Amps Rising not tapering During Abs Charging?
Charging with the pm4b last evening, I brought the bank to 9.2a @ 14.64Vabs. Amps plateaued there early on during the 2 1/2 hour charge. It was getting late, so I shut things down for the night. To...
Forum Discussion
Much of what you seek can be revealed in a quick study of the mechanism of Thermal Runaway. You may assume that as materials gain in temperature, electrical resistance increases. All this hypothesis goes out the window when chemistry enters the formula. A warmer battery has lower impedence. During charging it would be quite normal to see GC220 vary from say 38 to 43 amperes in the span of three seconds.
I repeatedly stress the term Trends & Tendencies. Get to know the behavior pattern of your proven good batteries. React when the pattern deviates for unknown reasons. A combination of metering and hydrometer will aid in analysis. If curiosity overwhelms you, take cell temp IR shots straight down onto the grids. An anamoly is significant and will show up in a specific gravity verification.
As an example 15.0 volts applied to a fully charged battery will render a specific charge amperage value. The value will first lessen then increase as electrolyte temperature increases. I've found the temperature value of 40c to be a significant threshold. Above that temperature is where interesting electro chemical events start taking place. 50c is to be treated cautiously.
I repeatedly stress the term Trends & Tendencies. Get to know the behavior pattern of your proven good batteries. React when the pattern deviates for unknown reasons. A combination of metering and hydrometer will aid in analysis. If curiosity overwhelms you, take cell temp IR shots straight down onto the grids. An anamoly is significant and will show up in a specific gravity verification.
As an example 15.0 volts applied to a fully charged battery will render a specific charge amperage value. The value will first lessen then increase as electrolyte temperature increases. I've found the temperature value of 40c to be a significant threshold. Above that temperature is where interesting electro chemical events start taking place. 50c is to be treated cautiously.
