# Connecting a 12S 100A brushless motor to CUAV V5+ **URL:** \ **Category:** PX4 Autopilot\ **Created:** [September 5, 2019, 9:01pm UTC](https://discuss.px4.io/t/connecting-a-12s-100a-brushless-motor-to-cuav-v5/12782 "2019-09-05T21:01:24Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![NJG](https://discuss.px4.io/letter_avatar_proxy/v4/letter/n/43a26b/32.png) [@NJG](https://discuss.px4.io/u/NJG)\ **Post date:** [September 5, 2019, 9:01pm UTC](https://discuss.px4.io/t/connecting-a-12s-100a-brushless-motor-to-cuav-v5/12782/1 "2019-09-05T21:01:24Z")
Does anyone how to connect a 12S 100A brushless motor to CUAV V5+? The CUAV V5+ kit comes with the HV\_PM module. But per [docs.px4.io](http://docs.px4.io) CUAV V5+ Wiring Quick Start, the power module only supports 2~10S LiPo batteries. The motor needs a 12S battery. Normal current is about 100A. Max current is 120A. How do I connect a 12S LiPo to CUAV V5+? In addition, I need to connect some servos to CUAV V5+. The document says if connecting servos, I will need to separately power them using a BEC. How to do that? ---
**Author:** ![Anuchit\_P](https://discuss.px4.io/user_avatar/discuss.px4.io/anuchit_p/32/4617_2.png) [@Anuchit\_P](https://discuss.px4.io/u/Anuchit_P)\ **Post date:** [September 22, 2019, 2:17am UTC](https://discuss.px4.io/t/connecting-a-12s-100a-brushless-motor-to-cuav-v5/12782/2 "2019-09-22T02:17:45Z")
see link below [http://ardupilot.org/copter/docs/common-using-a-current-sensor.html](http://ardupilot.org/copter/docs/common-using-a-current-sensor.html) * * * agriculture drone sprayer application ? ---
**Author:** ![NJG](https://discuss.px4.io/letter_avatar_proxy/v4/letter/n/43a26b/32.png) [@NJG](https://discuss.px4.io/u/NJG)\ **Post date:** [September 30, 2019, 9:19pm UTC](https://discuss.px4.io/t/connecting-a-12s-100a-brushless-motor-to-cuav-v5/12782/3 "2019-09-30T21:19:05Z")
Hi Anuchit\_P, thanks for the response. AttoPilot Voltage and Current Sense Breakout - 180A has been retired and is no longer for sale. Do you know if any other product can do the same? I am installing a 12S 100A bushless motor on a helicopter I built. Per CUAV web page ([http://doc.cuav.net/flight-controller/v5-autopilot/en/hv-pm.html](http://doc.cuav.net/flight-controller/v5-autopilot/en/hv-pm.html)), the HV PM power module, which comes with CUAV V5+, can connect to 3s~14s battery. Don’t know why [docs.px4.io](http://docs.px4.io) says it only supports 2~10S batteries. Following is copied from CUAV web page. The CUAV HV\_PM module is a new high voltage voltage power module independently developed by CUAV with the following features: - Higher voltage input: 10v-60v (3s~14s battery) - More accurate battery monitor: voltage detection accuracy: ±0.1v; current detection accuracy: ±0.2A - Bec (5v) max current: 5A - Max (detection) current: 60A - Maximum output current(ESC/MOTOR PORT): 60A It seems to me, I can connect to 12S batteries. But it still can’t support 100A current. Right? ---
**Author:** ![auturgy](https://discuss.px4.io/letter_avatar_proxy/v4/letter/a/e480ec/32.png) [@auturgy](https://discuss.px4.io/u/auturgy)\ **Post date:** [September 30, 2019, 9:23pm UTC](https://discuss.px4.io/t/connecting-a-12s-100a-brushless-motor-to-cuav-v5/12782/4 "2019-09-30T21:23:07Z")
Mauch sensors have treated me well: > **[100A / 200A Hall Sensor PM for Pixhawk / APM](https://www.mauch-electronic.com/apps/webstore/)** > > 100A / 200A Hall Sensor PM for Pixhawk / APM He has several options, at least one of them will likely fit your use case. They don’t include a BEC, and are ratiometric, so you need to provide a stable 5V source to them. ---
**Author:** ![Anuchit\_P](https://discuss.px4.io/user_avatar/discuss.px4.io/anuchit_p/32/4617_2.png) [@Anuchit\_P](https://discuss.px4.io/u/Anuchit_P)\ **Post date:** [September 30, 2019, 9:51pm UTC](https://discuss.px4.io/t/connecting-a-12s-100a-brushless-motor-to-cuav-v5/12782/5 "2019-09-30T21:51:25Z")
Just for your application. Max input voltage: 42V Max current sensing: 120A > **[US $14.06 5% OFF|Holybro APM Power Module With XT60 Connectors Galvanometer...](https://www.aliexpress.com/item/4000158069230.html?spm=a2g0o.productlist.0.0.442a4f40HeHxhR&algo_pvid=1e433895-eefe-4c1e-8a4e-580a80b702ef&algo_expid=1e433895-eefe-4c1e-8a4e-580a80b702ef-9&btsid=569458d8-71d0-4902-8276-37159d15cbd0&ws_ab_test=searchweb0_0%2Csearchweb201602_%2Csearchweb201603_55)** > > Smarter Shopping, Better Living! Aliexpress.com ---
**Author:** ![NJG](https://discuss.px4.io/letter_avatar_proxy/v4/letter/n/43a26b/32.png) [@NJG](https://discuss.px4.io/u/NJG)\ **Post date:** [October 3, 2019, 9:37pm UTC](https://discuss.px4.io/t/connecting-a-12s-100a-brushless-motor-to-cuav-v5/12782/6 "2019-10-03T21:37:25Z")
Thanks auturgy and Anuchit\_P. It seems Mauch sensors are what I need. I’d like to use Holybro APM PM since it is cheaper. But it supports max 10S battery only and doesn’t power servos.