bryanflood
Well Known Member
Hello all,
thought some of you might find this helpful. I mounted a second battery on my firewall of the RV-10. When I test flew the set-up a stick on thermo-couple measured that the battery was getting too hot, so I tried a number of different combinations to cool it. In the stock configuration the battery would get to about 30F above the ambient in cowl air temperature. This heating was observed even with the alternator and battery isolated from the system, so the heating of the battery observed was due to radiant heat at least in part.
After some trial and error the best solution I found was this cooling shroud made from aluminum over the stock metal battery sleeve that came with the battery. (Odyssey battery metal sleeve like what comes in the stock vans battery mount kit) A 1" blast tube attaches to the box to provide cooling air from the back of the baffles. There is about 3/8 inch gap between the metal battery sleeve and aluminum cooling shroud. The cooling shroud is attached with bolts and standoffs through the metal sleeve that holds the battery. Half of the inlet to the 1" tube has been blocked off at the baffles with no noticeable affect.
With the new cooling shroud and a thermo-couple glued to the outside of the battery plastic shell in about the center of the largest face, the greatest battery temperature I have seen is about 90 F. The ambient cowl temperature, measured between the heater valves and the battery box (to the right of the battery), typically runs about 150F in cruise and up to about 200 on the ground after landing and taxing back to the runway for another take off on a hot summer day.
https://photos.app.goo.gl/4HuJRJTeYFp5SJBk6
https://photos.app.goo.gl/W88NSfZH6eSyrvpp8
Bryan
thought some of you might find this helpful. I mounted a second battery on my firewall of the RV-10. When I test flew the set-up a stick on thermo-couple measured that the battery was getting too hot, so I tried a number of different combinations to cool it. In the stock configuration the battery would get to about 30F above the ambient in cowl air temperature. This heating was observed even with the alternator and battery isolated from the system, so the heating of the battery observed was due to radiant heat at least in part.
After some trial and error the best solution I found was this cooling shroud made from aluminum over the stock metal battery sleeve that came with the battery. (Odyssey battery metal sleeve like what comes in the stock vans battery mount kit) A 1" blast tube attaches to the box to provide cooling air from the back of the baffles. There is about 3/8 inch gap between the metal battery sleeve and aluminum cooling shroud. The cooling shroud is attached with bolts and standoffs through the metal sleeve that holds the battery. Half of the inlet to the 1" tube has been blocked off at the baffles with no noticeable affect.
With the new cooling shroud and a thermo-couple glued to the outside of the battery plastic shell in about the center of the largest face, the greatest battery temperature I have seen is about 90 F. The ambient cowl temperature, measured between the heater valves and the battery box (to the right of the battery), typically runs about 150F in cruise and up to about 200 on the ground after landing and taxing back to the runway for another take off on a hot summer day.
https://photos.app.goo.gl/4HuJRJTeYFp5SJBk6
https://photos.app.goo.gl/W88NSfZH6eSyrvpp8
Bryan
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