nuckolls.bob(at)aeroelect
Guest
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 Posted: Thu Apr 25, 2013 6:00 am Post subject: Shorai Battery Review |
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At 08:57 PM 4/22/2013, you wrote:
| Quote: | | Bob, Haven’t been on the list for a while and have forgotten how to post. |
Just send a message to aeroelectric-list(at)matroics.com
This will start a new thread of discussion with what ever
topic you put on the subject line . . .
| Quote: | | I have read all the posts on the Shorai batteries and was wondering if you have additional opinions as to whether they would be suitable in OBAM aircraft since Boeing has “solved” the Lithium Ion problems on the 787s. |
Actually, Boeing has not solved the Li-Ion battery
problem, they've only contained it. The batteries
are to be enclosed in a titanium box with vents appropriate
to expel the products of combustion assuming that one or
more cells goes into catastrophic self destruction.
I spent a good part of yesterday with Skip Koss and
crew who were representing Concord at a convention in
Wichita. Seems that the major players have given up trying
to quantify reliability numbers for the cells and have
elected to apply a lot of electronic monitoring and
control for managing charge and discharge profiles
of individual cells while closely monitoring temperatures.
It's a case of adding very complex electronic housekeeping
to robust containment for what started out to be a
simple one-for-one replacement of legacy Ni-Cad/Lead-Acid
with Li-Ion.
Pundits in the know are now predicting that a positive
return on investment for Boeing's shift to Li-Ion is
decades out . . . if ever.
The Shorai offering is a study in contradictions. On
one hand, the batteries are offered as drop in
replacement for legacy battery products wherein
responsibility for managing the charge and discharge
profiles are NOT tailored to the product. At the same
time, each battery is fitted with a 5 pin maintenance
port to accommodate a specialty charger. Literature for
the battery says:
**Note:The Shorai LFX battery may not be used with a lead-acid battery charger with an automatic desulfation mode that cannot be disabled. We recommend the Shorai LFX Battery Charger to properly charge and perform cell diagnostics on this high performance battery, or the MotoStance MS1000 Battery Charger.
This is the first time I've seen any mention of "desulfation"
features being undesirable in the context of Li-Ion
discussions. I've not read any convincing discussion
on the effectiveness of special desulfation processes
added to chargers or maintainers. Desulfation technologies
are a mixed bag . . . and I'm not sure they're even
applicable to anything other than abusive, deep-discharge
service.
The well cared for aircraft battery NEVER gets deep
discharged. It coughs up 2% of contained energy
to start an engine . . . hundreds of times . . . but
is immediately serviced by a working alternator.
Conditions favorable to lead-sulfate crystal growth
are weak.
In one breath, the Li-Ion guys talk about their specialized
chargers designed to get the most from their product . . .
in the next breath, they say the product is a drop-in
replacement for an SVLA battery that receives less
than specialized charging from an alternator-regulator
that might not even be adjustable!
The Shorai LFX charger offers the ultimate pampering
of the battery while a MotoStance MS1000 is just
an SVLA charger/maintainer . . . I'm westling with
the logic that says they can have it both ways.
Bob . . .
[quote][b]
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