Good day,
I need some help to understand if my AGM Batteries are dead...
Reason why I am asking is we are not sure if our inverter is dying, or if Batteries are flat or both...
We had a bit of strange "electronic" smell the other day, minor but noticable, unfortunately we werent able to locate the source.
Batteries are 2 Eliminator Ultra 6V 192Ah in series, three years old, usage between 3 and 5 month/year.
Sitting charged and disconnected during winter, no usage, where we get down to - 45°C.
Batteries are charged by a Smart Solar MPPT 100/50
Parameters set according battery manufacturer:
Absorption 14.12V
Float 13.45V
Equalization 14.55 (Disabled as not recommended)
Monitoring by Smart BMV 712
If required we recharge by a Generator powered 120V/12V 50A Charger with AGM settings.
Now the stoty:
Couple days ago the batteries were fully charged 100% SoC, float status
over 12 hrs we consumed 61 Ah, SoC showed 69%, Voltage was down to 11.83V @ basic load of 3.3A by Starlink.
Then the fridge drawing 10-13Amps tried to start, voltage dropped to 11.52 and Inverter (120V/1.5kW) , which is supposed to work from 10.6V-14.5.V, switched off.
Not only switched off, but started the audible alarm at 5 a.m., the other day it was at 2 a.m.
The only thing to avoid this is running the genset before going to bed and top up the batteries...
In the past sometimes we went down as far as 55% w/o issues and inverter did start. Unfortunately I don't have detailed records from those days.
The battery statistics by BMV 712
deepest discharge -89Ah
avg discharge -70Ah
cummulative Ah drawn 11.721Ah
discharged energy 143.3kWh
charged energy 159.8 kWh
total charge cycles 31
synchronizations 141
min batt Voltage 10.66
max batt voltage 14.73
Any feedback highly aprecciated
I am already close to buy a Multiplus II and two new batteries, these wake up calls are anoying
