Trying to get a feel for what performance I should be able to expect from a Ping battery. I don't know the specifics of what the BMS is and is not capable of. I am running a 24v20Ah pack on a 650W Cyclone. Electrical stats are taken from a Cycle Analyst.
Off the charger the pack seems to stabilise at around 29.5V. As soon as I pull any sort of load the voltage dips to around 25v. For the first 9Ah or so the battery is great, I have accidentally pulled up to 800w but much more than that will trip the BMS. No idea what the voltage is when the BMS trips as I loose the CA at the same time.
After about 9Ah I try to keep my draw to less than 450w and even at that level my voltage dips below 23.3 and starts to bring on the amber caution light on the Cyclone's throttle. If I back off the throttle the voltage picks up to above 23.8
Deeper than 14Ah and I need to be very careful about current draw. Much above 350w will cause the BMS to trip. Again, not sure what the pack voltage is at this time due to loosing the CA. The CA has logged min volts at 18 odd, but I wonder if that is just the transient during the power down.
Is this normal behaviour for LiFePO's, am I flogging my pack excessivley ? I am aiming to not draw more than 10Ah, partly because it is annoying having to monitor my watts but mainly to get the maximum number of cycles out of it. My main trigger for this is I got dusted by an infernal combustion bicycle when I was near home and already used 14 ish AH's. Bloody annoying to go for max power and have all the lights go out :? . Need more power... Cyclone says the controller will take 36v, so I am now torn.. do I get a pair of 36v20A's. Or a second 24v20 and run it in series and risk the controller. Fets are IRFP064v with a Vgss of 60v. And on top of this, if I am going to have a major power storage upheaval, do I wait for Ping's Mk2 pack?
To be honest I briefly considered going the infernal combustion route but I just can't bring myself to listen the the damn thing. Other option I am seriously considering is a 405 on 48v. I got the Cyclone specifically for hill climbing, but 60kph with your butt 3" off the ground is so much fun. I have had a taste of real speed and I want more . I don't HAVE to climb the couple of big hills around here, I just do it for the down hill run afterwards :wink:
Off the charger the pack seems to stabilise at around 29.5V. As soon as I pull any sort of load the voltage dips to around 25v. For the first 9Ah or so the battery is great, I have accidentally pulled up to 800w but much more than that will trip the BMS. No idea what the voltage is when the BMS trips as I loose the CA at the same time.
After about 9Ah I try to keep my draw to less than 450w and even at that level my voltage dips below 23.3 and starts to bring on the amber caution light on the Cyclone's throttle. If I back off the throttle the voltage picks up to above 23.8
Deeper than 14Ah and I need to be very careful about current draw. Much above 350w will cause the BMS to trip. Again, not sure what the pack voltage is at this time due to loosing the CA. The CA has logged min volts at 18 odd, but I wonder if that is just the transient during the power down.
Is this normal behaviour for LiFePO's, am I flogging my pack excessivley ? I am aiming to not draw more than 10Ah, partly because it is annoying having to monitor my watts but mainly to get the maximum number of cycles out of it. My main trigger for this is I got dusted by an infernal combustion bicycle when I was near home and already used 14 ish AH's. Bloody annoying to go for max power and have all the lights go out :? . Need more power... Cyclone says the controller will take 36v, so I am now torn.. do I get a pair of 36v20A's. Or a second 24v20 and run it in series and risk the controller. Fets are IRFP064v with a Vgss of 60v. And on top of this, if I am going to have a major power storage upheaval, do I wait for Ping's Mk2 pack?
To be honest I briefly considered going the infernal combustion route but I just can't bring myself to listen the the damn thing. Other option I am seriously considering is a 405 on 48v. I got the Cyclone specifically for hill climbing, but 60kph with your butt 3" off the ground is so much fun. I have had a taste of real speed and I want more . I don't HAVE to climb the couple of big hills around here, I just do it for the down hill run afterwards :wink: