Low Voltage Threshold/6v systems
07-02-2006, 08:54 PM
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Low Voltage Threshold/6v systems
Hey Guys---For those still using 6v NiMh onboard radio power/supply systems---What #s should I be using for low threshold/no fly voltage---(dual redundent batts---2000ma ea.)
Thanks
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07-02-2006, 09:43 PM
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RE: Low Voltage Threshold/6v systems
I personally won't fly my planes at or under 6 volts. In fact I like it to stay above the 6 volt mark lately. If it measures 6.10 volts loaded, I'm ok to fly but that's the last flight of the day. It all depends on your comfort level. The planes I fly are getting expensive so I add more safety factor.
If it's a $100 profile, I'll fly it down to 6.0 or even 5.9 but that's a cheaper plane and does not use that much juice (standard servos).
If it's a $100 profile, I'll fly it down to 6.0 or even 5.9 but that's a cheaper plane and does not use that much juice (standard servos).
07-02-2006, 09:49 PM
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RE: Low Voltage Threshold/6v systems
My digital voltmeter from Hobbico flashes from good to recharge at 5.9 volts but I wont fly when I am getting close to the 6v mark.
07-04-2006, 10:16 AM
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RE: Low Voltage Threshold/6v systems
just remember that with NIMH/NICAD you will get a memory on your cells.
so if you consistently stop flying at above 6v then that will end up being your dead battery point. How long this takes to happen is uncertain as different brands and batts are effected differently.
Simply once a month or so discharge your pack to 6v.....then let cool and recharge. (Triton charger will do this for you).
so if you consistently stop flying at above 6v then that will end up being your dead battery point. How long this takes to happen is uncertain as different brands and batts are effected differently.
Simply once a month or so discharge your pack to 6v.....then let cool and recharge. (Triton charger will do this for you).
07-04-2006, 01:18 PM
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RE: Low Voltage Threshold/6v systems
If you properly load your battery when you measure voltage, you can go down to 6 volts and be safe enough for a normal flight.
07-04-2006, 03:21 PM
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RE: Low Voltage Threshold/6v systems
"Cut-off" voltage, the voltage at which a cell will drop off fast is 1.1 volts per cell. That is the point the pack will quit working, not safe voltage. I think about 5.9 or 6 volts is a safe place.
07-05-2006, 10:05 PM
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RE: Low Voltage Threshold/6v systems
Every pack is different. The best and safest thing you can do is cycle your pack to see what the capacity is. Now go fly it for three or four 15 minute flights. Use a timer here, no guess work. Now go home and cycle it down and see what's left. Now you can determine how many mAh are being used per flight. Cycle your battery down to 6 volts, then see how much capacity you have from there down to 5.5. On a NiMH pack, chances are once you hit 6.0 volts on your 2000 mAh packs, you'll only have about 350 to 400 mAh left in the pack.........
