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From: Maurice & Louise-Ann on AKAMA (no email)
Date: Wed Nov 23 2005 - 16:06:10 EST
Well, "cross tie" sounds like a term invented by a non-engineer. When I
went to engineering school we talked only about "series" and "parallel".
As you describe it, the issue is does one put in parallel each half of
the batteries into two big 6-volt banks, and then series those to make a
12-volt battery. Or, does one put in series pairs of batteries to make
a bunch of 12-volt batteries, and then put those in parallel to make a
12-volt bank.
I suspect that this is one of those theoretical questions that is
overweighed in the real world by the practicality of physically locating
the batteries and running the wires. After all, a battery is just a
bunch of cells connected internally, so you are already starting with a
module of cells (each battery) that is wired (internally) in series,
three in a 6-volt battery and six in a 12-volt battery.
IMHO, the most important thing is to make things with as low an IR drop
as possible. Thus, whatever method results in using the shortest amount
of wire of the smallest gauge (i.e., the fattest wire) in the battery
bank would win my vote.
Also, you want things to be as balanced as possible; I recall reading
that batteries farthest from a charger receive less charge than those
closest, even with small gauge wire. Similarly, the closest ones bear
the most load. In other words, the amount of wire that any electron
needs to travel from any battery, out to the 12-volt bus bar should be
equal for all batteries. So, if you parallel a bunch of batteries you
don't want to hook the bus feeder wires to either end, but rather to the
middle. Better still, hook the batteries together in pairs and then
hook those pairs together in parallel, directly at the bus bars. But,
again, this is guilding the lily somewhat, as in the real world you have
to hook things up in a practical (but acceptable) manner.
Cheers,
Maurice
M/Y AKAMA
-----Original Message-----
From: Jim Fidler [mailto:]
Sent: Thursday, 24 November 2005 07:17
To: T&T
Subject: T&T: "Cross-tying" Golf Cart Batteries
In the Prosine Users Guide, Xantrex recommends "cross-tying"
battery banks with series parallel connections.
When using 4 or more golf carts in a 12 volt house bank,
this means connecting half of the golf carts in one parallel
group and connecting the other half in a second group.
Then connect the two 6 volt groups in series for 12 volts.
Do you list members with 4 or more golf carts all use this
technique? I can understand the advantages but are there
any possible problems or disadvantages? Is it always a
good idea (vs. connecting pairs of golf carts in series and
then connecting the pairs in parallel without "cross-tying").
Thanks
Jim Fidler "Fiddlesticks"
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