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› 12vsource battery
03-08-2008 08:23 AM  10 years agoPost 1
u.k. sailor

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cambs uk

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can somebody please tell me what sort of amp hour capacity I would need to recharge say a 12s 4000 ma battery 6 times at the field?
I am trying to get a feel for the size of battery I would need to get a days flying. THanks

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03-08-2008 08:47 AM  10 years agoPost 2
Drunk Monk

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Preston, UK

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If your battery holds 4A (4000ma) and you want to recharge it 6 times then you would need something with at least 24A. Car battery would do it .


Stephen

I only open my mouth to change feet.....

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03-08-2008 09:44 AM  10 years agoPost 3
nivlek

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Norfolk England

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If your battery holds 4A (4000ma) and you want to recharge it 6 times then you would need something with at least 24A. Car battery would do it .
Car batteries , although they have a high capacity , don't like being deeply discharged . If you are talking about 12 lithium cells then you will be looking for a 120AH battery as a minimum !
If you are talking 12 nicad/nimh cells you would still need at least a 40 AH Battery .

You ideally need a leasure or marine battery , designed for deep discharge .

At the end of the day , it gets dark .

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03-08-2008 10:24 AM  10 years agoPost 4
u.k. sailor

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cambs uk

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thanks for the replies I am talking LIPO batts and had a feeling it was going to require a beefly battery to supply the necassary.
So should a deep discharge battery of 120AH in theory give 6 charges on 12s 4000ma flight pack?

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03-08-2008 10:53 AM  10 years agoPost 5
Drunk Monk

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Preston, UK

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Actually I think it's more likely 144Ah which is a hell of a battery lol and that will run the battery flat which isn't good, so leaving 20% in a battery would mean you would need about 180Ah. As an example a heavy duty car battery is about 100Ah. That's a lot of juice. Might be easier getting a little generator or charge from a car battery with the engine running


Stephen

I only open my mouth to change feet.....

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03-08-2008 10:57 AM  10 years agoPost 6
fergus

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Ireland

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I was in the same situation a while back. I got a 1000w generator instead of the marine battery. Its more expensive but alot less weight and hassle. You would have to charge the marine battery at the end of the day as well remember. Take a look at the Honda EU 10i

Regards

Fergus

Regards

Fergus

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03-08-2008 11:09 AM  10 years agoPost 7
fergus

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Ireland

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heres the maths if your interested:

50.4v x 4A= 201.6watts x 6charges= 1209.6watts

1209.6 / 12 = 100.8Ah battery + 20% for losses and to keep something in the battery = 126Ah minimum I would allow another 20% above that as well.

Regards

Fergus

Regards

Fergus

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03-08-2008 01:46 PM  10 years agoPost 8
Dr Lodge

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Guildford, Surrey - UK

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Graham, for charging packs like that multiple times at the field I would either invest in 2 or 3 leisure batteries since 1 the size you need is going to be too heavy to handle, or a generator.

The Halfords 60Ah LEISURE battery is about as heavy as I'd want to go, may be 70Ah. If you had two 70Ah batteries, and wired in PARALLEL to get minimum voltage drop, that may do it.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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03-08-2008 02:41 PM  10 years agoPost 9
u.k. sailor

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cambs uk

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yeah I was concerned about the size weight of the larger capacity batteries in/out of the car for recharge. A generator does sound like an alternative but I was concerned in case other club members didn't like it being run (noise) the plankies can be funny sometimes. Also I had thought of them being a bit big and heavy as well. still might have some other uses in a power cut I'll look into it thanks for the help

I must say I like the quiet smoothness of the electric heli

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03-08-2008 02:43 PM  10 years agoPost 10
u.k. sailor

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cambs uk

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Is there any problem with hooking up one of our chargers to a generator? and do they all give out a "smooth" enough power to keep the charger doing it's thing happily?

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03-08-2008 02:44 PM  10 years agoPost 11
cdrking

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Seattle

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The perfect battery. http://www.hondapowerequipment.com/...delName=eu1000i

To hover is divine, the alternative is rather PLANE.

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03-08-2008 02:56 PM  10 years agoPost 12
Drunk Monk

rrProfessor

Preston, UK

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I think that's the geny (or something very similar) we take to our field. Works great and is really quiet and light. Good for plugging stereos into too


Stephen

I only open my mouth to change feet.....

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03-08-2008 03:51 PM  10 years agoPost 13
JEEPWORLD2002

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BLUEBELL PA USA

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I got a die hard deep cycle batt. They had 3 sizes when I got mine I got the biggest. I can charge off of it from full for 2 or 3 weekends with charging 2-3 times a day with 6s pack. here is a link for the one i have. But there are better ones out there like a sprial cell and gel cells.
http://www.sears.com/shc/s/p_10153_...arine+Batteries

Trex600n Trex500 Mikado LoGo5003d// Hacker, CastleCreations,Ys 50, JR 7703d/8900, Radix

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03-08-2008 03:56 PM  10 years agoPost 14
fergus

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Ireland

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Cdrkings pic is the genny I use and is very quite. Don't worry about noise it is quieter than most 60 nitros.

Its the Honda 1000i in the US where it outputs 110volts and in Europe it is the Honda 10i and outputs 220volts. It does output a clean sign wave and works fine with our chargers. You will need to bring your power supply to the field though as the 12volt output on these generators is not up to the task - you have to work off the mains output.

Regards

Fergus

Regards

Fergus

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03-08-2008 04:02 PM  10 years agoPost 15
JEEPWORLD2002

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BLUEBELL PA USA

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my cheap louder pepboys 2000 watt gen which cost 200$ can give 110/12v out put up to 20 amps i think the 12v will do. Cant believe that the honda doesnt have both ac and dc they are nice where you can link 2 togather and double out put

Trex600n Trex500 Mikado LoGo5003d// Hacker, CastleCreations,Ys 50, JR 7703d/8900, Radix

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03-08-2008 04:16 PM  10 years agoPost 16
fergus

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Ireland

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The Honda has a 12volt out but it is only rated for 10amps. Thats only 120watts which is not much good when charging a 12s 4000mAh pack as UK Sailor is looking for.

Regards

Fergus

Regards

Fergus

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03-12-2008 05:56 PM  10 years agoPost 17
cwd10

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PA, - U.S.A.

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This: http://europe.optimabatteries.com/p...deep_cycle.html is what you want. Proven technology, works great. It's expensive, but will last long enough to pay for itself when compared to other batteries.

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03-12-2008 06:23 PM  10 years agoPost 18
Rob_T

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..

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Optima make good batteries, but I don't think their product line includes the 120AH or larger battery needed for this job.

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03-12-2008 07:17 PM  10 years agoPost 19
u.k. sailor

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cambs uk

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thanks for the input the honda is a bit pricey for me to use while dipping my toes in the electric arena so no decisions made yet are there any good alternatives?

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03-12-2008 07:29 PM  10 years agoPost 20
nivlek

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Norfolk England

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I purchased a cheap generator , for under £50 . It has a maximum output of 800 VA , and also has a 12V output . I have used it to run a switch mode PSU (240V AC in), and ran a charger off of that . So if you bought a suitable psu , a similar generator would do fine .

At the end of the day , it gets dark .

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