On 11/26/20 2:55 PM, AS wrote:
On Thursday, November 26, 2020 at 1:02:00 PM UTC-5, Eric Greenwell wrote:
AS wrote on 11/26/2020 8:59 AM:
On Thursday, November 26, 2020 at 11:19:57 AM UTC-5, wrote:
I have used such a battery since July. Works just fine for me in my ASG 32 Mi with lots of electronic stuff.
/Robert
So there is already some operational experience with this type of batteries, which is good to hear. The warnings about the initially high voltage of 16+V is well taken. I checked the spec's of the stuff I have on and behind my panel and most of it is limited to only 15V.
That would lead me to more follow-up questions for the experts:
- what would happen if this battery was charged with only 15V?
- if the above is not advisable, would the use of an electronic voltage regulator like this one be an option?
https://vetco.net/products/dc-dc-adj...kaAnEdEALw_wcB
- I am not familiar with this type of electronics but reading the specifications of it, I see a 'Ripple Frequency' of 150kHz on the output. Could that mess up the electronics?
Thanks for any constructive replies.
The voltage regulator might cause radio and other interference, adds complexity, and one more
item to fail, possibly damaging the devices it was supposed to protect. There seems to be no
sufficient reason to consider this chemistry, compared to LiFe batteries, unless you are space
limited, due to higher cost and risk of over-voltage.
Is battery space insufficient on your glider?
--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1
Good points, Eric.
I currently have room for and use two 12V LiFe batteries (K2) but I get low voltage warnings on my SN10b fairly early into the flight when keying the radio, a KTR72N. The batteries are only two seasons old. I may have some other, more power hungry equipment, like a Volkslogger functioning only as the GPS source, which may have a higher draw.
My goal is to get rid of the Volkslogger but in parallel, I was thinking about upgrading the batteries. However, that seems to be not as easy as cleaning up my panel.
Uli
'AS'
Just to pile on a little bit more, the type of battery you're looking at
is commonly called lithium-cobalt and isn't new at all. Someone at
Boeing thought it sounded really neat, and designed it into the 787.
After a few fires, they 'fixed' the problem by putting them in steel
containment boxes with blowout plugs to the atmosphere.
https://www.youtube.com/watch?v=rvkEpstd9os&t=280s
Switching to a battery like that in order to fix what is likely a wiring
issue isn't a good idea.