Good Sam Club Open Roads Forum: Tech Issues: Cheap Reliable Battery Load Testing
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Open Roads Forum  >  Tech Issues

 > Cheap Reliable Battery Load Testing

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MEXICOWANDERER

las peñas, michoacan, mexico

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Posted: 12/23/20 10:31pm Link  |  Quote  |  Print  |  Notify Moderator

Best 55 diagnostic bucks a person will ever spend. Will NEVER pass a battery with problems and will find batteries with beautiful specific gravity yet bad. I Jjust load tested my 9 year old AGM by loading it to 500 amps @ 9.9 volts. That's 1000 CCA

StirCrazy

Kamloops, BC, Canada

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Posted: 12/23/20 11:44pm Link  |  Quote  |  Print  |  Notify Moderator

I bought one of these 15 years ago, still works perfect. it is just from the comercial manufacture instead of a chinese knock off.

Steve


2014 F350 6.7 Platinum
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Veebyes

Bermuda & Maryland Eastern Shore

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Posted: 12/24/20 06:15am Link  |  Quote  |  Print  |  Notify Moderator

Well worth the few $ that they cost. Test anytime anywhere.


Boat: 32' 1996 Albin 32+2, single Cummins 315hp
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Seekonk Ma.

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Posted: 12/24/20 06:44am Link  |  Quote  |  Print  |  Notify Moderator

5x, I bought one 4 years ago. Helps eliminate most of the guess work. Great tool.


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CA Traveler

The Western States

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Posted: 12/24/20 08:43am Link  |  Quote  |  Print  |  Notify Moderator

How do you test a deep cycle battery with a carbon pile tester? My 6V Lifelines have a 220 Ah rating at a 20 Hr rate. Apparently 3x or 660 Ah should be used and the Clore Solar 1876, 1000 A carbon pile tester ($216 on Amazon) only goes to 320 Ah and hence is limited to 107 Ah batteries.

The Lifelines also have a 1095 CCA rating so can that be used instead? And what do you use for deep cycle batteries that don’t have CCA ratings?


2009 Holiday Rambler 42' Scepter with ISL 400 Cummins
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Bob


MEXICOWANDERER

las peñas, michoacan, mexico

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Posted: 12/24/20 09:11am Link  |  Quote  |  Print  |  Notify Moderator

I have posted how to load test GC220 batteries at least 10 times over 15 years on this forum.

I could do it another 20 times and it will still be ignored or requested "for funzies" It's discouraging.

CA Traveler

The Western States

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Posted: 12/24/20 09:31am Link  |  Quote  |  Print  |  Notify Moderator

Good to know - I found this 12/10/12 post.

http://www.rv.net/forum/index.cfm/fuseac........d/26578587/gotomsg/26579192.cfm#26579192

MEXICOWANDERER

las peñas, michoacan, mexico

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Posted: 12/24/20 09:44am Link  |  Quote  |  Print  |  Notify Moderator

Thanks. Fingers agonizing today

MrWizard

Traveling

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Posted: 12/24/20 01:31pm Link  |  Quote  |  Print  |  Notify Moderator

Traveler .. Where did you get the idea of 3x the AHR capacity,
I did not see that mentioned
A 1000 cold cranking amp start battery, would be tested at 500 amp load, the biggest load my batteries see in use is the MW, with a few lights and the TV, Around 96 amps,
For testing I turn the load knob all the way up, what I want to see is the voltage stay in range then recover when load is removed, since you have to turn the knob , it is Not instant 500amp load, and you can adjust to to a preferred amp load if you want, the tester can handle 500 amps for 15 seconds, that doesn't mean my batteries or yours will supply 500amps into a carbon pile resistive load, that's a load , not a dead short like welding, or a surge like cranking over the engine, starter wiring has very little resistance so it's a high current spike operation , I think the highest amps I have observed while using the tester on the house batteries is 300+, which is over 3x my usual max draw
As stated this is a stress test ,
Watch the voltage and the amps, and the recovery or lack of recovery

Imo whatever it's worth,
for a start battery it has to maintain enough voltage to keep the starter cranking , I don't know what that is
And for house batteries
Not drop below minimum voltage for inverter use
Inverter runtime testing has been done by many members ,
Seems like BLF does a lot of this, and reports on it frequently, the rest of us don't have to do it, we just read his posts,
This tester gives us a way test batteries before install, and a way to test monitor degradation as they age, and trouble shoot problems when they arise


Radiate The Happy
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1997 F53 Bounder 36s


MEXICOWANDERER

las peñas, michoacan, mexico

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Posted: 12/25/20 11:51am Link  |  Quote  |  Print  |  Notify Moderator

I had a friend who loved to spout E=MC2 theory about uncomplicated problems in his anchored 65' motor yacht. After enduring yet another rave about why his widely spaced parallel connected battery bank was misperforming, I connected my AUTOMETER 1000 amp carbon pile load tester to the end bussbar and cranked it up to 400 amps.

"Yahhhhhh! SMOKE!" he yelled.
As he raced past me, fire extinguisher in hand I yelled after him. "And there, is your problem"

For the next year or so before I moved away, I heard not one more peep about ground loops, and charger peak inverse voltages.

So, it's Take Your Pick
Discover a weak battery today and then allow time to deal with it comfortably

Or do Breakdown Maintenance at 200% the cost.

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