10ah or 15ah from ping

M

malibudude

10 mW
Joined
Aug 23, 2011
Messages
21
Location
Toronto, Ontario, Canada
Hi all,

I'm replacing the battery for my amped front geared motor (350-450 watts). My controller is capable of 25amps and the motor while rated for 36v can do 72v. I've decided to go 48v, but, thought I would get the 10ah battery.

My commute is about 9 miles and I usually charge my battery at work.

Any benefit with going with the 15ah other than longer range? Do I need to be concerned with discharging the cells faster since it's 48v vs. 36?. I already placed the order for 10ah but I'm sure I could quickly change it 15ah.

Thanks
 
max discharge on the 10AH battery is 20amps ( 2C ), so for long battery life and best performance, you'll need the 15AH for that controller.

The upside is that you shouldn't have to charge your battery at work
 
I have been using a Ping 48V 10AH on my trike for the last two years. The controller tops out at about 23 amps. Seldom pull over 20 amps. Normally pull under 15 amps max.

Having said the above, it depends a lot on what you require. If your terrain and expected speed require the full 25 amps most of the time the 15AH battery would handle it better, plus give you more range, as Neptronix said.
 
10 AH is fine, but 15ah is definately better if you got the room for it.
 
nothing from ping, too expensive
better genuine a123 20ah-Automotive
 
48v 10 ah will do if your ride has few hills. Get something that can put out 30 amps if you have to climb, or if the route has a horrible amount of stops and starts.

So that would be a 36v 15 or a 48v 15.

I tend to recomend the 48v 15 for a few good reasons. Even if you won't climb hills, your battery increases it's expected lifespan if you lower the c rate. The rule of thumb is cut c rates in half, For me, I have hills so with a 20 amp controller I tend to pull 15 amps quite a bit. So I discharge my pings at 1c, or half the rated c rate most of the time. In your case, if you ride full throttle much, a 10 ah ping would be getting discharged at 1.5c. Still within the 2c limit, but closer to the limit, and your depth of discharge would be deeper.

The best reason to get the 48v 15 ah, or the 36v 20 ah is range. You may find yourself taking the bike much further if you have the range, especially on weekend rides for fun.

48v 15 ah and 36v 20 ah are just about the biggest size that can be carried conveniently on bikes. But even though you have a front motor, if you carry the battery on a rear rack, handling will improve the lighter the battery gets. So a 36v 15 ah is not a bad compromise, still the same range and weight as a 48v 10, but enough ah to keep the c rate comfy for the ping.

If you went to a cellman A123 pack, the c rate is much better, so you could carry a very small and light battery of that type. But you wouldn't have the extra range of a big ping, which can be worth it's weight in gold on a beautiful weekend day.
 
I do have hills I need to climb so now I'm thinking to get the 36v15ah since the 48v15 is $533 which is more than I wanted to spend. The 36v15 is$416 I think. I'm planning on putting the battery on the rear rack so weight is an issue as well.

Thanks for advice again. Really really appreciate it. I'm still new to this.
 
I think the 36v15ah is right in the sweet spot for me. I get the extra battery life and extended range and 30amp output, just not the 48v speed, however, the 36v battery charges up to 45-46 volts initially.
 
the 48X15 will last longer than 36x15. you are talking about $100 more for an extra 12 of the 5Ah pouches and bigger BMS. better to cut out the excess booze than scrimp yourself into a lame battery. also with 48V you will be subjected less to the busses interfering with your rear mounted battery. jmho.
 
Okay. Thanks for help here.

clearly this isn't such a clear cut choice. My system is designed for a 36v. Higher volts means more heat and potential failure. As long as I'm easy with the throttle I should be okay. Seems like I should splurge and get the 48v15ah even though it's heavy at 16.5lbs. $533 is quite a lot of money + extra shipping ($642 total), however, sounds like a good investment putting aside the a123.
 
the amped controller will work on 48V too i think.

the current A123 pouches are really a different animal from the ping pouches. they are 20Ah and can have big high current bursts that the ping cannot provide. but using the $25/pouch they cost, 16 for a 48V battery would be $400 and the BMS will be another $100 so you are in the same ball park, except the ping is already assembled, with charger included, but buy an extra one at the same time, the bigger one along with the 3A charger he includes.

to try to save money on the order, tell him i sent you, hehe, and ask if you can use a personal money transfer to avoid the PP fees or send the money by wire transfer to reduce the fees.
 
I think I'm just going to stick my original plan of 48/10. Reason being the ride is mostly level except for 1 hill to work and 2 hills coming home. (coming home is a very gradual uphill).

Using my watts up meter I should be able to monitor performance and adjust as needed. The additional up charge of almost $200 seems unnecessary.
 
I'll throw one more thing at you - after a year of use, no battery puts out more capacity. It's always less so even ignoring C rate degradation, a smaller battery will always need to be replaced sooner than a larger battery.

If your range estimates are accurate and you don't expect to use more than 1/2 battery capacity then it won't put you into much of a bind. But if you're cutting capacity close running a new small battery try to envision that battery capacity in a year or two?
 
I'm going to try and get the 15ah battery. When I was cycling on my ebike I was using it daily for commuting. I have a car so it's not my only mode of transporting.

I think it's a safe investment and worth the extra $$
 
Good choice. You will pat yourself on the back over the long term. Especially when it gets cold out and suddenly your C rate drops and it performs worse for the season- you'll have a bigger overhead in discharge rating, meaning you won't take as big of a hit in performance.

As it ages, that extra overhead you may mean get a year more out of it. Or that in it's final days, it is not a total slug.

Also, it's nice to have more range than you need. Nice luxury to have. It just makes the bike so much more useable.

( in other words, go for it ! )
 
cruiserbikeman said:
I can attest to Ping's 48v 15ah battery range. This past wednesday I traveled 15 miles using WOT.
Click to expand...

Do you know what voltage you reached? I assumed you didn't hit LVC.
 
Range will vary with speed. Assuming your speed on 48v will be about 25 mph, you should get close to 20 miles out of a 48v 15 ah ping. Traveling much slower, my personal best was 39 miles.

If weight is an issue, you can still get by with the 10 ah, but if you like the idea of range go for the 15. To me, range is everything with an ebike. 10 miles is barely warmed up.
 
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