# Hybrid power puzzle

**URL:** <https://discuss.bluerobotics.com/t/hybrid-power-puzzle/3138>\
**Category:** General Discussion\
**Created:** [August 8, 2018, 5:09pm UTC](https://discuss.bluerobotics.com/t/hybrid-power-puzzle/3138 "2018-08-08T17:09:04Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![rperkins](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/rperkins/32/7950_2.png) [@rperkins](https://discuss.bluerobotics.com/u/rperkins)\
**Post date:** [August 20, 2018, 3:30pm UTC](https://discuss.bluerobotics.com/t/hybrid-power-puzzle/3138/6 "2018-08-20T15:30:57Z")

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Thanks again for the input here. I am indeed planning to put higher voltage down the tether-- 120vdc, to be exact. By the time it gets to the vehicle with the tether I’m thinking of using it should be down to something like 80 volts, depending on the length. The 72-to-15 volt DC Vicor converter can handle a wide input voltage range, something like 100 to 50 volts, so that will work fine. It’s output can be adjusted up to 16.5v, which is why I was thinking I might be able to get a pair of matching, reasonably stable voltage sources at 16.5 if I didn’t fully charge the battery and used that other DC-DC converter. Current limiting would then be the problem… the Vicor 72-to-15 converter is strictly limited to 250 watts, and the other converter is limited to 30A on the input side, providing around 450 watts. Seems like we’re getting into more-trouble-than-it’s-worth territory here, and just doubling the battery capacity would be way easier.

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