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Excalibur supply voltage range?

B

bklein

Active member
Has anyone done any work characterizing Excal performance vs battery voltage?
I've read some threads that give a pretty broad voltage range for the unit. I'm wondering where things start to get flakey (low voltage) and on the other end, if higher voltage increases depth range any.
I'm also curious as to what the range of current demand is. I want this to better understand the battery connector design and perhaps replace it with another type.
 
I've ran a 16.8 volts LiPo and No different in performance other then once you get down under 12 volts, it will go stupid. And this can vary battery to battery. I have the EX3000 it is still going strong at 11.5 volts.


As far as the boards and each version, Ive yet to see any changes that would set one different then the next version. I can see the changing of vendors, some with the same versions having different looking components. Bottom line is the finally product is BBS and very little different in performance from one to the next.
 
Originally I had two boards, repaired them and sent them back. They had different markings and color of components as you say. One board had better sensitivity than the other with the crappy coil I was using. Now I have one of those two boards back (damaged traces to fix again). Got an Excal II decal with the kit. Just want to keep honest if the board is not really an Excal II.

On the battery, once charged a 4 series cell Lipoly - depending on whether 3.8 or 3.7V cells used - might start at 16V fresh from the charger (cutoff 4.0V).
(Need to use 4 cells to get the most duration out of the pack - keep voltage up past 10.5V.) The electrolytic and some tantalum caps on the boards are 16V rated and might fail.

AA alkalines might be 1.3V each or so once expired, for 10.4V for an 8 cell pack. A 3 lipoly cell might average ~10.5V for the majority of use (~3.5V is around the normal baseline for each).
So I'm really wondering what the optimum operational voltage range is. I'll try my bench supply once I get the board working. Anyone know how many cells are used in the aftermarket Lipoly packs?
 
LiPo I've been using for about 3 years now..still holds 16.8 to 12V for about 45 hours. And the stock battery..14.1V

I do have a EX3000 but will have to pull to check the cells.
 
I hooked my board up to a power supply and had functionality even down to 10V.
Current draw 130ma over 10-12V range.
 
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