On Nov 25, 8:42*am, Tim wrote:
On Nov 25, 6:59*am, Tom Francis - SWSports





wrote:
I've been trying to get some specs on this unit - seems like a really
good way to charge trolling motor batteries on long runs spot-to-spot
on a large lake or on runs from spot-to-spot inshore.

http://tinyurl.com/564jl4

I can't seem to find anything that gives the specifics on how this
works. *I'm speculating here, but I would assume that it works to
charge the trolling motor batteries once the main battery system is
charged. *I'm guessing that is must work on an interrupted basis -
meaning that once the starter battery is charged, it switches to
charging the 24 volt system.

Here's the thing - how?

If I were designing this, I would make it so the engine would have to
be running above idle and the charger producing more than the nominal
13.6 volts needed to run the engine. That would mean that each battery
in the 24 volt system would need to be charged a little at a time -
like say a minute for one, a minute for two - back and forth until the
batteries were charged.

That's the way I would do it, but there are other ways. *I just can't
find out how it works.

Anybody have experience with these things?

Tom, I'm not really sure without seeing one, but I believe this is a
small transformer and rectifier pack, that allows you to charge 24v
and run 12v accessories. Delco and Leece-neville have been doing this
for years on heavy equipment.

One set of black/red wires ould go to 12v and the other black and red
would go to a 24v bank. one red would probably go to key switch, and
other red go to alternator charge wire.

Not sure, but thats how I see it.- Hide quoted text -

- Show quoted text -

Correction. Black/red 24, blk/red 12, blk/red keyswitch and engine
ground.

or something like that.

"Tim" wrote in message
...
On Nov 25, 8:42 am, Tim wrote:
On Nov 25, 6:59 am, Tom Francis - SWSports





wrote:
I've been trying to get some specs on this unit - seems like a really
good way to charge trolling motor batteries on long runs spot-to-spot
on a large lake or on runs from spot-to-spot inshore.

http://tinyurl.com/564jl4

I can't seem to find anything that gives the specifics on how this
works. I'm speculating here, but I would assume that it works to
charge the trolling motor batteries once the main battery system is
charged. I'm guessing that is must work on an interrupted basis -
meaning that once the starter battery is charged, it switches to
charging the 24 volt system.

Here's the thing - how?

If I were designing this, I would make it so the engine would have to
be running above idle and the charger producing more than the nominal
13.6 volts needed to run the engine. That would mean that each battery
in the 24 volt system would need to be charged a little at a time -
like say a minute for one, a minute for two - back and forth until the
batteries were charged.

That's the way I would do it, but there are other ways. I just can't
find out how it works.

Anybody have experience with these things?

Tom, I'm not really sure without seeing one, but I believe this is a
small transformer and rectifier pack, that allows you to charge 24v
and run 12v accessories. Delco and Leece-neville have been doing this
for years on heavy equipment.

One set of black/red wires ould go to 12v and the other black and red
would go to a 24v bank. one red would probably go to key switch, and
other red go to alternator charge wire.

Not sure, but thats how I see it.- Hide quoted text -

- Show quoted text -

Correction. Black/red 24, blk/red 12, blk/red keyswitch and engine
ground.

or something like that.


I re-read the specs on the Guest unit Tom is referring to. It specifically
says, 2 outputs of 12volts DC, 10 amps each. But then it says for "24"
volt systems. That is confusing.

Eisboch

On Tue, 25 Nov 2008 10:58:19 -0500, "Eisboch" wrote:

I re-read the specs on the Guest unit Tom is referring to. It specifically
says, 2 outputs of 12volts DC, 10 amps each. But then it says for "24"
volt systems. That is confusing.

Yes.

There are two possibilities that I can think of. The first assumes a
12 volt starting battery *and* a 12 volt trolling battery. In that
case it would merely function as a combiner once the starting battery
is fully charged. Combiners have been around for a while and are
just an automated switch with voltage sensing.

The second possibility assumes a 12 volt starting battery but a 24
volt trolling batt. In that case it would have to contain a DC to DC
converter which would activate once the starting batt was at full
voltage. If you already own a 24 volt charger this function could be
implemented by driving it with a 12 volt inverter.

I'd call Guest and get a clarification. On the other hand my
impression of most Guest products is not all that favorable.

On Tue, 25 Nov 2008 16:35:00 -0500, Wayne.B
wrote:

On Tue, 25 Nov 2008 10:58:19 -0500, "Eisboch" wrote:

I re-read the specs on the Guest unit Tom is referring to. It specifically
says, 2 outputs of 12volts DC, 10 amps each. But then it says for "24"
volt systems. That is confusing.

Yes.

There are two possibilities that I can think of. The first assumes a
12 volt starting battery *and* a 12 volt trolling battery. In that
case it would merely function as a combiner once the starting battery
is fully charged. Combiners have been around for a while and are
just an automated switch with voltage sensing.

The second possibility assumes a 12 volt starting battery but a 24
volt trolling batt. In that case it would have to contain a DC to DC
converter which would activate once the starting batt was at full
voltage. If you already own a 24 volt charger this function could be
implemented by driving it with a 12 volt inverter.

I'd call Guest and get a clarification. On the other hand my
impression of most Guest products is not all that favorable.

Well, this has been an interesting discussion - thanks Tim, Eisboch,
Gene and Wayne.

I think I'm going to take Wayne's advice and call Guest about how this
actually works. I'm begining to think that there is a voltage
component to this coming from the charger.

FYI - when I referred to 24 volt system, it's two batteries in series
to power the 24 volt trolling motor.

Thanks for all the replies.

Tom Francis - SWSports wrote:

Thanks for all the replies.

Don't go away yet. ;-)

What motor are you planning on hooking this up to?


--
Regards,
Dave Brown
Brown's Marina Ltd
http://brownsmarina.com/

On Tue, 25 Nov 2008 17:12:20 -0500, Dave Brown
wrote:

Tom Francis - SWSports wrote:

Thanks for all the replies.

Don't go away yet. ;-)

What motor are you planning on hooking this up to?

ETEC 200 HO.

Tom Francis - SWSports wrote:

What motor are you planning on hooking this up to?

ETEC 200 HO.

Check your manual - I think you already have an isolated terminal on
your engine just waiting to be used to charge your trolling motor
batteries. You can patch that through a further battery isolator to
split the charge between your 2 trolling motor batteries and you're off
to the races.




--
Regards,
Dave Brown
Brown's Marina Ltd
http://brownsmarina.com/