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Geoff Heap
Joined: 12 Jan 2006
Posts: 266
Location: Lindenwold, New Jersey
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 Posted: Mon Jan 26, 2009 3:08 pm Post subject: Battery cover answer...Giving back |
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I'm building a 701 but this probably applies to any Zenith design.
I'm concerned about failing final FAA inspection due to the fact that I don’t use the battery cover from Zenith so I posted the following on the more general MATRONICS ZENITH list hoping to get a quick answer. It read
A lot of builders including myself have Modern SEALED Recombinant Gas, 12V, Concorde batteries.
Quote from Website follows.
"Construction allows for recombination of hydrogen and oxygen created in the charge cycle, eliminating explosive gasses, corrosive fumes, and the need for routine maintenance. Replaces Manifolded & Gel Batteries"
Does this negate the need for a cover and a drain over board?
I understand that the FAA or DAR inspector may have to defer to the FAA specs. Is there a modification to accommodate these newer batteries?
42 hits (views) and not one comment.
I did get a personal Email from a DAR.
He said “Unless you are building to a standard that specifies that you need a vented batt box then you do not need it for an experimental home built.” Thanks Chuck.
So I started with Concorde battery. My email follows.
Can you make a statement regarding the need for a battery cover and a vent line overboard for a Recombinant gas battery? I am using your CB 25RG in the aircraft I am currently building. My battery is held securely in place and I have not put a cover on it. In my opinion, based on what I've read about RG batteries. I don't need one and it would be pointless.
The battery is in a safe area that is not accessible unless an inspection cover is removed first.
The terminals are covered and safe.
My intention is to seek a statement from Zenith Aircraft that removes the need for a cover to be fitted. Their plans go back to the 1980's at least. Before builders were using this battery. Your opinion would be of help with this.
Without a written statement from them (The designers) regarding the cover I may not pass FAA inspection. I would appreciate any help in this matter. And a lot of other builders would welcome it too. Many thanks Geoff Heap.
I was answered by the VP of Marketing. His reply follows
Concorde RG series aircraft batteries are properly called valve regulated lead acid (VRLA)
Each cell has a vent (pressure relief) valve that remains closed in normal operation
In the event of overcharging the battery with either internal or external power, the valves will open to prevent the case from rupturing.
Because the RG series batteries do not have any free electrolyte, they are classified as non-spill able and can be shipped by air as “NON-HAZMAT”
Aircraft installations do not need a battery box and drain, the RG series batteries can be mounted in a frame or on a shelf and do not need vent tubes for cross flow ventilation.
The battery compartment cannot be sealed (water tight) the compartment needs to have a means of breathing as the battery vent valves keep .5 to 1 psi of internal pressure over the outside atmospheric pressure.
Finally I talked to Travis at Zenith(I had been getting a busy signal for hours. That’s why I went to Concorde first)
Travis said that Zenith has never had a design requirement to use the cover.
Well that kills it dead. There is no requirement for a 701 to have a cover on the battery
Hope this is of use to anyone who does not want to fit the cover. It appears to be optional. I don’t see a use for it. If my battery in an exposed position such as in front of the firewall then I would fit it. Disclaimer. This is my personal opinion only. If your have a strong opinion the other way I'd like to hear your reasons. I'd also like to know why you couldn’t give it before when I asked for comments. Isn't that why we’re all here?
…………. Geoff
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notsew_evets(at)frontiern
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| Posted: Mon Jan 26, 2009 3:43 pm Post subject: Battery cover answer...Giving back |
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dwilde(at)clearwire.net
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| Posted: Tue Jan 27, 2009 7:49 am Post subject: Battery cover answer...Giving back |
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I installed a sealed battery in my 701. I also installed the battery
box but it has no drain and the DAR was ok with that when I told him it
was a sealed battery. I did put the cover on the box just to protect
the battery leads from foreigners.
DW
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