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Hi folks!
On my system, SOC reaches 100% about 1 hour before the end of Bulk while full sun at 10:00. I thought that Bulk could only fill 80% of the battery capacity and that absorption was designed to fill in the remaining 20% and reach fuil SOC. I set BMV with the C20 Ah capacité Where am I wrong?
Hi Lionel, any changes on the Peukert Coeff ? Or in the tail current ?
Michel
Hi Michelg,
No change from the default values
How do you charge your batteries?
Solar? Multi?? B2B??? Mains charger???? Alternator?????
Each of those^ charging sources would require slightly different BMV settings.
Different battery chemistry also require slightly different settings..
Hi Lionel, I just checked my BMV-702, it is using the 3.11 firmware. I will suggest to input again the parameters you usually use on your BMV, if for any reason they are displaying fine, but they are somehow corrupted.
If this does'nt work, you could check you battery bank (2V units ? ) to see if there is 1 or more units whose voltage is not consistent with the rest of them. Also, check the mppt side, to see if there are any changes on it or not. I mean, the mppt can still provide the correct charge (or not) and the BMV detects it in a wrong (or not) way.
I remember I had such issues when installing the BMV and Ihad to modify the Peukert / tail. Since then, there is more or less a difference between the absorption and the 100% SOC in the BMV of 45m/1h, which is acceptable.
Michel
Hi klim8skeptic
Thanks for your questions. Some answers
Charging is done with solar panels. In difficult times, rare, a generator bur rarely more than 2h/week
My batt bank: 12 OPzS 2V open, liquid electrolyte TYS11, 9 years old
Over & Bye
Thanks,
This confirms my programm when I manage to get there (mid april?)
I would wait for the thaw.. I'm soft.
Could the batteries temp ? be stuffing up the SOC??
Hi Michel,
My BMV is BMV 712 and runs on 4.01firmware. I shall do as suggested:
Quite a program to be done when I manage to reach my house, prently under 1m of snow with a 1.5 hour run on snowshoes..
1m of snow => so temperature is low, this could also prevent the batteries to charge correctly. Take a look at : https://batteryuniversity.com/learn/article/bu_503_how_to_calculate_battery_runtime
Currently I can't check my Peukert value, but I remember that I did a change on it, not sure if 1.25 or 1.30... You could also run an equalization, as the symptoms seem to be related to sulfation.
Hard to get to your place, so better to have a full list of steps to do, there is an article written by Steven from Rolls about issues with sulfation :
http://support.rollsbattery.com/en/support/solutions/articles/5964-battery-sulfation
I'll take a look deeper this afternoon if I can find any other details. Remember to adapt your refractometre to the current temperature (putting distilled water on the test area, and changing the 0 position).
Michel
I'll recommend you to follow this YT webinar :
