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10-10-2013 03:59 PM  4 years agoPost 1
michael88997

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Lewisville,Tx

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ok tried doing a search but didn't really clear anything up..

my question is I know my wall outlet can do 15 amps at 110volts.. how do I see what that would convert to when charging lipos at 12v?

my bigger helis I never had more than 2 packs so I was always around 10 amps and I have a 450 now so never been close to pushing the limit

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10-10-2013 04:33 PM  4 years agoPost 2
michael88997

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Lewisville,Tx

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ok so looking at the internet I found some info
so I have a hyperion 1420I. max of 28volts 20amps and 550watts

so taking 550/28 is about 20 amps

so do I take 550/110 to get 5 amps at my breaker? that doesn't make since to me

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10-10-2013 05:02 PM  4 years agoPost 3
rocket_33

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Mount Pleasant, Michigan USA

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At 110 volts and 15 amps, that is equivalent to 1650 watts max output.

If your source is 12 volts, then that means your 12 volt source would need to put out 137.5 amps to equal the max your outlet can put out.

Part of the reason the large output charges use external power supplies is because an all in one would be quite large to house the power supply (with needed heat sync) and charger circuitry

So FYI on my Hyperion that has a max output of 1000 watts, I am using a 27 VDC power supply that is appx 38 amp output.

It is all about Watts, so yes, your charger max output is 550 watts which means about 19 amps is the most it can put out. What does that mean? with your typical 6 cell battery, it can output a max of 22 amps, which means a 6S 5000C max charge rate is 4 C assuming no losses (so realistically 3C)

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10-10-2013 05:15 PM  4 years agoPost 4
michael88997

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Lewisville,Tx

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ok thanks for the info.. that makes more since, so I can pull 1650 watts with no problem...

so basically I can charge 4 x 4500 6s packs at 1c no problem..

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10-10-2013 05:22 PM  4 years agoPost 5
qraptor

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Illinois

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Yep,
At the wall/house circuit end, you are fine, since you are below the limit on what it can supply. You won't trip the circuit breaker.

But as rocket said, you can get more power to a charger when you supply it at 24 to 27 V (roughly double that at 12 V). So, when you get ready for your next upgrade (and aren't we all always), a 24 V supply for a 24 V input charger would be the way to go.

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10-10-2013 05:30 PM  4 years agoPost 6
michael88997

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Lewisville,Tx

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yeah I feel like upgrading as soon as I upgrade lol

yeah I am most likely going to get a jr e6 and might buy 4-6 4500 packs for it, my charger can do 25v but would def need more watts to parallel charge them... now I need to decide if I want 4 packs and a generator, or 6 packs and bigger charger/psu, or both haha.. not to mention my 6 packs for my 450L

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10-10-2013 06:44 PM  4 years agoPost 7
Gregor99

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Western Wa

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As a rule of thumb, assuming supplies with APFC and enough charger performance, the wattage output to the packs is roughly 75% of the VA (volt amps), available at the AC source.

So figure for 120v/15a is 1800 VA, which works out to 1350 watts to the packs. For 6s packs that would be 53.7 amps to the packs (typically split across two chargers).

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10-11-2013 04:07 PM  4 years agoPost 8
michael88997

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Lewisville,Tx

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kool thanks for the info... I am probably going to get the skyrc 30amp psu and use it with my hyperion, if I end up needing more than 20 amps I can get another hyperion and psu.. that is cheaper than getting one big psu and one big charger

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10-31-2013 05:15 PM  4 years agoPost 9
michael88997

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Lewisville,Tx

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ok I didn't want to open a new thread but I had some random questions b/c ive never used 24v psu before.. I just purchased 2 HP DPS-1200FB units to upgrade my psu

I don't need more than 20 amps currently to charge, so is there a point to make them into 24v or just use one for now and have a spare?

also if they are made into a 24v unit do they need to be powered with the same plug or if you plug in one at a time do they work?

also I do plan to get a jr e6 soon and would have 4 4500 packs.. if I were to charge at 2 or 3c with a para board what is normally their max amps? I saw the thor ec5 one and I would assume it would be around 60

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10-31-2013 05:52 PM  4 years agoPost 10
Gregor99

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Western Wa

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Regarding 24v, it depends on the current limits of the charger. Remember that if you are charging a 6s pack at 20 amps it will be drawing a little over 45 amps from a 12v supply. If the supply has an input current limit below that, you won't be able to hit the full 20 amps of output.

Also pulling 45 amps will cause a fair amount of warming on the input side. Bumping up to 24v will cut the input current in half.

Each supply will have its own AC input. Both units need to be powered.

The max charge rate is specified by the pack vendor. 5c is common. 5c on a 4500 pack would be 22.5 amps. Typically you'll have two packs per "flight pack". I would charge the two packs in parallel and run them in series. With a charger having a 20 amp max current that would be roughly 2.2c per pack or around 20-25 minutes. It could be less if you lower your TCS to 95% or 90%.

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10-31-2013 06:06 PM  4 years agoPost 11
michael88997

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Lewisville,Tx

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thanks for the info.. those 2 psu's I bought can do 75amps at 12v so they could handle it, I know it would be more efficient but didn't know if it would be by half or not, but makes since that that would..

as far as the plugging in I know they both would had to be plugged in but do you have to have one of the y plugs or can you plug one unit in the other other and have 2 different wall plugs

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11-01-2013 04:16 AM  4 years agoPost 12
Gregor99

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Western Wa

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The issue in your case is not the supplies. Its the charger's input limit. Hyperion does not publish this spec so I cannot tell if will be an issue for you. But its likely to be a problem.

Both supplies can use different power cords. You can plug them in the same wall sockets or different wall sockets. If the wall sockets are not wired the same, you may run into issues running them at the same time.

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11-01-2013 02:44 PM  4 years agoPost 13
michael88997

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Lewisville,Tx

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my charger can take 25v so thats not a problem there... it can only do 550 watts so if I put them together I wouldn't even be close to pushing the supplies

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11-01-2013 06:15 PM  4 years agoPost 14
Gregor99

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Western Wa

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Here's a little more detail. On the input side, the charger will have both a maximum voltage rating as well as a maximum current rating. These ratings are very important when attempting to determine the maximum output. Hyperion provides the maximum voltage but does not give the maximum current. I did find a note I the manual that indicates that to achieve 550 watts 24v is required.

http://media.hyperion.hk/dn/eos/EOS...42-MAN-EN46.pdf

Based on the data in the manual above, I did a rough calculation to find the maximum input current limit is about 22.9 amps. Its more likely that actually 25 amps.

Here's how that input current limit plays out with 12v. First multiply the input voltage times the current limit for the total input wattage. I'm using 25 amps for the calculation. The result is 300 watts.

Next remove 10% to account for the charger's efficiency losses for a total wattage available to the packs of 270 watts.

Finally divide the wattage by the pack voltage to determine available charge current. Using a peak pack voltage of 4.2 per cell a 6s pack is going to be 25.2v. That gives us 10.7 amps. Using a discharged pack of 3.7v per cell that gives us a pack voltage of 22.2v or 12.2 amps. The charge cycle will start just above 12 amps and end at just under 11 amps.

Of course of the actual input current limit is lower the resulting charge current will be lower. Likewise, if the actual input current is higher then the resulting charge current will be higher.

Give it a test run on your setup and let us know what current the charger maxes out at on 12v. I suspect that you will find 24v will be required to hit the higher charge rates.

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11-01-2013 06:56 PM  4 years agoPost 15
michael88997

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Lewisville,Tx

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awesome thanks for the info.. just wanted to make sure if you plug one in then plug the other it wouldn't short anything out.. back in the day before para boards I tried to make one and ended up destroying a pack lol..

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11-01-2013 07:27 PM  4 years agoPost 16
Gregor99

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Western Wa

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If you turn the power supplies on or off separately, be sure you are NOT charging at the time. Its better to just run them into a power strip with switch so both are turned on or off at the same time.

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11-01-2013 07:39 PM  4 years agoPost 17
michael88997

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Lewisville,Tx

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yeah I am going to go to radioshack to pick up the resitors so may get a strip there or try and find one of the y power cables

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