Connecting solar panels in series to get 144v will work, but shading on any of the panels will degrade the output of the whole series string. I have a friend who built a systems that charges at 12v and drives the boat at 48v. Afterwards, he's not convinced it's better than a DC/DC converter, but the idea was for charging in parallel and propulsion in series for higher efficiency during both.
Didn't the original post mention a big 12v bank that was electrically connected to the traction bank? I'm not familiar with DC/DC converters, but if you charged the 12v, would the converter charge the traction bank?
Damon
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