Appropriate ESC / current ratings for a 2845-size motor

[tudordewolf]

Hello everyone,

I'm trying to make sense of the "max amps" rating on some brushless motors, and how they relate to the constant / peak current ratings of an ESC.

Most 1/16th scale ESC's recommend 24mm size motors and max out around 25-30 amps, and 1/10th scale ESC's recommend 36mm motors and offer 50-60 amps. That all makes sense to me, a 4800kv 2435 specifies a 24A max draw, and a 3300kv 3650 estimates a ~60 amp max draw, perfect for their corresponding ESC's.

So what should I use for a 2845-size motor that has a 47A max draw? The hobbywing 16BL30 has a 30A rating but a 180A peak, so would it be fine, or prone to overheating?
F540 motors are internally 2845's, and I see them paired with the bigger ESC's.

The only hint I've got is that the 28mm motors use 3.5mm bullet connectors, so they'd naturally fit a smaller ESC rather than the larger ones. I havn't found any ESC's that specify a 28xx-size motor, they all skip from 20/24mm to 36mm and up.

Thanks for any info from people that have used Hobbywing's 16BL30 in particular- what motor did you use, in what setup, and how were the temps?

 

[Greywolf74]

I've not used the specific ESC you're asking about but what I generally do is look at the wattage for the motor and then figure out the max A draw for the particular voltage I'm going to be running and then I try to pair it with and ESC that has a higher continuous A rating than the motor can pull max or at least close. For example if I determine that the motor max amp draw is 88A then if I happen to have an 80A ESC laying around thats not in use then I may use that provided I'm not running short gearing or anything thats going to push the motor hard. Generally though I like to overkill the ESC whenever possible though just for the sake of longevity. Hope that helps in some way

 

[Sixtysixdeuce]

What you're putting it in and how youll be driving should be a major factor in your decision. If its going in a 1/12 or 1/10 crawler, it's not likely to see near the max or continuous load it would in a basher like a mini Revo or Mini 8eight T.

I have three 16BL30s. One was in a 1/14 knockoff of the mini 8ight for awhile with a 4,500 KV 2435, but it got moved into a WPL B14 with a Hobbywing 2030 5,200kv. Another is in my WPL B16 with a 2435 3,300 KV, and the 3rd is in my MN78 Cherokee crawler with a 5,300 KV 2430. With their gearing, none of these exceeds 10 MPH top speed on 2S.

If I were putting a 2845 in a 1/16 or 1/14 4wd basher, I'd probably use a 10BL60 ESC.

 

[jaketuff]

I planted a Hobbywing 10BL60 and a 2845 Surpass 5900kv motor into a HBX 16889 Pro. I have programmed it to build power slowly, it will back flip from a start if I pin the throttle!

I run it on 120c 3s.

GPS I can hit 50mph with it easily. I am toying with it to try and get the chassis to 75mph. New ESC and Motor coming.