I have been following this discussion and would like to do this for my batteries. Can you suggest what would be an easy/appropriate ~20A load generating device? Dave
Aries 1990 C&C 34+ New London, CT > On Feb 7, 2017, at 10:15 AM, Della Barba, Joe via CnC-List > <cnc-list@cnc-list.com> wrote: > > Easy cheap way. > If you have accurate volt and amp meters, a 20 amp (or near enough) load > applied for enough time to drain the batteries 50%*. You should see 12.2 for > wet cells and 12.3 or so for gel/agm. > Light loads like 1-5 amps and heavy loads like 50-100 amps both will be > inaccurate because of Peukert’s law. This law deals with the fact that a 100 > AH battery can supply 100 amps for 1 hour or 1 amp for 100 hours in theory, > but in practice 1 amp will last longer than 100 hours and 100 amps won’t make > the full hour. 20 amps is a good value for these tests. > > * (AH capacity of batteries/load in amps) /2 = time in hours for 50% discharge
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