Search found 308 matches

by Bullfrog
Aug 03 2020 8:46am
Forum: E-Bike Technical
Topic: Mxus 3k vs Qs205
Replies: 33
Views: 2783

Re: Mxus 3k vs Qs205

Grin tech has a youtube video where Justin talks about using two wheel drive...IMO I would not mix motor type, you'll end up with one doing all the work.
by Bullfrog
Jul 31 2020 6:33pm
Forum: Vendor Relations Corner
Topic: EM3ev vs Luna Batteries and Kits
Replies: 44
Views: 3992

Re: EM3ev vs Luna Batteries and Kits

If you have a way to charge the pack at a current that is less than the balancing shunt current (typically 50mA or so), you could let it go for a long time and it should eventually bring up the low cell groups. If you can access the cell connections at the BMS, it would be faster to manually charge...
by Bullfrog
Jul 30 2020 5:58pm
Forum: Vendor Relations Corner
Topic: EM3ev vs Luna Batteries and Kits
Replies: 44
Views: 3992

Re: EM3ev vs Luna Batteries and Kits

I can get the cell group voltages...that is how I know there is a low cell group. The capacity of a 5p battery with HG2 cells should be 15 Ah per the battery cell manufacturers data. EM3ev rates it at 14.8 Ah and the best I have gotten is 11.8 Ah...and that was after installing the new BMS that cons...
by Bullfrog
Jul 30 2020 10:52am
Forum: Vendor Relations Corner
Topic: EM3ev vs Luna Batteries and Kits
Replies: 44
Views: 3992

Re: EM3ev vs Luna Batteries and Kits

EM3ev no longer sells the MAC. You can do a one time order directly from MAC...just tell them you would like to buy one motor as a "sample". You can also buy a controller from MAC...I like the Infineon 12 FET IRFB3077 to run with a MAC and a 52v battery. After your first purchase, there is a minimum...
by Bullfrog
Jul 29 2020 4:49pm
Forum: Vendor Relations Corner
Topic: EM3ev vs Luna Batteries and Kits
Replies: 44
Views: 3992

Re: EM3ev vs Luna Batteries and Kits

Latest on my 14s5p HG2 cell battery from EM3ev..... Never could work out the details to reprogram my BMS. EM3ev ended up sending me a new BMS that is supposed to constantly balance the cell groups when charged above about 90%. I installed the new BMS and have charged to battery to 100% over 20 times...
by Bullfrog
Jul 13 2020 1:06pm
Forum: General Discussion
Topic: What powerful rear geared hub motor?
Replies: 12
Views: 2054

Re: What powerful rear geared hub motor?

Thanks for all the advice! In the meantime I stuck the BBS02B motor into the cheap old 26" Specialized full suspension bike I bought second hand for this project (with a cheap pack of four overstock 29.4V 6Ah kids scooter batteries, 2S2P for a 58.8V 12Ah setup). I have to say I've fallen for the mi...
by Bullfrog
Jul 12 2020 9:03am
Forum: E-Bike Technical
Topic: Max rated and phase current for 9,12,18 fet controllers
Replies: 36
Views: 3366

Re: Max rated and phase current for 9,12,18 fet controllers

Phase current is three interlaced Sine waves a 120 degrees apart. Battery current is just the sum of the three phase currents at any point in time. Both the battery and phase currents can be the limiting factor depending on your battery, controller, and how your controller settings. Regarding your q...
by Bullfrog
Jul 11 2020 10:01pm
Forum: E-Bike Technical
Topic: Max rated and phase current for 9,12,18 fet controllers
Replies: 36
Views: 3366

Re: Max rated and phase current for 9,12,18 fet controllers

"doing foolish stuff from time to time"....I resemble that remark :lol: . Just so I mislead anyone reading my post about the MAC temperatures...If anybody wants to run a MAC motor, I recommend running your parameters through the Grin Tech Motor Simulator and although you can run a MAC at 145C, I wou...
by Bullfrog
Jul 10 2020 3:38pm
Forum: E-Bike Technical
Topic: Max rated and phase current for 9,12,18 fet controllers
Replies: 36
Views: 3366

Re: Max rated and phase current for 9,12,18 fet controllers

You can safely run the MAC up to about 145C...I have run mine for a couple hours between 145-150C when I had it in a 29" rim with a 29x2.6" Maxxis Ikon tire. I always tried to keep mine below 110C until Justin at Grin Tech told me he had run a MAC on his dyno at 145C and did not have any degradation...
by Bullfrog
Jul 09 2020 7:55pm
Forum: Motor Technology
Topic: new double wide mac
Replies: 7
Views: 1072

Re: new double wide mac

Did the "Double Wide" MAC ever go into production?

Has anybody ever seen one?

Sounds like a great idea to me.
by Bullfrog
Jul 09 2020 3:29pm
Forum: E-Bike Technical
Topic: Max rated and phase current for 9,12,18 fet controllers
Replies: 36
Views: 3366

Re: Max rated and phase current for 9,12,18 fet controllers

If you are going to a 52v battery it is going to be difficult to get one with more than 50A capability unless you build it or use LiPos. The BMSs that EM3ev and Luna use are limited to 50A or less. Using the Grin Tech Motor Simulator...I ran the MXUS 4503 against a 10T MAC both with 52v, 50A Battery...
by Bullfrog
Jul 08 2020 8:57pm
Forum: E-Bike Technical
Topic: Max rated and phase current for 9,12,18 fet controllers
Replies: 36
Views: 3366

Re: Max rated and phase current for 9,12,18 fet controllers

Just a tid bit of data...no clue how or if it would pertain to your specific controller....the Infineon 18 FET with 4110 FETS comes shipped set to 60A Battery and 160A Phase current. IMO it is capable of more but how much more, I have no data to go on. I run an Infineon 12 FET 3077 FETs set to 50A B...
by Bullfrog
Jul 07 2020 1:22pm
Forum: E-Bike Technical
Topic: Max rated and phase current for 9,12,18 fet controllers
Replies: 36
Views: 3366

Re: Max rated and phase current for 9,12,18 fet controllers

The short answer on increasing the amperage with a lower voltage is probably NOT. The long answer is "It Depends". The amperage squared times the resistance determines the amount of heat produced...assuming you have enough Voltage to push that much amperage through the circuit. So for overheating co...
by Bullfrog
Jul 06 2020 8:15pm
Forum: General Discussion
Topic: What powerful rear geared hub motor?
Replies: 12
Views: 2054

Re: What powerful rear geared hub motor?

unkel...how are you enjoying your 12T MAC? I went down the same path as you several years ago and started with a 12T MAC and eventually I came to the conclusion that a BBSHD is the way to go IF you are going to ride off road. Several reasons....it can be geared to operate efficiently at low speeds, ...
by Bullfrog
Jul 06 2020 4:58pm
Forum: E-Bike Technical
Topic: Max rated and phase current for 9,12,18 fet controllers
Replies: 36
Views: 3366

Re: Max rated and phase current for 9,12,18 fet controllers

Yes I know...old thread. But there is a lot of good info :D . IMO...unless you define a bunch of the variables like battery voltage, battery capacity, wire conductivity, type of FETs, wheel diameter, type of motor, weight of the bike and rider, etc., etc. It is very difficult to compare data. I had ...
by Bullfrog
Jul 04 2020 4:14pm
Forum: E-Bike General Discussion
Topic: MAC/BMC maximum continuous watts?
Replies: 18
Views: 2157

Re: MAC/BMC maximum continuous watts?

Been running my 12T mac at 140-145C = 293F. Ambient temp was 95 "F". My mistake on the temp units above. I lubed the MAC gears with Mobil SHC 100 many miles ago. Never had a problem with the gears or the clutch. My temps may be a little higher than others because I ride standing up at all times due ...
by Bullfrog
Jul 04 2020 3:35pm
Forum: E-Bike General Discussion
Topic: MAC motor selection and MAC clutch issues.
Replies: 13
Views: 1452

Re: MAC motor selection and MAC clutch issues.

I need the rear freewheel motor because I have four rims already lace to MAC freewheel hubs and I am constantly changing things around and doing all kinds of experiments The cassette version will operate the same way as long as you have the same sprocket sizes to match the gearing, and adjust the d...
by Bullfrog
Jul 04 2020 2:07pm
Forum: E-Bike General Discussion
Topic: MAC/BMC maximum continuous watts?
Replies: 18
Views: 2157

Re: MAC/BMC maximum continuous watts?

Rode a few days ago with my 12T MAC (52v)...I weigh 210 lbs and my bike weighs 70 lbs. Some moderate hills in the NW corner of FL. Perfect day for testing but not for comfort...ambient temp was 95F. With a 29x2.6" (752mm OD) Maxxis Ikon on the wheel with the 12T MAC, I was running 140-145 degrees F ...
by Bullfrog
Jul 04 2020 1:38pm
Forum: E-Bike Technical
Topic: 12T MAC motor and high current
Replies: 43
Views: 6536

Re: 12T MAC motor and high current

Need help finding a 10T MAC Rear Freewheel 135mm motor...EM3ev is no longer selling the MAC. Tried to contact MAC directly but I have not gotten a response. Anybody have a suggestion on where to buy a 10T Rear Freewheel MAC besides Alibaba? I need the freewheel as opposed to the cassette version bec...
by Bullfrog
Jul 04 2020 8:40am
Forum: E-Bike General Discussion
Topic: MAC motor selection and MAC clutch issues.
Replies: 13
Views: 1452

Re: MAC motor selection and MAC clutch issues.

Does anybody know where I can buy a 10T MAC Freewheel 135mm OLD Rear motor besides Alibaba? EM3ev is no longer going to sell them and I can not get a response when I contact MAC directly. I need the rear freewheel motor because I have four rims already lace to MAC freewheel hubs and I am constantly ...
by Bullfrog
Jul 01 2020 1:44pm
Forum: E-Bike Technical
Topic: Has anyone played with "BLOCK TIME" on Infineon Controllers?
Replies: 227
Views: 26578

Re: Has anyone played with "BLOCK TIME" on Infineon Controllers?

Yep old thread, I know but I need a little better understanding on how my Infineon controller limits speed...please. An example...my top speed on level ground is 25 mph with my current set up. If I put 80% in the "Speed 1 %" entry...does the controller limit my speed by limiting the voltage to the m...
by Bullfrog
Jun 30 2020 4:49pm
Forum: E-Bike Technical
Topic: EM3ev MAC motor for fat bikes !!
Replies: 31
Views: 4517

Re: EM3ev MAC motor for fat bikes !!

Ran across this the other day so I thought I'd save it. Don't know a thing about the company... https://eunorau-ebike.com/collections/btn-kits/products/48v1000w-mac-geared-rear-8t-cassette-hub-motor-electric-bike-kit-26-27-5-28-wheel-electric-bike-conversion-kit-45km-h Nice....Thank You. I am looki...
by Bullfrog
Jun 30 2020 1:46pm
Forum: E-Bike Technical
Topic: EM3ev MAC motor for fat bikes !!
Replies: 31
Views: 4517

Re: EM3ev MAC motor for fat bikes !!

Excellent question...if anyone finds a good deal on a MAC motor, please post where you got it. I would like to buy another one. Grin Tech offers the GMAC but it is a little bit more pricey because it is regen capable with a couple more improvements...but I don't need the extras. Luna offers the MAC ...
by Bullfrog
Jun 29 2020 12:21pm
Forum: E-Bike Technical
Topic: EM3ev MAC motor for fat bikes !!
Replies: 31
Views: 4517

Re: EM3ev MAC motor for fat bikes !!

AFAIK, the Hitch has a steel frame, so you could squeeze the dropouts 10 mm on each side (years ago before wider hubs were available I used a 135 mm rear). The brakes are relatively easy to position with spacers, but we had to machine a part for the freewheel. IMO, this will work with the cassette ...
by Bullfrog
Jun 28 2020 5:13pm
Forum: E-Bike Technical
Topic: EM3ev MAC motor for fat bikes !!
Replies: 31
Views: 4517

Re: EM3ev MAC motor for fat bikes !!

Has anybody actually installed the Fat MAC on a bike with 190 mm dropouts? The Mongoose Hitch I have has 190mm dropouts and I am a little concerned about being able to get the brake rotor and rear sprocket spaced properly as well as having enough axle to bolt the motor on securely. The axle nuts tha...