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HomeAircraftHelicopterMain Discussion › Are there any advantages to parallel power supplies?
03-11-2015 09:16 PM  3 years agoPost 1
McKrackin

rrProfessor

Lucasville,Ohio

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I was just wondering since my charger was maxing out at 30 amps earlier.
I had two chargers going at once on the same supply.
I had a 2S pack going at 10 amps and four 5000mA 6S packs going at 40 amps but the one on 40 would only reach 30 amps.

It may just be because the packs started at 50%
But it got me thinking...would two supplies in parallel work any better?

I ask because I like the 18 volt supply and I want to stay there since my RX pack charger has an 18 volt max input.

Not a real big deal since the Rx pack will fly several flights and will likely only be charged once for every day of flying.

But anywho......???

I literally never use the word literally right.

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03-11-2015 09:52 PM  3 years agoPost 2
RM3

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Killeen, Texas - USA

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not a good idea to simply hook up power supplies in parallel unless they are designed to be.

switching supplies especially dont like being hooked up this way due to thier feedback loop that maintains a regulated voltage output which is read or sensed from the output itself. So the supply must be designed for this in mind. any technical documentation will indicate if the supply can be set up in what is known as a redundant configuration... which is basically parallel. otherwise you may need to include a high current diode from each to prevent backfeeding.

this link provides more information about how to hook them up to accomplish this... look at figure 2 in particular and notice the diodes on the outputs.

http://www.electronicproducts.com/P...ly_outputs.aspx

showing a preference will only get you into trouble, 90% of everything is crap...

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03-11-2015 09:53 PM  3 years agoPost 3
ssmith512

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Indianapolis, IN USA

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It can be done. You will increase amp output. BUT, you cant use any 'ole power supply. If not done properly, you can either electrocute yourself or blow up your house.

Lots of info via that internet thing. Not worth it in my opinion. Best to buy a higher output power supply.

Steve

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03-11-2015 10:24 PM  3 years agoPost 4
Gregor99

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Western Wa

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I run two 48v supplies in parallel to increase the total wattage to the charger. This configuration DOES REQUIRE connection of the load sharing pin between the two supplies. If the supply does not have a load sharing pin, do not run them in parallel.

In your case you may be hitting the charger's input current limit, or the maximum wattage limit of the charger. Depending on which you are hitting, it may be possible to increase the output, usually by raising the input voltage. Which charger is this?

Revolectrix Beta Team

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03-11-2015 11:24 PM  3 years agoPost 5
Andy from Sandy

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Bedfordshire, UK

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From what I understand the high power chargers for 6S need around 26 volts to achieve maximum power output.

As you are running the charger on a lower voltage than the pack the chargers internal inverter has to increase the voltage at the cost of output current.

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03-12-2015 04:38 AM  3 years agoPost 6
EEngineer

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TX

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This configuration DOES REQUIRE connection of the load sharing pin between the two supplies.
Or, when in parallel, ensure that the negative of the PS's in parallel are connected together....at a minimum.

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03-12-2015 05:08 AM  3 years agoPost 7
McKrackin

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Lucasville,Ohio

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Yeah,I'd say it's just a low voltage thing.
Since I was considering buying another supply anyway,maybe I just get a 24 volt one and use the 18 volt for smaller chargers or I could charge two 6S packs at a time while I fly. 30 amps would rock two packs at a time. That's 3C.

I literally never use the word literally right.

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03-12-2015 05:14 AM  3 years agoPost 8
McKrackin

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Lucasville,Ohio

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Sorry for the late reply by the way.
My daughters dog died this morning and it's been a rough day.
He did not go quietly or peacefully. Poor little guy.
Woke us up crying at 2am and died at 6:30am.

I finally fell asleep about two minutes after posting here and just woke up. Now I'll be up all night again

Just so you know I wasn't blowing off the thread.

I literally never use the word literally right.

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03-12-2015 05:34 AM  3 years agoPost 9
EEngineer

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TX

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Try two PS's in series....yours has a variable output voltage, but 18V max....

Tune two in for 12V each....connect in series...and your charger will "see" 24V at 30A max.

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03-12-2015 05:36 AM  3 years agoPost 10
McKrackin

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Lucasville,Ohio

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Then I have to rewire it every time I use the second charger and I would no longer be able to charge 2S and 6S packs at the same time.

I literally never use the word literally right.

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03-12-2015 05:37 AM  3 years agoPost 11
McKrackin

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Lucasville,Ohio

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And I think my supply voltage can only go as low as 13.4 volts.

I literally never use the word literally right.

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03-12-2015 05:46 AM  3 years agoPost 12
EEngineer

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TX

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charge 2S and 6S packs at the same time.
Didn't know that was a requirement....

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03-12-2015 05:53 AM  3 years agoPost 13
EEngineer

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TX

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From what I gather, you have a 18V, 30A variable output voltage PS whose output voltage can be manually adjusted between 13.4V and 18V....right?

And you want to charge both 2S and 6S packs simultaneously....

With the charger that you have....correct?

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03-12-2015 06:00 AM  3 years agoPost 14
McKrackin

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Lucasville,Ohio

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Two separate chargers...But,yes.
I need to charge my 6S and 2S packs simultaneously.

I literally never use the word literally right.

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03-12-2015 06:01 AM  3 years agoPost 15
McKrackin

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Lucasville,Ohio

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I think I just need a bigger supply for the big charger.

I literally never use the word literally right.

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03-12-2015 06:05 AM  3 years agoPost 16
McKrackin

rrProfessor

Lucasville,Ohio

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Then again,the charger may have limited the current because the packs were already at 50% charge. Or more...I didn't really look.

The last time I used it,the packs were at 30% and it hit 40 amps.

I literally never use the word literally right.

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03-12-2015 06:29 AM  3 years agoPost 17
McKrackin

rrProfessor

Lucasville,Ohio

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Looking into it...My 1080 watt power supply is limited to 18 volt output.
To get one identical to it to run parallel is $130

A 1200 watt 24 volt supply of the same brand and almost identical in appearance is $145

Problem is,that one is overseas so there's going to be a bit more than a $15 difference but not much more.

Since I planned to have two supplies anyway,maybe the best bet is the 1200W 24V supply and just use one supply on each charger.

Just seems a waste to use a 1080W supply for a 200W charge.

Or drop back from a 700 to a 600. 30A would be killer with 3000mA packs

I literally never use the word literally right.

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03-12-2015 06:43 AM  3 years agoPost 18
BobOD

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New York- USA

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Sorry about the dog. My condolences.

It would help to know what PS and chargers you have. Sorry if this has been given but I didn't see it...just skimmed the thread. I'm tired.

As noted, putting power supplies in parallel isn't a good idea unless they are designed for it (not likely).

One thing you could do is put 2 in series. This will give you 36v for the bigger charger. And up to 2160W if you ever get a second charger...or a bigger one. Of course this assumes your charger for the 6s takes 36v.

You can hook the smaller charger for 2s across just one of the supplies so it'll run at 18v...up to 1080W.

Team POP Secret

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03-12-2015 06:45 AM  3 years agoPost 19
McKrackin

rrProfessor

Lucasville,Ohio

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It's a Turnigy 1080W supply.
The chargers are a Powerlab 6 and a 200W Turnigy Mega.

The Turnigy charger has a max input of 18V and I think the Powerlab has a 24V max.

It's essential that I run both chargers simultaneously.

Thanks for the condolences. It's always rough.
He was my daughters buddy and my grand daughter liked him too.
Excellent kid's dog.

I literally never use the word literally right.

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03-12-2015 07:16 AM  3 years agoPost 20
BobOD

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New York- USA

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The Powerlab6 takes up to 32v.
It's rated 1000W at 30v input, 400w at 12v input. I'd be surprised if you could charge at 40A running it at 18V.

You could get a second 1080W power supply and set them to 15v and run the Turnigy off one and the Powerlab across both. But, this depends on if the Turnigy power supply has isolated outputs or not. It the neg output terminal is connected to the ground or neutral pin on the input plug, or to the case, you can't put them in series. Check with an ohm meter.

OR, you can just get a 200W supply for the 2s charger. You'll still be limited to less than full capability of the Powerlab though.

I love the black and white pic. Great shot.

Team POP Secret

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HomeAircraftHelicopterMain Discussion › Are there any advantages to parallel power supplies?
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