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› Hyperion 0606i AC/DC discharge issue?
06-06-2010 02:24 AM  7 years agoPost 1
CRCR

Senior Heliman

Aus

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I am wanting to discharge my 5s Lipos. I set it up to discharge at the highest rate the charger will allow which is 1.00A but when I push start it says its only discharging at 0.25A.
What is the issue here, why won't it dischage at the rate I set? does it need a firmware upgrade?

Last night I started dischaging at the 0.25A and it took 6.5hrs to discharge one 5000mah pack from 21v down to 19.3 volts.

Can someone please shed some light on this problem?

Thanks

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06-06-2010 02:44 AM  7 years agoPost 2
TJinGuy

rrProfessor

Socorro, NM - USA

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Did you see the last bit on the line in the specs where it states

"0.1A - 1.0A Selectable Discharge Current (5W max)"

Well they weren't kidding. So you've got 5W to play with and here is how it breaks down ...

Watts = Volts * Amps
or
Amps = Watts / Volts
so this is what you have for 2s, 3s, 4s and 5s lipos
Amps = 5W / 8.4V = .60A
Amps = 5W / 12.6V = .40A
Amps = 5W / 16.8 = .30A
Amps = 5W / 21V = .24A

- Chris

Team New Mexico
TJinTech

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06-06-2010 04:00 AM  7 years agoPost 3
CRCR

Senior Heliman

Aus

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Thanks Chris,

I missed the 5W max bit. Well I guess I'll just have to put up with the 6.5hrs discharge I wonder why the discharge rate is so low and it has a 50W charge rate.

If I ever have to discharge using a charger again I think I'll have to look at a different model. This is painful waiting when I have 6 packs to do.

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06-06-2010 04:17 AM  7 years agoPost 4
TJinGuy

rrProfessor

Socorro, NM - USA

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Really there are no chargers with high discharge rates. This is because the only way to discharge is to burn off energy as heat. Well as you can guess more discharging capabilities = more heat. Can you imagine if you had a 100W light bulb inside your charger? The charger would get so hot so quickly that it would kill it and probably melt your counter top. As such you will have to look hard to find one that has big enough discharging capabilities to discharge a large pack in any reasonable amount of time.

So this brings me to the real question ... why would you ever want to discharge a lipo with a charger?

The best discharger is your heli. If that happens to be crashed and you need to discharge your packs anyways, then get some other resistive load to do the job. Light bulbs work great. A 12V head light for example is usually rated at 55W. That will discharge a 3s lipo at 55W/12.6V = 4.4A. If you want to discharge larger cell count packs, then you need to put 2 of the same 12V bulbs in series. That will do 4s-6s packs.

Of course you could use dozens of other items to discharge also. I will sometimes use my thermoelectric travel cooler to discharge 3s packs. That draws about 4A constant.

One last thing to think about. If you use a resistive load like a light bulbs to discharge packs, then be very careful you don't overdischarge your packs. If you had an iCharger then you could use it control the discharge through the bulbs an it would stop the discharge at the voltage you choose. Another option is to use a CellLog to alarm when the discharge voltage is reached.

- Chris

Team New Mexico
TJinTech

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06-06-2010 05:07 AM  7 years agoPost 5
Ace Dude

rrProfessor

USA

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The Hyperion 720i NET3 has 80W of discharge power and the upcoming FMA Powerlab 8 has 100W discharge power.

  

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06-06-2010 06:09 AM  7 years agoPost 6
TJinGuy

rrProfessor

Socorro, NM - USA

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Yup there are some chargers with higher discharge ratings but have you actually tried it before? These chargers get HOT when they dissipate 80-100W of heat. Don't forget to add the actually available iCharger 1000W 3010B to your list, as it also has a 80W of internal discharging capabilities.

- Chris

Team New Mexico
TJinTech

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06-06-2010 01:39 PM  7 years agoPost 7
Ace Dude

rrProfessor

USA

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I have used the 80W discharge capability of my Hyperion 720i NET3. It's a good design utilizing dual temperature controlled fans so it doesn't get very hot.

The Powerlab 8 also appears to be a very good design using a massive heat sink.

I forgot to mention that Schulze also has a charger with 100W discharge capability as well.

Thus, depending on what you consider high discharge rates, there are several chargers available with high discharge rates and some of these (e.g., Hyperion and Schulze) have been available on the market for a while now.

  

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06-07-2010 03:18 AM  7 years agoPost 8
CRCR

Senior Heliman

Aus

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Thanks guys,

No my heli is not crashed, the weather is really bad so can't fly to discharge them. They have now been charged for 4 days so I need some other way to discharge.
I have just got some 12v car lamps to wire up in series to do the discharging.

What is the max length of time you would say a lipo can be fully charged for?

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06-07-2010 03:50 AM  7 years agoPost 9
TJinGuy

rrProfessor

Socorro, NM - USA

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What is the max length of time you would say a lipo can be fully charged for?
There is no real consensus on that one. Some believe it doesn't matter how you store them or for how long. Others are SUPER paranoid and storage charge then after every discharge only to charge them again right before they fly. I am sure the real answer is in the middle somewhere. I personally try not to leave mine charged for more than a week, just cause it bugs me. Mostly because it means I hadn't flown in a week but it also just grates on me to have my packs charged for long periods of time. But that is me and you have to make up your own mind.

- Chris

Team New Mexico
TJinTech

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