I equalized two of my 6v gc's with the cps 1620.
Nice accurate toggling; coarse, fine, extra fine. You can adjust the voltage by the hundredths, tenths, singles, and tens of volts by simply pushing the adjuster knob to light up the digit range. Amps same thing, but to the tenths.
In series, after doing a top charge the previous evening, the batts were resting at 12.79v; individually at 6.40 (A) and 6.39 (B). I set the 1620 at 8v and 10.7a for a single 6v/215Ah battery, and did a 3 hour EQ on each separate battery.
Battery A:
Voltage rose rather quickly to 8v, with unit in c.c. mode. After a short while, amps began to taper, and unit switched to c.v. mode. About 2 hours in, amps began to rise back up, from about 8 amps, back to 10.7a (a thermal issue, I'm presuming?). Then voltage began to drop to 7.87v in c.c. mode, by the end of the 3 hour charge.
After resting a few hours, while the other 6v was being EQ'd, S.G. readings went from 1.290, 1.285, *1.275* (pre EQ) to 1.290, 1.280, *1.280*. After another hour and a half of EQ, and a three DAY rest, S.G. readings tightened up to 1.285, 1.280, *1.280*. But, as with every higher voltage charge I do, the resting voltage had dropped, in this case from 6.40v (pre EQ) to 6.36v? (And yes, I do realize there was still some surface charge, but please see comparison in last paragraph).
Battery B:
Basically the same profile, but the amps began to rise back up after only about one hour, to 10.7a, and 7.93v c.c. by the end of the charge. After a similar 3 hour rest period, the S.G. readings went from 1.280, 1.285, *1.265* (pre EQ) to 1.285, 1.285, *1.275*. After a similar, additional hour and a half EQ, followed by a 3 day rest, S.G. readings tightened up to 1.285, 1.280, *1.280*.
So, a rather successful EQ it seems. I will keep an eye on the *two* cells' s.g.'s to see if they slide back down.
The weird thing is, before doing these EQ cycles, battery A had always had lower s.g readings, and a slightly lower resting voltage than battery B, but had already started holding higher s.g.'s and resting voltages, after doing a few top charges with the pm4b and Peak. Now, after the EQ, both are holding similar S.G.'s and resting V's. :)
After the 3 day rest, both batts were holding steady at 6.36v, so I wired them back up in series. Today, a total of 6 days later, they're each holding their own, equally, but at an even lower resting V of 6.35?
One thing I have noticed, is the larger 430Ah bank seems to hold a higher resting voltage (12.78) than the two 215Ah banks (12.76), which in turn seem to hold a higher resting V than the individual 6v's (6.36 x 2 = 12.72).
