Cheap Reliable Battery Load Testing
https://www.harborfreight.com/500-amp-carbon-pile-load-tester-91129.html Bulletproof way to test wet and AGM batteries Like a hospital heart stress test EDIT: Fixed the URL.
Forum Discussion
MEXICOWANDERER wrote:
I also have 5 digit volt meters and 3 separate ammeters. Two inductive including a Fluke and one shunt type which uses a 1000 ampere shunt 100 mv Manganin type traceable to NIST. The HF is no more inaccurate than an Auto Meter, Sun VAT 40 or Snap On AVR I have used. My unit reads just under .2 volts high at 9.6 VDC. My bench DMM needs decertification again. Last time it has drifted seven ten thousandths of a volt low.
For hand grenade testing it is satisfactory to me. It was a $5,500 purchase in lieu of cash payment.
The validity of my AGM Load testing was approved by Concorde. I do not care to acquire the technique to test lithium batteries.
You are extremely smart when it comes to electronics. What bothers me about you is your "cliff" take on your posts. How many RV'ers have or even know about Concorde AIRCRAFT Batteries. Not me, I had to look them up. Then I find Concorde also distributes LifeLine. Here is what Lifeline states about testing THEIR batteries. Doug
"How do I know when it is time to replace my battery?
Perform a capacity test. Short duration load tests and impedance/conductance measurements are not reliable to determine the actual capacity of a battery".
