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Ron’s HeliProz South . Century Helicopter . MTA Hobbies

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Radio - JR & Spektrum DSM > How long does a batterypack last on a DX7?
 
 
Reidar Otto
Senior Heliman
Location: Oslo Norway

5 hours 38 minutes 12 seconds 9.8 volts

How I do know when the voltage change even down to the seconds?
I have a videorecorder running recording the readout. Simple as that.

But now I am very bored, so max 30 minutes more, the I´ll go to bed.
This is very similar to watching paint dry!
02-12-2007 Over year old.
HOMEPAGE  
 
 
ESWLFSE
Elite Veteran
Location: Bradenton, FL USA

Wow I wonder how the long the 4500 NiMH in my MC-24 would last then?

Is the DX-7 more efficient than a 9303?
02-12-2007 Over year old.
 
 
Reidar Otto
Senior Heliman
Location: Oslo Norway

5 hours 53 minutes 32 seconds 9.7 volts

Yes the DX7 seems to be more than twice as efficient than the 8310, so I guess it will be the same with the 9303.
And your MC24 will probably last 6 - 7 hours with 4500mAh.

02-12-2007 Over year old.
HOMEPAGE  
 
 
Reidar Otto
Senior Heliman
Location: Oslo Norway

passed 6 hours right now, still 9.7 Volts,
I guess the cows have come home by now?

It is truly amazing that you can fly for ore than 6 hours, at least on a summers day and still have a lot of juice left in the batterypack. But I do think that most of us will charge the TX long before 6 hours?
Still its nice to know that you have so much in reserve.
I will stop at 9.6 Volts........

Tomorrows test in subzero conditions will tell another tale I think.
02-12-2007 Over year old.
HOMEPAGE  
 
 
PaulJC
Elite Veteran
Location: Hertfordshire UK

The 9303 draws 200mah so is roughly the same

The low voltage alarm would be bleeping away now on the 9303 as it goes of at 9.8 IIRC.

Quote 
Wow I wonder how the long the 4500 NiMH in my MC-24 would last then?
4500mah/200mah=22.5hrs so guess on about 20-21 hours.

Quote 
But I do think that most of us will charge the TX long before 6 hours?
I charge when near the low voltage alarm(9X2/9303), normally don't let it get below 10v

Welcome to RR village a tight knit community of geeks & gossips.
02-12-2007 Over year old.
 
 
PaulJC
Elite Veteran
Location: Hertfordshire UK

I stand corrected, i've just checked and low voltage alarm is 9.0v.

Most peopl start thinking there TX will die but fail to realise that the voltage is regulated to 5.0v inside the unit so in theory it'll keep going untill the battery can no longer provide the 200mah required to keep it alive regardless of the voltage

Welcome to RR village a tight knit community of geeks & gossips.
02-12-2007 Over year old.
 
 
Reidar Otto
Senior Heliman
Location: Oslo Norway

6 hours 7 minutes 42 seconds to 9.6 Volts
I am calling off this test now,
thanks, and I´ll see you all tomorrow when we
do the test outdoors in the cold.
Sleep tight, its almost half past 11 in the night here in Oslo Norway.
cheerio!!

02-12-2007 Over year old.
HOMEPAGE  
 
 
PaulJC
Elite Veteran
Location: Hertfordshire UK

lol, the voltage on a nimh pack starts to drop away faster as the voltage gets lower so it may not have lasted much longer anyway

Welcome to RR village a tight knit community of geeks & gossips.
02-12-2007 Over year old.
 
 
MolokaiBoy
Key Veteran
Location: Kailua-Kona,Hawaii USA

careful

be careful read a thread here once where someone accidently left there radio on and it didnt want to power up after charging the battery. not sure how much of this is true but i belive its something to consider, i mean components may heat up after extended periods of time being left on, dont think these were designed for continous operation without turning them off.

just my opinion

Les
You gonna fly that??
02-13-2007 Over year old.
HOMEPAGE  
 
 
Reidar Otto
Senior Heliman
Location: Oslo Norway

Thank you for your concern, but I can report that the radio was not warm at all, not the batterypack and on no place on the plastic box itself could you feel any heat, so I guess its true that it uses a lot less enenergy than our "oldfashioned" radios which get warm.

So I think it is safe to keep it turned on for a long time.
And remember people who fly RC sailplanes keep them in the air for hours, I also know a guy with a camerablimp who keeps his radios on for at least 8 hours during big events.
02-13-2007 Over year old.
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Reidar Otto
Senior Heliman
Location: Oslo Norway

So how much energy was used?

My Schulze 6-330 charger managed to pack 1302 mA back into the DX7,
that is almost 213 mA used per hour. Not a lot.
02-13-2007 Over year old.
HOMEPAGE  
 
 
PaulJC
Elite Veteran
Location: Hertfordshire UK

So my 200mah wasn't far off

Are you going to repeat the test in the cold?

Welcome to RR village a tight knit community of geeks & gossips.
02-13-2007 Over year old.
 
 
Reidar Otto
Senior Heliman
Location: Oslo Norway

Good afternoon Paul!
Yes it has been placed outside in the cold for 4 hours and 40 minutes now and still reads 10,1 Volts. Unfortunately it´s not as cold as usual, only about -5ºC which is 23ºF so it is not the hardest of tests.
But as we all know NiMH does not like cold weather so we will get an indication.

Tune in later for the results from the Norwegian jury.

02-13-2007 Over year old.
HOMEPAGE  
 
 
PaulJC
Elite Veteran
Location: Hertfordshire UK

I don't tend to fly if its less than 5ºC, so the results would be good to know

You had "passing 4 hours 32 minutes, the reading shows 10.1 volts." yesturday in the warm so it doesn't seem to be that effected so far

Welcome to RR village a tight knit community of geeks & gossips.
02-13-2007 Over year old.
 
 
Reidar Otto
Senior Heliman
Location: Oslo Norway

6 hours 2 minutes 36 seconds, still 10.0 volts hmm.....
so much for science, its outside, its minus 5ºC, i.e. 25 degrees colder than yesterdays test inside and the voltage is higher.
It should have been lower, anyone?

02-13-2007 Over year old.
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PaulJC
Elite Veteran
Location: Hertfordshire UK

Mayby newer technology ni-mh's arn't as effected by temperature as everyone thinks

Welcome to RR village a tight knit community of geeks & gossips.
02-13-2007 Over year old.
 
 
g007monroe
Heliman
Location: Raleigh, NC USA

So wait, does this mean that the switching voltage regulator mod (the one from dimension engineering) would be pretty much useless? I've already done the mod to my DX6, so I just figured the DX7 would be the same....
02-13-2007 Over year old.
 
 
PaulJC
Elite Veteran
Location: Hertfordshire UK

I dont see any advantage to a switching regulator mod for a device that only draws 200-250mah

Welcome to RR village a tight knit community of geeks & gossips.
02-13-2007 Over year old.
 
 
Reidar Otto
Senior Heliman
Location: Oslo Norway

We have just passed 7 hours 0 minutes and 52 seconds and its 9.7 Volts
It seems to me that the voltageregulator modification will not be needed?

02-13-2007 Over year old.
HOMEPAGE  
 
 
PaulJC
Elite Veteran
Location: Hertfordshire UK

Exactly And i've got a 2700mah in my 9X2

Welcome to RR village a tight knit community of geeks & gossips.
02-13-2007 Over year old.
 
 
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Radio - JR & Spektrum DSM > How long does a batterypack last on a DX7?
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