Specialized Hard Rock 19" (7 Speed rear freewheel with Shimano Rapid Fire)
MAC 10T rear hub motor in 26" wheel
Cellman's 30A 9 FET controller with Cycle Analyst
Ping 5A charger
Now that my Ping 48v 15Ah custom split pack has reached the 2 year point, I thought I would write a mini review, Just to highlight its strengths and weaknesses.
For those who don't know, this is a Ping 48v 15Ah battery, split into one larger pack and one smaller one.
They arrive as two separate packs, but are easily joined together to make the specified voltage and capacity.
Pretty much plug and play, apart from the battery pos and neg terminations. For convenience, you just solder or crimp your own terminations on these.
The pack fits quite snug into a triangle frame bag and this in turn fits perfectly into a 19" frame.
Slightly larger frames may be work, but could put too much strain on the velcro straps that hold the bag in place.
Remember, this is a battery that weighs 7.5kg, so needs to be nice and secure when mounted.
When I first tested the brand new battery for capacity, it had the full 15Ah's.
My average usage over the last 2 years are as follows:
Total Miles: 3261
Battery torture: Plenty of start up and hill climb current draws of 30 amps, ranging anywhere from a few seconds to a minute, depending on terrain.
Average current draw on WOT, max speed and flat ground: 17 amps
I estimate charging cycles of 120 plus and tend to ride to the last 1Ah on most trips and fully charge on return. The cycles are fairly low, for I rarely ride in wet weather, as torque can make the back end twitchy.
Battery sag at 30A draw is around 2 volts during the summer and 3 volts during the winter.
Acceleration is slightly slower when battery is cold, as I'm sure is the case with most electric bikes.
After 2 years, the capacity loss has been negligible and reliability has been excellent.
Good Points:
If you use these batteries at 2C draw or less, I think they can be relatively abused and still last a long time.
www.mafcleaning.co.uk
MAC 10T rear hub motor in 26" wheel
Cellman's 30A 9 FET controller with Cycle Analyst
Ping 5A charger
Now that my Ping 48v 15Ah custom split pack has reached the 2 year point, I thought I would write a mini review, Just to highlight its strengths and weaknesses.
For those who don't know, this is a Ping 48v 15Ah battery, split into one larger pack and one smaller one.
They arrive as two separate packs, but are easily joined together to make the specified voltage and capacity.
Pretty much plug and play, apart from the battery pos and neg terminations. For convenience, you just solder or crimp your own terminations on these.
The pack fits quite snug into a triangle frame bag and this in turn fits perfectly into a 19" frame.
Slightly larger frames may be work, but could put too much strain on the velcro straps that hold the bag in place.
Remember, this is a battery that weighs 7.5kg, so needs to be nice and secure when mounted.
When I first tested the brand new battery for capacity, it had the full 15Ah's.
My average usage over the last 2 years are as follows:
Total Miles: 3261
Battery torture: Plenty of start up and hill climb current draws of 30 amps, ranging anywhere from a few seconds to a minute, depending on terrain.
Average current draw on WOT, max speed and flat ground: 17 amps
I estimate charging cycles of 120 plus and tend to ride to the last 1Ah on most trips and fully charge on return. The cycles are fairly low, for I rarely ride in wet weather, as torque can make the back end twitchy.
Battery sag at 30A draw is around 2 volts during the summer and 3 volts during the winter.
Acceleration is slightly slower when battery is cold, as I'm sure is the case with most electric bikes.
After 2 years, the capacity loss has been negligible and reliability has been excellent.
Good Points:
- Ping's service is excellent, even though he is based in China
- Can customize packs for your own particular project
- Really well made packs, with good connectors
- Works well at 2C current draw or less
- Supplied BMS has been reliable
- Longevity of battery appears to be very good
- Capacity after 2 years hard use still excellent
- Cells rarely go out of balance
- Can get stung with large import fees
- Larger capacity batteries are heavy
- Does require some planning and skill to fit a custom pack to bike
- Voltage sag during last 1Ah is almost unbearable
If you use these batteries at 2C draw or less, I think they can be relatively abused and still last a long time.
www.mafcleaning.co.uk
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