running a booster pack

[wasp]

i have 4 9.6v 600mah rc bats that i want
to set up as a boost pack to raise my volts
from 42-52 or so...is this doable for testing
can i wire for boost or volts on demand or
do i have to wire it up together then ride?

 

[Link]

You can use a relay to swap it in and out of the circuit. That's how I plan on doing it, anyway. Just have one position be a circuit through the batteries, relay, and controller, then the other be through the batteries, relay, boost pack, and controller.

Some sort of LVC on the boost pack that doesn't allow the relay to be activated when the pack is deal would be a good idea, too.

 

[marvingalaxy]

Could this same relay system be modified so that ultracaps could be used as the booster? Since they would be taken out of the battery loop when not boosting, could they then be charged by a plug brake? Since there is little limit on charge speed on capacitors, it seems like an ultracap booster pack is the more sensible place to store regen braking energy.

 

[Link]

Hmm...

You'd have to use a different relay (a DPDT, methinks), but otherwise, yeah, that'd work.

Some diodes would be needed to keep the caps from running the motor after it's going slow enough for the caps to overcome the BEMF from it, of course, but that's a simple matter. And same with the batteries, you'd need an LVC to protect the caps.

But I'm starting to like this idea. In addition to a voltage boost, you could also work out a relay array that allowed you to use the cap's voltage to get going from a start, saving a bit on the batteries.

Mebbe there will be a budget allotment for a small supercap bank in my future...

 

[swbluto]

Hmm...

You'd have to use a different relay (a DPDT, methinks), but otherwise, yeah, that'd work.

Some diodes would be needed to keep the caps from running the motor after it's going slow enough for the caps to overcome the BEMF from it, of course, but that's a simple matter. And same with the batteries, you'd need an LVC to protect the caps.

But I'm starting to like this idea. In addition to a voltage boost, you could also work out a relay array that allowed you to use the cap's voltage to get going from a start, saving a bit on the batteries.

Mebbe there will be a budget allotment for a small supercap bank in my future...

:lol:

But, yet, that doesn't seem entirely impossible. This is clearly worthy of an energy/voltage/cost analysis(I'm thinking the amount of capacitance you'd need for any noticeable boost would be a little costly for what you'd be getting. But... these boosts could be used whenever: starts, going really fast for a short period of time, etc.).