Well, lessee... 1500W maybe a nominal rating for the motor, but how much will the controller deliver? In other words, might be more? Dunno, but try this...

The Headway cells above (not sure about the Pings) are rated as able to discharge at 5C standard, 10C in bursts and 15C in brief pulses.

This means that a 48V 10Ah pack at 5C can deliver 5x480W or 2400W continuous without even breathing hard...

Pretty sure the Headway BMS has no problem with this... the BMS is about monitoring LVC (low voltage cutoff) and to prevent overcharging and keeping the pack individual cells balanced. It's the controller that limits Amps usually I believe.

How fast you want to suck power from a pack depends on size of pack in Whs and how much runtime you need.

What sort of range extension are you looking at? At what speeds? Stop and go? Hills? What sort of distances have you been getting from the 2400Whs of lead that you have been using? Wiring connections all tight? Tires pumped hard etc?

tks
Lock

EDIT:
ps... OK, just checked that evcomponents.com site and about the 48V 10Ah Headway packs they say:
"Built in BMS with max continuous discharge of 60a Max cutoff discharge current 100A "


!!!!



BTW, larger Ah pre-made packs eg 20Ah would be better but I don't know how they would fit in your available battery space. I tap about 10Ah packs `cause that's what I am interested in, but regardless 10Ah or 20Ah ya parallel wire the packs together using Schottky diodes to literally string togther the total Ahs you need...
I would cut out and assemble cardboard "batteries" of the available pack dimensions to see what might fit how and where.

Here's another fun bit of info ya may not know about... The SLA batt mfgrs lie... OK, mislead a bit. The deep cycle batts that folks have been using in their EVs were never designed for the fast discharges that EVers want...

Those Ah ratings? Like a 12V batt that's rated as 10Ah or 20Ah? Those ratings are based on a TWENTY HOUR rate... In other words, how much energy the batt will give up if it is drained slowly over a 20 hour period. Commonly expressed as C/20.

And lead batts don't perform as well when you run them down faster. Honest manufacturers will post this info on their web sites... The truth is, if ya run a "20Ah" batt down fast, like all in only one hour, ya might only see an effective 14Ah out of the batt!

Here is a generic discharge rate graph for SLA batts:


With Lithium, this stuff all gets thrown out the window. Their Ah ratings are not affected by high discharge rates!

So a 20Ah SLA pack and a 20Ah Lithium pack really are apples and oranges. Ya see quite a bit more range out of the "same size" Lithium battery...

Cheers
Loc

Under normal driving conditions (meaning some hills, lots of stop and go, and running at speeds up to 65 K per hour with an average speed of around 55 k per h) I have found that I can comfortably travel 45 to 50 km. But I do notice a drop in performance once I reach the 25 to 30 k distance. I would like to at least double my travel distance to around 100k or even better. Also my current charger will fully recharge these batt's within 3 hours.

Thanks Loc for your input with this, it is greatly appreciated.

Thanks Loc for your input with this, it is greatly appreciated.

Happy to help. I am no expert by any means. I only hope to be a "user"... hop on and drive w/out worrying what is "under the hood"...

But I have sat at the feet of EV Gods for most of ten years and only hope to pass along what I have understood so far from all of this. A lot has been happening fast in the EV world in the last couple of years, so unfortunately it pays to be paying attention to this fast-moving (battery) tech...

So yer EVT 168 has been running on 2400Whs and delivering near 50kms... well, not really. `Cause you have been driving SLAs the controller probably has been cutting off power at 80% DOD based on the rough measure of voltage... so 2400Wh x .8=1920Whs...

Then, `cause you've been riding lead, there's the Peukert Factor unique to lead that has depressed Ahs realized further... Say conservatively to 90% of published rating... .9x1920Wh=1728Wh...

Over 45km... so 1728Wh/45Km=38.4Wh/km

Ya want 100Km on one charge?

38.4Whx100km=3,840Wh

at 48V, 3,840Wh/48V = 80Ah of pack...

(80Ah x Lithium$$$ purchase cost=Ouch)

:)

...still, less than 2x the 50Ah capacity you are familiar with...

And a heck of a weight savings for the vehicle too, which translates as better acceleration and braking, and also contributes a bit to range...

And the Lithium chemistry not as affected by seasonal cold temperatures...

Basically yer vehicle will be transformed...

Erroring always on the side of conservative (having wasted my life as an accountant), Lithium mfgrs point out that, like lead, capacity is loss after x number of cycles... like, maybe only 80% of new after 2000 recharges... depending on charge and discharge rates...

So, for me? I would still shoot for doubling that 50Ah sized pack... I want to climb on my electric wheels and ride for five worry-free years w/out having to deal with a dying pack...

EVen if a 48V 100Ah Lithium pack costs $4000 (probably less), amortized over 5yrs to $800 yearly, if it saves a monthly Metropass all summer long, or EVen more, the annual costs of an auto... Ya would still be ahead of the game...and be feeling good about not blowing exhaust into yer neighbours faces or dripping hydrocarbons etc onto our pavements (which then are washed down into our supply of drinking water.)

All this of course ignores the thrill of driving silent and odor-free electric power, and the joy of commuting as entertainment. YMMV but I'll bet not.

Clearly LiFePO4 has the power density and the weight density you...crave(? hehe.) So it's all about the volumetric energy density. Where to fit the cells w/out resorting to adding saddlebags. Although adding bags as additional batt storage IS an option.

100kms on one charge? You ask for a lot. But it is very do-able today if you understand "life-cycle" costing and "intangible benefits".

Regards
Lock

Thanks once again Loc for all the info.

It looks like I am lusting for a 48V 100Ah Lithium pack . I will need to plan some other mod's to the bike to move the battery pack to the lower part of the bike to also improve the center of gravity.

Eric

I will need to plan some other mod's to the bike to move the battery pack to the lower part of the bike to also improve the center of gravity.

Nothing in the legislation that prevents towing a trailer full of batts.

Might give the best of both worlds. Ya can couple up the trailer for long distances/groceries etc and leave it home for shorter trips...

L