What is this BS Castle is feeding this customer?

[Pdelcast]

Originally Posted by What's_nitro?

Couldn't that be prevented by installing a diode on the battery leads (unless the MMM uses regen' braking)??? Seems like something that should be done if there is the slightest chance of it happening.

The MMM uses regen braking -- has to, there is too much energy to try to dissipate as heat in the ESC, so the braking energy goes back to the battery.

Besides, the diode would just make the capacitors work HARDER, not less -- the issue comes when the power side impedance is so high that the capacitors have to work really hard to keep the ripple voltage low. When the capacitors have to work hard, they get hot -- if they get too hot they fail.

SO -- no resistors, no diodes, nothing at all in series between the battery and the ESC. The lower the battery to ESC resistance, the better for the ESC, and the cooler the ESC will run.

Thanx!

[bdebde]

Originally Posted by Pdelcast

The MMM uses regen braking -- has to, there is too much energy to try to dissipate as heat in the ESC, so the braking energy goes back to the battery.

Besides, the diode would just make the capacitors work HARDER, not less -- the issue comes when the power side impedance is so high that the capacitors have to work really hard to keep the ripple voltage low. When the capacitors have to work hard, they get hot -- if they get too hot they fail.

SO -- no resistors, no diodes, nothing at all in series between the battery and the ESC. The lower the battery to ESC resistance, the better for the ESC, and the cooler the ESC will run.

Thanx!

So Patrick,

Can we use a resistor on the battery to prevent the big spark with 6s setups? Plug in neg, plug in resistor to charge caps, then plug in main positive.

[bdebde]

Originally Posted by bdebde

So Patrick,

Can we use a resistor on the battery to prevent the big spark with 6s setups? Plug in neg, plug in resistor to charge caps, then plug in main positive.

Patrick, any answer for this?

[Pdelcast]

Originally Posted by bdebde

Patrick, any answer for this?

No problem,

Use about 50-500 ohms or so (value isn't that important), 1 watt minimum, surge rated resistor.


You will lose that "MANLY" pop when you plug in the battery though... it's very cool on the SHV with 20S and 4000+ microfarads of capacitance... sounds like a gun going off... (We added an inrush current limiter circuit on the SHV, 'cause connectors would die in about 3-4 plugins...)

[lutach]

Originally Posted by Pdelcast

No problem,

Use about 50-500 ohms or so (value isn't that important), 1 watt minimum, surge rated resistor.


You will lose that "MANLY" pop when you plug in the battery though... it's very cool on the SHV with 20S and 4000+ microfarads of capacitance... sounds like a gun going off... (We added an inrush current limiter circuit on the SHV, 'cause connectors would die in about 3-4 plugins...)

I like the pop . It scares the crap out of my friends and it gives that "I'm tough effect".

[sleebus.jones]

Originally Posted by lutach

I like the pop . It scares the crap out of my friends and it gives that "I'm tough effect".

Heck yes! Makes all the folks around me say WTF was that?! Pop = awesome. :)

[bdebde]

Originally Posted by Pdelcast

No problem,

Use about 50-500 ohms or so (value isn't that important), 1 watt minimum, surge rated resistor.


You will lose that "MANLY" pop when you plug in the battery though... it's very cool on the SHV with 20S and 4000+ microfarads of capacitance... sounds like a gun going off... (We added an inrush current limiter circuit on the SHV, 'cause connectors would die in about 3-4 plugins...)

Cool, thanks Patrick, I have my 6s batts set up for the resistor already, Just have to wire the Monster up when it gets here.