Frakentrike
10 W
Hi guys,
My brand new 48v 20Ah Ping LiFePo v5 battery gave me a nice solid 19Ah of battery life on the first day I did a full commute on it but it has been steadily dropping after only about 4 full cycles (4 days of commuting) to the point where it yesterday only delivered 17Ah barely getting me home from work. All measurements taken with my new CA v3. (I have the 40A Grinfineon controller)
Last night I plugged the battery in to charge and it stopped charging a lot earlier than usual despite my going for a short night ride in addition to the usual commute. I plugged it in again this morning to top it up, but the charger fan didn't start up - normally after a night's resting the charger will always push a little more current into the pack before switching off.
The motor is a 1KW hub motor which has been drawing up to 35A at full load and pulling up to 1.5KW according to the CA thanks to the battery having the high rate Ping BMS which is rated to 40A continuous with peaks up to 60A.
I'm wondering if the 48v-12v DC-DC converter I hooked up to drive my lighting is pulling too many Amps as it is rated for 20A max. It is a 240W DC/DC Step-DOWN Power Converter Voltage Regulator. It is only driving a 20W LED headlight, LED tailight and Aurora LED flagpole though so I wouldn't have thought this should be an issue? This regulator has a No-load input current of ≤10mA and I'd have the lights on usually for much less than half the commute.
I've been very careful to follow a gentle breaking in period for the battery only going for short rides to start with and allowing the BMS to fully balance all cells overnight on several occasions (and not leaving the battery on charge after that) before I went for my first full commute.
I'll have to try it out with the DC-DC converter disconnected to find out the real Ah I get from the battery as the CA doesn't measure the amps used by the DC-DC converter.
Anyone think I should be worried about my battery pack? (says he nervously!) :|
My brand new 48v 20Ah Ping LiFePo v5 battery gave me a nice solid 19Ah of battery life on the first day I did a full commute on it but it has been steadily dropping after only about 4 full cycles (4 days of commuting) to the point where it yesterday only delivered 17Ah barely getting me home from work. All measurements taken with my new CA v3. (I have the 40A Grinfineon controller)
Last night I plugged the battery in to charge and it stopped charging a lot earlier than usual despite my going for a short night ride in addition to the usual commute. I plugged it in again this morning to top it up, but the charger fan didn't start up - normally after a night's resting the charger will always push a little more current into the pack before switching off.
The motor is a 1KW hub motor which has been drawing up to 35A at full load and pulling up to 1.5KW according to the CA thanks to the battery having the high rate Ping BMS which is rated to 40A continuous with peaks up to 60A.
I'm wondering if the 48v-12v DC-DC converter I hooked up to drive my lighting is pulling too many Amps as it is rated for 20A max. It is a 240W DC/DC Step-DOWN Power Converter Voltage Regulator. It is only driving a 20W LED headlight, LED tailight and Aurora LED flagpole though so I wouldn't have thought this should be an issue? This regulator has a No-load input current of ≤10mA and I'd have the lights on usually for much less than half the commute.
I've been very careful to follow a gentle breaking in period for the battery only going for short rides to start with and allowing the BMS to fully balance all cells overnight on several occasions (and not leaving the battery on charge after that) before I went for my first full commute.
I'll have to try it out with the DC-DC converter disconnected to find out the real Ah I get from the battery as the CA doesn't measure the amps used by the DC-DC converter.
Anyone think I should be worried about my battery pack? (says he nervously!) :|