Should I discharge the Battery?
by hivemind
Fri Sep 29, 2006 9:06 pm
Well a default setup (6v) each servo draws 1.2A at max current (.2A for sitting), so if you have all 18 (default+matts grippers) servos loaded then you are drawing 21.6A total. But... realistically you will only have what? 6-8 at max current and the rest might be moving but without much resistance, do some math...
8 loaded is 9.6A and then 10 not loaded is 2A, so you get 11.6A total if you have 8 stalled... If i were you I would look for a regulator with a 15A rating or higher. You may not find one, but thats what you should be looking for.
Hope that helps
8 loaded is 9.6A and then 10 not loaded is 2A, so you get 11.6A total if you have 8 stalled... If i were you I would look for a regulator with a 15A rating or higher. You may not find one, but thats what you should be looking for.
Hope that helps
by bauermech
Sat Sep 30, 2006 3:44 pm
This one is one I was considering:
http://www.maxxprod.com/mpi/mpi-21.html
...15 Amp continuous, 30 Amp peak, adjustable output....
http://www.maxxprod.com/mpi/mpi-21.html
...15 Amp continuous, 30 Amp peak, adjustable output....
by Zembot
Sun Oct 01, 2006 6:14 pm
I could use some clarification. How would it react with a 2-cell 7.4 LiPo? If I understand correctly, when voltage drops below 6v it will negate one of the cells? So in effect, I’d have a voltage cutoff because the voltage would have dropped by 50 percent (with a 2-cell 7.4v LiPo)? Which is fine with me. I’m looking for something that will save my 7.4v Lipos from discharging below 6v in the RN. Is the MPI ACC134 6-Volt Regulator the answer?bauermech wrote:This one is one I was considering:
http://www.maxxprod.com/mpi/mpi-21.html
...15 Amp continuous, 30 Amp peak, adjustable output....
by bauermech
Sun Oct 01, 2006 7:04 pm
Is the MPI ACC134 6-Volt Regulator the answer?
I was actually refering to the ACC234 for Li-Po Regulator, but No, you're right. I don't think either of 'em is what your looking for. You'll want an actual voltage cut-off circuit. I guess we did get a little side-tracked talking about regulators huh?
I do agree w/ Hivemind. I wouldn't go w/ a 5.5v cutoff either. I start charging typically before 3.3v/cell.
by Zembot
Wed Oct 04, 2006 1:52 am
I’ve googled but can’t find a cut-off for a 7.4v LiPo. At least nothing applicable for the RN-1. Certainly someone here must be using a cut-off for LiPos? Maybe I’m just using the wrong keywords in my searches.
I’ve read about the International Rectifier iP1203 Buck converter in another thread. Sounds great however, I’d like something more simple and lower cost.
Where can I order a small rinky dink voltage cut-off to solder between my LiPo and RN-1? Does such a thing exist?
I’ve read about the International Rectifier iP1203 Buck converter in another thread. Sounds great however, I’d like something more simple and lower cost.
Where can I order a small rinky dink voltage cut-off to solder between my LiPo and RN-1? Does such a thing exist?
by Robo1
Wed Oct 04, 2006 9:39 am
I've been playing with li-po's for my khr-2.
I did design a circuit to turn the robot off when the battry got low. the only problem was that I couldn't get the components to be very small. if you look at the rating you need them to be 5-15A that means that they will be quick big. So I just used the standard low warning led that you can just get from a rc shop. I mounted it in his head and turn the bot off then it comes on. not the best solution but simple and small.
bren
I did design a circuit to turn the robot off when the battry got low. the only problem was that I couldn't get the components to be very small. if you look at the rating you need them to be 5-15A that means that they will be quick big. So I just used the standard low warning led that you can just get from a rc shop. I mounted it in his head and turn the bot off then it comes on. not the best solution but simple and small.
bren