Absorb cycle is too short

[ClassicCrazy]

If you look at that graph I posted of Mymidnite -- the only load I have on that system now is a refrigerator and you can see during the night when the compressor cycles on and off for it.
Larry

[Westbranch]

One full day in and it is a 'classic'....  see for your self, the precipitous drop at ~ 16:17 is when the sun went down... well, behind the mountain, for the day

[Resthome]

Erik

It appears that the voltage stay the same even after the current drops off. Does it go to Absorb and then Float?  I don't see the drop of in Voltage until the end.  I must be miss reading the chart.

[Westbranch]

Erik
It appears that the voltage stay the same even after the current drops off.

Corrrect, it is up and down a few tenths of a volt

Does it go to Absorb and then Float?

It looks like it goes into FLOAT but  the drop in Amps is due to only reflected light keeping the volts up... plus the WBjr is set to 0.0 for EA and the 4 hr ABSORB was not met at the time of the drop

I don't see the drop of in Voltage until the end.  I must be miss reading the chart.

I believe the V drop is the normal load of the fridge kicking in , and /or the drop in ambient reflected light as well.  We left for town today at ~14:00 and it was still in BULK when I shut the CPU off ~1:30.  It went into FLOAT at ~17:56 FOR ABOUT 20 MINUTES

[Westbranch]

the Happiness continues!   

Here is the overnight data, at sunrise (08:00) the V sits at 25.2, down from its steady state of 25.4after yesterdays charge.  It went into FLOAT at ~ 09:00! so it was a good day of charging yesterday...

[Resthome]

Eric

Looking good !

I now see that your battery voltage drops off when it shows float time. The roll off of the Amps just seemed abrupt and still was able to hold the absorb voltage. Usually that final amp slope downward is more gradual and ends at a good end amp setting. But I am not all that familiar with AGMs which I think you have.

[Westbranch]

the 3000 ft ridge to the West cuts off the sun about 1630 these days.  here is a partial pic of the 'hill'.... in the background

[Westbranch]

Spent a few days in town, weather bad so no charging showing on the  MM  display, but expected.... headed out this morning  and foggy till after we arrived at ~11:30,  sun came out and lo and behold the problem is back! 

Very short BULK and the into ABSORB....

So I tried a VMM...4 times,  ....  no go with only battery connected,  had to turn on PV switch for any action to take place....? T  his produced what appeared to be a VMM, as some data was transferred but not all, had to do some specific resets via LApp...

Any suggestions as to what might be wrong?? A dead MNGP battery?  a bad install of FW Ver. 2045/2056? 

[mike90045]

Very short BULK and the into ABSORB....

What was the voltage of battery at that time ?  I thought reaching a certain voltage started the absorb counter ?

[ClassicCrazy]

I only have experience with smaller AGM batteries but they can show good voltages even though their capacity is poor. You may want to do a load test on them individually and see how they do - and then watch the voltage of them under charge. The batteries may just be going bad. They can show a good voltage and then when you put a load on them the voltage will dive.

How old are your batteries ?

Larry

[Halfcrazy]

Spent a few days in town, weather bad so no charging showing on the  MM  display, but expected.... headed out this morning  and foggy till after we arrived at ~11:30,  sun came out and lo and behold the problem is back! 

Very short BULK and the into ABSORB....

So I tried a VMM...4 times,  ....  no go with only battery connected,  had to turn on PV switch for any action to take place....? T  his produced what appeared to be a VMM, as some data was transferred but not all, had to do some specific resets via LApp...

Any suggestions as to what might be wrong?? A dead MNGP battery?  a bad install of FW Ver. 2045/2056? 

So are you saying it went to Absorb to early? So it was in absorb with the battery voltage to low?

[Westbranch]

here is a graph from the day before I did the FWupdate to 2056 , on day 2, from left,...

on day2 I did the FW and you can see the benefit just that the morning BULK wasno very ample... day3 there was a great input, up to 40 Amps and then we had poor days, lots of cloud,rain etc... we were in town, monitored weather with Sat images,  and returned yesterday, last day on graph.  Fogged in and then it broke, sun out, scattered cloud,  and watched CC got through Bulk, Absorb but it did not break out of  Absorb as the  4 hr timer did not run out....

When I saw the pattern I did a couple of manual reboots to bulk and VMM's  and saw there was over 500 watts available.
NOTE  the couple of TINY blips on the Amperage line... but it hopped out of bulk pretty fast and into ABSORB with ~ 1 amp

Yesterdays Volts before bulk = 24.1
then ABS = ~29v
then down to 24.0 overnight and right now with ~40 W incoming 23.9 with fridge running...

using |MM data from graphs the low Voltage before charge cycle starts,

from  left to right  24.7, 24.7,25.3, 24.9, 23.8 low, 24.3, 24.2, 24.1, 24.0 V

[Westbranch]

OK its 11:35~ and it just went into ABSORB  .... CC put out  about 24.4 V and 6.4 A , 

and then it went to ABS putting out 2.0 A and 29.2 V

[Halfcrazy]

I would recommend getting ahold of ROy in tech support (I am traveling a lot and makes it hard to follow here and did not want to leave you hanging)

roy@midnitesolar.com

[Westbranch]

thanks Ryan...