6 volt batteries in series

wa8yxm wrote:


One thing to think about.. When you take two 6 volt batteries and put 'em in series like this:

-{6v}+-{6v}+==== 12 volt

What you have is a SINGLE 12 volt battery.

You put two pair in a series/parallel

-{6v}+-{6v}+==== 12 volt
-{6v}+-{6v}+==== 12 volt

You still have one 12 volt battery (around 450 amp hours).

SNIPPED

You got this right. I read a lot of posts from internet battery experts on here, and they are knowledgeable, but no one ever gets this part correct. I am NOT saying I am an expert.

For a few years I worked with a guy that did PMs on strings in power plants and sub stations. The individual unit is a jar, the entire string is a battery.

When I was working with him, we did batteries up to 250 volts made up of 2 volt jars (which are really just huge 2 volt plastic containers).

That is where the term "jars" comes from, it actually is correct. The testing tools in THAT industry still call the individual cells jars, and the whole group is a string, with the connectors called straps.

Even today I have access to a Midtronics battery analyzer. I do enjoy it, if nothing else just so I can still play with it.

As I said, I am NOT an expert, trust me, MEX knows WAY more about this stuff than I do.

I see in the Bass Pro/Cabelas catalog that they have three types of batteries.starting; deep cycle/starting; and deep cycle.
are you naysayers calling them liars or are you just mistaken.
bumpy

OP?

Matt_Colie wrote:


Trolling motor service is basicaly light duty and the related chargers are not all that powerful. That all works in your favor.

Matt

current trolling motors run up to 36 volt models. so I am advised by my professional consultant. and slamming the troller wide open for a day, then slamming it on a charger overnight for the next day is not "light duty".

I certainly agree however that the majority of the folks do use them in relatively "light" duty. but my main question was concerning the inherent explosion built in when two 12 volters are used in parallel.
bumpy

Bumpyroad wrote:
for the last 60 years fisherpersons have used two 12 volt batteries in parallel to run their trolling motors. I have Never heard of this explosion. I certainly would not take this "fact?" into consideration on my setup.
bumpy

Bumpy,
I have seen one (and only one) explosion in a trolling motor bank of parallel 12V. That happened when the owner tried to use it to crank the big motor on his bass boat.

Trolling motor service is basicaly light duty and the related chargers are not all that powerful. That all works in your favor.

Matt

CA Traveler wrote:
Matt,

How about explosion/issues with 4x 6V for 12V?

I have never seen or gotten paid to clean up after a bank of 6V that had problems.

Matt

wa8yxm wrote:
Not all batteries are alike.

12 volt batteries. most of these are MARINE/deep cycle or MARINE/rv Now Trolling batteries are True DEEP CYCLE.

IMHO, any battery that advertises Cold Cranking Amp (CCA) or Marine Cranking Amps (MCA) is NOT a true deep discharge battery.

CA Traveler wrote:
There are boats and then there are boats. My trawler had 3x 8D batteries, large heavy puppies. Never had a problem but batteries do explode but not to often IFAIK.

Lead acid batteries explode when over charged/over discharged (welding/shorted) and/or the liquid level is low.

CA Traveler wrote:
Most 6V GC batteries used in RVs are 230A giving you 12V at 230Ah. Most 12V RV batteries are about 80Ah giving you 160Ah. Marine deep cycle batteries are a compromise and not much better than starting batteries.

If you buy your batteries at Sams Club or Costco, a pair of GC2 golf cart batteries will cost less and as stated, give you more power.

Lwiddis wrote:
The Trojan J150 is a 12 volt true deep cycle battery for you to consider. 150 AH

http://www.trojanbattery.com/pdf/datasheets/J150_Trojan_Data_Sheets.pdf

Check the price! $$$ OUCH !!