Text only | Text with Images

A Forum run by Enthusiasts of MidNite Solar

Charge Controllers and Clippers => The "Classic" charge controller => Topic started by: dRdoS7 on February 12, 2014, 09:34:55 PM

Title: Strange Battery Current drop.
Post by: dRdoS7 on February 12, 2014, 09:34:55 PM
Hi,

I was just checking my emails. I got 2 from my inverter, one that Power had been Restored, then another stating it had Failed. It is a bit cloudy today, but unusual for it to switch to grid supply at lunch time. I checked the LA  graph and noticed the value for Battery Current had dropped to zero. I did an export of all values, checked the data and the values I see that are high were FET & PCB Temperatures.

Data export:
Quotedatestamp    timestamp    Battery Voltage   Input Voltage   Battery Current   kWh   Watts   Input Current   Total kWh   Total Amp Hours   Battery Temperature   FET Temperature   PCB Temperature   Charge Stage
13/02/2014 12:09:48   1392253787572   52.7   116.4   15.4   1.6   816   7.1   2465.5   26608   24.8   47.8   48.1   4
13/02/2014 12:09:50   1392253789572   52.7   116.4   15.4   1.6   816   7.1   2465.5   26608   24.8   47.8   48.1   4
13/02/2014 12:09:52   1392253791572   52.7   105.1   14.6   1.6   772   7.2   2465.5   26608   24.7   47.2   48   4
13/02/2014 12:09:54   1392253793572   52.7   105.1   14.6   1.6   772   7.2   2465.5   26608   24.7   47.2   48   4
13/02/2014 12:09:56   1392253795572   52.7   105.1   14.6   1.6   772   7.2   2465.5   26608   24.7   47.2   48   4
13/02/2014 12:09:58   1392253797572   52.7   105.1   14.6   1.6   772   7.2   2465.5   26608   24.7   47.2   48   4
13/02/2014 12:10:00   1392253799572   52.7   105.1   14.6   1.6   772   7.2   2465.5   26608   24.7   47.2   48   4
13/02/2014 12:10:02   1392253801572   52   139.4   0   0   0   0   2465.5   26608   27.3   56   57.2   0
13/02/2014 12:10:04   1392253803572   52   139.4   0   0   0   0   2465.5   26608   27.3   56   57.2   0
13/02/2014 12:10:06   1392253805572   52   139.4   0   0   0   0   2465.5   26608   24.9   47.4   48.9   0
13/02/2014 12:10:08   1392253807572   52   139.4   0   0   0   0   2465.5   26608   24.9   47.4   48.9   0
13/02/2014 12:10:10   1392253809572   52   139.4   0   0   0   0   2465.5   26608   24.8   45.8   47.7   0
13/02/2014 12:10:12   1392253811572   52   139.4   0   0   0   0   2465.5   26608   24.8   45.8   47.7   0
13/02/2014 12:10:14   1392253813572   52   139.4   0   0   0   0   2465.5   26608   24.8   45.4   47.5   0
13/02/2014 12:10:16   1392253815572   52   139.4   0   0   0   0   2465.5   26608   24.8   45.4   47.5   0
13/02/2014 12:10:18   1392253817572   52   139.4   0   0   0   0   2465.5   26608   24.8   45.4   47.5   0
13/02/2014 12:10:20   1392253819572   52   139.4   0   0   0   0   2465.5   26608   24.8   45   47.4   0
13/02/2014 12:10:22   1392253821572   52   139.4   0   0   0   0   2465.5   26608   24.8   45   47.4   0
13/02/2014 12:10:24   1392253823572   52   139.4   0   0   0   0   2465.5   26608   24.8   45.1   47.4   0
13/02/2014 12:10:26   1392253825572   52   139.4   0   0   0   0   2465.5   26608   24.8   45.1   47.4   0
13/02/2014 12:10:28   1392253827572   51.9   138.6   0.8   0   41   0.2   2465.5   26608   24.7   45.6   47.7   4
13/02/2014 12:10:30   1392253829572   51.9   138.6   0.8   0   41   0.2   2465.5   26608   24.7   45.6   47.7   4
13/02/2014 12:10:32   1392253831572   52.4   117.7   15.4   0   811   7   2465.5   26608   24.8   46   47.8   4
13/02/2014 12:10:34   1392253833572   52.4   117.7   15.4   0   811   7   2465.5   26608   24.8   46   47.8   4
13/02/2014 12:10:36   1392253835572   52.6   118   15.5   0   819   7   2465.5   26608   24.7   46.1   47.8   4
13/02/2014 12:10:38   1392253837572   52.6   118   15.5   0   819   7   2465.5   26608   24.7   46.1   47.8   4
13/02/2014 12:10:40   1392253839572   52.8   117.6   15.5   0   823   7.1   2465.5   26608   24.8   46.3   48   4
13/02/2014 12:10:42   1392253841572   52.8   117.6   15.5   0   823   7.1   2465.5   26608   24.8   46.3   48   4
13/02/2014 12:10:44   1392253843572   52.9   117.8   15.5   0   823   7.1   2465.5   26608   24.8   46.5   48   4
13/02/2014 12:10:46   1392253845572   52.9   117.8   15.5   0   823   7.1   2465.5   26608   24.8   46.5   48   4
13/02/2014 12:10:48   1392253847572   52.9   118   15.5   0   824   7   2465.5   26608   24.8   46.7   48.1   4
13/02/2014 12:10:50   1392253849572   52.9   118   15.5   0   824   7   2465.5   26608   24.8   46.7   48.1   4

There were also another couple of rows where the same current drop occurred, but temps didn't jump up.

Are these temps too high? Strange it was just a quick jump up then back down. Did the high temps cause the MN Classic to shutdown?

It's a cool day (22C) with full and light, unbroken cloud cover. At the moment (13:30 AEDST) getting about 1kW from a 3kW system.

Thanks,

dRdoS7
Title: Re: Strange Battery Current drop.
Post by: zoneblue on February 12, 2014, 11:56:52 PM
Those temps arent bad. Vpv goes up, charge stage to 0, ie sleep.  For about 20s. Looks consistant with a watchdog reset maybe. ie controller reboot.  Bob or Ryan will know more. Happens here about once every couple of weeks at odd intervals.
Title: Re: Strange Battery Current drop.
Post by: boB on February 13, 2014, 03:51:09 AM

Had to look closely to follow the columns but yes, it looks like it has reset because the kW-Hours went to 0 after
the 0 amps and watts and input V going to Voc  (139 V).

I'm not sure why the temperature rose 10 degrees there but those temperatures are not that bad (not too high).
Interesting that they jumped up though.

We are still working on the WDT reset issues and getting closer.

boB
Title: Re: Strange Battery Current drop.
Post by: dRdoS7 on February 13, 2014, 06:01:40 AM
Hi,

OK.

Thanks,

dRdoS7
Text only | Text with Images