stoduk
commented
9 years ago Hopefully helpful: depending on which type of lithium cell you selected, you should get the values below. This is using the calculations the config setup should be using.
Might be worth rerunning the config and double checking you've selected what you meant to - I remember the menus are a bit odd (you don't just scroll down to the option you want, you have to highlight it - I forget the keys, but space bar rings a bell. It will then have an asterix by the selected option IIRC). This seems like the only way I can think that this could be user error..
If there is a genuine problem here then I'll leave it with the MoPi folks to comment :)
bash $ test_dump 1 2 5
"Rechargeable batteries"
"Two cells (e.g. double 3.6V LiPo)"
"Lithium Ion"
floor 6.0/low 6.6/good 7.000/full 7.4
bash $ test_dump 1 2 6
"Rechargeable batteries"
"Two cells (e.g. double 3.6V LiPo)"
"LiPo"
floor 6.0/low 6.6/good 7.500/full 8.4
bash $
test_dump() {
supply_type $1
num_cells $2
bat_chemistry $3
calculate_config $1 $2 $3
echo "floor $BAT_FLOOR/low $BAT_LOW/good $BAT_GOOD/full $BAT_FULL"
}
On 22 August 2015 at 21:30, James Eberhardt notifications@github.com wrote:
I've got some 18650 batteries that I'm trying to connect to the Mopi, and it's telling me I've got low voltage - I think the configuration is wrong.
I've got 2S5P connected to one power supply - that's 5 cells connected in parallel, which are then connected in series to another set of 5 in parallel. I'm pretty sure I've got them hooked up correctly. ;)
My multimeter reads the voltage not under load as 8.32V. However, I suspect the nominal voltage will be around 7.4V, since these batteries are 3.7V.
In the config setup, I choose (1)rechargeable batteries, (2)2 cells, (5) Lithium Ion. It then said the minimum safe was 8.0V, the low charge was 8.8V, the good charge was 10.00V, and the full charge was 11.2V.
I would have thought the minimum safe charge was 5.0V, the low charge was 6.0V, the good charge was 7.4V, and the full charge was 8.2V (roughly).
Is the configuration tool wrong, or is my understanding of the voltage wrong (likely the later). Should I manually override the settings? Thanks for any input you may have. I'm a little baffled by this.
[image: screen shot 2015-08-22 at 4 20 35 pm] https://cloud.githubusercontent.com/assets/77435/9425748/5b39d6ca-48ea-11e5-9e39-ef841d191c1a.png
— Reply to this email directly or view it on GitHub https://github.com/hamishcunningham/pi-tronics/issues/56.
jeberhardt
hamishcunningham
I've got some 18650 batteries that I'm trying to connect to the Mopi, and it's telling me I've got low voltage - I think the configuration is wrong.
I've got 2S5P connected to one power supply - that's 5 cells connected in parallel, which are then connected in series to another set of 5 in parallel. I'm pretty sure I've got them hooked up correctly. ;)
My multimeter reads the voltage not under load as 8.32V. However, I suspect the nominal voltage will be around 7.4V, since these batteries are 3.7V.
In the config setup, I choose (1)rechargeable batteries, (2)2 cells, (5) Lithium Ion. It then said the minimum safe was 8.0V, the low charge was 8.8V, the good charge was 10.00V, and the full charge was 11.2V.
I would have thought the minimum safe charge was 5.0V, the low charge was 6.0V, the good charge was 7.4V, and the full charge was 8.2V (roughly).
Is the configuration tool wrong, or is my understanding of the voltage wrong (likely the later). Should I manually override the settings? Thanks for any input you may have. I'm a little baffled by this.