Instead of "approving" individual brands or types
of LiFePO4 it would be smarter to simply require
a BMS, either internal or external that protects
the battery against over/under temp, over under
charge/discharge and balances the cell voltages.
I note the 18 A-H LiFePO4 weighs about the same
as a 7.5 A-H sealed lead acid. If you have the
volume available a very useful increase in capacity for the same mass.
No Li-ion or LiPo, particularly the R/C model
types as they have zero protection circuitry.
Of course we have Li-ion in our phones, tablets
and some loggers but these are relatively small
and do have protection circuits built in.
Probably also able to be tossed out the clear
vision panel. That ought to go down a treat with
those below. Interesting moral issue.
NEVER try to charge any lithium batteries near or below 0 deg C.
Mike
At 12:56 PM 2/1/2019, you wrote:
Hmmm looks like the fusion battery most likely
to be fitted to gliders is No Longer Available and the rest are on sale.
I wonder why?
Mike
At 11:57 AM 2/1/2019, you wrote:
So the approval process is typically vague. I
doubt anyone is going to give you their proprietory on board circuitry.
Any LiFePO4 battery with a built in BMS should
do much the same thing. EarthX actually have
two redundant BMS built in but they are
designed to start engines and be charged in situ.
Alternatively build a pack from cells and
install an external BMS circuit board. This has
the advantage that you can manually check the
BMS performance as you have access to each cell.
LiFePO4 is currently the safest Lithium
technology but has a lower voltage per cell and
lower volumetric and mass energy than the Li-Co
lithium ion technology used in laptops, Tesla
cars, Boeing 787 (remember the fires? The
company that was subcontracted to do the BMS
managed to burn down the testing lab.) LiFePO4
ispopular in Chinese electric cars
Mike
At 08:45 AM 2/1/2019, you wrote:
From what I understand, it was looking at the
tech itself - the onboard circuitry. There
was also a bit of grandfathering since they'd
been used unofficially for a while with no
incidents. I see Sean has popped up here so
the GFA airworthiness group would be aware of
it, probably just a case of sending an email
to officially ask for approval to cad or
dc...@glidingaustralia.org, then waiting some
time for a bit of investigation.Â
----- Original Message -----
From:
"Discussion of issues relating to Soaring in
Australia." <aus-soaring@lists.base64.com.au>
To:
"Discussion of issues relating to Soaring in
Australia." <aus-soaring@lists.base64.com.au>
Cc:
Sent:
Fri, 1 Feb 2019 08:43:27 +1100
Subject:
Re: [Aus-soaring] Lithium batteries
For a rare occasion I agree with Mike.Â
What were the evaluating criteria used to approve Fusion?
On 1 Feb 2019, at 8:33 am, Mike Borgelt
<<mailto:mborg...@borgeltinstruments.com>
mborg...@borgeltinstruments.com> wrote:
I'm sure that's nice for the Fusion dealer but
these seem to be similarly specified but with
higher allowable discharge current and similar internal protection circuitry.
The internal circuitry is designed to make the
battery "look" like a standard lead acid or
gel cell type and the EarthX brand is used in
Experimental homebuilts connected to the
charging system instead of a lead acid or gel
cell. That brand also can be used for engine
starting. They are available in Australia.
There was a good article in Kitplanes a while
ago on the manufacture and testing of those.
As the battery "looks" like a standard lead
acid no mods to the aircraft charging circuit
are necessary and any good lead acid battery charger should work.
If you try to use an intelligent LiFePO4
charger you may get a conflict between the
battery internal protection and the intelligent charger. See that.
It would be nice to know what exactly the
approval process for the Fusion brand involved.
Mike
.
At 06:10 AM 2/1/2019, you wrote:
Same product (and same price) available at
Jaycar - although strictly speaking only fusion brand allowed at this stage?
<https://www.jaycar.com.au/12-8v-7-5ah-lithium-deep-cycle-battery/p/SB2201>https://www.jaycar.com.au/12-8v-7-5ah-lithium-deep-cycle-battery/p/SB2201
Nick.
On Fri, Feb 1, 2019 at 6:16 AM Mike Borgelt
<<mailto:mborg...@borgeltinstruments.com>
mborg...@borgeltinstruments.com> wrote:
This came in yesterday:
<https://www.techbrands.com/store/category/li-battery-feb19.aspx?utm_source=battery&utm_medium=Email&utm_campaign=TBNewFeb19>https://www.techbrands.com/store/category/li-battery-feb19.aspx?utm_source=battery&utm_medium=Email&utm_campaign=TBNewFeb19
These look good for avionics although you
can't use them to start an engine.
Mike
Borgelt Instruments - design & manufacture of
quality soaring instrumentation since 1978
<http://www.borgeltinstruments.com/>www.borgeltinstruments.com
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tel: 07 4635 5784 overseas: int+61-7-4635 5784
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P O Box 4607, Toowoomba East, QLD 4350,
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quality soaring instrumentation since 1978
www.borgeltinstruments.com
tel: 07 4635 5784 overseas: int+61-7-4635 5784
mob: 042835 5784 : int+61-42835 5784
P O Box 4607, Toowoomba East, QLD 4350,
Australia
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quality soaring instrumentation since 1978
www.borgeltinstruments.com
tel: 07 4635 5784 overseas: int+61-7-4635 5784
mob: 042835 5784 : int+61-42835 5784
P O Box 4607, Toowoomba East, QLD 4350, Australia
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