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Old Dec 02, 2008, 11:55 AM
ProgressiveRC
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Seattle, WA
Joined Dec 2006
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Very nice chargers Dave and excellent work you do. Looking forward to taking the new 720i for a spin. 20 amps certainly raises the bar, the only other charger I know that claims over 12A is the 20A rated Robbe Power Peak Eternity (14S!/315W), but I'm not sure it's available yet either.

- David
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Old Dec 02, 2008, 12:44 PM
Southern Pride
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Haralson County GA. USA
Joined Oct 2004
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Quote:
I'll now need more than 25A just for fast charging my 6S LiPo's. I brought this up before but it's time someone considers current technology and designs a charger with ample power, this back-and-forth with battery and charger limits each leapfrogging the other is getting costly. Forget the cost for a second, what are the other issues with designing a dual port 1,000 watt floating charger?
Not Dave but my take on these points.

Ample power, what might that be, 1,000,2000,4000 watts? I saw your dual port 1,000 but my guess is that 12 months from now many will want more.

I suggested a 20cell 20 amp. A123 charger was needed long ago. Nominal 3.65per cell X20=73 volts X 20A=1460 watts.

Even with such a charger unless you flew at less than 1400 watts average charging time would exceed flight times. How fast do you really need to be able to charge? Many fly at club fields where 2/3 or more of their time is spent enjoying others fellowship. I fly alone mostly and after 6-10 back to back flights in less than 2 hours I have had enough. When I visit a club field I often fly only 3 or 4 flights in 6-8 hours.

Where is the input watts going to come from? As others have noted anything much over 1,000 watts output is going to required 220 V AC or 24V plus DC input. I already use 24V DC (two 125Ah deep cycles in series) at the field to pwer my DUO and will use the same with the 720i.

A side note here: Dave was the only manufacture to pick up on my 24V DC input suggestion well over a year ago.

The leapfrogging between batteries and chargers is certainly no worse than the same issues with BL Motors, HV ESC and even the ever increasing size of the aircraft which many seem to desire.

I am thrilled with the fact that .40 ish size aircraft are a personal favorite of mine and that they cost less than a decent used car.

I bet Dave would love to forget the cost, design,build and market the ultimate 30 cell ,30A (3600 watt) charger. Question is how will he sell enough of them to even cover development cost much less make a profit.

Charles
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Old Dec 02, 2008, 02:03 PM
HAL... Open the damn doors!
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Miramar, Florida
Joined Jul 2007
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Quote:
Originally Posted by everydayflyer
Not Dave but my take on these points.

Ample power, what might that be, 1,000,2000,4000 watts? I saw your dual port 1,000 but my guess is that 12 months from now many will want more.

I suggested a 20cell 20 amp. A123 charger was needed long ago. Nominal 3.65per cell X20=73 volts X 20A=1460 watts.

Even with such a charger unless you flew at less than 1400 watts average charging time would exceed flight times. How fast do you really need to be able to charge? Many fly at club fields where 2/3 or more of their time is spent enjoying others fellowship. I fly alone mostly and after 6-10 back to back flights in less than 2 hours I have had enough. When I visit a club field I often fly only 3 or 4 flights in 6-8 hours.

Where is the input watts going to come from? As others have noted anything much over 1,000 watts output is going to required 220 V AC or 24V plus DC input. I already use 24V DC (two 125Ah deep cycles in series) at the field to pwer my DUO and will use the same with the 720i.

A side note here: Dave was the only manufacture to pick up on my 24V DC input suggestion well over a year ago.

The leapfrogging between batteries and chargers is certainly no worse than the same issues with BL Motors, HV ESC and even the ever increasing size of the aircraft which many seem to desire.

I am thrilled with the fact that .40 ish size aircraft are a personal favorite of mine and that they cost less than a decent used car.

I bet Dave would love to forget the cost, design,build and market the ultimate 30 cell ,30A (3600 watt) charger. Question is how will he sell enough of them to even cover development cost much less make a profit.

Charles
Noted, all valid points but I believe there is a market for an "uber" charger. Remembr the Orinoco charger that was announced by Aareva? It is now 5 years since that "vaporware" product was announced and pictured on their web site (seems they did build a POC model at least). If that charger had been made (4 ports, 600 floating watts) it would still be the king today, that's 5 years for the same product, unheard of in electronics. Granted the cost was expected to be $800 to $1,100 but with LiPo's costing $300 a pop, I would have purchased one for certain.

There are folks out there that buy $3,500 turbines, $2,000 retracts, $10,000 jet kits (BVM Ultra Bandit), there is a market for folks who know a good product and want the best (that can mean many things, fastest, most powerful, best construction, whatever) available. In the case of batteries, I am changing chargers every 18 months, I find that to be too often given I have the same LiPo's I purchased 4 years ago. All I am saying is I want more power for charging and 2 ports, how much more would it have to cost?

Jack
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Old Dec 02, 2008, 10:40 PM
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Ok I gotta jump in with a question about the DUO #1. Why is it when I charge a lipo at lets say 8 amps the display allways says 8.08 or I charge at 5 amps and it will read 5.04 amps. It doesnt matter I guess but why doesnt at just 8 or 5? Whats with the extra .08 ?
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Old Dec 02, 2008, 11:35 PM
Family,RC Planes & Gym....
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I have my DUO for a couple of months. I normally charge the same pack at the same time. But, today I charged a 3200 3s on ch.1 and 2100 4s on ch. 2 . I've noticed that both channels were charging at the rate of 3.2amp. Is that normal? Thanks
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Old Dec 03, 2008, 12:02 AM
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Quote:
Originally Posted by vq35721
I have my DUO for a couple of months. I normally charge the same pack at the same time. But, today I charged a 3200 3s on ch.1 and 2100 4s on ch. 2 . I've noticed that both channels were charging at the rate of 3.2amp. Is that normal? Thanks
First, that depends on what settings you made. Assuming you did NOT set one of the batts to 3.2A then it is NOT correct. What firmware are you. There was a bug at one point where under certain button-push combos CH1 rates could be applied to CH2 mistake (forget which firmware fixed it, but v1.92 certainly will)

D
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Old Dec 03, 2008, 12:06 AM
Buyin', Tryin' and Flyin'
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DFW, Texas
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NipponDave, I have sent you a couple of PMs...

-Hilgert
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Old Dec 03, 2008, 12:07 AM
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Dave Any idea about why im charging above my input amperage. Like I said 8.08 on a programmed 8. I just installed 1.9 same thing.
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Old Dec 03, 2008, 12:10 AM
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DFW, Texas
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Installed new DUO II firmware - no problems thus far.

Dave, what was "fixed" on the display with the new firmware that would be noticeable?

-Hilgert
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Old Dec 03, 2008, 01:02 AM
Family,RC Planes & Gym....
Santa Ana/92705
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Quote:
Originally Posted by NipponDave
First, that depends on what settings you made. Assuming you did NOT set one of the batts to 3.2A then it is NOT correct. What firmware are you. There was a bug at one point where under certain button-push combos CH1 rates could be applied to CH2 mistake (forget which firmware fixed it, but v1.92 certainly will)

D
I did set one ch. to 3.2. I have the 1.7.
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Old Dec 03, 2008, 02:44 AM
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United States, TX, Houston
Joined Oct 2007
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7s balnce connectors

NipponDave,

I am having custom 7s Lipos built, and I was wondering what 7s balance connector the new 0720NET will support.

Will it support the 8 pin Align connector. Are you going to offer an adapter for this. If not, what connectors do I need to get on these batteries?


Erling
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Old Dec 03, 2008, 02:44 AM
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Quote:
Originally Posted by Dragonfueled
Dave Any idea about why im charging above my input amperage. Like I said 8.08 on a programmed 8. I just installed 1.9 same thing.
Tolerance...

Your difference is 0.0099009900990099009900990099009901 of the rate you set.

Don't worry...

D
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Old Dec 03, 2008, 02:45 AM
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Quote:
Originally Posted by vq35721
I did set one ch. to 3.2. I have the 1.7.
ok, but were BOTH channels set to 3.2?

D
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Old Dec 03, 2008, 02:49 AM
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Quote:
Originally Posted by Captain Norway
NipponDave,

I am having custom 7s Lipos built, and I was wondering what 7s balance connector the new 0720NET will support.

Will it support the 8 pin Align connector. Are you going to offer an adapter for this. If not, what connectors do I need to get on these batteries?


Erling
We will hav option 2S-to-7S adapters for 0720i, with same types (HP, EH, XH, TP/FP) as available currently for 2S-6S.

Will also have the 8-pin HP taps, so you could use our tap on your pack native if you like.
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Old Dec 03, 2008, 02:51 AM
Family,RC Planes & Gym....
Santa Ana/92705
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Quote:
Originally Posted by NipponDave
ok, but were BOTH channels set to 3.2?

D

No sir :-) one ch is set to 2.1 :-(
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