective device, and the battery is a part of the
voltage limiting circuit. The actual voltage is a function of (among
other things) the temperature under the hood, as it affects the
electro-chemical stuff happening in the battery.

Anyway -- those regulators are pretty useless without an
associated generator or alternator. (Is there one in the boat, with a
big engine sitting there cranking the alternator/generator and turning
the prop? I thought that you were working on a sailboat. The ones
which I am familiar with only had a bolt-on outboard for when the wind
died and you needed to get into your mooring.

Correct. Most..not all..but most sailboats of this size have an
outboard. Generally (not always..some are found in 21 footers etc)
inboards (gas or diesel) are in boats 25 foot and up. Many of the
older boats have blown/worn out their inboard engines..so they are
either removed, or an outboard mount is placed on the stern and used.

Sailing into a dock or loading ramp can be interesting..particularly
if there are a number of other boats loading/unloading..so an outboard
,while not necessary..is very damned handy when you can line up, back
out etc etc. And having the ability to motor in to shore if something
unexpected breaks or someone is hurt..can be a life saver.

Enjoy,
DoN.

Gunner

--
"Virtually all members of [radical] groups sincerely believe that
they are fighting the Establishment. In reality they are an indespensible ally
of the Establishment in fastening Socialism on all of us.
The naive radicals think that under Socialism the "people" will run everything.
Actually, it will be a clique of Insiders in total control, consolidating and
controlling all wealth. That is why these schoolboy Lenins and teenage Trotskys
are allowed to roam free and are practically never arrested or prosecuted.
They are protected. If the Establishment wanted the revolutionaries stopped,
how long do you think they would be tolerated?



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