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› Field Charging 12s battieries
06-07-2009 08:19 PM  8 years agoPost 1
JohnDa

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England, South West

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Could anybody give me a feel for how long it would take to charge say a 5000 12s lipo at the field, I know there will be a few variables, charge rate etc. I am trying to guage the timwe from ennding a flight to letting the batteries cool, re-charge and get back in the air.

Thanks

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06-07-2009 09:38 PM  8 years agoPost 2
TJinGuy

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Socorro, NM - USA

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Assuming 30min to cool down and a max charge rate of 3.5A, would take about 2 hours from end of flight to full charge.

- Chris

Team New Mexico
TJinTech

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06-07-2009 09:46 PM  8 years agoPost 3
MrNiceGuy

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Melbourne, FL

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It really depends on what your charger can do. If you charge it at 1C about an hour to charge, 2C one half hour etc. What charger do you have? I don't really worry about letting my batteries cool too much. Not that I tend to get them that hot. Lipos don't warm up when you charge them like Nimh and Nicd do so I don't believe it's that big of a deal that they are completely cool before charging.

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06-07-2009 09:56 PM  8 years agoPost 4
JohnDa

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England, South West

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Im' looking at the Robbe Powerpeak I4

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06-07-2009 10:25 PM  8 years agoPost 5
QueeQueg

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West Texas

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I've got an Orbit Microlader Pro that charges at 275W max which is getting up there in power for chargers. There are only a few with more power and these are very pricey. At 12S it will charge packs at 4A and takes about an hour more or less depending on state of discharge to refill a 12S 4000mah set of Hyperion G3s. Some batteries take longer. it depends on the the ramp down period. Generally though they are at about 90% full within about 40 to 50 minutes when they have been discharged to about 80%.

Here is something else to know. I can only get 2 charges out of a 120AH deep cycle. It will LV shut down well before a 3rd pack is done. It is pulling something between 25A and 30A to produce 4A at 50V. So your power source has to be up to the task. If you plan on using a similar powered charger with your auto battery you had better keep the vehicle running or it won't start after 2 charges and will wear out the battery quickly if used regularly for even one charge at a time. Don't ask me how I know this

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06-07-2009 10:27 PM  8 years agoPost 6
TJinGuy

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Socorro, NM - USA

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There is no charger I am aware of that will charge 12s 5000 packs at even 1C, let alone 2C. The Robbe is good for 210W, or 4.1A max charge rate. That will take about 70-80min to fully charge a pack.

- Chris

Team New Mexico
TJinTech

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06-07-2009 10:31 PM  8 years agoPost 7
MrNiceGuy

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Melbourne, FL

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You are going to need something substantial to charge 12S. If you use 2 6S packs you can use 2 6 cell chargers. This seems to be what most people I know do. A couple of the new Hyperion 7S chargers would do nicely.

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06-07-2009 10:39 PM  8 years agoPost 8
QueeQueg

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West Texas

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Chris.

The software on most 12S chargers will limit the current at higher cell counts due to rising inefficiency as voltage conversion gets higher. Thats why they have fans and huge heat sinks. You can literally keep your hands warm with them in the winter at the higher voltages. It would be nice if they made them in 24V or 36V input. This would increase their power with these HV packs.

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06-08-2009 02:21 AM  8 years agoPost 9
mike658sr

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Glen Ellyn, Illinois

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I have a robbe Infinity 3. With this charger I'm limited to 180 watts so the maximum I can charging my 12s at is around 3.2 amps and it takes around 80 minutes.

I'm saving up for my next charger that will do everything. Check these out!
Shultze next 7.36-12
Universal charger / discharger
1-36 Ni-, 1-14 Li-cells
With integrated balancer for up to 12 Li-cells
Output 1: 7 A
Output 1: 3 A

Or,

Shultze next 10.36-12
Universal charger / discharger
1-36 Ni-, 1-14 Li-cells
With integrated balancer for up to 12 Li-cells
Output 1: 10 A
Output 2: 5 A

http://www.schulze-elektronik-gmbh.com/index_uk.htm

Living the dream!

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06-08-2009 02:53 AM  8 years agoPost 10
TJinGuy

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Socorro, NM - USA

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My suggestion would be to never buy a 12s pack. They are hard to charge and expansive to buy. Why not just buy 6s or even 4s packs and run them in series. Then you can have a pair of smaller charger which cost less and have more power output capabilities. Also if you crash and tear up the battery, you will likely only damage one of the packs and not the whole thing.

Actually there is pretty much no benefit to using a 12s pack over a pair of 6s packs, at least not that I can think of.

- Chris

Team New Mexico
TJinTech

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06-08-2009 03:20 AM  8 years agoPost 11
mike658sr

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Glen Ellyn, Illinois

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You're absolutely correct. No reason for 12s except convenience for me when pulling it in and out of a tight fitting heli. I get my 12s for $375ea. and my charger can handle it. So I have no big price advantage. If I were to go with 6s I would invest in another charger like the Hyperion Duo even though I'd be able to charge 2x 6s in series with the robbe I3

Living the dream!

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06-08-2009 03:48 AM  8 years agoPost 12
QueeQueg

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West Texas

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I only buy 6S packs myself now. And if I ever fry this Orbit or need more charging capacity I'll get a couple smaller chargers or a Hyperion. I've Had the Orbit for about 5 years now. It has out lasted every other charger I've owned. Including my Schulze which caught fire when the + terminal charge lead touched the frame of the truck I was using the battery from While they have reverse polarity protection on the outputs they don't between the inputs and the outputs. Something the does have

Except for my TR450 everything I fly is either 12S or 6S so I use the same packs.

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06-10-2009 09:12 PM  8 years agoPost 13
JohnDa

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England, South West

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The intention is to use two 6s packs not one 12s (sorry should of stated that), so is 2 6s packs quicker to charge than one 12s ? applogies if this seems a dum question but i really want to get in to elctric instread of nitro.

Thanks

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06-10-2009 09:21 PM  8 years agoPost 14
QueeQueg

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West Texas

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If you use 2 chargers at the same time 2 6S packs will be quicker to charge.

If you have packs that can be charge at higher than 1C you could charge two packs in about 30 minutes with some of the i chargers mentioned above.

But if you start using 2 high powered chargers you'll need a serious power supply or a serious deep cycle lead acid.

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06-10-2009 09:29 PM  8 years agoPost 15
JohnDa

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England, South West

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I was looking at somthing like then Hyperion EOS 0615i DUO3, don't really want 2 chargers, would prefer 1 that can to 2 6s at once.

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06-10-2009 09:44 PM  8 years agoPost 16
TJinGuy

rrProfessor

Socorro, NM - USA

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Just remember that you can charge a pair of 6s packs on any charger that will charge 6s packs, you just have to wire them in parallel. It is not a complicated thing to do and opens up a lot more options.

- Chris

Team New Mexico
TJinTech

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06-10-2009 10:59 PM  8 years agoPost 17
JohnDa

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England, South West

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Chris,

So what your saying is i could charge 2 6s packs at the same time on say a cellpro 10s charger ?

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06-10-2009 11:16 PM  8 years agoPost 18
TJinGuy

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Socorro, NM - USA

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Absolutely. You just need the right wiring.

- Chris

Team New Mexico
TJinTech

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06-11-2009 08:39 AM  8 years agoPost 19
JohnDa

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England, South West

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so using say a charger such as the cellpro 10s doing two packs in parrel how will that affect times and the tye of power supply needed at the field.

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06-11-2009 02:10 PM  8 years agoPost 20
TJinGuy

rrProfessor

Socorro, NM - USA

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Time will depend on the output of the charger. If you are looking to charge a pair of 6s 5000 packs in parallel then they will be equivalent to a 6s2p 10000mAh pack. A Cellpro 10S attached to a 12V source is good for about 200W. If we take 200W and divide it by 25.2V, the max voltage of a 6s pack, we get about 8A. That is just under 1C charging and should take about 70-80min to charge from 80% depleted.

If you wanted faster then you would need something like a Hyperion Duo or iCharger 208B+. Those chargers can be run off 24V, 2 car batteries, and can output more like 13A to a 6s pack. That would allow you to charge a pack in about 45min.

Want faster yet then grab a pair of 6s chargers like the iCharger 106B+. The cost will still be less than a Duo and give you almost 500W of charging power. Each can charge a 6s pack at about 9A, off a 12V source, or just under 2C. Using two of these could charge both packs in about 35min.

- Chris

Team New Mexico
TJinTech

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