It's nice to ride a 19kg bike with a 720W battery
SZZS specific CEF50-main thread (initial builds and troubleshooting related only)
- Thread starter TCFlowClyde
- Start date
thaeber
Well-known member
The housing for 43V is the small Bafang Battery. And more Volt doesn’t mean more Wh. It’s simply the amount of cells and their specifications that results in Wh. Voltage of the pack x Ah of the parallel batteries = Wh. 10S4P 21700 3,6 V 5Ah each will 10x3,6V = 36V. 4x5Ah 20Ah. 36V x 20Ah = 720Wh.
Oh I thought they had the highest capacity on 43v my bad
Overall, which option is best? given that the engine is to be unlocked above 25km/h.
I would like the battery to weigh less than 3 kg / 6.61 lb
mike_kelly
E*POWAH Elite
Actfually they probably do have the most capacity. Watts is watts. But as Thaeber pointed out watts=voltage*current. So more voltage gives more watts for the same current. But since each cell is the same voltage 3.7v you need more cells to make a 43v battery than a 36v battery.
Some would argue that high torque is aided by higher current capability and high speed is aided by higher voltage. You don't get both and light weight and small space.
In this thread are the weights of the different batteries.
if the cables run through the top tube, how would you run your dropper post cable? Don't these need to connect from the bottom via the downtube?
mike_kelly
E*POWAH Elite
My conclusion too. It was my mistake because the plastic guides on my bike went up the seat tube which was confusing. But only because I thought they continued up into the top tube but they don't. They are just stuffed up the seat tube to make it easier to re-install the motor for the person who tested it at the factory.
TCFlowClyde
Active member
- Thread starter
- #1,928
Check back in 6 months. Nobody really knows. I've done small jumps and drops with my CEF50 (8 rides in), but I'm no dirt jumper. Seems robust so far...
I have a full-powered LCES04 160/150. Light Carbon does a good job with their frames. I wanted the bigger battery or else I probably would've originally waited for the LCE930.
But I'm glad I didn't!
So far my bigger travel 180/165 Enduro CEF50 rides well.
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Herculesridesebikes
Member
Yeah I guess it's too early to tell yet. I'd love to see Rob do a review of the LCE930 I think I'm leaning toward it due to the seat stay crossbar. The 410 battery should be enough for my application I think.Check back in 6 months. Nobody really knows. I've done small jumps and drops with my CEF50 (8 rides in), but I'm no dirt jumper. Seems robust so far...
I have a full-powered LCES04 160/150. Light Carbon does a good job with their frames. I wanted the bigger battery or else I probably would've originally waited for the LCE930.
But I'm glad I didn't!
I believe one is in the works, Jim from lightcarbon has been in contact with Rob about sending a frame his way.
mike_kelly
E*POWAH Elite
If you folks could indulge me for a short story. I love wolves. I go to Yellowstone every summer to watch wolves. Here is a little video my wife made of wolf puppies learning to swim,
So my theme for my CEF50 was wolves. Based on Norse-Viking mythology Odin supplied chariots for the sun and the moon to speed them across the heavens. But he grew tired of the slow progress across the sky. So he sent the sons of Fenrir, the wolf god, to encourage the sun and the moon by chasing them through the sky threatening that they would be consumed if the wolves caught them. If the wolves did catch them the world would turn cold and moral chaos would engulf the world. It would be the Ragnarok, the end of the world, with men and gods fighting until they all fell into the sea.
So this is my end of the world bike, which seems appropriate for these days.
The headtube is Fenrir the giant wolf god and the sides have Hati and Skoll the wolf brothers chasing the sun and the moon. The text on the downtube is in Nordic Rune alphabet and translated into english it says "Sendit".
So my theme for my CEF50 was wolves. Based on Norse-Viking mythology Odin supplied chariots for the sun and the moon to speed them across the heavens. But he grew tired of the slow progress across the sky. So he sent the sons of Fenrir, the wolf god, to encourage the sun and the moon by chasing them through the sky threatening that they would be consumed if the wolves caught them. If the wolves did catch them the world would turn cold and moral chaos would engulf the world. It would be the Ragnarok, the end of the world, with men and gods fighting until they all fell into the sea.
So this is my end of the world bike, which seems appropriate for these days.
The headtube is Fenrir the giant wolf god and the sides have Hati and Skoll the wolf brothers chasing the sun and the moon. The text on the downtube is in Nordic Rune alphabet and translated into english it says "Sendit".
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TCFlowClyde
Active member
- Thread starter
- #1,932
Just thought I would add some more input to the rationale of a bigger 720Wh battery for those coming from the full-powered realm. While mostly flat, I rode very loose and sandy singletrack for about 35-40% of my ride today. I alternated between the 4th (S+) and 5th (Boost) power modes.
I run 3" tires, so of course that helps float in sections that bog down flow. It was still fun though due to the speed and power though slow sections. The M820 is as powerful as I hoped. My full-powered M600 would have been superior, but not by that much!
Here's the results:
Range: 20 mi
Battery remaining: 40%
Ride time: 110 min
Average speed: 11.0 mph
I run 3" tires, so of course that helps float in sections that bog down flow. It was still fun though due to the speed and power though slow sections. The M820 is as powerful as I hoped. My full-powered M600 would have been superior, but not by that much!
Here's the results:
Range: 20 mi
Battery remaining: 40%
Ride time: 110 min
Average speed: 11.0 mph
Myalteregohamish
Active member
Nicely done Mike
Myalteregohamish
Active member
Do you recall how much elevation gain that was?Just thought I would add some more input to the rationale of a bigger 720Wh battery for those coming from the full-powered realm. While mostly flat, I rode very loose and sandy singletrack for about 35-40% of my ride today. I alternated between the 4th (S+) and 5th (Boost) power modes.
I run 3" tires, so of course that helps float in sections that bog down flow. It was still fun though due to the speed and power though slow sections. The M820 is as powerful as I hoped. My full-powered M600 would have been superior, but not by that much!
Here's the results:
Range: 20 mi
Battery remaining: 40%
Ride time: 110 min
Average speed: 11.0 mph
View attachment 118761
TCFlowClyde
Active member
- Thread starter
- #1,935
Fairly flat but choppy dirt and sand...as we dry out in the desert, the horse people loosen up packed trail bed quite a bit plus a lot of sandy washes....hence the plus tire benefits.
TCFlowClyde
Active member
- Thread starter
- #1,936
Great build Mike! Lots of poetic symbolism and relevant mythos to your bike's badging. Truly a unique rig!
Just don't get eaten by a pack of those Yellowstone wolves we hear about on NatGeo Channel! The M820 is a powerful little motor, but it's still not fast enough to out run 'em for long.
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Myalteregohamish
Active member
Could you imagine, you’re watching the 6 o’clock news that night, “ Yep, that’s right I am Mike Kelly from EMTB forums. I was riding my bike and I out of nowhere this pack of wolves start chasing me., I tried petting and speaking sweetly to them, but they weren’t having it., my wife’s the same way first thing in the morning, so you could say I have some experience here. If it wasn’t for my Bafang M820 I would’ve been done for I tell ya.”Great build Mike! Lots of poetic symbolism and relevant mythos to your bike's badging. Truly a unique rig!
Just don't get eaten by a pack of those Yellowstone wolf packs we hear about on NatGeo Channel! The M820 is a powerful little motor, but it's still not fast enough to out run 'em for long.
Hey Mike, I'm very interested in how you go with this.
Please let us know your thoughts, setup, how it works, issues to avoid. Any info really.
thanks.
TCFlowClyde
Active member
- Thread starter
- #1,939
Well, let's just hope Mike's Native American wolf animal spirit guide can collaborate with his Norse-wolf demigod to keep all safe!
You have a very interesting bike ride. I only met a bear once, but he was kind, probably already had someone to eat.
mike_kelly
E*POWAH Elite
You guys! Wolves had only been documented attacking a human once in the last 100years. The rest is hollywood. I spend 3 months, every day, watching them. They are curious. They are like humans. They have a "president" elected by the pack. They work together to raise the puppies. The boss is the alpha female. She leads the pack. The alpha male is the "general" warrior who leads the pack in battle against other packs intruding on the packs territory.
@LAnton I also like Grizzly Bears. Although I took this image in Alaska. He was just 40 ft away.
@LAnton I also like Grizzly Bears. Although I took this image in Alaska. He was just 40 ft away.
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mike_kelly
E*POWAH Elite
I have learned the hard way that you need batteries that don't have a separate charge and motor cable. The parallel battery switch works, with it's own charge cable, and I think there is room to put it inside the frame. I want to put a thermal sensor inside to make sure it is not getting too hot tho. I am also not sure exactly the maximun current the motor will pull in peak so I am not sure the 20amp switch I got will work. The larger 30amp etc definitely will not fit inside the frame. The battery that SZZS made me has a common charge and motor cable so it will work but I don't know about the Bafang made Batteries. Unfortunately my bottle battery does not have separate outputs. That means I can charge it by itself but not together with the internal battery.
I found a waterproof connector that fits the frame to bring out the charge cable and to bring in the external battery cable.
But I have to go to Yellowstone now and focus on packing and hit the road. But I will take it all with me.
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TCFlowClyde
Active member
- Thread starter
- #1,943
Too close for me! Plus, I carry bear spray and a cowbell.
Although one ranger told me that the bell actually might attract mountain lion instead if riding at sunset.
The dangers of mt. biking...
TCFlowClyde
Active member
- Thread starter
- #1,944
Nice...I like the threaded cap better than the flimsy press cap that's a little challenging to secure it properly.
Myalteregohamish
Active member
That waterproof cap is genius. Where did you find it? Super clean Mike.
mike_kelly
E*POWAH Elite
It is an SD20 four pin from Aliexpress.com The matching plug is a right angle for the bottle battery. I will use multiple plugs. One that only uses two pins for the bottle battery, one to rewire the Bafang charger connected to the other two pins.
The Bafang battery can only put out a max of 18 amps. So I hope that means my 20amp switch will work.
The Bafang battery can only put out a max of 18 amps. So I hope that means my 20amp switch will work.
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TCFlowClyde
Active member
- Thread starter
- #1,947
And do you need a separate charger to match? Looks like a 3-prong OEM versus your 4-pongaftermarket must mean new charger.
Can you send a link in the near future after you get settled in Yellowstone? I think many peeps may want the upgrade option, especially as weaker plastic hinge wears off over time.
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mike_kelly
E*POWAH Elite
Interesting TC your charger plug is different than mine. MIne is a Bafang branded charger maybe the 720wa batteries have a third party charger?. 
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mike_kelly
E*POWAH Elite
Did you guys get the side cover or only the bottom cover for the M820?
TCFlowClyde
Active member
- Thread starter
- #1,950
Oh wow? Got a pic of your stock SZZS plug?Interesting TC your charger plug is different than mine. Nice to know things are standard Mine is coaxial.
I have that Bafang plug for M600. Bafang chargerInteresting TC your charger plug is different than mine. MIne is a Bafang branded charger maybe the 720wa batteries have a third party charger?.
View attachment 118798
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