conditions for rebulk to trigger

[jtdiesel65]

Hi,

I'm seeing my 150s apparently doing a rebulk. I have absorb=56.4, float=54.4, and rebulk at 53. This is 1120AH lithium, Sometimes this happens in full sun and no loads that would trigger a voltage drop to 53. Are there other conditions that would cause the controller to drop back into bulk from float?

thx

[Vic]

Hi jt..,

It sure looks like it IS ReBulk which is doing this.

Here is some discussion on this topic:

http://midniteftp.com/forum/index.php?topic=2295.msg21678#msg21678

FWIW,  Vic

[jtdiesel65]

Thanks.

I just don't see how the CCs are seeing 53 v. Anyway, I set rebulk to 24v which should essentially disable it. I'll keep an eye on it to see what happens. Is there a specific setting to disable it?

thx

[ClassicCrazy]

There are three articles on lithium in knowledge base .
http://www.midniteftp.com/support/kb/faq.php?cid=1
They talk a bit about rebulk in there.
I just got a jakiper lithium battery but haven't gotten it hooked up yet.
Look in Lithium Batteries section of forums here
Steve S has written about his lithium setpoints for Classic .

Larry

[FNG]

Bulk can also be triggered by a new day, Make sure your clock is set correctly. I have seen a lot of people get tripped up and set say 2PM for 2:00 not 14:00

[jtdiesel65]

The clocks were off. I reset the CCs when I moved to LFP. I must have not set the clock. The day was off as well. Looking at mymidnite, it appears they enter bulk at ~11:40AM.   Mymidnite must translate the timestamps it gets to correct time. 11:40AM mymidnite (actual) time is 23:59 CC time. So maybe that explains it. It's a new day.  Interestingly, many days you don't even see double bulk cycles because it's low light and the CC is in bulk when the CC hits the day transition.

So I changed rebulk and the clock and we'll see what happens. Supposed to be sunny today.

thanks!

[boB]

I  *thought* that the Classic also restarted a Bulk/Absorb if there was at least 3 hours of darkness and PV voltage below battery voltage but maybe I am remembering wrong.

boB

[FNG]

I  *thought* that the Classic also restarted a Bulk/Absorb if there was at least 3 hours of darkness and PV voltage below battery voltage but maybe I am remembering wrong.

boB

My recolection was:

If clock looked correct IE the year was greater than 2000 ish then it starts a new bulk at 12:00
If clock looked wrong IE the year was less than 2000 it would start a new bulk 2 hrs after the last charging for the day

I may be off on the year but thats what I recall from 10 years ago lol

[jtdiesel65]

It hasn't done it again. So hopefully it's fixed. 

I think two things were going on. The clock was off so a new day started at 11:40. And then overnight, battery voltage dropped below 53v which was what rebulk was set at. So in the morning, it's in bulk because of rebulk and then at 11:40 it drops to bulk because it's a new day. This is only on sunny days. On cloudy days you wouldn't see any different behavior from correct settings because the CCs are still in bulk at 11:39.

thanks for the help!