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HomeRC & Power✈️Aircraft🚁Helicoptere-Electric Battery-Charger-pSupply › connecting packs in serie
02-22-2010 09:58 AM  10 years ago
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heliup

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Barcelona, Spain

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connecting packs in serie
I have a question about loose of performance

nowadays people use packs of 3s for a 450 and then connect them in serie to fly a 500.

In the same way, they fly 6s 2650 mAh in a 500 heli and then connect them in serie to fly a 600 heli.

I have seen this and I realise that there's more performance in a 500 using a single 6s pack that put 3s2packs.

would be the same if someone can fly a 12s real pack in a 600? there would be more performance (because of more watts) than flying with the annoying 6s2packs?

it's true that webs can't sell packs over 6s because of shipping policies?
logo 500 3D, mini titan, atom 500
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02-22-2010 05:42 PM  10 years ago
Busher

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Manchester, England

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would be the same if someone can fly a 12s real pack in a 600? there would be more performance (because of more watts) than flying with the annoying 6s2packs?

Absolutely !

Less overall resistance results in more power available. I have never really seen the difference that much as I don't fly balls out all the time.

I am not sure about shipping regs but moving things about above 50volt is a very big potential hazard if you don't consider the safety aspects. 50v is considered a maximum voltage for general safe use in the UK it could be different in other countries.
Good luck
Busher
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02-22-2010 05:59 PM  10 years ago
Rogman88

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West Monroe, LA

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would be the same if someone can fly a 12s real pack in a 600? there would be more performance (because of more watts) than flying with the annoying 6s2packs?

A 6S2P system (at least I was told) is essentially two packs in parallel at 22.4 volts. So even though you are running 12S total you are still drawing the amps of a 6S system.

A true 12S setup (44.4v) which is I guess a 12S2P setup will be drawing half the amps of the 6S2P (22.2v) system that could theoretically be using the exact same batteries.
It's all how you wire them and kv motor you use. Lower kv allows you to use true 12s (44.4kv) setup.

For example two 3000mah packs in parallel on a rex 600. Your voltage is only 22.2 so you have to use a higher kv motor (ie scorpion 4025-1100) to get to the rpm needed to fly a heli.

Take the same batteries and set them in series for a true 12S 44.4v setup. You have to now go to a lower kv motor like scorpion 4025-630 to power your system becuase the rpm would be too high (at 1100kv). RPM is volts of pack times kv of motor then you have to figure the gearing, too much for this post.

So when you say your 3S2P doesn't run your 500 like a true 6S pack. It's because your running 11.1 volts instead of 22.2v to maintian the rpm necessary to give adequate power.

Sorry to use 600 example then go to 500 but I'm familiar with 600 and not 500. Priciples are the same. I did this 600 conversion on my heli by the way. It works much better too! Packs are cold comning down and heli is almost unbogable
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02-22-2010 06:59 PM  10 years ago
heliup

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Barcelona, Spain

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sorry about my bad battery notation, I mean 2 packs connected in serie. Nothing about connecting packs in parallel, I know this is for having more mAh.

So I have understand that connecting packs in serie gives you the same Amperes that with only one pack? but we solve this nowadays having more voltage (12s2p) thus we have Watts enough to run a low kv motor.

It would be better if batteries could be shipped connected interiorly. Because the is less resistance, the double of amperes and then better performance?

About the resistance, could be the wires that have the conductivity factor(or coefficient) lower that the interior connections?

for example we could use a 8s pack with the same performance of 2 packs of 5s connected in serie, the notation would be(10s2p), because with the second we are loosing many W.

there're people that say that a 6s is the same performance that 6s2p (same mAh and same Cs) but I'm not agree, I see in the flights camps that 6s2p works with less performance than true 6s (same voltage 22,22V 6s2p, "true" 6s).

by the way, I've been looking for information about this and it's true that shipping companies have policies about batteries, for example you can see it here:

http://www.fedex.com/es/about/enews...09article6.html
http://www.ups.com/content/es/es/re...&srch_phr=litio

the second link says something like there are batteries that can't be shipped even with safety options.

so, we the pilots are loosing performance because of the shipping? mm.. I understand that safety it's the most important.
logo 500 3D, mini titan, atom 500
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02-22-2010 11:25 PM  10 years ago
Reesy

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In the doghouse ... Nottingham UK

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I think you are mistaking P with S

Say I have a pack which is 6S1P (22v and 3000mah) and weight 600grams if I make those 6S2P I will have 22v and 6000mah) double flight time but now my pack weighs 1200grams so heli won't fly as well.

I run 10S1P 4000mah in my 3DMP (actually 2 x 5S1P in series as they are easier to charge and balance.) which is 600 size

In my logo 500 I run 7S1P ( 4S1P and 3S1P in series ) as finding a 7S pack isn't easy.

I run 7S as it suits my Kontronik tango10 and Jazz 55 10 32

If I ran the "normal" 6S I would have higher amps (less voltage) which might be a little too much for the Jazz.

Putting 2 packs in series makes negligible difference and they are MUCH easier to charge and balance

Hope that helps
Paul
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