How would a 36-volt SLA pack compare to a 36-volt lifePo pack, 15 ah each?
05-14-11, 12:50 PM
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How would a 36-volt SLA pack compare to a 36-volt lifePo pack, 15 ah each?
Title says it all.
Right now I'm running a 36-volt SLA system and it's just not quick enough off the line (torque) and the top speed is slow. Plus, after over a hundred charges the battery is starting to shoe weakness.
The current setup is a 9c front hub direct drive, 36-volt, 14ah battery pack.
How would a 36-volt, 10ah or 36-volt, 15ah LifePo compare in terms of torque and top speed?
I don't care about range as my commute is only four miles.
Right now I'm running a 36-volt SLA system and it's just not quick enough off the line (torque) and the top speed is slow. Plus, after over a hundred charges the battery is starting to shoe weakness.
The current setup is a 9c front hub direct drive, 36-volt, 14ah battery pack.
How would a 36-volt, 10ah or 36-volt, 15ah LifePo compare in terms of torque and top speed?
I don't care about range as my commute is only four miles.
05-14-11, 05:24 PM
#2
Senior Member
To put it in easy terms, just a little bit more torque and a couple mph faster and a lot more range.
2mph more top end and depending on AH.. 10 ah will get you a couple more miles then your 14ah SLAs. Torque will be the same in either 10 or 15ah lifepo4.
2mph more top end and depending on AH.. 10 ah will get you a couple more miles then your 14ah SLAs. Torque will be the same in either 10 or 15ah lifepo4.
05-15-11, 02:08 AM
#4
What's the voltage sag of the SLA's? Are you able to see the actual voltage when you turn the throttle or do you not have a voltage analyzer...damn, I can't believe I've forgotten the word for those things already. Oh yeah, a Cycle analyst. Whichever one sags the least. Like if the SLA sagged to 33v and the Lithium sagged to 35v then obviously the lithium is going to give you more speed. With the 15AH capacity, you'd get probably 7 AH out of the SLA (ony 50 % ) and you would get around 13 - 14 AH out of your 15 AH lifepo4 pack because of the flat discharge curve of lithium, you can get more out of it.
Now that lifepo4 prices have come down a bit, there really is no contest anymore. Back in like 2006, yeah, you could make an argument for SLA but now that you can get a 12v 20AH lifepo4 for $120 and an 12v20AH SLA is about $50, it's really not even close as to which is the better buy. The SLA will probably last one year, maybe two. The Lifepo4 will give you at least 3 to 4 years or maybe more. My lifepo4 is still going strong now in my 2nd year. My SLA's died after about 6 months of heavy usage.
Now that lifepo4 prices have come down a bit, there really is no contest anymore. Back in like 2006, yeah, you could make an argument for SLA but now that you can get a 12v 20AH lifepo4 for $120 and an 12v20AH SLA is about $50, it's really not even close as to which is the better buy. The SLA will probably last one year, maybe two. The Lifepo4 will give you at least 3 to 4 years or maybe more. My lifepo4 is still going strong now in my 2nd year. My SLA's died after about 6 months of heavy usage.
