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seiders(at)bellsouth.net
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 Posted: Tue May 20, 2008 12:58 pm Post subject: Battery problem |
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Using the lawnmower battery for 550 hrs with no problems. I replace it every other year regardless of it appearing to be in good operating condition. Know of at least 3 other rv drivers doing the same.
Dick
At 04:03 PM 5/19/2008, you wrote:
[quote]Charles Heathco wrote:
| Quote: | | I have to replace batty, rg25xc now near $200. Ive been told that 300 amp cold cranking lawntractor batty would serve just as well. Im not sure, anybody here have experience or knowledge about this? |
I've a little tractor battery in my Grumman ...... which I switch out with a core battery every annual. It's only 4 years old, and since I don't document it  I don't know how long the last one lasted!!!
Linn
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5/20/2008 6:45 AM[b]
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Mark Phillips in TN
Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN
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| Posted: Tue May 20, 2008 7:13 pm Post subject: Battery Problem |
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In a message dated 05/20/2008 6:49:40 AM Central Daylight Time, denis.walsh(at)comcast.net writes:
| Quote: | Not a stupid question. Rather an excellent observation, and a good
prompt for a discussion of battery needs for our RVs. |
>>>
Discussion: One thing I think is often missed is that one should always consider their battery as a "reservoir" of energy, only capable of offering what it has on board. If the alternator goes Tango Uniform shortly after departure, reservoir is depleted somewhat from bringing the mighty Lycoming to life. And if extended cranking prior to departure were the case, (cold temps, hot starts, blown procedure, whatever...) reservoir just might be quite a bit lower than typical. Methinks it wise to consider remaining battery available based on general condition, plus most recent consumption & time recharging in the event of a failure...
Mark
Wondering what's for Dinner Tonight? Get new twists on family favorites at AOL Food.
[quote][b]
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bjudge(at)gmail.com
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| Posted: Wed May 21, 2008 5:26 am Post subject: Battery problem |
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Batteries that crank have completely different reliability tables than
batteries that don't crank. If you are dependent on electrics this is
a significant tid bit.
I've been running 2 PC625 batteries, one starts the engine and the
other is maintained through a 150 A diode and feeds the critical buss.
With electronic ignition the PC 625 is plenty of power for starting
my XP-360 and it is in most cases way too much battery for a backup.
The advantage is the same as other people have been doing for some
time, at some set time interval you dispose of the cranking battery,
move the old emergency battery to its place and buy a new emergency
battery. Some people do it at a year, I'm going to do it at 2 years
since the battery has a 8-12 year design life span. either way you've
got a fresh emergency battery that has never cranked the engine all
the time.
The PC625 is 16 AH, so multiply the number of amps you are dependent
upon by the number hours before you can comfortably land with a
reasonable safety factor and make sure that doesn't exceed 16. Since
the battery didn't crank the engine the capacity should be nearly 100%
at all times. I pretty much ignore the capacity of the starting
battery for contingency scenarios.
With internal battery backup for my GPS and EFIS I can stay upright in
the clouds just running the electronic ignition off the battery for a
greater time than my fuel endurance.
Bill Judge
N84WJ RV-8 240 hrs
rv-8.blogspot.com
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billoves2fly(at)yahoo.com
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| Posted: Wed May 21, 2008 6:28 am Post subject: Battery problem |
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Thew battewry shopuld be used to start you ewngine and then your alternator should be powerful ewnough to run everything.
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