llile
1 kW
- Joined
- Dec 18, 2010
- Messages
- 457
Is there a commercial meter than can be used as a capacity gauge for Li-Ion cells? Is there one that can work at higher numbers of series cells, such as for a 72V pack? or am I getting out the Arduinoes again? And what the hell is the proper plural for Arduino? Is it Arduineau?
Obviously the cell voltages for a pack are hard to measure, as the voltage slope is pretty flat, and the voltage would drop under load, complicating the "gas gauge" measurement. I can usually calculate remaining capacity kind of in my head looking at the voltmeter on my cycle analyst, (not to mention read the KWH measurement) however I'm working on a non-bicycle application, where a cycle analyst is total overkill. I just need to know if my batt is fully charged, or state-of-discharge in rough increments. I'd be OK with having to idle the load to get a real number. A % display would be nice, however not absolutely necessary. It would also be nice if it went into sleep mode or used very little juice when things are idle. I've been googling and come up only with meters that can handle 4-7S cells.
Obviously the cell voltages for a pack are hard to measure, as the voltage slope is pretty flat, and the voltage would drop under load, complicating the "gas gauge" measurement. I can usually calculate remaining capacity kind of in my head looking at the voltmeter on my cycle analyst, (not to mention read the KWH measurement) however I'm working on a non-bicycle application, where a cycle analyst is total overkill. I just need to know if my batt is fully charged, or state-of-discharge in rough increments. I'd be OK with having to idle the load to get a real number. A % display would be nice, however not absolutely necessary. It would also be nice if it went into sleep mode or used very little juice when things are idle. I've been googling and come up only with meters that can handle 4-7S cells.