Battery Amp Hours
Submitted: Thursday, Feb 26, 2004 at 00:14
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Macca1
Hi all,
I have a 2003 diesel Navara. Does someone know what amp hours the standard factory battery would be, I can't find it any where.
I'm off camping this weekend and am trying to workout how long my Waeco fridge will run on the battery. Waeco advertise the fridge will draw 3.5 amphours but only runs about 30% of the time so effectively _Affordable_Storage_Drawers.aspx about 1.2 amphours.
I also have a generator but can't stand it running all the time. I don't have dual batteries but that's next on the list. I have a Jumpstart battery pack as backup but that's only 17.5 amphours.
Any info would be great.
Macca
Reply By: V8troopie - Thursday, Feb 26, 2004 at 01:18
Thursday, Feb 26, 2004 at 01:18
Macca,
I am curious if your jumpstart battery pack actually could start a cold diesel engine, have you tried it?
Car batteries are usually rated for their cranking capacity, rather than for how many Ah at what current, as deep cycle batteries are. Car batteries expect to be charged after starting the engine, that is perhaps why there is no deep discharge Ah rating on them.
How long your fridge is actually running also depends on the ambient temperature, how full it is and wether you just put something warm inside.
Klaus
AnswerID:
48144
Follow Up By: Macca1 - Tuesday, Mar 09, 2004 at 00:04
Tuesday, Mar 09, 2004 at 00:04
Klaus,
Well I got the flat battery I was looking for on the weekend and guess what. The jumppack, whilst fully charged worked like the flat battery on my diesel. ( your comment about being curious as to whether it would start my diesel had me second guessing from the time I read it until the time I proved it)
Fortunately I heve one of those cheap chinese generators and the battery charger got enough charge into my battery in about 1.5 hours.
The jumppack started my mate's v8 without any problems (yes, we both had flat batteries).
Oh
well, it's back to the drawing board and I think I'll be looking at a deep cycle second battery to run the Waeco so that I don't drain the battery whilst freezing my fish.
Macca
FollowupID:
311395
Reply By: Brett - Thursday, Feb 26, 2004 at 08:26
Thursday, Feb 26, 2004 at 08:26
I think that amp hours are only given for deep cycle batteries.
Most cranking batteries have their cranking capacity in CCA and another wset of characters RC. RC is reserve capacity. I think these numbers indicate the ability of the battery to provide a fixed load for a period of time until the battery reaches 10.4 volts(I think)
If the battery is RC135 then it will be able to provide 20 amps for 135 minutes. Remember this will be a fully charged battery with cool electrolyte and in Lab conditions with a 20something degree ambient temperature.
I used to have a century marine pro hybrid battery in the troopy and could run the FF40 waeco as a freezer for approx 4 days with approx 30-60 minutes vehicle running each day before things started to catch up.
I think this battery had a RC of 130 and the wAECO was set to run down to 9.2 volts.
Brett
AnswerID:
48155