Can you use an external battery charger to "quick charge" the boat battery
(after extended storage) without disconnecting the battery leads, or should
the battery be disconnected first? Didn't know if the charger would have
any adverse impact on the boat's internal charging/electrical system if the
battery is left connected.
Thanks in advance.

Can you use an external battery charger to "quick charge" the boat battery
(after extended storage) without disconnecting the battery leads, or should
the battery be disconnected first? Didn't know if the charger would have
any adverse impact on the boat's internal charging/electrical system if the
battery is left connected.
Thanks in advance.

Larger boats virtually all have on-board battery chargers, and you do not have
to disconnect the batery cables prior to using a charger.

However, you should not try to charge the battery from the charger and run the
engine (therefore the alternator) simultaneously. One or the other at a time.

"Gould 0738" wrote in message
...
....
However, you should not try to charge the battery from the charger and run the
engine (therefore the alternator) simultaneously. One or the other at a time.

And why is that? Do I have to disconnect my solar panels when I run the
engine? I have two engines with two alternators - can I run the both at the
same time?

And why is that? Do I have to disconnect my solar panels when I run the
engine?

Assuming you have a photovoltaic charge controller, ordinarily not. AFAIK. As
an unaplogetic ol'stinkpotter, I'm not extremely well acquainted with solar
panels. You would be better prepared to discuss them than I.

Beyond that, I'm not interested in firing up another anal retentive ****ing
contest of dueling websites with you, Jeff.

If you have a contrasting opinion that it is advisable to run the battery
charger and the alternator at the same time, please present it.

Actually, I was honestly wondering if there was a specific reason. I had been
given that advice many years ago (always disconnect shore power before starting)
but in fact I have done it many times with no ill affects. Since my system
frequently has several charging devices running (2 alternators + solar) I would
think that the only item at risk would be the shore power charger, a Heart 2000.
I've scanned the manual and found nothing warning against starting the engine
while the charger is running, but perhaps I missed something.

I can think of two problems: first is the possibility of starting with a dead
battery so the full load is on the charger. Of course, my presumption is that
the boat has been on shore power for a while, and a dead battery is unlikely.
The other is that different "smart" regulators and chargers will get conflicting
signals as to the charge state - from time to time I've had my big alternator
with its smart regulator decide to go into float mode and the load shifts over
to the other smaller alternator.

However, neither of these issues are a real concern if all I'm doing is running
the engines at the dock for some test. So I'll repeat the question: Why must
you remove the shore power before starting? What is at risk? Is this a
holdover from the days of more primitive equipment?



"Gould 0738" wrote in message
...
And why is that? Do I have to disconnect my solar panels when I run the
engine?

Assuming you have a photovoltaic charge controller, ordinarily not. AFAIK. As
an unaplogetic ol'stinkpotter, I'm not extremely well acquainted with solar
panels. You would be better prepared to discuss them than I.

Beyond that, I'm not interested in firing up another anal retentive ****ing
contest of dueling websites with you, Jeff.

If you have a contrasting opinion that it is advisable to run the battery
charger and the alternator at the same time, please present it.

I also start my engine with the charger hooked up and running and like Jeff
do not remember seeing warnings in the manual. I guess the only fear is
starting the engine with a weak battery that needed the charger to supply
enough amps. The next time you start the engine (maybe 20 miles offshore)
you find a weak battery that has to little gas. That condition you would
like to discover at the dock where a replacement battery is minutes away.


"Jeff Morris" wrote in message
...
Actually, I was honestly wondering if there was a specific reason. I had
been
given that advice many years ago (always disconnect shore power before
starting)
but in fact I have done it many times with no ill affects. Since my
system
frequently has several charging devices running (2 alternators + solar) I
would
think that the only item at risk would be the shore power charger, a Heart
2000.
I've scanned the manual and found nothing warning against starting the
engine
while the charger is running, but perhaps I missed something.

I can think of two problems: first is the possibility of starting with a
dead
battery so the full load is on the charger. Of course, my presumption is
that
the boat has been on shore power for a while, and a dead battery is
unlikely.
The other is that different "smart" regulators and chargers will get
conflicting
signals as to the charge state - from time to time I've had my big
alternator
with its smart regulator decide to go into float mode and the load shifts
over
to the other smaller alternator.

However, neither of these issues are a real concern if all I'm doing is
running
the engines at the dock for some test. So I'll repeat the question: Why
must
you remove the shore power before starting? What is at risk? Is this a
holdover from the days of more primitive equipment?



"Gould 0738" wrote in message
...
And why is that? Do I have to disconnect my solar panels when I run
the
engine?

Assuming you have a photovoltaic charge controller, ordinarily not.
AFAIK. As
an unaplogetic ol'stinkpotter, I'm not extremely well acquainted with
solar
panels. You would be better prepared to discuss them than I.

Beyond that, I'm not interested in firing up another anal retentive
****ing
contest of dueling websites with you, Jeff.

If you have a contrasting opinion that it is advisable to run the
battery
charger and the alternator at the same time, please present it.

Add a third to the list. One of my boats has an old ferro-resonant type
charger, the other has a smart charger. The former boat has Volvo diesels,
the latter has Cats. Both boats have 110 volt generators. When getting
underway, I fire up the engines, disconnect shore power, usually start up
the generators (which also powers the chargers), and get underway. Once in
a while I remember the charger is still on and will turn it off at the
electrical panel, but most of the time they run along with the alternator.
Never had any problems. I suspect the chargers simply back off the current
output since the alternator can supply much more current.

As I think about it though, this may not be a good idea, although I can't
think of an electrical reason why it would hurt anything. Good question.

Eisboch

"Rick & Linda Bernard" wrote in message
...
I also start my engine with the charger hooked up and running and like
Jeff
do not remember seeing warnings in the manual. I guess the only fear is
starting the engine with a weak battery that needed the charger to supply
enough amps. The next time you start the engine (maybe 20 miles offshore)
you find a weak battery that has to little gas. That condition you would
like to discover at the dock where a replacement battery is minutes away.


"Jeff Morris" wrote in message
...
Actually, I was honestly wondering if there was a specific reason. I
had
been
given that advice many years ago (always disconnect shore power before
starting)
but in fact I have done it many times with no ill affects. Since my
system
frequently has several charging devices running (2 alternators + solar)
I
would
think that the only item at risk would be the shore power charger, a
Heart
2000.
I've scanned the manual and found nothing warning against starting the
engine
while the charger is running, but perhaps I missed something.

I can think of two problems: first is the possibility of starting with a
dead
battery so the full load is on the charger. Of course, my presumption
is
that
the boat has been on shore power for a while, and a dead battery is
unlikely.
The other is that different "smart" regulators and chargers will get
conflicting
signals as to the charge state - from time to time I've had my big
alternator
with its smart regulator decide to go into float mode and the load
shifts
over
to the other smaller alternator.

However, neither of these issues are a real concern if all I'm doing is
running
the engines at the dock for some test. So I'll repeat the question:
Why
must
you remove the shore power before starting? What is at risk? Is this a
holdover from the days of more primitive equipment?



"Gould 0738" wrote in message
...
And why is that? Do I have to disconnect my solar panels when I run
the
engine?

Assuming you have a photovoltaic charge controller, ordinarily not.
AFAIK. As
an unaplogetic ol'stinkpotter, I'm not extremely well acquainted with
solar
panels. You would be better prepared to discuss them than I.

Beyond that, I'm not interested in firing up another anal retentive
****ing
contest of dueling websites with you, Jeff.

If you have a contrasting opinion that it is advisable to run the
battery
charger and the alternator at the same time, please present it.

99% of chagrin sources are voltage controlled if controlled at all. If an
alternator sees a higher voltage then it is set at it simply stops charging,
the same with sophisticated shore power chargers.

The most popular problem with continues shore charging is that a battery will
get a surface charge. This has caused several people to think that their
batteries were good and found out that after a brief time with out a charge
source they could not start.

Just my personal experience.

Mike

I hear you, brother - my batteries have caused me some chagrin over the
years too!

====

Charles T. Low
- remove "UN"
www.boatdocking.com/BDPhoto.html - Photo Contest
www.boatdocking.com
www.ctlow.ca/Trojan26 - my boat

====

"MIDEMETZ" wrote in message
...
99% of chagrin sources are voltage controlled if controlled at all...

99% of chagrin sources are voltage controlled if controlled at all. If an
alternator sees a higher voltage then it is set at it simply stops charging,
the same with sophisticated shore power chargers.

The most popular problem with continues shore charging is that a battery will
get a surface charge. This has caused several people to think that their
batteries were good and found out that after a brief time with out a charge
source they could not start.

Most people who leave a boat in a slip will want to keep the batteries fully
charged.
A decent charer will bring the batteries to 13.2 or 13.3 and then supply only
enough
juice to sustain them at this level. If a through-hull should fail, a bilge
alarm, an adequate pump, and a fully charged battery might slow the net
flooding down enough and attract sufficient attention to save the boat.
Starting with a partially discharged battery is an unneeded handicap. If the
battery is discharging to run a bilge pump, but is being simultaneously
recharged, the number of hours the pump can run will be significantly extended.

Starting the boat with the battery charger running can disguise a weak battery.

Turning on the battery charger once the engine is running will not, ordinarily,
increase the rate at which the battery is being charged. See note below about
proper wiring.

There is an upper voltage limit on some of the regulators and controllers used
to regulate charging from alternators, AC converters, or any other sources like
wind or solar. In some 12-volt system cases, this is 26-28 volts. An alternator
pumping out 14-15 volts and an AC converter doing the same could blow out some
of these components. I have direct knowledge of
an alternator that required a rebuild. According to the rebuild shop, the
damage was "consistent with the things we see when people run their battery
charger and their alternator at the same time."

If a boat is properly wired, there may be only minimal risk of screwing
something up by running the alternator and the AC converter at the same time. A
good portion of the new boats coming off the assembly lines and a likely
majority of boats that have had any electrical cobbling done after manufacture
are not properly wired.

When I worked as a broker, I would never start somebody else's boat with the
shorepower running. Why risk it? If a boat wasn't going to start without the
charger running, the time to address and correct that was *before* a
prospective buyer came aboard.