FLIPSKY new 20s 100A tiny controller (vesc based)

Electric Motors and Controllers
BalorNG   100 W

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Re: FLIPSKY new 20s 100A tiny controller (vesc based)

Post by BalorNG » Nov 25 2021 9:10am

mxlemming wrote:
Nov 25 2021 8:43am
Phase amps is the correct way to rate a controller.

With 100 battery amps you can generate pretty much any amount of phase amps. Currently on my test bench I'm generating 270 phase amps from 17A battery at 24V.

Battery amps has no useful meaning.
Not exactly true if you are running very high phase resistance motors like typical ebike motors :)
But I agree that you should look at phase amps first and how long the controller can sustain THEM.

mxlemming   10 kW

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Re: FLIPSKY new 20s 100A tiny controller (vesc based)

Post by mxlemming » Nov 25 2021 11:18am

BalorNG wrote:
Nov 25 2021 9:10am
mxlemming wrote:
Nov 25 2021 8:43am
Phase amps is the correct way to rate a controller.

With 100 battery amps you can generate pretty much any amount of phase amps. Currently on my test bench I'm generating 270 phase amps from 17A battery at 24V.

Battery amps has no useful meaning.
Not exactly true if you are running very high phase resistance motors like typical ebike motors :)
But I agree that you should look at phase amps first and how long the controller can sustain THEM.
Ummm .. yes it really is true.

At very low speed you can equate power in to I^2R losses.

100A battery at 72V is 7.2kW

For a typical crappy hub motor, phase resistance is less than 100mohm; phase to phase 200mohm. That gives a current of about 190A.

But that's a hub motor that would melt with a small fraction of that power. Scale to a qs205 with 0.065 ohm phase to phase and you're at 330A... Scale that to the motor on my desk with 10mohm phase to phase and you got 850A and a fireball.
Hold my beer while I divide by zero :flame:

john61ct   100 GW

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Re: FLIPSKY new 20s 100A tiny controller (vesc based)

Post by john61ct » Nov 25 2021 11:29am

OP states the unit can handle 7000W?

My point is not that Flipsky "should not" give us at least a ballpark phase amps spec.

But so far they haven't,and that is the reality we need to deal with.

I am sure over time some range will be revealed by the tech-savvy early adopters

along with all the other IRL data points we'd like to see

and then those holding off purchasing due to insufficient information will feel more comfortable

BalorNG   100 W

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Joined: Nov 10 2019 7:22pm

Re: FLIPSKY new 20s 100A tiny controller (vesc based)

Post by BalorNG » Nov 25 2021 12:00pm

john61ct wrote:
Nov 25 2021 11:29am
OP states the unit can handle 7000W?

My point is not that Flipsky "should not" give us at least a ballpark phase amps spec.

But so far they haven't,and that is the reality we need to deal with.

I am sure over time some range will be revealed by the tech-savvy early adopters

along with all the other IRL data points we'd like to see

and then those holding off purchasing due to insufficient information will feel more comfortable

...
They did, this is 120A and this is basically package limit an firware limit. Maybe you can hack it, but the legs will basically act as fuses :) Not the worst that can happen, btw.

atkforever   10 W

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Re: FLIPSKY new 20s 100A tiny controller (vesc based)

Post by atkforever » Nov 25 2021 12:05pm

But since we know the fets are 120amps package limited, max phase amps should be 120A or did I miss something?

Can we Say that Current flowing in phase A motor wise, is equal to current flowing between the legs of the mosfets ON related to phase A?

john61ct   100 GW

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Re: FLIPSKY new 20s 100A tiny controller (vesc based)

Post by john61ct » Nov 25 2021 1:47pm


BalorNG wrote:They did, this is 120A and this is basically package limit an firware limit.
Ah so I missed that.

100A battery maximum

120A phase maximum

Is that correct? At this point definitive as the vendor rating?


BalorNG   100 W

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Posts: 231
Joined: Nov 10 2019 7:22pm

Re: FLIPSKY new 20s 100A tiny controller (vesc based)

Post by BalorNG » Nov 25 2021 2:39pm

john61ct wrote:
Nov 25 2021 1:47pm
BalorNG wrote:They did, this is 120A and this is basically package limit an firware limit.
Ah so I missed that.

100A battery maximum

120A phase maximum

Is that correct? At this point definitive as the vendor rating?
YES, this IS vendor rating:
https://flipsky.net/collections/electro ... controller

MorbidlyObeseKoala   10 W

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Joined: Apr 06 2018 3:53pm

Re: FLIPSKY new 20s 100A tiny controller (vesc based)

Post by MorbidlyObeseKoala » Nov 29 2021 9:58am

Is there an agreement that an antispark switch needs to be used with one of these controllers as well?
Is that switch pre-charging the controller as well as limiting sparks at the connection?

I have a dc solar circuit breaker I was using as a main switch that was keeping sparks away from my connection at the battery. They seem a little expensive for simply spark reduction considering they have no other protections (no circuit breaking for high amps, no built in temperature protection, no reverse polarity protection)

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