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Old 02-16-2011, 11:57 PM   #1
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Default Turnigy Charger at HobbyKing??? too good to be true

Are these two compatible?

Charger w/o power supply

http://www.hobbyking.com/hobbyking/s...dProduct=10708

Power supply

http://www.hobbyking.com/hobbyking/s...dProduct=11758

Should I get this for charging 25C 2s 3000mAh lipo???

Thanks for your help!
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Old 02-17-2011, 12:19 AM   #2
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To get the full power output of that charger you will require a bigger power supply

That power supply will only allow a 50 watt charger output

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Old 02-17-2011, 02:06 AM   #3
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How did you figure out how much the power supply allows?
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Old 02-17-2011, 02:21 AM   #4
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Sorry miss read that its actually a 75 watt supply

Volts times Amps = Watts

15 volt, 5 amp power supply = 75 watts

The charger you linked needs a 240 watt power supply (190 watt output plus 20% for losses) to reach its full potential

That would mean 12 volts at 20 amps

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Old 02-17-2011, 02:26 AM   #5
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If I want to have non stop run time at the track, which charger is good?
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Old 02-17-2011, 02:52 AM   #6
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Quote:
Originally Posted by looklikeaflip View Post
If I want to have non stop run time at the track, which charger is good?
You need more battery packs then...
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Old 02-17-2011, 03:21 AM   #7
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How long does it take for a 25C 4000mAh lipo to charge at a 5C rate?
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Old 02-17-2011, 03:26 AM   #8
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15 minutes from empty

The battery has to be able to handle a 5C charge rate though, not all can

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Old 02-17-2011, 03:42 AM   #9
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So I think I've finally chosen my charger.

http://www.hobbyking.com/hobbyking/s...dProduct=15143

How do I know which power supply to choose?
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Old 02-17-2011, 04:09 AM   #10
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You will need a 500 watt power supply to get full power output of that charger

You need a 15v/35amp or 18v/30amp supply

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Old 02-17-2011, 04:14 AM   #11
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The extra 100 watts is for safety reasons?
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Old 02-17-2011, 04:24 AM   #12
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Im using these and I can charge at 5A and never have any problems
http://www.hobbypartz.com/60p-dyc-1004.html
&
http://www.hobbypartz.com/77p-ac001-powersupply.html
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Old 02-17-2011, 05:00 AM   #13
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Chargers are not 100% efficient, they are typically tested around 80% efficiency, meaning they need ~20% more input power that the expected output power. Thats the reason for teh extra wattage. If you're going to run a high power charger, it doesn't hurt to have extra wattage or a higher voltage. The extra wattage lets the PS work at a little lower duty cycle and tehhigher voltage lets it run cooler.


I was interested in getting one of these myself until I saw the reviews on RC Groups. I hope the charger has gotten better, but doesn't appear that way (look at last page) -



http://www.rcgroups.com/forums/showt...ga+400w&page=6
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Old 02-17-2011, 05:03 AM   #14
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Quote:
Originally Posted by looklikeaflip View Post
The extra 100 watts is for safety reasons?
Most good quality power supplies only put out about 80% of its rated wattage, so a 500watt PSU can only put out 400watts under normal operating condition.

But you can buy so called truepower (80 plus bronze, silver or even gold) computer PSU which can put out very close to its rated wattage and mod it into a PSU for your charger.
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Old 02-17-2011, 05:07 AM   #15
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Quote:
Originally Posted by RCaddict0 View Post
Im using these and I can charge at 5A and never have any problems
http://www.hobbypartz.com/60p-dyc-1004.html
&
http://www.hobbypartz.com/77p-ac001-powersupply.html
Cheap as they come
I hope you purchased a good home insurance for the money you saved, the power supply can only put out 60watts whereas the charger is capable of pulling 111watts charging a 6S lipo at 5A...
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