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Old Dec 17, 2013, 03:15 PM
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Low Voltage Cutoff Settings for Naza M

From what I've been reading, the safe cutoff for a lipo battery is 3 to 3.3 volts per cell, which is 12 to 13.2 on a 4S. The Naza software defaults to 15.4v no load for first level and 14.8 for second level protection. Is it safe to lower these values?

Thanks
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Old Dec 19, 2013, 09:57 PM
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IMO, the way DJI wants you to set the voltage cutoff settings on the Naza is wrong. The voltage drop under load parameter just unnecessarily confuses the issue. On my Naza, I have the voltage drop parameter set to zero. Level 1 is set at 14.8 (3.7V/cell) and Level 2 is set for 13.6V (3.4V/cell). I get a solid 12 minutes of flying on my 550 with ZenMuze and a Hero3 using a 6600mAh pack.

I flew my first few flights with a LED voltmeter/alarm so I could see the pack voltage in flight. It matched the voltage warning levels exactly as you'd expect.

You don't want to pull the output voltage of your LiPo below 3.0V. But going that low puts a lot of stress on the battery, it will wear out quicker. Conservatives would say 3.7V or 3.6V. I'd say no lower than 3.3V. As you can see from above, I use 3.4V.

Heat is a sign of how much you're stressing your battery. My packs are generally just a little warm after a flight.
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Old Dec 19, 2013, 11:45 PM
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The default Naza voltage protection is very conservative. I used the default setting on my stretched Talon 750 version 1 and it got me 40 minutes of flight time on a 10000mAh 3s. After I charge the battery back and found out it still had over 30% of battery left. So, in short, the default settings of the NAZA voltage protection is very good as long as your battery is not too old or C-rating is too low.

For the battery level, you should never get it under 3.6-3.7V. That should give you about 20% of battery left. That's what you want to keep your LiPo to last longer.
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Old Dec 20, 2013, 03:31 PM
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Are the values you mention the no load or loaded numbers?
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Old Dec 20, 2013, 03:35 PM
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Under loaded. I use iOSD to watch my voltage when flying FPV.

The best way to adjust it is to find out exactly how much mA you put back into the battery when you recharge it using a decent charger. Then you'll know exactly what is the voltage you should stop when it's around 20% left.

With charger like PowerLab 8, it tells you right away what the percentage left when you start charging.
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Old Mar 08, 2014, 04:05 PM
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Test of Low Voltage Cutoff

Today I decided to try some less conservative settings for the cutoff.
Im flying DJI F450 with 2x 3S 2200mAh batteries (With Zenmuse+GoPro+FPV TX and DJI 1045 props)

My NAZA-M V2 was setup to 3,40V per cell (3S=10,20V) and I led the DJI F450 hover 1 meter above the ground until it auto-landed.
When i Recharged the batteries this happened:


2211 mAh on a 2200mAh battery!!!

So clearly 3,40V per cell is to low in my case. Seeing it in rear view mirror, running two packs in parallel is reducing the load on each cell, so now i have set the limits like this instead:

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Old Mar 08, 2014, 04:26 PM
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Low Voltage Cutoff Settings for Naza M

The Naza only cares about loaded numbers. I think the unloaded and line loss are only in the interface because the current voltage reading in assistant is necessarily unloaded. But it is confusing and what's more, line loss differs per battery. My settings are 10.6v loaded level 1, and I don't use level 2 so I set it at 10.3/10.4.

3.0 and 3.3v per cell loaded is too low for a quad, you have no buffer if you are forced to punch the throttle (dropping the voltage further), can have ESCs cut out, the Naza does not monitor per-cell voltage (only pack) and further it's not good for the battery. People mistakenly think it's either 100% great or permanent damage, in reality battery rate is affected Ina graduated fashion by depth of discharge, so regularly discharging to 10.7 is going to be better for your battery long-term than regularly draining to 9.9.
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