Charging 24 volt trolling batteries with a 12 volt system.
 

On Aug 19, 9:23*am, BeachBum "not a wrote:
On 8/19/2011 8:01 AM, Tim wrote:









On Aug 19, 12:00 am, *wrote:
"Tim" *wrote in message

....

This has always been a problem with running a 24v system and expecting
it to charge from a 12 v engine battery.

I suggested *running a battery isolator connected to a third battery
(house battery), a 2000w mod. sine wave power inverter to step up from
12v DC to 120v AC,then using the 120v charger to fill the trollers
BTW, the charger would be 24v, supplying each battery (2-12v series)
@10a. each . I had it all drawn out, but the 'client' didn't want to
disturb his origional engine wiring to install the battery isolator.
No problem, after all it's his boat and not mine. Evidently it
wouldn't be do-it-yourself friendly enough for him, besides extra
weight and equipment etc, etc....

Then just recently he sen't me a link to this:

http://atkinsonelectronics.com/manuf...fs/MBCM-24.pdf

After reviewing the products schematic, I gave my opinion. FWIW

"I like it. I like everything about it. *I see exactly what they're
doing and it makes a lot of sense. The trolling batteries are now
independent *and the unit itself does the switch over instead of
having them hard wired in series with each other. I studied out the
first two tables, and it's simple to install. no modification to the
original wiring harness is necessary. Just a bolt-on operation. *plus,
if necessary, you can jump start the engine battery from the trollers
if need be.

I dont' know how much extra is the 'auto-start' feature is,and I don't
know how necessary it would be but I thought that was cool too.
Batteries get low and you can have the engine start itself for
charging. Of course, the start up engine noise might scare off some
fish at the wrong moment, but....

Also, I'm not sure how much of a charge rate you'd actually get in the
trollers if you're only running a short distance. If you're only out a
couple miles out and run the trollers flat, I'm not sure if running
back that two miles would give a sufficient charge to them, because
now you're maintaining 3 batteries, instead of one. *but then again.
it's trial and error on that part.

But I think these guys are on to something, and no more than it really
costs I don't think you could go wrong with it.

Just my simple opinion. and thanks for the link. it's interesting!"

Tim

So... I did some more looking around and have found that these have
some pretty good independent reviews. Not mere company propaganda.

So if you're trying to charge 24v out of 12v. this might be the way to
go.

Jsut thought I'd pass this along.

Reply:
If you are going to generate 110v from the engine to run a charger, just buy
a charger than will handle 2 12 volt batteries. *Just clip the leads to each
battery. *Bass Pro, Cabela's all carry multibank chargers.

Bill, the guy already had a 24v charger that came with the trolling
motor, the problem was that he didn't have shore power, so he had to
haul out the batteries and charge them which was a pretty good
distance.

Yo Tim,
Looks like you are planning to charge the deep cycles with your
alternator. It's probably going to take quite a bit of engine run time
to charge the deep cycles. Will your client be putting in enough engine
hours to do the job between uses of the trolling motor?

That's a good question and that's what I mentioned in the return email
to him. If simply going out for a couple miles, I didn't think it
would have a good recovery rate on ultra-low trolling batteries, but
his outboard motor alt. is rated for 65a. (so he says,- I don't know)
and on a short run it might be ok, but that's just a guess. after a
day of fishing, he might want to take it out and do a good run or so
to build the batteries back somewhat. OR, not trolling around till the
prop quits... LOL!

Charging 24 volt trolling batteries with a 12 volt system.
 

On Aug 19, 7:24*am, stp wrote:
On Aug 19, 8:01*am, Tim wrote:









On Aug 19, 12:00*am, "Califbill" wrote:

"Tim" *wrote in message

....

This has always been a problem with running a 24v system and expecting
it to charge from a 12 v engine battery.

I suggested *running a battery isolator connected to a third battery
(house battery), a 2000w mod. sine wave power inverter to step up from
12v DC to 120v AC,then using the 120v charger to fill the trollers
BTW, the charger would be 24v, supplying each battery (2-12v series)
@10a. each . I had it all drawn out, but the 'client' didn't want to
disturb his origional engine wiring to install the battery isolator.
No problem, after all it's his boat and not mine. Evidently it
wouldn't be do-it-yourself friendly enough for him, besides extra
weight and equipment etc, etc....

Then just recently he sen't me a link to this:

http://atkinsonelectronics.com/manuf...fs/MBCM-24.pdf

After reviewing the products schematic, I gave my opinion. FWIW

"I like it. I like everything about it. *I see exactly what they're
doing and it makes a lot of sense. The trolling batteries are now
independent *and the unit itself does the switch over instead of
having them hard wired in series with each other. I studied out the
first two tables, and it's simple to install. no modification to the
original wiring harness is necessary. Just a bolt-on operation. *plus,
if necessary, you can jump start the engine battery from the trollers
if need be.

I dont' know how much extra is the 'auto-start' feature is,and I don't
know how necessary it would be but I thought that was cool too.
Batteries get low and you can have the engine start itself for
charging. Of course, the start up engine noise might scare off some
fish at the wrong moment, but....

Also, I'm not sure how much of a charge rate you'd actually get in the
trollers if you're only running a short distance. If you're only out a
couple miles out and run the trollers flat, I'm not sure if running
back that two miles would give a sufficient charge to them, because
now you're maintaining 3 batteries, instead of one. *but then again..
it's trial and error on that part.

But I think these guys are on to something, and no more than it really
costs I don't think you could go wrong with it.

Just my simple opinion. and thanks for the link. it's interesting!"

Tim

So... I did some more looking around and have found that these have
some pretty good independent reviews. Not mere company propaganda.

So if you're trying to charge 24v out of 12v. this might be the way to
go.

Jsut thought I'd pass this along.

Reply:
If you are going to generate 110v from the engine to run a charger, just buy
a charger than will handle 2 12 volt batteries. *Just clip the leads to each
battery. *Bass Pro, Cabela's all carry multibank chargers.

Bill, the guy already had a 24v charger that came with the trolling
motor, the problem was that he didn't have shore power, so he had to
haul out the batteries and charge them which was a pretty good
distance.

What about this? $100

http://www.yandina.com/Troll24Help.htm

I agree. As Wayne said, it's about the same thing. But without reading
the total FAQ, I don't know if they offer an 'auto-start' if the
trolling batteries get really low.

Another thing I liked about the system he pointed out is the jump
start feature for the engine. If the trollers are up, the box can kick
them over to 12v, and jump the engine battery.

So, it seems to me that with his system he's running 3 independent 12v
batteries, and the 'box' switches the 2-12v. auxiliaries over to 24
for trolling use, totally isolating the engine battery to stay full
charged, then will revert back to 12v, for charging the auxillary
batteries when needed

Charging 24 volt trolling batteries with a 12 volt system.
 

On Fri, 19 Aug 2011 15:31:19 -0700 (PDT), Tim
wrote:

Yo Tim,
Looks like you are planning to charge the deep cycles with your
alternator. It's probably going to take quite a bit of engine run time
to charge the deep cycles. Will your client be putting in enough engine
hours to do the job between uses of the trolling motor?

That's a good question and that's what I mentioned in the return email
to him. If simply going out for a couple miles, I didn't think it
would have a good recovery rate on ultra-low trolling batteries, but
his outboard motor alt. is rated for 65a. (so he says,- I don't know)
and on a short run it might be ok, but that's just a guess. after a
day of fishing, he might want to take it out and do a good run or so
to build the batteries back somewhat. OR, not trolling around till the
prop quits... LOL!

====================

In the long run he will need more recharge time. Probably some sort
of small generator or a large bank of solar cells is the right answer
if he doesn't have shore power available. A wind generator might work
also if he's in an area with good breezes.