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Battery safety (againish)
kinsell wrote on 3/16/2019 9:46 PM:
Many of us are flying with multi-cell LiFePO4 batteries that have internal wiring and are not filled with resin.* Is that a problem?* Or is the location of the batteries in this specific glider such that the resin is advisable?* A battery fire anywhere in a glider (even without a fuel tank) is catastrophic. OTOH I havn't heard of any fires with this type of battery.* It's the lithium-polymer battery pack (also much larger, with many more cells) in the FES systems that has had fires. Well, the service bulletin talks about an LFP that burned.* There was a fire in an EB-28 in Finland last year with a 10 A-H LFP.* Here's a video of an LFP burning: https://www.pilotsofamerica.com/comm...-fires.102016/ There have been claims that LFP's don't burn, but that's simply not true. The Aerovoltz battery that burned did not have a BMS; in fact, none of the Aerovoltz batteries have a BMS (battery management system). I would not want to use one, even though the short engine runs typical of self-launchers means problems would be less likely than in airplanes. The Earth-X batteries all have a BMS, seem better characterized, and I would trust them a lot more. -- 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 - "Transponders in Sailplanes - Dec 2014a" also ADS-B, PCAS, Flarm http://soaringsafety.org/prevention/...anes-2014A.pdf |
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