
jstarne1
Hello All, I am thinking this may be a custom build but I will poke around for help. I need to drop the 40 volts from the main drive batteries to usable voltage for the Sabertooth 2x12a motor controller and also the EZB itself of course. Since these run power to the drive motors I need at least 15 amps of current and I would like to have a buffer up to 20 for the EZB V4, and other smaller electronics.
The main batteries are Lipo 40v
The drive motors are 18v
Then there is EZB v4
Any help is appreciated. So far I have come up with paralleling several low dropout regulators , maybe 15 or 20 together sharing a common load.
https://www.amazon.com/gp/aw/d/B002ITEL42/
You will also need the programmer to set it up:
www.amazon.com/gp/aw/d/B000BOG8V0/
Alan
Why do you need 40v batteries?
So they output 9 amps if are fed a 40v input based on that output chart. So if that is the case I would need two in parallel with diodes to control forward voltage right?
Do you think the 18v drill motors would still do ok at 12 volts? I am using hammer drill motors that have 600 oz in with 18v. I imagine it would still output at lease half of the 600 at 12 volts.
Using a regulator for motors is not a good idea. Check my response in this thread http://www.ez-robot.com/Community/Forum/Thread?threadId=8803
The electric mower I am using as the donor chassis for the robot mower runs on 40 volts DC as well as the filament trimmer heads I have. When I bought the mower I inherited 4 x 40v 2.4ah batteries and my brother bought me a new 40v 5 ah battery as well. I wouldn't want to run the drill motors on 40 volts as that might create excess heat. Anyways hopefully that explains in short.
this is the donor
40v Lipo brushless mower by ryobi I scored for $149
1.2" (30mm) x .6" (15mm) x .4" (10mm) , Weight: .4oz (11g)
Input voltage: 5V to 25.2V (2S to 6S LiPo)
Current output: 12 volts input = 7 amps continuous, 10 amp peak
Current output: 24 volts input = 5 amps* continuous, 7 amp peak
Selectable Output: 4.8 - 9.0V via the Castle Link (sold separately), Default voltage is 5.1V
I use two of these on each of my B9 arms to adjust voltage from 12v down to 7 and 6 volts for servos. Their small and pricey but really stand up and do the job. There are three wires for output. I just use the red and balck for voltage and snip off the third.
Here's an amazon link:
10 amp CC Bec
Here's the Castle Link:
Link