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Doug,
I know you will have problems if you wire it as you
"Parallel - Series" version because what you will end up with is two battery
chargers in parallel connected to two batteries in parallel.
I may be missing something but I don't see why
your "Series - Parallel" version won't work. That's the way I'd go if I
wanted them connected together.
On my sub I kept the two 36 volt banks
separate. Normally I use one for the side thrusters and the other for the
rear thrusters. If I drain one, I still have some power in the second
bank. Or if something happened to one I have a second bank to
use. I hooked them up with sixty amp electric range plugs and outlets so I
can switch them easily. The range receptacles also double as charging
ports. My rear thruster is eighty amps but it's used intermittently
on full power.
Dan H.
----- Original Message -----
Sent: Saturday, October 27, 2007 5:52
PM
Subject: Re: [PSUBS-MAILIST]
Series-Parallel OR Parallel-Series
Thanks Dan Let me see if
I understand you correctly.
If I take 3 of the batteries and
wire them in series, and then wire the other 3 in series and finally wire to
two sets in parallel.
Top
Image: http://www.submarineboat.com/sub/images/battery.jpgI'll still be able to measure 12 volts
across any of individual batteries so so I am able to connect a separate 12
volt battery charger directly to each battery. I hope that is right
because that makes sense to me now. And that is fine because having two
Pro3 Chargers I do have 6 separate 12 volt chargers with a total of 30 amps
charging capability which I wanted in order to shorten the charging
time.
If on the other
hand I divide the 6 batteries in to pairs that are connected in parallel, and
then connect those 3 pairs in series,
(Bottom Image: http://www.submarineboat.com/sub/images/battery.jpg
)
I would have a
problem connecting 6 chargers because the paired batteries are going to show
an average of their voltage.
If that is true then the tech had it
backwards and I get to wire them the way I wanted in the first place.
Scary thing is that I was talking to a technical support person and not the
sales guy.
Let me know if I have this wrong, I was going
to start cutting wire tomorrow.
Thanks
Doug
J
-----Original Message-----
From: Dan. H.
<jumachine@comcast.net>
To: personal_submersibles@psubs.org
Sent:
Sat, 27 Oct 2007 9:06 am
Subject: Re: [PSUBS-MAILIST] Series-Parallel OR
Parallel-Series
Doug,
I don't know about the proper
terminology Series-Parallel or
Parallel-Series. But then, I wouldn't put a lot
of faith in that salesman either.
From what you described of the charger, it sounds
like each of the three sections of the charger are actually separate
chargers. It's like the three separate batteries you have. Even
though you have three hooked in parallel you can still connect three separate
12 volt lights, one to each of them, if you want. If the sources and the
loads are otherwise isolated from each other, it makes no matter that one wire
from each is connected.
The same principal is
used to get 120V from each half of a 240V line in your house
wiring.
That
works fine for series but not on the parallel part. As
you know, in parallel, you have two
wires from each battery connected to the next, so they are no longer
isolated. That's where the GOOD SALESMAN comes in. You say you
bought both chargers as he said you should? Yep! Maybe GREAT
salesman. I'd talk to their tech folks and find out how the sales guy
works his magic.
I bet they tell you can't hook it up that way,
with the two chargers, because they won't sense the batteries condition
properly.
Dan H.
-----
Original Message -----
Sent:
Friday, October 26, 2007 10:39 PM
Subject:
[PSUBS-MAILIST] Series-Parallel OR Parallel-Series
I have eight, 12 volt
batteries. Two are connected in parallel for the starter and other 12
volt stuff and the other six need to be connected in either Series-Parallel
or Parallel-Series. To me, Series-Parallel is connecting 3 batteries
in series and then connect that in parallel to the other 3 batteries that
are also connected in series.
A picture will help: http://www.submarineboat.com/sub/images/battery.jpg
I want to connect them in Series-Parallel because its less wire
and fewer connectors with two cables, however the tech at www.dualpro.com where I purchased my Three Bank
Pro Chargers told be to connect them in parallel as pairs and then connect
the pairs in series, or what I think should be referred to as
Parallel-Series. He was unyielding on his view but also unwilling or
unable to explain why.
So is there any difference between
Series-Parallel and Parallel-Series?
And all the tech would tell me
about how the Pro3 charger worked, was that it electronically isolated the
batteries so that disconnects were not needed. Can someone please
explain that bit of magic? The Three Bank Pro3 charger has 6 leads or
a positive and negative for each of 3 batteries. I have 2 of these
Three Bank Pro3 chargers so
I can charge all 6 batteries in the 36 volt supply.
Thanks for the
help.
Doug Jackson
Tulsa, OK
www.submarineboat.com
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