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#1
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Battery safety (againish)
Was wondering if others had read and were doing this:
https://www.dg-flugzeugbau.de/wp-con...2019-103-e.pdf The ASG-29E has a gas tank directly above two batteries used to power flight instruments. |
#2
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Battery safety (againish)
On 3/16/19 10:05 AM, Jonathan St. Cloud wrote:
Was wondering if others had read and were doing this: https://www.dg-flugzeugbau.de/wp-con...2019-103-e.pdf The ASG-29E has a gas tank directly above two batteries used to power flight instruments. Interesting that they say to add epoxy to the casing. Putting a fuse at one of the battery terminals would be a more conventional way of handling it, and would allow for easier battery replacement. |
#3
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Battery safety (againish)
On Saturday, March 16, 2019 at 1:04:19 PM UTC-4, kinsell wrote:
On 3/16/19 10:05 AM, Jonathan St. Cloud wrote: Was wondering if others had read and were doing this: https://www.dg-flugzeugbau.de/wp-con...2019-103-e.pdf The ASG-29E has a gas tank directly above two batteries used to power flight instruments. Interesting that they say to add epoxy to the casing. Putting a fuse at one of the battery terminals would be a more conventional way of handling it, and would allow for easier battery replacement. You are missing the point. The fuse will not protect against internal short. |
#4
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Battery safety (againish)
On 3/16/19 1:10 PM, Andrzej Kobus wrote:
On Saturday, March 16, 2019 at 1:04:19 PM UTC-4, kinsell wrote: On 3/16/19 10:05 AM, Jonathan St. Cloud wrote: Was wondering if others had read and were doing this: https://www.dg-flugzeugbau.de/wp-con...2019-103-e.pdf The ASG-29E has a gas tank directly above two batteries used to power flight instruments. Interesting that they say to add epoxy to the casing. Putting a fuse at one of the battery terminals would be a more conventional way of handling it, and would allow for easier battery replacement. You are missing the point. The fuse will not protect against internal short. No, not missing the point. The way I read it, they're talking about an battery holder added around the battery. You wouldn't normally call internal wiring "battery cables". Maybe something got lost in translation. If anybody is using a battery so poorly constructed that it shorts out internally and catches fire, that battery should be discarded immediately. |
#5
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Battery safety (againish)
On Saturday, March 16, 2019 at 7:35:22 PM UTC-4, kinsell wrote:
On 3/16/19 1:10 PM, Andrzej Kobus wrote: On Saturday, March 16, 2019 at 1:04:19 PM UTC-4, kinsell wrote: On 3/16/19 10:05 AM, Jonathan St. Cloud wrote: Was wondering if others had read and were doing this: https://www.dg-flugzeugbau.de/wp-con...2019-103-e.pdf The ASG-29E has a gas tank directly above two batteries used to power flight instruments. Interesting that they say to add epoxy to the casing. Putting a fuse at one of the battery terminals would be a more conventional way of handling it, and would allow for easier battery replacement. You are missing the point. The fuse will not protect against internal short. No, not missing the point. The way I read it, they're talking about an battery holder added around the battery. You wouldn't normally call internal wiring "battery cables". Maybe something got lost in translation. If anybody is using a battery so poorly constructed that it shorts out internally and catches fire, that battery should be discarded immediately. They are not adding a housing they are internally fixing it with PU resin because they had internal short circuit. |
#6
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Battery safety (againish)
Some, maybe all LiFePO4 batteries are made up of individual cells wired
together in series to make up the full voltage.Â* If that setup is simply stuffed into a plastic case and not secured, things can rattle around, possibly allowing uninsulated interconnecting wires to short together.Â* I might try stuffing foam into the battery case rather than filling it with resin.Â* A fuse on the output cable should be considered mandatory. On 3/16/2019 6:34 PM, Andrzej Kobus wrote: On Saturday, March 16, 2019 at 7:35:22 PM UTC-4, kinsell wrote: On 3/16/19 1:10 PM, Andrzej Kobus wrote: On Saturday, March 16, 2019 at 1:04:19 PM UTC-4, kinsell wrote: On 3/16/19 10:05 AM, Jonathan St. Cloud wrote: Was wondering if others had read and were doing this: https://www.dg-flugzeugbau.de/wp-con...2019-103-e.pdf The ASG-29E has a gas tank directly above two batteries used to power flight instruments. Interesting that they say to add epoxy to the casing. Putting a fuse at one of the battery terminals would be a more conventional way of handling it, and would allow for easier battery replacement. You are missing the point. The fuse will not protect against internal short. No, not missing the point. The way I read it, they're talking about an battery holder added around the battery. You wouldn't normally call internal wiring "battery cables". Maybe something got lost in translation. If anybody is using a battery so poorly constructed that it shorts out internally and catches fire, that battery should be discarded immediately. They are not adding a housing they are internally fixing it with PU resin because they had internal short circuit. -- Dan, 5J |
#7
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Battery safety (againish)
On Saturday, March 16, 2019 at 4:35:22 PM UTC-7, kinsell wrote:
On 3/16/19 1:10 PM, Andrzej Kobus wrote: On Saturday, March 16, 2019 at 1:04:19 PM UTC-4, kinsell wrote: On 3/16/19 10:05 AM, Jonathan St. Cloud wrote: Was wondering if others had read and were doing this: https://www.dg-flugzeugbau.de/wp-con...2019-103-e.pdf The ASG-29E has a gas tank directly above two batteries used to power flight instruments. Interesting that they say to add epoxy to the casing. Putting a fuse at one of the battery terminals would be a more conventional way of handling it, and would allow for easier battery replacement. You are missing the point. The fuse will not protect against internal short. No, not missing the point. The way I read it, they're talking about an battery holder added around the battery. You wouldn't normally call internal wiring "battery cables". Maybe something got lost in translation. If anybody is using a battery so poorly constructed that it shorts out internally and catches fire, that battery should be discarded immediately. The way I read it is a small hole is drilled in the case and resin injected...? |
#8
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Battery safety (againish)
On Saturday, March 16, 2019 at 8:34:16 PM UTC-4, Andrzej Kobus wrote:
On Saturday, March 16, 2019 at 7:35:22 PM UTC-4, kinsell wrote: On 3/16/19 1:10 PM, Andrzej Kobus wrote: On Saturday, March 16, 2019 at 1:04:19 PM UTC-4, kinsell wrote: On 3/16/19 10:05 AM, Jonathan St. Cloud wrote: Was wondering if others had read and were doing this: https://www.dg-flugzeugbau.de/wp-con...2019-103-e.pdf The ASG-29E has a gas tank directly above two batteries used to power flight instruments. Interesting that they say to add epoxy to the casing. Putting a fuse at one of the battery terminals would be a more conventional way of handling it, and would allow for easier battery replacement. You are missing the point. The fuse will not protect against internal short. No, not missing the point. The way I read it, they're talking about an battery holder added around the battery. You wouldn't normally call internal wiring "battery cables". Maybe something got lost in translation. If anybody is using a battery so poorly constructed that it shorts out internally and catches fire, that battery should be discarded immediately. They are not adding a housing they are internally fixing it with PU resin because they had internal short circuit. 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. |
#10
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Battery safety (againish)
On Saturday, March 16, 2019 at 8:31:57 PM UTC-7, wrote:
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. Probably not if a self launch is electric or has a Wankel engine that isn't doing its best to rattle your teeth fillings loose. With an engine that could pass for a paint mixer, the resin may keep things from rattling enough to chafe and perhaps short the battery internals. |
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