batteryshed77
New member
- Joined
- Nov 12, 2020
- Messages
- 15
I'm having another issue which I'm hoping is a simple setting somewhere from being fixed - but is leaving me perplexed.
I have a 600Ah pack, at 43.6V nominal (12s Li-ion @ 3.63V/cell based off the datasheet) that's 26kWh.
I'm regularly charging my pack between what should be ~20% - 90% capacity, but Batrium will indicate charge/depletion much quicker than it should (a least based on the SOC values it broadcasts) By this I mean SOC goes from 100% -> 0%, meanwhile my batteries are still above nominal voltage.
Here are my shunt settings. I've set a capacity of 600Ah, but you can see a 'daily cumulative' charge of 928Ah but a Daily e-meter of only 15.7kWh
This broadly aligns to what I'm seeing, it seems to think I've put in 928Ah (40.4kWh @ 43.6V) whereas in reality I've only put in 15.7kWh (360Ah @ 43.6V)
Why does Batrium think that 15.7kWh is 928Ah? It is clearly measuring the correct amount of energy (15.7kWh), knows the current, knows the voltage - so why 928Ah? I'm pulling my hair out.
(For black and white confirmation, I currently charge my pack at up to 108A for 4 hours per day. This is the only charging window, and charging tails off for the last hour - so I'm confident 360Ah / 15.7kWh is correct & 928Ah is not.)
Does this matter? Well not at the moment, but I'm looking to implement a level of control based on SOC - and at the moment that isn't viable without a reasonably accurate SOC.
I have a 600Ah pack, at 43.6V nominal (12s Li-ion @ 3.63V/cell based off the datasheet) that's 26kWh.
I'm regularly charging my pack between what should be ~20% - 90% capacity, but Batrium will indicate charge/depletion much quicker than it should (a least based on the SOC values it broadcasts) By this I mean SOC goes from 100% -> 0%, meanwhile my batteries are still above nominal voltage.
Here are my shunt settings. I've set a capacity of 600Ah, but you can see a 'daily cumulative' charge of 928Ah but a Daily e-meter of only 15.7kWh
This broadly aligns to what I'm seeing, it seems to think I've put in 928Ah (40.4kWh @ 43.6V) whereas in reality I've only put in 15.7kWh (360Ah @ 43.6V)
Why does Batrium think that 15.7kWh is 928Ah? It is clearly measuring the correct amount of energy (15.7kWh), knows the current, knows the voltage - so why 928Ah? I'm pulling my hair out.
(For black and white confirmation, I currently charge my pack at up to 108A for 4 hours per day. This is the only charging window, and charging tails off for the last hour - so I'm confident 360Ah / 15.7kWh is correct & 928Ah is not.)
Does this matter? Well not at the moment, but I'm looking to implement a level of control based on SOC - and at the moment that isn't viable without a reasonably accurate SOC.