Unregulated LiPo
#1
Unregulated LiPo
hello,
I have KO PROPO 2.4GHZ and Sanwa servos. The KR-408S reciever can apparently handle 7.4v no problems. My worry is can the Sanwa digital servos handle it?
Can I run 7.4v LiPo reciever pack directly into reciever, with no damage to both receiver or servos?
Running a regulator takes up too much room and weight, and the costs are stupid (~$30)
Would like to hear from others running the same/similar setup with no problems???
I have KO PROPO 2.4GHZ and Sanwa servos. The KR-408S reciever can apparently handle 7.4v no problems. My worry is can the Sanwa digital servos handle it?
Can I run 7.4v LiPo reciever pack directly into reciever, with no damage to both receiver or servos?
Running a regulator takes up too much room and weight, and the costs are stupid (~$30)
Would like to hear from others running the same/similar setup with no problems???
#2
Tech Regular
Don't try it. I had burned a Sanwa servo before. I use spektrum receiver and it support 2S lipo. But the Sanwa sure don't...... Sorry can't remember what model it is I think it is a vz.
hello,
I have KO PROPO 2.4GHZ and Sanwa servos. The KR-408S reciever can apparently handle 7.4v no problems. My worry is can the Sanwa digital servos handle it?
Can I run 7.4v LiPo reciever pack directly into reciever, with no damage to both receiver or servos?
Running a regulator takes up too much room and weight, and the costs are stupid (~$30)
Would like to hear from others running the same/similar setup with no problems???
I have KO PROPO 2.4GHZ and Sanwa servos. The KR-408S reciever can apparently handle 7.4v no problems. My worry is can the Sanwa digital servos handle it?
Can I run 7.4v LiPo reciever pack directly into reciever, with no damage to both receiver or servos?
Running a regulator takes up too much room and weight, and the costs are stupid (~$30)
Would like to hear from others running the same/similar setup with no problems???
#3
Futaba HRS receivers also don't work with analog servos.
#4
Tech Elite
iTrader: (1)
Sorry.... maybe your sanwa got burned because sanwa erg-vz is analog servo. When you connect analog servo to spektrum receiver, analog servo's FET will get hot..... so hot until it burned itself. Please check your spektrum receiver manual regarding using analog servos.
Futaba HRS receivers also don't work with analog servos.
Futaba HRS receivers also don't work with analog servos.
Mhhhh are you sure ?, lol !!!
I used 2 x 985mg's from Hitec (analog servos) for almost a full year on unregulated lipos and spektrum no problems at all in 1/8th offroad buggy.
cya
#5
Tech Addict
I have used unregulated Lipo for a long time with Spektrum brand receivers. I have used this setup with digital and analog servos without any problems. The Futaba HRS can be used with analog servos but you have to regulate it so that the trasfer rate wont affect the servo.
#7
hello,
I have KO PROPO 2.4GHZ and Sanwa servos. The KR-408S reciever can apparently handle 7.4v no problems. My worry is can the Sanwa digital servos handle it?
Can I run 7.4v LiPo reciever pack directly into reciever, with no damage to both receiver or servos?
Running a regulator takes up too much room and weight, and the costs are stupid (~$30)
Would like to hear from others running the same/similar setup with no problems???
I have KO PROPO 2.4GHZ and Sanwa servos. The KR-408S reciever can apparently handle 7.4v no problems. My worry is can the Sanwa digital servos handle it?
Can I run 7.4v LiPo reciever pack directly into reciever, with no damage to both receiver or servos?
Running a regulator takes up too much room and weight, and the costs are stupid (~$30)
Would like to hear from others running the same/similar setup with no problems???
http://www.rc-toro.com/product_info....oducts_id/1666
#9
I have ERG-VZ, ..... once I connected it to Futaba HRS receiver, and the servo's heatsink become overheating in just 3 minutes ..... I notice something wrong in there but I don't know what. I keep doing it for another 5 minutes more.... luckily I decided not to gamble with it. I plug out the battery and change the receiver back to Futaba PCM 1024 R113ip. I right away notice the servo is not hot at all ( not even warm ) after changing receiver.
[ at that time, I though ERG-VZ is digital servo ].
In my buggy, once I try unregulated lipo 7.4V for simplicity reason. The receiver is Futaba R113ip 1024 PCM, and the servos are Hitec 5995TG. It's working, the servo turn the wheels very quick. I said to my self.... amazing ! I keep playing with it for another 5 minutes more to see if the heatsink become hot or too hot. Amazingly, it just normal warm, no overheating. ...... At the end of testing, after careful considerations, I decided not to use it like that .... I think it is stupid idea because the servo is already cost me $200, and I could buy LiFe battery for $40. You got what I mean, right
#11
The Rx cannot handle 7.4V. Hence you need a regulator for this. If you can try to replace with LiFe running on 6V. This might solve your prob without attaching more electronics on your car.
#12
1. Spektrum rx will handle input coltage up to 9.6v no problem. (The KO up to 7.4v)
2. Spektrum rx will handle both digital and analogue servos no problem.
3. You can run the servos unregulated and they will work fine (maybe even slighty quicker) but you run the risk of damaging them as they are not designed to be run at these higher voltages.
4. LiFe is a good solution that is becoming more widely available. A 2 cell pack is perfect at 6.6v if you can find the right size.
5. Companies (JR, Hitec) are starting to release HV (high voltage) servos for this application if you are buying new servos look out for them.
6. The simple answer if you are intent on using LiPo is use a regulator. They are very cheap and very light and you will maximise your servo life.
2. Spektrum rx will handle both digital and analogue servos no problem.
3. You can run the servos unregulated and they will work fine (maybe even slighty quicker) but you run the risk of damaging them as they are not designed to be run at these higher voltages.
4. LiFe is a good solution that is becoming more widely available. A 2 cell pack is perfect at 6.6v if you can find the right size.
5. Companies (JR, Hitec) are starting to release HV (high voltage) servos for this application if you are buying new servos look out for them.
6. The simple answer if you are intent on using LiPo is use a regulator. They are very cheap and very light and you will maximise your servo life.
#13
I am using Spekrum SR3500 previously. Although the supported voltage is 3.2 - 9V. I still stick to NiMH at 6V. Reason is when u input 6V to the RX. The output is the same as input. Higher volts will kill the servos. Else you may consider a regular to be safe.. But I seen ppl got both servo's toasted when their regulator mulfunctions..
To date no servo manufacturer produces servo to operate at 7.4V for this case.
To date no servo manufacturer produces servo to operate at 7.4V for this case.
#14
Wrong!
Here is just one example...
http://www.hitecrcd.com/servos/show?name=HS-7940TH
or here is a cheap regulator that I have used that works well...
http://www.rcmart.com/catalog/rc-vol...3-p-28209.html
Do your research and be careful who you listen to!
Here is just one example...
http://www.hitecrcd.com/servos/show?name=HS-7940TH
or here is a cheap regulator that I have used that works well...
http://www.rcmart.com/catalog/rc-vol...3-p-28209.html
Do your research and be careful who you listen to!
Last edited by getpip; 12-26-2009 at 07:08 AM.
#15
Tech Master
iTrader: (2)
This year I have been running LiPo in my car combined with a Xceed regulator.
Didn't had any electronic problems whatsoever, actually this has been the first year that all of the electronics have been working flawlessly.
The Xceed regulator is extremely small and lightweight, I taped mine to the side of the receiver.
Used a 700Mah Lipo, which is just enough for 40 minutes of driving.
Didn't had any electronic problems whatsoever, actually this has been the first year that all of the electronics have been working flawlessly.
The Xceed regulator is extremely small and lightweight, I taped mine to the side of the receiver.
Used a 700Mah Lipo, which is just enough for 40 minutes of driving.