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06-17-2019, 04:22 PM | #1 |
Newbie Join Date: Nov 2018 Location: US
Posts: 32
| Setting low voltage cutoff
I run 5000 mAh 2s and 3s batteries on a mabma X / 3200 kv brushless setup. This is a fairly new setup for me and I just killed a battery running it too long. I've never had to program a voltage cut off before. What should I set it as, and should the cutoff be the same for 2s and 3s? Sent from my ONEPLUS A6013 using Tapatalk |
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06-17-2019, 04:51 PM | #2 |
Quarry Creeper Join Date: Jan 2017 Location: Olathe
Posts: 361
| Re: Setting low voltage cutoff
By default the Mamba X should have a cell detection and cutoff at 3.2v/cell. In Castle Link you can set the cutoff voltage to be between 3.0 and 3.5V per cell in 0.1V increments. You should set 'Cutoff Voltage' to 'Auto-Lipo' and 'Auto-Lipo Volts/Cell' to '3.2 Volts/Cell'. Some people like to keep their packs from going down to 3.2v/cell, but that has proven to be a very safe voltage for the cells. If you want to, you can set the 'Auto-Lipo Volts/Cell' to '3.4 Volts/Cell'. You will lose a bit of runtime, but you will have a little better peace of mind. When you power it up, it should make our start up sound, chime once per cell that it detects, and then play our arming tone. You can count the chimes to ensure that it is detecting your packs correctly. There should be youtube videos of people showing this off. If it doesn't make the cell count chimes, then it is not set to use Auto-Lipo. The Auto-Lipo system looks at the initial voltage it sees when powering up to detect the number of cells. A 2 cell pack starts at 8.4v and cuts off at 6.4v. A 3 cell pack starts at 12.6V and cuts off at 9.6V. Even a fully discharged 3 cell should identify as a 3 cell unless it was already way under voltage. |
06-20-2019, 05:19 PM | #3 | |
Rock Crawler Join Date: Feb 2012 Location: Michigan
Posts: 617
| Re: Setting low voltage cutoff Quote:
How about adding voltage sensing for each individual cell? It is being used in the vaping community when the boxes use li-po's so I know it can be done. It doesn't make sense to try and sense cell levels by total pack voltage. Especially with higher loads. | |
06-21-2019, 05:51 AM | #4 | |
I wanna be Dave Join Date: Feb 2017 Location: My mothers basement
Posts: 2,128
| Re: Setting low voltage cutoff Quote:
I don't think most people want to pay extra for this feature tbh. Sent from my SM-N950U using Tapatalk | |
06-21-2019, 06:50 AM | #5 | |
I wanna be Dave Join Date: Jul 2005 Location: North Idaho
Posts: 3,648
| Re: Setting low voltage cutoff Quote:
But, this hobby is all about what puts a grin on your face. If you want to make sure you do no over-discharge your packs, just bump the cutoff voltage a little, or get a lipo alarm. Last edited by Greatscott; 06-21-2019 at 06:58 AM. | |
06-24-2019, 02:15 PM | #6 | |
Rock Crawler Join Date: Feb 2012 Location: Michigan
Posts: 617
| Re: Setting low voltage cutoff Quote:
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06-24-2019, 02:17 PM | #7 | |
Rock Crawler Join Date: Feb 2012 Location: Michigan
Posts: 617
| Re: Setting low voltage cutoff Quote:
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06-24-2019, 06:02 PM | #8 | |
I wanna be Dave Join Date: Jul 2005 Location: North Idaho
Posts: 3,648
| Setting low voltage cutoff Quote:
Now, here is just another opinion of mine brother, but if you only wanted a response from Robert, you might have maybe sent him a PM, instead of posting on a public forum who's purpose is the exchange and solicitation of other people's experience, thoughts and opinions. Last edited by Greatscott; 06-24-2019 at 08:13 PM. | |
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