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Old 11-13-2015, 04:05 PM   #31
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The rule about "true" deep cycle batteries not having CCA marked on the outside is no long viable because at least Exide does mark them with a CCA rating. Manufacturers that have dual starting deep cycle batteries frequently mark them as "dual purpose," as Exide does.
I hate to disclaim what my esteemed colleague here says, but actually the argument is opposite to the premise: If a battery is NOT marked with an amp-hour rating, it is not a true deep cycle battery.

Marine batteries are a compromise battery. First, what makes a good starting battery? Lots of thin plates that can deliver a large wallop of amps when demanded. What makes a true deep cycle battery? Fewer thick plates. That construction allows the plates to resist plate erosion for a longer period of time, and enables it to withstand deep discharge. But it does not allow the battery to give that huge wallop of current that a starting battery does. Marine deep cycle batteries are still expected to deliver starting current, but they are also expected to deliver lesser current for a longer time, like to power electric trolling motors. Golf cart batteries, fork lift batteries, off-grid solar batteries and such are not expected to have to start internal combustion engines. They are true deep cycle batteries made with big beefy plates. So that's what is meant when it is said that marine batteries are not true deep cycle batteries.

Sorry. we seem to have gotten off the topic of the post. By the way, I noticed on my recent trip that I need to replace my propane alarm as well. It was going off in the middle of the night on me just because I had baked beans for dinner
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Old 11-13-2015, 04:12 PM   #32
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Sorry. we seem to have gotten off the topic of the post. By the way, I noticed on my recent trip that I need to replace my propane alarm as well. It was going off in the middle of the night on me just because I had baked beans for dinner
Yes, that is tyhe problem with these. they are not very 'smart' to begin with and after about 2 years they age out and are worthless. Safety Alert should be ashamed of themselves.
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Old 11-13-2015, 04:32 PM   #33
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marine batteries are not true deep cycle batteries.
In the case of Exide, it is a true deep cycle, meant to run motors. It is not meant for starting at all.
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Old 11-15-2015, 05:33 PM   #34
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... By the way, I noticed on my recent trip that I need to replace my propane alarm as well. It was going off in the middle of the night on me just because I had baked beans for dinner
OK, done! Ten minute job. The old one was dated March 2011. It's supposedly a 2012 model year trailer but it was probably built mid-year 2011. The new one cost $88.69 with tax from Amazon and was dated Sep. 8, 2015. Safe-T-Alert model 35-742BR Brown. Now I can fuggedaboudit it for the next couple of years I guess.
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Old 11-15-2015, 08:44 PM   #35
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OK, done! Ten minute job. The old one was dated March 2011. It's supposedly a 2012 model year trailer but it was probably built mid-year 2011. The new one cost $88.69 with tax from Amazon and was dated Sep. 8, 2015. Safe-T-Alert model 35-742BR Brown. Now I can fuggedaboudit it for the next couple of years I guess.
Hope mine will be as easy, also figure it is from 2011 as my unit is a 2012 Flagstaff T12RB. Son will get to it one of these days, hopefully before Spring.
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Old 11-16-2015, 10:43 AM   #36
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addressing this to the post by kdot regarding how to read % of charge based on volts...

The percentages you post are different from two other posts I've seen on these forums (see attached)

Can you comment on the differences in your numbers?
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Old 11-16-2015, 11:30 AM   #37
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Propane Alarm

Quote: addressing this to the post by kdot regarding how to read % of charge based on volts...

The percentages you post are different from two other posts I've seen on these forums (see attached)

Can you comment on the differences in your numbers?)

Nope.
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Old 11-16-2015, 04:57 PM   #38
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sorry...my question to kdot was poorly worded...(I did not expect a comment on the other tables found in these forums)

Can you provide the source of your numbers?
Are the numbers based on a closed circuit or open circuit?
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Old 11-16-2015, 05:33 PM   #39
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Propane alarm

nstearns, the figures were given to me by the guy who taught an auto maintenance course at our local tech school. That's all I remember about it.

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Old 11-17-2015, 03:29 PM   #40
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I'm going from memory, but I don't see much difference between tables. 50% charge - probably the most important voltage - I've seen pegged at 12.07 and 12.10 - can your meter accurately tell the difference? Current battery loading and/or charging in the past 12 hours will affect voltage reading. Meter impedance differences (amount of load the meter puts on the battery) can also affect the third and fourth decimal places.

Real world is try to keep your battery bank at 12.1 volts or better for decent life expectancy. This assumes no charging in the past 12 hours. If you have load attached while measuring voltage, keeping above 12.1 volts means you are at better than 50% charge for even longer life.

The only real way to accurately know battery state while camping is a device that measures amp-hours in and out. These devices are not cheap, and use the voltage across a known value series resistor to do the measuring.

For the rest of us, having a reasonable guess at amp-hours used and trying to stay above 50% charge by voltage reading is sufficient. You won't squeeze every bit of life out of your batteries that the real battery monitors do, but I have more things while camping than monitoring batteries. I accept replacing batteries every 4-5 years as the cost for my lack of concern.

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