Homebuilt Rov Forum

Exploring the Hobby of Building your own ROV - Imagine, Create, Inspire.
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PostPosted: Aug 22nd, 2017, 8:30 am 
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Joined: Aug 22nd, 2017, 7:42 am
Posts: 2
Hi guys and gals,
I am new to this and it is my first ROV too.
I've been looking into making a tethered ROV, not very different from OpenROV.
An important difference is that I want to transfer power over the tether to be able to charge the battery while in operation.

I have posted the top-side schematic for now.

The tether will be 24 AWG pair and hopefully very long (400m).
I expect to push 3 amps of current over this tether.
The later rectified current will be used to trickle-charge a 5Ah 3S Li-Po powering the ROV.

Please comment if you think it can be improved.

File comment: schematic
TopSide.jpg
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I have several questions on my mind:

1. How do I generate a relatively safe AC voltage (what inverter to use).
2. How do I effectively transfer power over this tether?
3. Is it achievable to use Powerline over such distances (400m)?

I will later post the bottom-side schematic where the questions are more :roll: <><


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PostPosted: Aug 25th, 2017, 8:43 am 
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Joined: Aug 22nd, 2017, 7:42 am
Posts: 2
Here is the full schematic and some more questions :D

Capture.JPG
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Is this charger-regulator sufficient to control the power flow through the battery? Can this work?


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PostPosted: Oct 26th, 2017, 8:07 am 
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Joined: Dec 18th, 2012, 5:52 pm
Posts: 182
Location: Netherlands
There is a reply somewhere stating that 48V is considered max safe voltage underwater. If you want to calculate your voltage drop there are some formulas to use. I do not known them but solar power website have lots of info about distance and gauge calculations available. I think I even saw the formulas here on the forum.


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