# Power loss and now no connection

**URL:** <https://discuss.bluerobotics.com/t/power-loss-and-now-no-connection/12800>\
**Category:** Blue Robotics Products\
**Tags:** ardusub\
**Created:** [August 23, 2022, 8:12pm UTC](https://discuss.bluerobotics.com/t/power-loss-and-now-no-connection/12800 "2022-08-23T20:12:26Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![EliotBR](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/eliotbr/32/6937_2.png) [@EliotBR](https://discuss.bluerobotics.com/u/EliotBR)\
**Post date:** [August 25, 2022, 10:46am UTC](https://discuss.bluerobotics.com/t/power-loss-and-now-no-connection/12800/2 "2022-08-25T10:46:20Z")

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Hi @SaferHarbors,

> [@SaferHarbors](#):
>
> was able to test in a pool but kept losing connection every time the thrusters engaged. Everything is from blue robotics.

I’d recommend reading the first few comments in [this thread](https://discuss.bluerobotics.com/t/raspberry-and-pixhawk-shutdown-problem/10814/2) to see a few strategies for limiting power usage by the flight controller, and making sure you have a sufficiently high capacity supply/regulator for the onboard computer to operate without disruptions.

> [@SaferHarbors](#):
>
> The power system wasnt delivering enough so i added a step up and then a step down converter.  
> 24/12-Volt 70 amp DC-DC Converter. 16 volts at the rov. Im not getting any kind of connection at all with qground.

What’s the current-capacity of the converter at each end, and have you considered voltage drop through the tether? [This comment](https://discuss.bluerobotics.com/t/inverter-generator-for-outland-power-supply/9933/2#operating-requirements-1) may be a useful summary for the parts to consider when determining topside powering requirements and efficiency. In particular, a single T200 thruster at 16 V can use up to 24 A at max throttle, so running 4 or 8 thrusters at once would need significant throttle limiting to avoid under-powering and shutting down the control electronics.

> [@SaferHarbors](#):
>
> The computer just updated to **macOS 12 Monterey**

I’ve been using Monterey for several months without issues, so that shouldn’t be a problem 🙂

> [@SaferHarbors](#):
>
> Fathom x top side illuminates showing the “Power” and “Link” status. Link status does go out after a few seconds.

Mine only does that if the tether is disconnected or something equivalent (e.g. the Fathom-X in the vehicle has insufficient power to communicate).

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