Duo3 settings

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Old 08-13-2010, 07:40 PM
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Originally Posted by Leodis View Post
-The day before a race, I charge the Lipo at 2C with 95% cut-off. 35 minutes.

-In between heats, I charge at 2C and pull the lipo off the charger after cv mode kicks in. 12 minutes.

-After the race day, I store it at 65% capacity. 5 minutes.
hi.. what it the time set (35, 12 or 5 mins) has elapsed but your charging/discharging target is not yet reached?
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Old 08-13-2010, 07:55 PM
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Originally Posted by J-Force View Post
hi.. what it the time set (35, 12 or 5 mins) has elapsed but your charging/discharging target is not yet reached?
Those are just the average times. Sometimes the functions take a little more time. Sometimes they take a little less time...
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Old 08-13-2010, 08:00 PM
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Originally Posted by J-Force View Post
what relation/effect has the charger's wattage (180w / port) to the charging?
more watts = quicker charge

also, if the 5400mah 4s 50c pack is being charged at 5.5a but at the rate of 2c instead of 1c, what would be the effect?
If you're charging at the rate of 2c, you would be charging the lipo at 10.8 amps, not 5.5 amps.
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Old 08-13-2010, 08:26 PM
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Originally Posted by J-Force View Post
a few more queries...

what relation/effect has the charger's wattage (180w / port) to the charging?

i'm using Muchmore PS 24A, would you think that is enough for the duo3? i used to charge 2 4s packs at the same time..

also, if the 5400mah 4s 50c pack is being charged at 5.5a but at the rate of 2c instead of 1c, what would be the effect?

thanks so much guys
The 180 Watt power relates to a combination of how fast you could potentially charge the battery, and how large of a battery. Depends on the settings you use, if you set it at 5 Amps for example the extra power wouldn’t be used or reduce time. But it does allow you to use a higher charge rate if your batteries allow and you have enough supply to it.

Amps x Volts = Watts

Some examples for your case:

1C: 5.4 Amps x 16.8 Volts = 90.72 Watts (16.8V being the full charge for a 4S)
2C: 10.8 Amps x 16.8 Volts = 181.44 Watts (which a Duo can’t quite do with one port, but close)

Assuming the Muchmore supply is the typical 13.8 Volts, it’s capable of about 330 Watts. Need to reduce this to account for charger efficiency and allow some headroom, I’d recommend figuring on about 250 Watts of charge power at most for reliable operation, proportionally lower if it’s really a 12V supply. This needs to be split for the 2 ports of the Duo. So you could charge two 4S at a little over 7 Amps each with this supply.

250 Watts / 2 ports = 125 Watts per port
125 Watts / 16.8 Volts = ~7.4 amps

Perhaps a little over 6 Amps per if it's a 12 Volt supply.
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Old 08-13-2010, 09:32 PM
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thanks for these great learnings!..

going to the duo3, if the settings are: 5.4A at 2C (default), will it be charging at 2C as set or at 1C? i understand that the 1C for a 5400mah pack is 5.4A.
In short, if you want 2C charging, just set it at 2C although the amp is set at its 1C equivalent?
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Old 08-14-2010, 09:24 AM
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Originally Posted by J-Force View Post
thanks for these great learnings!..

going to the duo3, if the settings are: 5.4A at 2C (default), will it be charging at 2C as set or at 1C? i understand that the 1C for a 5400mah pack is 5.4A.
In short, if you want 2C charging, just set it at 2C although the amp is set at its 1C equivalent?

If you set charger at 2C, charger will try and charge a pair of 5400mah lipos at 10.8amps, but due to your power supply's power output, charger will limit charge current and you'll see less than 10.8amps, but more than 5.4amps. If you set charger at 1C, the charge will charge at 5.4amps since your power supply can supply the required wattage for that charge rate to both ports.
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Old 08-14-2010, 12:05 PM
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Originally Posted by Duster_360 View Post
It takes approx 1hr at 1C to charge. At 2C it cuts the CC part of the charge in half since the current has been doubled. But the CV part now starts from a higher current since it was doubled so 2C will not cut the time in half. Expect something like a 40% reduction in time, so 35, 36min. It depends on how far down the lipo was run too, so its hard to quote a precise time.

Duo3 - I didn't notice until it was pointed out, but Hyperion's manual tells you that to run at full power (180watts per port), charger requires 14.5+v DC input. That means most 13.8v RC oriented PS will not run Duo3 at full power. Hyperion doesn't explain what this means as far as charger power reduction if you supply is not 14.5+v.

Otherwise you need PS with more than about 430watts. It should be a 15v output power supply if you want to run Duo3 at full power. Check the 1st page of the unified manual that cover the Duo3, the table at the bottom of the page -

http://media.hyperion.hk/dn/eos/EOS-...2-MAN-EN46.pdf

AMain's Pro 40 power supply looks like a good choice, but its a 13.8v supply.
Thanks so much Duster.
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Old 08-14-2010, 01:46 PM
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I did a bunch of digging last night - I was curious about the 14.5+v required for the Duo3 to deliver full power and how much diff that really makes. I finally found where someone actually tested it both ways on RC Groups.

Full power is 180watts per port and requires a power supply with higher than 14.5v input. The testing with a 18v input source did verify that the Duo3 delivered 180watts per port. With a 13.8v power supply, they tested the power output at 160watts per port, or a 20watt power decrease due to the lower voltage input source. Thats a little over an 11% decrease in output power.

Along the way to finding this info, I saw several who had tested the Duo3 for efficiency using wattmeters and testing was indicating either 81 or 82% efficiency.
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Old 08-14-2010, 03:03 PM
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Originally Posted by Duster_360 View Post
If you set charger at 2C, charger will try and charge a pair of 5400mah lipos at 10.8amps,
Not quite, at least in terms of the C setting on the charger…

Originally Posted by J-Force View Post
thanks for these great learnings!..

going to the duo3, if the settings are: 5.4A at 2C (default), will it be charging at 2C as set or at 1C? i understand that the 1C for a 5400mah pack is 5.4A.
In short, if you want 2C charging, just set it at 2C although the amp is set at its 1C equivalent?
The C setting on the Duo does not directly impact the charge rate. While there is a C setting, it is just a safety setting to help prevent you from accidentally setting the Amp rate too high.

5.4A with 2C will charge at 5.4A. Note with a 2C setting you cannot turn the Amps above 10.8, well assuming the capacity is set at 5400mAh. Set to 3C and then the Amps can be turned past 10.8A. Set to 1C and you are limited to 5.4A, etc.
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