PD4655 Charging Graph
I have been reading quite a bit about different converters and charge rates, specifically some claims that PD's seem to drop off earlier than other brands. That is not what I have noticed on my setup,...
Forum Discussion
KendallP wrote:
Here's a chart that many of us here consider to be the best approximation of states of charge. Note the difference at 80F between wet to the left and AGM the right. I would estimate you started at somewhere either side of 37.5% SOC. If I'm right, with your modest charge rate, you would have been in bulk for quite a long time. This is consistent with your results IMO.
It doesn't match my mfgr data, I think I'll stick to what the manufacturer put out.
KendallP wrote:
AGMs simply operate at higher voltages. Period. If you draw one down to 12.2V, IMO, you are probably in the neighborhood of 40% SOC.
They are 100% at higher, but at least for my batteries, they hit 50% at the same voltage. I know your opinion differs, but it's an opinion without any fact to back it up.
I would guess I was even higher than 50%, as I was at 12.21V with only 1 hour of rest and not the 4 that Lifeline wants.
http://www.lifelinebatteries.com/manual.php
http://www.lifelinebatteries.com/manual.pdf Revision D is less than 90 days old.
Page 30 of the 2nd link has some good info, and doesn't appear to be arbitrary but from testing. The 120hr rate is higher than my static load from appliances, again pointing to a slightly higher than 50% SOC.
KendallP wrote:
Have we really solved the OP's question about why his chart went well over 100%?
It was discussed on page one. It is because I was simply adding, and averaging with a directly linear equation, the amp hours going into the battery. There is going to be some loss, especially as the batteries approach 100%
KendallP wrote:
Another important note: The batteries are not at 100% at the end of this test.
.
Nope, not sure why that's important thou?? I was still pushing 4A when I went to bed that night, Lifeline says I need to be below 1.5A to be at 100% and that takes several hours more. It takes about 12-15 hours to get the ammeter to read ± 0.0. The test was not a time to 100%, rather showing that my PD4655 will push 55A until the voltage on the circuit board hits the set point of 14.47. It does, and that took ~90 minutes.
Most battery charging while boondocking is not to 100%, it just takes too long for everyday use.
