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HomeAircraftHelicopterHelicopter Main Discussion › charger input voltage vs max output?
03-17-2015 05:43 AM  3 years agoPost 21
AWittleWabbit

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O.C., CA

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The charger folks don't make it easy sometimes.
To the op, on top of what fenderstrat said, I'd like to add something. Remember when putting cells or whole identical batteries in parallel, the voltage remains the same and the capacities are added. Like pistolpete said(I think), if you know what current your charger maxes out at on 6s, you can figure out the charge rate.

Mckrakin, I think your charger is limiting your charge rate too. My old TP ac/dc charger wouldn't give me advertised current till I used a power supply. Can your charger take 24v?

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03-17-2015 10:52 AM  3 years agoPost 22
McKrackin

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Lucasville,Ohio

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No. My 200W charger can only take an 18V max input.
It charges at up to 10 amps on 18V.
When hooked to my 12V 350W power supply it maxes out at 7.5 amps.
It only reaches 7.5 amps on smaller packs too. It hits 10 amps on 2650mA 3S packs but if I charge a 5000mA 6S pack,it tops out at around 4.5-5 amps.

It will hit and maintain 10 amps if I use my 18V power supply though.
If your charger says it will charge a max of XX amps at 18V,it will be considerably less on 12V.

Just like my big 1000W charger.
It will charge at 40 amps with a 1000W 30V power supply.
My new power supply is 1080W but is limited to 18V output and my charger will only do 26 amps with the 18V input.
When it was on my 24V power supply,it hit 40 amps. Sometimes 39.5 amps.
It really needs the full 30V to put out 40 amps comfortably.

I have decided on a 1200W 30V power supply for this charger.

To get the max output of your charger,you really need to provide it with it's max input.

I literally never use the word literally right.

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03-17-2015 11:04 AM  3 years agoPost 23
McKrackin

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Lucasville,Ohio

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And like I said...your equipment may behave differently.
Just relaying exactly what MY chargers do with MY power supplies.

I literally never use the word literally right.

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03-17-2015 11:11 AM  3 years agoPost 24
emederos

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Miami, Fl Dade

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I had an 80w charger on 6s 5000 it can only put out 3.4a....it maxes out due to wattage

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03-17-2015 12:46 PM  3 years agoPost 25
McKrackin

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Lucasville,Ohio

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Yes but my charger is 200W.
It maxes out at 10 amps on 18V and 7 amps or less on 12V.

I had to limit it to 3 amps on 12V on the 5000mA packs because it would over heat and shut down.
It stays cooler on 18V as well.

And as always....these are my results with my equipment. Yours may be different. Better or worse.

I literally never use the word literally right.

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03-17-2015 12:52 PM  3 years agoPost 26
emederos

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Miami, Fl Dade

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For a 6s pack minimum is at least 300w to have extra room for power consumption of the charger. At 1C the 6s 5000 pack will draw 126w so at about 1.5 C it's maxing out the 200w and will fun full efficiency get warm

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03-17-2015 01:08 PM  3 years agoPost 27
McKrackin

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Lucasville,Ohio

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Thanks. That is helpful

I literally never use the word literally right.

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03-17-2015 08:37 PM  3 years agoPost 28
fenderstrat

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Aston,Pa

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You guys understand the mah of the battery is not affecting your max charging rate,the number of cells and max output of the charger detemine this,correct?just so we are all on the same page

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03-18-2015 12:31 AM  3 years agoPost 29
AWittleWabbit

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O.C., CA

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Re Mckrakin, gotcha I was curious if maybe your charger could take more.

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03-18-2015 01:26 AM  3 years agoPost 30
emederos

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Miami, Fl Dade

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ok so i just put my packs 6s 5000mah at 3c 15 amps on my 12v power supply and it was pushing the 15a with no problem. also i had the other channel pumping 10a on the same battery and it did fine. i was worried because the manual said at 65 it can put out max 16amps so i figured that at 12v input i would not get that power but i was wrong. I just bought another power supply for no reason when this 12v does just fine....BUMMER...the other PSU can put out 15.5v max so I'm still thinking this will be better anyway???? or am i wrong?

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03-18-2015 01:48 AM  3 years agoPost 31
emederos

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Miami, Fl Dade

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One thing i did notice was at a lower charger rate (ch 1) i set at 2c 10amps and it was only puting in 8.9 constant amps as opposed to the higher charge rate 15amps (ch 2) which was right around 14.8 and 15a. Also i did notice the lower charge rate topped off the packs better than the higher charge rate. After resting 3 minutes the total voltage on the 10a charge was almost spot on 25.19 as opossed to the 3c charge rate that was 25.14. 

15a= 4.18,4.19,4.21,4.19,4.17, 4.19
10a=4.19, 4.20,4.20.4.20,4.20,4.20

I guess lower charge rates are more accurate

At 1C i would get 4.20 across the board perfect charge

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03-18-2015 02:23 AM  3 years agoPost 32
AWittleWabbit

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O.C., CA

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Someone correct me if I'm wrong but durning balancing, most if not all chargers discharge the high cells through resistors till the low cell(s) can catch up. So at high rates, the charger has trouble discharging fast enough to keep them in balance. Some probably turn down the current at times so they can balance (not saying that's your case). I have one pack with a duff cell, I charge it at a lower rate just so it stays mostly balanced. If it gets any worse, it's going to the bin.

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03-18-2015 03:35 AM  3 years agoPost 33
EEngineer

rrProfessor

TX

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chargers discharge the high cells through resistors till the low cell(s) can catch up.
Correct.
So at high rates, the charger has trouble discharging fast enough to keep them in balance
Not so sure about that.
When it was on my 24V power supply,it hit 40 amps. Sometimes 39.5 amps.
It really needs the full 30V to put out 40 amps comfortably.
Bingo....

One wants to supply the charger with max voltage at more current than one's charger can use....and the charger can then "charge" to it's max capabilities.

Chargers have enough "smarts" these days so they don't destroy themselves...or your batts...

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03-18-2015 04:03 AM  3 years agoPost 34
emederos

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Miami, Fl Dade

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I can't explain why it was able in my case it put out 15 amps On a 3c charge and only 8.9 on a 2c charge?

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03-18-2015 04:36 AM  3 years agoPost 35
EEngineer

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TX

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Using the same PS?

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03-18-2015 04:37 AM  3 years agoPost 36
EEngineer

rrProfessor

TX

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A bad cell?

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03-18-2015 01:44 PM  3 years agoPost 37
emederos

rrApprentice

Miami, Fl Dade

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Betteries are almost new and same Power supply. I charge 1 pack at 10amps it only puts out 8.9 roughly and then i charge at 15amps and it puts out 14.8-15a with no problem? Same 12v input

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03-24-2015 04:21 AM  3 years agoPost 38
emederos

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Miami, Fl Dade

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Got a new adjustable power suppl and it won't go up to the rated top voltage of 15.5 v . It's an adjustable voltage PSU now someone explain this? I charge at 5a my charger hangs right about 4.8-4.9 occasionally hitting my set voltage??? The world of electricity and current

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03-24-2015 04:42 AM  3 years agoPost 39
EEngineer

rrProfessor

TX

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Got a new adjustable power suppl and it won't go up to the rated top voltage of 15.5 v . It's an adjustable voltage PSU now someone explain this?
I'll try...

Do you have a DVM?

Assuming you do, with your adj. voltage output PS, measure/adj. its output voltage to its max.(15.5V)....without its being connected to your charger.

It its Vout at 15.5V?...(Y/N)

Assuming "Y", connect it to your charger.

Set the charger for your batts....and start charging the batts.

While charging, using your DVM, measure the voltage output of your PS.....

Is it at 15.5V?...(Y/N)

If "N", then your PS can't deliver the current that your charger/batts require....depending on the charge rate you have set on your charger.

As a result, the PS's Vout "sags".

Or, you might be confusing Volts with Amps...but that's a different subject....

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03-24-2015 11:19 AM  3 years agoPost 40
emederos

rrApprentice

Miami, Fl Dade

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HomeAircraftHelicopterHelicopter Main Discussion › charger input voltage vs max output?
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