John,
that is really interesting. Have you sampled more than one battery or repeated
the test on the same battery?
Michael Scutter,
Education & Training Consultant,
Email: michael_scut...@yahoo.com.au
Mobile: 0417822330 (Int +614178223300)
skype://michaelscutter
I don't say anything here that I would not say to your face.
________________________________
From: John Parncutt <jparn...@bigpond.net.au>
To: 'Discussion of issues relating to Soaring in Australia.'
<aus-soaring@lists.internode.on.net>
Sent: Tuesday, 26 February 2013 5:57 PM
Subject: Re: [Aus-soaring] LiFePo4
Hi David,
The link you provide is to exactly the same model of Shorai battery I have been
evaluating. The load tests I have done give it an actual capacity of 4 A/H
(far from the stated capacity of 14 A/H).
I have attached an image of the results for your info, for comparison the
results on one of our clubs existing (used) lead acid glider batteries is also
included.
This clearly demonstrates the ability of the Lithium battery to provide an
almost constant voltage across its complete discharge period whereas the lead
acid battery voltage continually drops to a point where some of our
instrumentation and particularly the radio in transmit mode may fail about
halfway through discharge.
If you note the Shorai literature states an equivalent A/H rating to that of a
14 A/H lead acid battery not an actual A/H rating. This is misleading and I
think a bit of sales spin! The comparison I think is based on the Cold Cranking
capacity of the battery, ie. the ability to delivery large currents to a
starter motor bearing in mind these batteries are designed to replace wet lead
acid motorcycle batteries.
The bottom line is that the 14 A/H Shorai battery will not deliver 1 amp
continuously for 14 hours, well certainly not the one I tested!!
John Parncutt
From:aus-soaring-boun...@lists.internode.on.net
[mailto:aus-soaring-boun...@lists.internode.on.net] On Behalf Of David Conway
Sent: Tuesday, 26 February 2013 4:38 PM
To: 'Discussion of issues relating to Soaring in Australia.'
Subject: Re: [Aus-soaring] LiFePo4
Agreed; something like this would be better
http://www.shoraipower.com/s.nl/it.A/id.91/.f
14AH – twice that of a normal SLA glider battery – and less than half the
weight @ 662g
David
From:aus-soaring-boun...@lists.internode.on.net
[mailto:aus-soaring-boun...@lists.internode.on.net] On Behalf Of Future Aviation
Sent: 26 February 2013 15:02
To: 'Discussion of issues relating to Soaring in Australia.'
Subject: Re: [Aus-soaring] LiFePo4
Hi Ian
From a safety point of view this is much better than what the Boeing dreamliner
is using.
However, I would never put a battery like that in a glider unless it is
securely placed
in a much more impact resistant enclosure.
Kind regards
Bernard
________________________________
From:aus-soaring-boun...@lists.internode.on.net
[mailto:aus-soaring-boun...@lists.internode.on.net] On Behalf Of Ian Mc Phee
Sent: Tuesday, 26 February 2013 2:15 PM
To: Discussion of issues relating to Soaring in Australia.
Subject: [Aus-soaring] LiFePo4
About $87 and notice a new Arcus M was fitted at factory with something
similar. This is NOT what B787 is using.
Ian M
http://www.hobbyking.com/hobbyking/store/__22656__ZIPPY_Flightmax_8400mAh_4S2P_30C_LiFePo4_Pack_AUS_Warehouse_.html
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