Difference between 20120 and 12020??
 

What is the difference between these two ESC's:

"BK Electronics 12020 Warrior Controller"
http://www.rc-monster.com/proddetail...K12020W&cat=21

"20120 Brushless Car Controller":
http://www.rc-monster.com/proddetail...icrocar&cat=21

The specs look exactly the same except where it says "75 gram (without Part)". Same current, cells, dimensions, etc. Is there anything to justify the price difference of $399.99 vs $280.00??

Also, the title for the cheaper one says "BK Electronics 12020 Warrior Controller", but the description says "20120". Is one a misprint?

the 20120 is called a micro controler and it has some other tuning options over the warrior, not sure because i don't have one but probably in mid throttle programming for cooler running

the way to tell the difference between the regular and the micros is that the regular (9920,7020, ect.) has the amp rating in the beginning instead of the end like the micros (3695,36140,20120,ect.)

So, by "micro" do you mean physically smaller? Judging by the proportions of the capacitors and wire between the two, they both look the same size to me, the picture is just bigger on one. Besides, they both have "MicroCar" in the description. A closer look seems to show that the 20120 is slightly longer, but the dimensions in the description say they are the same. :P:

I think the micro refers to the microprocessor in the controler, but not sure though

In the programming aspect of it there is difference. The micros has a start protection and stuff you can turn on or off in the programming. I supposed to run cooler in part throttle as well.

Sorry to dig up this old thread but tax return season is upon us and I am just about ready to buy a BL motor and ESC. Plus, I still have a 5% coupon to use. :)

At first, I was looking at the 9920, but since the 12020 and 20120 both are capable of 120A, I figure they would run cooler if I didn't use them close to their full potential. The ESC I get will be going into an E-Revo and it a bit on the heavy side (a little heavier than a Nitro version I'd say), so there will be more load on the motor drawing more amperage. I know the ESC I pick depends somewhat on the motor/winding I use. Aside from that, would the advantages of the 12020 have any effect on my heavy truck? I don't want to spend an extra $120 for features I won't use, especially since I was planning to use a 9920 initially, which doesn't have the added features either.

For the BL motor, I was looking at a 1940, but it's just too pricey. Price-wise it's between one of the Lehner basic XLs or the Wanderer XLs. I currently have a 2 speed e-maxx tranny on the Revo, plan to use 12-14 cells max, and would like a top speed of about 35-40mph max in second gear with strong acceleration (first gear can be whatever speed). I'd like about 10-12 minutes run-time on 12-14 cells of GP3300's if possible. This is mostly for bashing. That said, I was thinking of the Lehner basic XL2800 or the BK 6XL or 7XL.

Which BL motor would be the better choice for what I'm looking for? Then, which controller would be suitable for that motor? If the 9920 will work, fine, but I want something very reliable and do not want to run the controller close to its max rating nor do I want to stress the motor.

Thanks in advance!

I would reccommend a wanderer XL over a BASIC XL. For 12-14 cells a 7XL would be a good choice, although if it were me I would look at possibly an 8XL (will give low temps and long runtimes - easily over 10-12 minutes, maybe 20). Controller wise the 9920 could handle either of these motor on that cell count with ease.

the wanderers are better and i would recommend getting an 8xl as for the controller you dont really need a 12020 or 20120 a 9920 would be fine

Thanks guys.

Just curious, how much current does the 7xl draw at 12 and/or 14 cells? The Feigao 7xl draws as much as 95 amps (according to the chart at their site). If the Wanderer 7xl is similar, I really don't want to run a 9920 that close to it's rating - even if that high current is for short durations. If that is the case, then I will get the 12020 just for peace of mind (and maybe for future upgrades) since it's only $75 more.

So, providing the current isn't too high in the BK, I think I know what I'm going to get in two weeks!

Thanks again for the advice!

95 amps would be close to the limit of the 9920 so it would be better to get the 12020 in my opinion if for nothing else other than peice of mind and confidence

the 9920 can handle peaks WAY higher than its rating. coolhand has run a 7xl on a 7020. the 6xl would be ok on the 9920 so a 7xl will be plenty...

OK, 7xl and 9920 it is then!

I wish these BL motors would have more specs other than just the kv rating. At least power consumption would be nice. At least that way you can figure out the current draw for a particular number of cells to achieve 45-50k rpm.

Anyway, good luck getting 95amps out of sub C cells for any period of time without them blowing up! A 7XL on 12 cells won't pull any where near 95 amps constant, maybe on 20+ cells it might

Yeah, but I'm looking in the future. Eventually, I want to get Lipos or whatever is the best for power to weight ratio at that time. Even though lots of people run Lipos with no problems, I am still a bit leary due to the chance of destruction from undercharging/overcharging/puncturing. I'm going to wait until they are more stable and for the price to come down. Until then, I'll make do with sub-C's knowing that I won't unlock the full potential of any BL setup until I do break down and upgrade.

For an xl motor and room to breathe, the 120 amp warrior is the one IMO. The 9920 can handle quite a bit, but the xl motors can also draw a lot of power. the 8xl or higher can get away with the 9920 more easily for sure, but a 7xl with some voltage is indeed pushing the 9920(it is proven to work, but the 12020 is better IMO).

Thanks Mike. That's kinda what I was figuring, but without the amperage rating, or wattage rating to calculate amperage based on the number of cells used, on a specific motor, it's hard to guess what will work safely. At least the Lehner 19xx series does tell you max power it will handle, but those cost too much. I imagine a similarly sized non-Lehner can would dissipate approximately the same wattage, but the thickness of the can and how well the heat transfers from the coils to the can makes a difference. I suppose I could just get the largest amperage available to be safe, but that darn cost factor gets in the way. :)

BTW Mike, would increasing the size of the heatsink on any controller void its warranty? Of couse, if something went wrong as a direct result of the heatsink upgrade, I wouldn't expect to warranty it.

technically, removing the shrink wrap voids the warranty. BK is pretty fair when it comes to standing by their stuff, though. If the problem was a manufacturing problem, they would likely take care of it.

generally bk will warrant anything. i had one i got wet and they replaced it for free!!

Yeah, I would never submit a warranty claim for something that was obviously my fault. A warranty is for defective products, not stupid users. :)

I have a little heatsink "box" that I was planning to use, properly insulated where applicable of course. That way, I can waterproof the ESC without affecting the heat dissipating properties. I'm not planning on going underwater, I just want to protect it against the occasional splash from a shallow puddle or something. Plus, all that extra surface area will keep it cooler, and that's always a good thing.

You have Kv, I and R ...
You have all the parameters to calculate power...

And some manufactures even provide efficiency over RPM or load data...

Artur

Where are the current and resistance (or impedance) ratings? All I see are the number of turns and the kv rating. Sepcifically, the BK Wanderers?

For feigao motors are on the motor can. I hope you can get the same info from BK as well. If not then it is not difficult to get the trend from feigao/nemesis to BK...

Artur

Feigaos yes, no such luck for BK. The only detailed documents they offer is for series 10, 15, 19, 22, Basic, and Basic XL. The bk-electronics site simply lists the turns and kv ratings. On the "dimensions" page, it does list the max rpm range (80,000 rpm!) and max current (which is 120A for the XLs). Of course that max current will depend on the number of turns.

The best one can hope for is that someone else with deep pockets and a desire to try various motors can vouch for a specific model - but then there are the variables like truck weight and number of cells to consider. You'd think with the popularity BL motors are gaining that manufacturers would list all the specs so consumers could make an educated buying decision.

However, with the help of several people, I think the BK Wanderer 7XL or 8XL are the best bets.

By the way, the answer to this thread is found in the Warrior's manual (http://www.bk-electronics.com/man_warrior_eng.pdf)