Another Charger Question
 

I have a Hyperion 720i net3 AD and I am supporting both my 1/8 buggy and my sons SC truck. The charger is great for the house with AC plug, but we have too much down time at the track with just the one charger. I was thinking of upgrading to a multi pack charger. I only need to charge up to 4s. I would like the ability to charge higher than 1C.

I was looking at:

HYPERION EOS0615I DUO III
HYPERION HP-EOS720DUO EOS 0720I SUPER DUO
Any other ideas?

Possibly 2 of the 615

What power supply would be a good match?

Thx in advance
Matt

The older Duo makes 360watts of power and allowing for its ~20% inefficiency, it would need a power supply with ~430watts to run at full power. This charger requires the input voltage of greater than 14.5v to make full power. Its been tested with lower voltage and there's about a 11% power loss or ~160watts per channel. Thats still a lot of charging power. A single 5000mah 4S requires 168watts at 2C.

The SuperDuo makes 500watts per port or a total of 1000watts. It requires a 24v power supply with ~1200watts output to run at full power. There are a few higher power chargers with this kind of power level available, but there's not really an RC oriented solution for a power supply yet. A lot are using a pair of 12v PC server power supplies wired in series to supply 42 - 47amps at 24v. But these can have potential safety issues.

This would run the older Duo at 320watts since its lower voltage than 14.5v-

http://www.amainhobbies.com/product_...-138V-40A-520W

This would meet the older Duos need for 14.5+v input but has only 350watts. Thats run the charger at ~280watt or 140watt per channel.

http://www.progressiverc.com/index.p...emart&Itemid=1

This could run either the older Duo at full power and the SuperDuo at close to full power -

http://www.maxamps.com/Power-Supply-24V.htm

Thx for the help Duster

Anytime, glad to help out.

If you're comfortable working with wiring and soldering, the options with the PC server supplies will cost less. Some like a 'finished' type power supply like those linked above.

I've been using a IBM PC server supply - it required soldering wires in the right slots on teh supply and connection for the charger, but for less than $50, 12.2v and 42amps has charged anything I've needed to.

Depends on what rate you want to charge at (or might in the future), but generally a Duo3 (or a 3+) should be fine. The super duper duo is mostly needed for larger cell count batteries.

The Duo3 is capable of charging a 5000mAh 4S at just over 2C (the 3+ over 3C), on each port. Added to your existing 720 either should be fine for what you describe.

I also race with my Team Driver. Typically two 1/10 scales and one 1/8 together. We have a Duo3, rarely need to pull out another charger.

3 total channels of charging, all with good power, should be a breeze for 2 vehicles like you describe.

If you do go ahead and get a Super Duo, you still don’t need a huge power supply unless you charge at very high rates, even then you won’t need the full 1000 watts because you will be current limited. The highest you can possibly go with a 4S is 336 watts per channel, charging at 20 amps (~4C depending on the exact battery), half that with the 2S. Unless you might have larger cell count batteries in the future for some reason of course.

Good luck, sure is fun to race with the kid, eh? :D

I am comfortable with building a power supply, but I already have to drag enough crap to the track. So I am going with Maxamps power supply, due to it size, weight, and power.

I also just ordered the super duo. This way if I decide to get silly and start running 6S like all the kool kids, I don't have to buy more equipment.

Taking to boy to the track is a blast. Now if I could him to do his own maintenance.:)

Let us know what your impression of the MA power supply is - its one I may be interested in.

Is it just me or does the Maxamp PS looks like a server PS in shrink wrap? ;)

http://www.maxamps.com/prodimages/PowerSupply_24V.jpg

Exactly what is it, they even specify that they use secondhand supplies

For those too lazy to make their own

Cheers

+1.....somewhere I saw MA discussing this and they confirmed it was exactly that, using two supplies, one with the ground removed and the other's case insulated to prevent poss gnd probs.

Is there a "how to" on building a power supply? N/M found it via google...

Making your own PS
 

Google "How to build a $20 47A power supply."

Can't post the link because I haven't earned that privilege yet I guess.

Try at your own risk. When you wire them in series, a voltage/potential between the cases may exist.

Do some looking at those - read a lot of complaints about how loud the fan is in those. There are some server supplies that aren't so loud and there's a fan modd to slow down the fan in the loud ones and knock the noise down a bit.

Can find plenty of info on RC Groups -

http://www.rcgroups.com/forums/showthread.php?t=1292514


There's more here as well.