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Home › ✈️Aircraft › 🚁Helicopter › Tools and Field Equipment › Power supplies?
09-15-2009 12:31 AM  11 years ago
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thenewguy

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Corvallis, Oregon Where there is liquid sunshine!

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Power supplies?
I was think about one of these to power 2 Astro 109 chargers. What do you think? http://www3.towerhobbies.com/cgi-bi...?&I=LXWGU8&P=ML

Thanks Chris
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09-15-2009 04:10 PM  11 years ago
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JuanRodriguez

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The Villages, Florida

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More importantly,

What batteries will you be charging with the two chargers (cell count, etc,)

AND,

At what charge rate ??
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09-15-2009 07:15 PM  11 years ago
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thenewguy

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I have 2 outrage 4s 2200 mah that I charge at 2 amps and 1 fromco 5200 that I charge the same.

Chris
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09-16-2009 02:48 AM  11 years ago
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JuanRodriguez

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It would seem to me that the power supply you're looking at should be OK based on the charge rates you're describing....

But, I'll let one of the "experts" confirm or refute that.....

In other words, I don't feel confident enough for you to take what I said "to the bank"....
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09-16-2009 02:57 AM  11 years ago
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GyroFreak

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Orlando Florida ...28N 81W

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That power supply puts out 300 watts.
I'm not clear on your configuration but you said you have two chargers, so the 4S 2200 Lipos are 35 watts, the 5200 Lipos is 83 watts. So any combination does not exceed the 300 watts. You are good to go and will have plenty of head room to move up to larger cells.I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?
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09-16-2009 02:58 AM  11 years ago
0Post 6
thenewguy

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Thanks, Juna I appreciate your honesty.

That's good to know Gyrofreak.

Chris
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09-16-2009 03:02 AM  11 years ago
0Post 7
GyroFreak

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Orlando Florida ...28N 81W

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By the way, I use a 25 amp 12 V supply also for my charging of 10S 5000 mah which is about 220 watts consumed, throw in some charger losses and I am at 250 watts. My supply worked well but it got really hot so I added a small fan and it stays nice and cool. You won't have that problem at the low level you are at now, but keep it in mind if you or someone else wants to start charging 10S at 5 amps.
PaulI think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?
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09-16-2009 03:02 AM  11 years ago
0Post 8
thenewguy

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Stupid question, how do you figure the wattage per battery?
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09-16-2009 03:07 AM  11 years ago
0Post 9
GyroFreak

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Not stupid at all. Watts is Volts times Amps. Take the charge rate you want to use in amps, and multiply by battery volts. I use about 4 volts per cell.
So if you want to charge your 2200 3S at a 1C rate then the charge rate will be 2.2 amps X 16 Volts (4S) = 35.2 watts.I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?
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09-16-2009 03:09 AM  11 years ago
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thenewguy

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Thanks, something else to add to the old brain.

Chris
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09-16-2009 03:16 AM  11 years ago
0Post 11
Ace Dude

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USA

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Take the charge rate you want to use in amps, and multiply by battery volts. I use about 4 volts per cell.
So if you want to charge your 2200 3S at a 1C rate then the charge rate will be 2.2 amps X 16 Volts (4S) = 35.2 watts.
Additionally, no charger is 100% efficient so add another 20% or so for efficiency losses. The best chargers are about 90% efficient and the worst ones about 70-80% efficient.

35.2W x 1.2 = 42W  
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