IOTA graph vs PD graph
OK, I came across two graphs posted here. Both happened to be in Salvo posts but I think one originated with Bigfootford. ANYWAY... I'm sure each graph has been discussed and dissected on its own...
Forum Discussion
Salvo wrote:
Gut feels or speculations are difficult to apply. As I said before, you need to measure your own system. Most PD users are reluctant to do that. If you're running a gen then it's a worthwhile exercise.
As I mentioned, if you're only interested in a 2 hour charge then you can raise the absorption voltage on the Iota to 14.3V. The PD doesn't climb to 14.3V until 90 minutes into the charge. If it was designed correctly it would have gotten to 14.4V long before.
What converter do you have? Lets see some measurements.
BTW, the Costco GC2 batteries in my test are not rated 225AH but 208AH. No 30% difference.
How do you change the absorption voltage on the IOTA? Does said change also affect the float voltage?
I have a WFCO 55. I have the numbers but they are not worth posting. Well, heck:
Time Amps
0:08 21.5 Vconv 13.56 Vbat 13.48
0:20 20.0
1:00 16.5
1:30 13.9
2:00 12.4
2:30 10.7 Vconv 13.61 Vbat 13.56
3:00 9.7
4:15 7.6
5:15 6.4
6:00 5.8
6:45 5.0 Vconv 13.65 Vbat 13.63
8:40 3.4
Those were on 2x Grp 27, approx 210 AH, starting at approx 50%. (I had drawn 5A steady for 20 hours to prepare them for the charging test.)
Not stock wiring! The stock wiring was more like a half volt drop at 15A. :)
