red31
Bryan
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Joined: 08/04/2008
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Battery capacity depends on use. That is why the numbers for the 5hr rate is lower than the 20hr rate. 'True capacity' would only be meaningful for a specific useage!!!
BTW, FWIW : I don't have a propane detector.
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professor95
Mechanicsville, VA
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Joined: 10/03/2004
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Mousefart wrote:At what voltage does the propane alarm start beeping? If it starts at a 20% SOC, your test just significantly reduced you battery life, especially if it is a "marine/RV" glorified starting battery.
About 11.5 VDC
Which is one good reason to NEVER use a glorified marine/RV starting battery. There is a direct correlation between cheap and combination when it comes to batteries. If you dry camp often, you learn that quickly. It only takes one cold night when the sail switch on the furnace will not stay up due to reduced fan speed from a dying battery to learn what is and is not acceptable in RV batteries.
On the other hand, if all you ever do is pull in a slideout after you unhook from a campground power pedistal, any battery will do.
Now, why do you NOT have a propane alarm? Without one, how else will you know if your bug spray or Right Guard deoderant spray are any good? 
Professor Randy T. Agee & Nancy Agee. Also Oscar, the spoiled rotten Dachshund, Mechanicsville, VA
2009 Cedar Creek 34SATS 5th Wheel - GMC 3500 dually
Even a bad day camping in our RV is always better than a good day at work!
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Hurricaner
Hurricane Utah
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Joined: 02/17/2007
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The actual amp hour capacity is based on running the batteries down to 10.5 volts.
Sam
Sam & Kari
Hurricane, Utah
2004 34' Damon Challenger 315
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Mousefart
New Jersey
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Joined: 08/15/2004
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Hurricaner wrote:The actual amp hour capacity is based on running the batteries down to 10.5 volts.
Sam
True, the actual capacity as stated on the battery label.
However, this has absolute nothing to do with the USABLE AH capacity, which is around 1/2 the label rating.
If you were to actually drain you battery down to 10.5 volts, you would most likely be left with a useless chunk of lead.
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BFL13
Victoria, BC
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Joined: 02/15/2006
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professor95 wrote:Mousefart wrote:At what voltage does the propane alarm start beeping? If it starts at a 20% SOC, your test just significantly reduced you battery life, especially if it is a "marine/RV" glorified starting battery.
About 11.5 VDC
Ours alarms by flashing orange between 10 and 8v. 8-6v it chirps too; below 6v steady red.
You wouldn't want the LP alarm to be at higher than the inverter's alarm ( 11v and below depending on type) either.
2003 Chev 2500HD ExtCab, LB, 2WD, 6.0/4.10 Gas
2003 Komfort 26FS 5er (28.5 Ft-RK-10,000lb GVWR)
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RVGreen
Houston, TX
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Joined: 10/18/2002
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RJsfishin wrote:BLF13 is right,...you're nuts !
Who cares what the exact AHs are ?
What we care about, is if our battery bank is capable of doing what we want it to do. If its not, you add another battery.
Of course, you don't care about your battery capacity. Even if you did, there is nothing you can do based on your tremendous ignorance. You are the one who needs luck.
Sam (Houston, TX)
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quabillion
Viva Terlingua!!!
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Joined: 08/20/2008
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Just take a look at your fancy battery monitor, it will tell you everything you ever wanted to know.
No monitor??? well then your GUESS is as good as mine.
1850 watts of solar on the roof. 600AH AGM battery bank. Prosine 2kw inverter. EU3000 100% off grid since 6-1-03
If you're not part of the solution, theres good money to be made prolonging the problem.
Master HVAC/R Service Tech for the past 9 years.
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Hurricaner
Hurricane Utah
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Joined: 02/17/2007
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Mousefart wrote:Hurricaner wrote:The actual amp hour capacity is based on running the batteries down to 10.5 volts.
Sam
True, the actual capacity as stated on the battery label.
However, this has absolute nothing to do with the USABLE AH capacity, which is around 1/2 the label rating.
If you were to actually drain you battery down to 10.5 volts, you would most likely be left with a useless chunk of lead.
US Battery says you can do it 500 times http://www.usbattery.com/usb_images/cycle_life.xls.pdf
Sam
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MrWizard
Van Nuys, Ca
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Joined: 06/27/2004
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Mousefart wrote:If you were to actually drain you battery down to 10.5 volts, you would most likely be left with a useless chunk of lead.
I don't understand why you keep saying that,
you've NEVER EVER left the head lights on, and run down the battery on one of your vehicles, jumped started it and have the battery last for several years after ward ?
even with a starting battery, it won't be ruined by ONE dis-charge cycle
what will kill, is 'running the battery down' by trying to start an engine that won't start, because the heavy currents of the starter will warp the thin plates. forgetting to turn off the headlights will drain it, but NOT kill it.
and deep cycle batteries can do it many times, like 100's of times some very expensive solar batteries can with stand a 1000 or more full discharge cycles.
* This post was
edited 03/29/09 09:59pm by MrWizard *
Options, always have options, and the journey goes much smoother
....
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gmachine
Marion,IN & Chuluota,FL, USA
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Joined: 03/11/2002
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Nothing to do with battery posting.
MOUSEFART! MY GRANDKIDS SAY "THANKS FOR THE ANIMATION".
Bering MD23(Cummins ISB)w/60" flattop Kenworth sleeper & 2005 Excel 35MKO Limited, 2006 Scion XA.
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