A very odd thing has happened.
Since the last 2 months the CAC has climbed from 76 to 88.78. Range has also increased from standard 122 to 154 now as well as maximum range 100% is 220 km.
Outside temperature is a normal 6 degrees Celsius winter in Holland. All temperature readings of the pack, motor and PEM through OVMS are normal. Pack is 20 degrees Celsius.
The obvious reason of course will be that the pack was out of balance. But this is not true. My pack has always been in balance. 2 months ago voltage difference individual cells was max 0.03V. Now difference is 0.04V. In the VDS menu I always find 99 times zero at menu option balancing.
So if pack is balanced, what could be the reason than?
Maybe algoritme is confused meaning that reporting 154 km is in reality less and CAC is also wrong calculated. So I checked energy content: today I charged on AC 121 km range using 25 kWh. Efficiency of AC loading at 24A is approximately 70%, so energy into battery is 17.5 kWh, meaning full capacity is around 32 kWh (max range 100% is 220 km).
I also did a DC charging with the JdeMo unit and charged 33% with 12.5 kWh. So 100% is 37kWh with a heat loss of 10% is 33 kWh.
Pack energy content is therefore around 32 kWh which points to a CAC of more then 90 (32/53 * 160).
It looks nice that range increases but I can not find a solid technical explanation, meaning I do not feel comfortable which can result in a big bang in the near future as end of life of the pack
I have seen sometimes in the past jumps up from CAC of max 2 points but never 12 points. Does anyone have had the same experience and can explain what is happening?
Since the last 2 months the CAC has climbed from 76 to 88.78. Range has also increased from standard 122 to 154 now as well as maximum range 100% is 220 km.
Outside temperature is a normal 6 degrees Celsius winter in Holland. All temperature readings of the pack, motor and PEM through OVMS are normal. Pack is 20 degrees Celsius.
The obvious reason of course will be that the pack was out of balance. But this is not true. My pack has always been in balance. 2 months ago voltage difference individual cells was max 0.03V. Now difference is 0.04V. In the VDS menu I always find 99 times zero at menu option balancing.
So if pack is balanced, what could be the reason than?
Maybe algoritme is confused meaning that reporting 154 km is in reality less and CAC is also wrong calculated. So I checked energy content: today I charged on AC 121 km range using 25 kWh. Efficiency of AC loading at 24A is approximately 70%, so energy into battery is 17.5 kWh, meaning full capacity is around 32 kWh (max range 100% is 220 km).
I also did a DC charging with the JdeMo unit and charged 33% with 12.5 kWh. So 100% is 37kWh with a heat loss of 10% is 33 kWh.
Pack energy content is therefore around 32 kWh which points to a CAC of more then 90 (32/53 * 160).
It looks nice that range increases but I can not find a solid technical explanation, meaning I do not feel comfortable which can result in a big bang in the near future as end of life of the pack
I have seen sometimes in the past jumps up from CAC of max 2 points but never 12 points. Does anyone have had the same experience and can explain what is happening?