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Discharge rate during Nimh cycle

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Old 05-12-2018, 05:34 PM
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golf4two
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Default Discharge rate during Nimh cycle

During an nimh cycle process, what discharge rate would be appropriate to approximate that of an electronic ignition (RCExcel on 20CC gasser)?
Practical test is not possible yet as the a/c is still under construction.
Been building my own packs for many years using Eneloop cells and have had great success. However, the latest batches of new cells I've received are not nearly as robust (i.e., suspect). Will eventually switch to Life packs but in the meantime.....

Any practical guesses?
Thanks, G42
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Old 05-13-2018, 05:32 PM
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All Day Dan
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It's best to discharge the battery pack at a rate that closely matches the consumption of the device you are using.This gives a good idea of the flying time you can safely use. Use a cutoff voltage of 1.1 volts per cell. Get in touch with Adrian at his website and ask him. He tests all of his products and will tell you. Dan.

https://www.ch-ignitions.com/
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Old 05-14-2018, 05:13 PM
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Thanks Dan. I sent Adrian a PM. Will post his reply, if any.
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Old 05-15-2018, 11:40 AM
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its best to discharge a nimh battery above your planned use amps. if your gonna draw 15 amp for 5 minutes better discharge battery at 18 as long as it will last.
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Old 05-15-2018, 01:52 PM
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Originally Posted by tntpooof View Post
its best to discharge a nimh battery above your planned use amps. if your gonna draw 15 amp for 5 minutes better discharge battery at 18 as long as it will last.
The original question is/was, what will the amp draw be? I don't know too much about the subject, but I doubt that an electronic ignition for a small CC gasser is going to draw 15 Amps.
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Old 05-15-2018, 01:57 PM
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get a watts up meter and plug it in..theres your answer.https://powerwerx.com/watt-meter-ana...BoC3RgQAvD_BwE
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Old 05-15-2018, 03:11 PM
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As I mentioned in my first post, the airplane is not finished yet. I'm trying to "right size" an ignition battery pack in an effort to minimize expenses and still get it "right".
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Old 05-19-2018, 07:23 AM
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CH Ignitions
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Hi Guys, Sorry took so long to get here.

A CH or RCEXL CDI it will draw around 400-500mha at full RPM, I check at 10000 RPM
When you idle will be like 50-70mha and as RPM increase the draw increase,
A 2100MHA should last you a 4-5 Hours of continue flight at full throttle.

Adrian
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Old 05-19-2018, 05:45 PM
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Originally Posted by CH Ignitions View Post
Hi Guys, Sorry took so long to get here.

A CH or RCEXL CDI it will draw around 400-500mha at full RPM, I check at 10000 RPM
When you idle will be like 50-70mha and as RPM increase the draw increase,
A 2100MHA should last you a 4-5 Hours of continue flight at full throttle.

Adrian
Thank you very much...I really appreciate your effort and answer.
G42
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