I hope there is something more to this than a busbar and battery taps to control voltage. Unless you're talking about a low power installation, the arcing when making and breaking connections would be impressive.
Perhaps you are referring to a system that uses contactors to switch various combinations of batteries in series/parallel.
I expect that you would find that the cost of suitable contactors and the extensive wiring would be a big percentage of just buying a spare controller and mounting it adjacent to the one in normal operation. If the control circuitry harness and high-power cables are adequate length, I can imagine that the spare controller could be operational in in just a few minutes. Stow the tools required near the controller, and you're good to go.
Using less than optimal (wimpy) contactors would save money, but now your back-up system is unreliable or dangerous, or both.
I realize this thread is about NOT buying a controller, but that's
my 2 cents...
-Tom
--- In electricboats@yahoogroups.com, "inganear1" <inganear1@...> wrote:
>
> If I recall sometime ago someone in the group made a busbar type of arrangement to control voltage as a speed control for their system not using the normal electronic controller, or proposed anyway, can't remember exactly.. I would like to make such a system for a backup since I use 6 volt batteries in my 48 volt system on one of my boats. Can someone point me in that direction..
> Dave K
>
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