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04-03-2012 11:02 AM  9 years ago
steve 01

rrProfessor

Grand Rapids MI

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200 watt dual 2 so 400 watts total
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04-03-2012 02:29 PM  9 years ago
rocket_33

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Mount Pleasant, Michigan USA

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Steve,

Let me go through this and we can see what's happening. My thought is it may not be the power supply it may be the charger.

You said your charge puts out 10 amps per side earlier but then said it is 200 watts per side. Therefore its true limit is the wattage being 200.

To put out max amps (10) but not exceed 200 watts, the highest voltage level is 20 volts. If you are charging a 6S pack, it will never be able to put out full amps even at the start of initial charge of a discharged pack

6S * 3.7v per cell = 22.2 volts
22.2 volts * 10 amps = 220 watts.....assuming 100 percent efficency that exceeds the maximum output of 200 watts on the charger.

200 watts / 22.2 volts = 9 amps max. but again this is with a fully discharged lipo. Nominally at 4 volts per cell, 24 volts, your charger would have to throttle back to 8.3 amps.

So unless you are charging a pack that is less than 6 cell, you will never get the full 10 amps per side on the charger.

As far as your power supply, you said it is a 40 watt. Assuming it is a 12 volt supply, it should have enough to handle your charger (480 watts). You lose a bit of efficency because the charger has to step up voltage (from 12 to 25.2 for fully charged pack). Ideally you would be better with a 24 volt output power supply. If you had this, you would only need a minimum of a 16 amp power supply.

Hopefully my long windedness helps you out
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04-03-2012 03:40 PM  9 years ago
sonnyhad

rrProfessor

Holland,Mi

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I don't know about Steve but that stuff seems complicated! It seems to make sense the way you have it spelled out there Randy, I always wondered why my charger would stop at 9 amps when charging instead of the 10 it says its supposed to charge at. I guess if I have any electrical questions, you da man to come to with them.Bald Pilots usually wear hats!
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04-03-2012 03:57 PM  9 years ago
rocket_33

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Mount Pleasant, Michigan USA

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It seems that way but once you understand it, you don't get drawn in by all the advertising hype. Also, you end up with a system that can handle all of your needs without being stressed.

I will try to answer what I can
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04-03-2012 05:15 PM  9 years ago
OldNewbie

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Middleville, MI

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If anyone is interested in making a charging rig with some deep cycle batteries the last time i was in Menards they had Exide 105ah deep cycles on sale for $55 each which is the cheapest I've ever seen for deep cycle batts. $110 would get you a 24V charging system for the field. Not sure how many packs you can charge with type of rig but it should be enough for an afternoon of flying assuming you fly some nitro too
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04-03-2012 07:06 PM  9 years ago
sonnyhad

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Holland,Mi

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Jay, hows your hand doing? Hope it heals up soon, I forget when you said you needed to see a surgeon.Bald Pilots usually wear hats!
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04-03-2012 07:08 PM  9 years ago
HeliSam

rrApprentice

Michigan

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Ok so I have a quick question: I'm dissembling the tail on my fury and the tail gear in the back gave me a hard time as I tried to get it off. All of the screws were out and everything. Does this mean my tail shaft is bent and I need to get a new one?
Thanks
Sam
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04-03-2012 07:10 PM  9 years ago
critter4ya

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grant, mi- USA

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If I'm understanding it right I would be fine with the 2 15a chargers and the 1000w power supply I planned for my 4400 w generator Glenn
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04-03-2012 07:13 PM  9 years ago
critter4ya

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grant, mi- USA

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Sam, if you've already got the belt off just spin the shaft. You can usually see if it's bentGlenn
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04-03-2012 07:14 PM  9 years ago
sonnyhad

rrProfessor

Holland,Mi

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It sounds like it Sam. If you do get it out, roll it on a flat surface, and if it wobbles, you know for sure its bent. But when the set screw from the gear is out, it should slide out of the bearing pretty easy.Bald Pilots usually wear hats!
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04-03-2012 07:17 PM  9 years ago
rocket_33

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Mount Pleasant, Michigan USA

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If I'm understanding it right I would be fine with the 2 15a chargers and the 1000w power supply I planned for my 4400 w generator
Guess it all depends on what you are charging and what you want to do.

How many Watts is the charger capable of? Watts not amps will be the limiting factor
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04-03-2012 07:17 PM  9 years ago
critter4ya

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grant, mi- USA

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When runnIng there is a bit if heat in the shaft so they expand and contract and will sometimes stick. Or sometimes no matter how hard you try you might have got a little lock rite in there and it will cause it to stick alsoGlenn
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04-03-2012 07:18 PM  9 years ago
sonnyhad

rrProfessor

Holland,Mi

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Glenn, from that nice informative post Randy did, you will be good to go! really need to print that for future reference.Bald Pilots usually wear hats!
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04-03-2012 07:24 PM  9 years ago
critter4ya

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grant, mi- USA

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Yeah I'll be happy as long ans I can charge 2 battery's for the 550 in less than an hour. Only starting with 2 batts and plan for 2 more so I'll have 4 to swap between. More flight time Glenn
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04-03-2012 07:31 PM  9 years ago
critter4ya

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grant, mi- USA

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I know it sounds weird but I'm looking forward to my first 550 crash. It means it's mine, I have it, I've flown it. Crash is basically inevitable so I'm planning for it. Besides when it happens I won't be quite so bummed lolGlenn
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04-03-2012 07:33 PM  9 years ago
sonnyhad

rrProfessor

Holland,Mi

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Glenn, there's something seriously wrong with you! I think you've gone down too many bumpy highways!Bald Pilots usually wear hats!
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04-03-2012 07:37 PM  9 years ago
rocket_33

rrElite Veteran

Mount Pleasant, Michigan USA

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I will toss some more math on you

Here is how I figured out my charging system and gets you close so will use your 550 as an example. Lets say you are running a 6S, 5000 mAh battery.

So battery capacity is 5 amps. Charging at 1C means it will take me an hour to charge. If I charge at 2C, then it will take 30 minutes. If I charge at 4C, then it will take me 15 minutes.

Now the assumpition I am making is you have good packs and can charge at a high C rating.

Back on point. So I want to charge in 15 minutes. This means that I need to have an amp output of 5*4 or 20 Amps. Next the important thing, watts. A 6S pack discharged is 22.2 volts. I like to look more along the lines of the middle point so I look at 4 volts per cell so in this case it would be 24 volts. Now my charger Watt requirement

24 volts * 20 Amps = 480 watts. So your goal would be to have a 500 watt charger.

Ideally your power supply then should be 24 volt, and about 20 Amps. See how it all balances itself out.

With this setup, you could charge your battery for your 550 in 15 minutes appx. Knowing this, you can get an idea how long any particular setup will take to charge a battery
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04-03-2012 07:38 PM  9 years ago
rocket_33

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Mount Pleasant, Michigan USA

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LOL Glen, I have had plenty of crashes but I am not feeling that love that it is mine after a crash hahah
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04-03-2012 07:49 PM  9 years ago
critter4ya

rrKey Veteran

grant, mi- USA

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I haven't bought it yet lol. I'm not planning a 24 v system only because I don't know how to do it and would probably burn my girl friends house down. But if someone tells me whAt to get and would help build it I would do it. I do plan for my charge system to be used by anyone at the field when I goGlenn
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04-03-2012 08:07 PM  9 years ago
BrianApp

rrVeteran

Grand Rapids, MI

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For all this high power charging stuff wouldn't it be better to wire two server power supplies in series to get the 24V? 45amps into 24V would give you 1,000 watts. Keeping the power supply input closer to the charger output should help the efficiency.
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