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.