Lumenier RB2205C-12 2400KV SKITZO Ceramic Bearing Motor
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Old Feb 01, 2013, 07:25 PM
mrforsyth is online now
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Good for you Terry!

Charger won't run any cooler on higher voltage though as conversion efficiency of any decent switching DC-DC converter is largely independent of source voltage, despite common misconception.

Mark
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Old Feb 01, 2013, 07:31 PM
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All I can tell you is that my ProPeak Warriors would shut down on over heat when charging a 6S pack at 10A on a 12V supply and on 18V they ran much cooler. Just sayin".
Old Feb 01, 2013, 07:59 PM
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Hence my qualification... "decent switching DC-DC converter".

Attached are some measurements that I took a while back with my i306B. Charger output power is same for both scenarios. Only variable is source voltage.
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Old Feb 01, 2013, 11:00 PM
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I don't see a temperature reading there. Did you measure the temperature? In my example, the ProPeak Warrior was charging at it's rated limit. Looks like your 306B was just cruising. Show me some numbers with the i306B at 30A 1000w output and some temp readings. None of my chargers have trouble at 1/2 their rated output. Just sayin'
Old Feb 01, 2013, 11:27 PM
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As you can see in the chart, the efficiency delta is 1% and a good portion of this is increased resistive losses in the charger input wire due to 2X current draw at 12V. As such, internal power dissipation is effectively identical and heat generation is thus the same. Internal charger temperature as reported by the 306B was identical, as one would expect with the physics involved.

Given that 306B charge output is limited to 500 watts on 12 volt source, the test you propose is not possible. Also, it would be superfluous as DC-DC converter efficiency scaling is linear on all chargers that I have ever measured, even at full rated output. All of my iChargers behave in this manner but I have not tested all brands/models of chargers so I certainly have no data to be suspect of your experience in any way.

Would be curious to know whether my measurements on my iChargers are an abberation.

Regards,
Mark
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Last edited by mrforsyth; Feb 02, 2013 at 01:17 AM.
Old Feb 03, 2013, 04:53 AM
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Running at 12V vs 24V for the same power output draws more amps through the charger's input, about twice as much, up to the limit the charger actually sets on itself.

Running at this limit heats up the internals quite a bit!

Most chargers state they limit their power at 12V vs higher. Some provide max at 18, others 24 and above. The main reason is the ability to handle input currents, which are higher for the same job at 12V than it is at 24V.

As an example, i run my icharger 208B to discharge lipos it is connected to at input, into a discharge bank. Input is ALWAYS limited to 24-25A, so on a 2S lipo (7.4V) it can only discharge at 180W. However with an input of a 3S lipo, it can put out around 280W, again limited by input current of 24-25A.

On a 6S lipo however, it puts out 348W, which is software limited by it's 350W rating, so it's only drawing around 15A.
Old Feb 04, 2013, 02:21 AM
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Yes, in Marks example, he was only charging at 357W. I didn't know at time of my post that the 306B was limited to 500W when using a 12V input. I still believe that the charger would have shown different results if the test would have been done at the chargers rated limit.
Old Feb 07, 2013, 09:59 PM
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I got a chance to do some testing today with my newly converted power supply and my PL8. I set it up to charge two 6S 6000mAh Nanotech LiPos so I could set it 40A. At 39.9A, 25V output the PL8 drew 45.5A, 25.7V from the power supply. The power supply drew 11.87A, 122V from the house outlet.

Later, I hooked it all up to my Champion 2000 watt inverter generator. At 39.9A, 24.58V output the PL8 drew 44.6A, 25.7V from the DPS-600PB supplies which drew 11.27A, 119.8V, 1365W from the generator.

All in all, I am very happy with the power supply. I don't go higher than 6S packs so it should be perfect for my needs. At full tilt it only draws 12A from a 120V household outlet so should never be a problem for me. I am attaching some pics of the day's tests.
Old Feb 08, 2013, 02:46 AM
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Ok a little off topic, but I've recently decided 'smaller' is better...

My most compact build to date - 25V 2000W+ capable, fits in a tiny case (Pelican 1400) and can charge and remain cool with the lid closed.

Travelling, the case houses the PSUs, PL8, wall power cable, MPA board, a Junsi charger, and another parallel board for that.
Old Feb 08, 2013, 09:09 AM
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Having gone through about 30 of these things, I notice there is what looks like revision numbers on the label. This is an alpha numeric to the right of the model number.

I've had them from OC 02 to OF 04.

Anybody have a clue?
Old Feb 08, 2013, 09:20 AM
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Quote:
Originally Posted by SCOREMAN View Post
Having gone through about 30 of these things, I notice there is what looks like revision numbers on the label. This is an alpha numeric to the right of the model number.

I've had them from OC 02 to OF 04.

Anybody have a clue?
My Guess is manufacturing date:

12th week of 2002 = 0C 02
16th week of 2004 = 0F 04

Ernie
Old Feb 08, 2013, 09:27 AM
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You could be right. I thought about that too, but there have only been about 4 different codes I've seen. I've bought these from several different sources. Leads me to think the numbers would be "all over the map" if they were mfg. dates.

I will say, the higher the number, the less used they are in appearance. Could be other factors that make that true though.
Old Feb 08, 2013, 07:39 PM
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Sweet setup, still4given. Can I ask how you like the Champion generator? I've heard good things about them. And the price is more manageable than the Honda EU2000i, for instance.
Old Feb 08, 2013, 11:00 PM
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I like the Champion a lot. I don't have Honda to compare it to but it runs well, is fairly quiet and they can be stacked and run together to get 4000W if you need.
Old Feb 21, 2013, 06:46 AM
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hi , thanks everybody for what i've learnt here ,
here is my set up
i have 8 ps (8xhp dps600pb), i have 24voltized 2 of them , everything seems ok .

i want the six others to create a very strong 282A 12V current ,
i'm not a RC guy , in fact i'm building some 12V mixer , for lightshows (many LEDS and 12V stuff) , and i need a strong and heavy 12V generator .
dps600pb seems to be , by far , the best choice , for me .

# 4 , 6 , 8 and and 10 are shortpined , on each separate psu .
# 11 , on every psu , are pined together , for current share .
# 3 and 9 have also been taken , but there's no 1k pot .

but i've never read that it was possible , for 6 psu ,
maybe it's not .
i have read about 2 of them sharing the current 50/50 .

anybody knows if it is possible for 6 ps ?
even 3 or 4 ?

I have tested it 6 psu in parallel with pin 11 connected ,
it was working , as it always does (when not paralleled and 11 connected ).
i mean the fans are are OK , and i get 12,5 V from the outputs .
general behavior is the same .
but i didn' t test with a heavy load .
i can't , for the moment .

somebody could tell me if i'm not running any risk ?

thanks everybody
matthieu



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