O no another battery question lol wookong settings
- Thread starter VINHEX
- Start date
KopterX
Member
1. A fully charged Lipo Battery is a 4.2V/cell, that is 12.6V for a 3S Lipo.
2. I suggest about 3.6V/cell per cell for first level protection, this is 10.8V for 3S LIPOs.
3. For second level i suggest to not go lower than 3.3V per cell because you might damage the Lipo pack, for a 3S this is 9.9.
4. Put around 0.3V Line Loss (0.1Vper cell for new batteries), and do a fly test. After you land, measure again, if the voltage is higher than you wanted, increment with more 0.1V until you find the correct line loss and get the end voltage you want. But if the Lipo is in good condition, your line loss must be around 0.3V for a 3S pack. Usually this is about 0.1 volt per cell with a new Lipo and it will increase in time when the battery will be older. You should check this again after 20-30 cycles.
5. If the time between first voltage protection and second is to short increase the value at first level protection until you get about 25-30 seconds time.
Line loss is the difference between voltage of your LIPO when you fly and the Lipo is LOADED (meaning there is a current load on the battery) and the voltage measured when the Lipo is disconnected from your copter, and there is NO LOAD on the LIPO pack.
There is an alternative way. You can measure the LOADED voltage by strapping the copter to your table and measure the voltage while motors running and stick is at 50%. Be very carefully if you do it this way, propellers can easy cut your fingers off!
2. I suggest about 3.6V/cell per cell for first level protection, this is 10.8V for 3S LIPOs.
3. For second level i suggest to not go lower than 3.3V per cell because you might damage the Lipo pack, for a 3S this is 9.9.
4. Put around 0.3V Line Loss (0.1Vper cell for new batteries), and do a fly test. After you land, measure again, if the voltage is higher than you wanted, increment with more 0.1V until you find the correct line loss and get the end voltage you want. But if the Lipo is in good condition, your line loss must be around 0.3V for a 3S pack. Usually this is about 0.1 volt per cell with a new Lipo and it will increase in time when the battery will be older. You should check this again after 20-30 cycles.
5. If the time between first voltage protection and second is to short increase the value at first level protection until you get about 25-30 seconds time.
Line loss is the difference between voltage of your LIPO when you fly and the Lipo is LOADED (meaning there is a current load on the battery) and the voltage measured when the Lipo is disconnected from your copter, and there is NO LOAD on the LIPO pack.
There is an alternative way. You can measure the LOADED voltage by strapping the copter to your table and measure the voltage while motors running and stick is at 50%. Be very carefully if you do it this way, propellers can easy cut your fingers off!
KopterX
Member
That rule is a bit outdated, we usualy go here up to 90%-95%, but that's just our conclusion.
KopterX
Member
Well, as I said it before in another thread...
There is a 80% rule of the LIPOs, you may find a lot of chats subject searching google: "LIPO 80% rule". However, this rule is about a 10 year old technology. With new generation LIPOs i found that is ok to go even close to 100%.
I go usually go down to 3.0V per cell and about 100% of battery capacity. I may lose some cycles, but this is a compromise i make for longer flights. But i would not recommend this if you does not use telemetry for Voltage, Current, Capacity and battery temperature and you fly aggressively.
My conclusion, and please take it as personal opinion, is that you can go to 95% of battery capacity without loosing cycles.
Anyway battery are not so expensive anymore. So, if normally a LIPO goes easy up to 300-400 cycles using the 80% rule, and goes only 250 Cycles at 95% rule, why not chose to "abuse it" using the 95% rule? You will have longer flights but you will buy new batteries more often. So what? It's more joy, and you deserve it.
After all is a just comfort/price choice.
There is a 80% rule of the LIPOs, you may find a lot of chats subject searching google: "LIPO 80% rule". However, this rule is about a 10 year old technology. With new generation LIPOs i found that is ok to go even close to 100%.
I go usually go down to 3.0V per cell and about 100% of battery capacity. I may lose some cycles, but this is a compromise i make for longer flights. But i would not recommend this if you does not use telemetry for Voltage, Current, Capacity and battery temperature and you fly aggressively.
My conclusion, and please take it as personal opinion, is that you can go to 95% of battery capacity without loosing cycles.
Anyway battery are not so expensive anymore. So, if normally a LIPO goes easy up to 300-400 cycles using the 80% rule, and goes only 250 Cycles at 95% rule, why not chose to "abuse it" using the 95% rule? You will have longer flights but you will buy new batteries more often. So what? It's more joy, and you deserve it.
After all is a just comfort/price choice.
KopterX
Member
With the settings i gave you first time, if you land between first and second level protection you will be around 85% of capacity. If the multirotor lands itself on second level protection you will be close to 90% of capacity. These are safe settings which I suggest you should use if you don't have voltage, amp and temperature telemetry. I usually go a little more beyond this levels using values from telemetry.
quadcopters
Quadcopters.co.uk Drone Specialists
Temp telemetry would be for the escs , generally you would fit the sensor right onto 1 of the esc's or push the cable into the esc heatshrink .
This obviously will only tell you the temp of 1 esc but there usually within a few degrees of each other so will give a good idea if running too hot .
Geoff
This obviously will only tell you the temp of 1 esc but there usually within a few degrees of each other so will give a good idea if running too hot .
Geoff
quadcopters
Quadcopters.co.uk Drone Specialists
Hi Vin
Should be here for Monday Morning the datalinks and we have a few TM100 modules in stock with voltage and temp sensor .
G
Should be here for Monday Morning the datalinks and we have a few TM100 modules in stock with voltage and temp sensor .
G
VINHEX
Member
Hi, just charged 3s 3300
Flight time was 8.5 when first warning came in, 9 min when red came in and landed.
Battery charge said
3.78, 3.61, 3.73
This is with the settings as suggested. Which settings should I change if you recommend pulling a little more.
1. A fully charged Lipo Battery is a 4.2V/cell, that is 12.6V for a 3S Lipo.<br />
<br />
2. I suggest about 3.6V/cell per cell for first level protection, this is 10.8V for 3S LIPOs. <br />
<br />
3. For second level i suggest to not go lower than 3.3V per cell because you might damage the Lipo pack, for a 3S this is 9.9. <br />
<br />
4. Put around 0.3V Line Loss (0.1Vper cell for new batteries), and do a fly test. After you land, measure again, if the voltage is higher than you wanted, increment with more 0.1V until you find the correct line loss and get the end voltage you want. But if the Lipo is in good condition, your line loss must be around 0.3V for a 3S pack. Usually this is about 0.1 volt per cell with a new Lipo and it will increase in time when the battery will be older. You should check this again after 20-30 cycles.<br />
<br />
5. If the time between first voltage protection and second is to short increase the value at first level protection until you get about 25-30 seconds time.<br />
<br />
<br />
Line loss is the difference between voltage of your LIPO when you fly and the Lipo is LOADED (meaning there is a current load on the battery) and the voltage measured when the Lipo is disconnected from your copter, and there is NO LOAD on the LIPO pack. <br />
<br />
There is an alternative way. You can measure the LOADED voltage by strapping the copter to your table and measure the voltage while motors running and stick is at 50%. Be very carefully if you do it this way, propellers can easy cut your fingers off!
Flight time was 8.5 when first warning came in, 9 min when red came in and landed.
Battery charge said
3.78, 3.61, 3.73
This is with the settings as suggested. Which settings should I change if you recommend pulling a little more.
1. A fully charged Lipo Battery is a 4.2V/cell, that is 12.6V for a 3S Lipo.<br />
<br />
2. I suggest about 3.6V/cell per cell for first level protection, this is 10.8V for 3S LIPOs. <br />
<br />
3. For second level i suggest to not go lower than 3.3V per cell because you might damage the Lipo pack, for a 3S this is 9.9. <br />
<br />
4. Put around 0.3V Line Loss (0.1Vper cell for new batteries), and do a fly test. After you land, measure again, if the voltage is higher than you wanted, increment with more 0.1V until you find the correct line loss and get the end voltage you want. But if the Lipo is in good condition, your line loss must be around 0.3V for a 3S pack. Usually this is about 0.1 volt per cell with a new Lipo and it will increase in time when the battery will be older. You should check this again after 20-30 cycles.<br />
<br />
5. If the time between first voltage protection and second is to short increase the value at first level protection until you get about 25-30 seconds time.<br />
<br />
<br />
Line loss is the difference between voltage of your LIPO when you fly and the Lipo is LOADED (meaning there is a current load on the battery) and the voltage measured when the Lipo is disconnected from your copter, and there is NO LOAD on the LIPO pack. <br />
<br />
There is an alternative way. You can measure the LOADED voltage by strapping the copter to your table and measure the voltage while motors running and stick is at 50%. Be very carefully if you do it this way, propellers can easy cut your fingers off!