Slee
(Steven Lee)
March 9, 2022, 11:13am
1
Hi all,
Does anybody have any experience with voltage drop through the High Power Tether used with the OTPS kit? We are looking to operate with tether lengths possible greater than the recommended 300m but want to see if there are any problems that will occur? Thanks
EliotBR
(Eliot)
March 9, 2022, 11:46am
2
Hi @Slee ,
This is likely useful:
Power Transfer (Tether)
As per our voltage drop calculator , a 125m High-Power Tether Cable using two pairs of 23AWG wires to carry 400V, with a load draw of 1087W, would have an efficiency of ~94.1%. If you’ve got the longer 250m tether then the efficiency is ~87.3% instead. Accordingly, 1000W of power in the ROV uses 1200 / 0.941 \approx 1275 W of input power at the top side, or ~1375 W for the longer tether.
That comment has additional calculations about the rest of the system around it, which may also be of interest
EDIT : realised the tether efficiencies were slightly lower than they were supposed to be - have updated the source post and the quote.
Slee
(Steven Lee)
March 9, 2022, 11:50am
3
That’s awesome @EliotBR thank you for bringing that to my attention
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