Yet another Yellow Ninja 250 Conversion!

[drewjet]

Bike Looks great. I showed to a few guys and work and they all liked it. Nice Work!

what is your top speed now? and range?

Drew

[Jay64]

Yeah, having the tach as a meter would be awesome. That would help to make some really clean builds. I have never done it before, but I know you can change out the background plate for your tach, so you would even be able to re-calibrate the markings to show true what the needle is pointing at. I think that is a REALLY great idea guys.

[frodus]

Well it would be nice to use the tach, but I imagine the market is pretty small. It would be a nice add on for Kelly. Watt hours would be good as it would use the complete range.

The market seems pretty decent for a little guy like me

i mean, all those cars and motorcycles out there with a Tach, some use it as their tachometer, but some don't use it at all.

I mean, as stated, its just a voltage to frequency converter, but its got to be able to be calibrated, and adjustable. I'll start looking into it.

[frodus]

Yeah, having the tach as a meter would be awesome. That would help to make some really clean builds. I have never done it before, but I know you can change out the background plate for your tach, so you would even be able to re-calibrate the markings to show true what the needle is pointing at. I think that is a REALLY great idea guys.

I just made mine so that each 1000RPM is 50A

so the 1 on the gauge is 50A, 2 is 100A. You could just do watts as well, so the full range is actually Average watt usage, you could even have a button that toggles between volts, current, watts, etc (little LED's tell you what "mode" you're in).

[pgt400]

Bike Looks great. I showed to a few guys and work and they all liked it. Nice Work!

what is your top speed now? and range?

Drew

Thanks! Its geared for 50 mph. 14/72 with a 50rpm/volt Mars. I was looking at the brushless (r/c experiance), but it seems the controllers are not very eff at the higher current rates ....yet. I get 20 miles before the LVC kicks in under acelleration. Doesn't matter if I do 2, 10 or 20 miles, as soon as I park it I charge. Looking forward to spring upgrades...PSI's and possibly an Agni motor for 84 volts.

[pgt400]

For the tach meter, I would want to monitor Voltage mostly. Kinda like a fuel gauge and overall battery condition. After 500 miles now, I can tell the state of my batts charge by watching the voltage sag under accelertion. Maybe remove the display and replace with an expanded 50 - 90 volt display?

[frodus]

Yeah, I guess you could take it out.... but Tach's go up over 10krpm, so you could have 0-10 be state of discharge... 0-100%

I like the stock look I guess, and you don't have to fabricate a way to mount something. Plus, you've already got the meter, the electronics to drive a signal is cheap, its designed to be easily seen, and they're backlit already. Hell, it could be SOC, Volts, Amps, Watts, throttle percent, motor temperature, just about any analog/digital signal.

Whats your absolute longest range on the bike so far?

[pgt400]

My longest range to date is 23 miles before hitting the Kellys LVC under accel. Once it hits, I can still maintain 40 + MPH but must keep the amps below 100 on accel. This is with in town driving. My ride to and from work is 14 miles round trip, this is 90% 45-50 mph mostly flat, the LVC will kick in at about 18 miles. I am now charging at work so as to preserve the batts. If my mission was to get 25 miles I bet I could, but it would require conservative accel and reduced high speed runs. I started out with a 12 tooth drive, then 13 and now 14. I picked up about 3.5 mph per tooth and give up range. Funny, once you get the higher speed you don't want to go back! Going to PSI's will give me more range and performance (as the packs voltage will sag less).The Agni at 84 volts would give me the speed, range increase and allow a 6:1 ratio.

I just ordered 2 Analog Devices AD537 V/F sample's. Looks to be an excellent chip for the tach interface.

[pgt400]

Swapped the Mar 709 for an Agnimotor model 95. Mostly because it can take 84 volts and 6k rpm. Looking forward to seeing what it can do!

agni motor install.JPG

(64.95 KiB) Downloaded 736 times

[jasonh]

Thanks for posting this. I'd like to start working on a conversion this spring (have to get my wife a vehicle of her own first she said), and I have a similar commute - 14mi round trip. I was thinking of going with bigger SLA's, but seeing that you have plenty of range, I think I will be fine with some smaller ones for the time being, as I'd like to get the bike together for fairly cheap so my wife doesn't kill me. So far it looks like it'll cost me around $2300 not including the cost of the bike..

Hope you don't mind, I'll be using your build as a good reference for mine, whenever I start that is

I think the most difficult part is going to be finding a bike for cheap.

Mind if I ask how much that Agni motor cost? Is there still room on the Ninja for another battery that can still be hidden behind the fairing?

[pgt400]

If you go with sla's, get the B&B 35AH. You could fit 44AH cells if you stacked then 3 high by 2 wide by 2 deep up front, but you would have to widen the lower fairing. The Agni was $1,250, price varies based on the exchange rate. The Mars is a good motor too and less then half the price. Buy a clean late model bike, the motors sell well on Ebay. I think my bike was $1,000 and I sold the motor for $700. It barey had 1000 miles on it. The new 08 / 09 Ninja 250's look hot.

[jasonh]

Is there any particular reason you would recommend the B&B's over the Powerstars you currently have?

[pgt400]

Well, I've never tried the B&B's as the Powerstars are my first pack and they have worked out well. However, many, many others have stated they get more out of them. I get about 22 AH's outa mine in the summer and I've always wondered if I could have done better with a premium battery. Now that I've built my bike and see how much I enjoy it....If I was to buy AGM's again, it would be ethier B&B's or Greensavers. The B&B's would cost about 50% more. I'm also going to upgrade my chargers from 3 amp to 5 amp so I can get 2 full charge rides a day.

[drewjet]

Any update on Agni vs Mars?

[pgt400]

Yes, first off, the Agni's a keeper. Comparison based on following. Keep in mind the Mars was geared 5.5:1 (50 rpm per volt) and the Agni is geared 7.2:1 (71 rpm/volt). I geared both for a top speed of 50 Mph based on their respective rpm/volt. A better comparison would be made with the Mars (or Etek) 08 motor which is 70 rpm per volt also...but I (or Mars) wouldn't reccomend running it at above 50 volt as the rpm would be too high... the Agni armature is reinforced. I have my Kelly controller set for a max of 200 amps which it would easily peg with either motor on acceleration.

1). Under inital aceleration the Agni is considerabily stronger....the Mars has a softer feel (better eff over 100 amps?).
2). Feels very smooth. Better balanced ?? Even though it is spining ~ 2000 rpm higher then the Mars.
3). Acceleration from 30-50, much better (motor or gear ratio? or both?).
4). The Agni runs cooler.
5). Weight, the Mars 09 weighs 36lbs, Agni 24.
6). The Agni can handle 84 volts and 6K rpm....wide rpm range is nice when you have a single speed transmission.

I would guess that the Mars motor would compare favorabily to the Agni when current is kept below 150 amps and voltage under 50 (for the Mars 70 rpm/volt). Once you surpass these numbers the Agni quickly widens the performance gap.

[pgt400]

I'ld like to build (3) 7S26P packs of KONIONS, if I could get 550 cells for a decent price. I really like the fact that they are forgiving on thier charge / discharge.

[thomas]

The only thing you need for konions is to set the minimum voltage in the controller? No need for individual lvc?

[drewjet]

Thanks for the great comparison.

Do you have some amp draw numbers at speed to see the difference in efficiency.

Are you planning on trying a higher gear ratio to get a higher top speed, or is 50 enough for you?

[pgt400]

It uses about 52 amps at 50 mph just like the Mars did. Which is what I'd expect, at higher currents is where the Agni would start to out due the Mars. I have it geared for 50mph to allow decent range with the 35 AH AGM batteries I'm currently using. I have an 11 & 12 tooth drive gears that I'll try when the weather breaks. The 12 should get me close to 60 MPH, at the expense of another 30 amps. I could also goto 84v which would get me to 58 with my present gearing. What I'd really like is 96 of the new 14AH PSI cells!

[thomas]

Have you got any prices on the 14ah cells?

[pgt400]

Have you got any prices on the 14ah cells?

I don't, but Andyh has hinted they may be 20% more cost for 40% more capacity.... he should know when they will be available but I don't think they are shipping yet. Jozzer has said he is getting them for the IOM race...sounds like he may be sponsored by Lifebatt???

[thomas]

20% not that bad was expecting alot more.

[bquick]

I switched my yellow Ninja 250 over to B&B batteries and I'm not getting nearly the range that you are. I'm running six 35 ah deep cycle batteries, a kelly controller, and a Perm 132 motor. I set the LVC to 70 volts. It's geared to hit 48 mph when the batteries are fresh (11/60 teeth). After only six or so miles, the controller drops out and blinks a 1-3 sequence, which indicates low voltage. If I coast for 5 seconds or so, it will kick back in, but as soon as I get near 40 mph, it will kick out again. For some reason, the Kelly never seems to go into low power mode, it just cuts out abruptly.

Anybody have any ideas?

- Brad

[pgt400]

Brad, that doesn't sound right at all. With my Mars motor geared for 48 I averaged about 16-20 miles depending on how I pushed it. When I was geared for 42 (12/72) I could get over 20 no problem. The Mars 09 is a 50 rpm/volt motor and I was 14/72 I think. With the Angi 95 (70rpm/volt) and geared for 52 I average 15-18 miles. My 35AH Powerstars have 1000 miles on them now. B&B's are claimed to be the best SLA's. I bought PS's because they were only $52 each and I expected them to only last 1 season, but they are still going strong....probably come from the same factory in China?? I use 3 on board 24v 5ah smart chargers and they are always on float.

DATA...

Do you have a current / AH meter? The CA HO is good. At 50 on flat I pull about 65 amps (V is about 72). I average about 18-20 AH out of my pack in ABOVE 65 temps before the KELLY kicks in. When my Kelly kicks in (under ~50 volts) it immediately shuts down, if I back off I can resume but I have to accellerate slower. I can still use full throttle and drive home several miles, just my top speed is reduced by about 7-8 mph and I have to keep accell current under 100 amps or the LVC will kick in.

[bquick]

What do you have your LVC set at on the Kelly? In a previous post, you had it set to 70V. If that's the case, how do you get under 50V?