--- In electricboats@
>
> What does the group think about replacing a controller with relays that reduce the voltage from 24 to 12 volts? What is the efficiency loss and what other problems would be expected? And could the same thing be done with a 48 volt system, reducing it to 36, 24 and 12? There must be some reason why older golf carts used resistors to reduce speed rather than reducing the voltage.
> Thank you
>
There is another basic approach that does not use a controller or relays. It is what I just removed from my 1991 Electracraft 16' launch. I consists of a high current Salzer multi-pole switch ( in my case a S432L) and a pair of what I think are thyristors that connect to the 36 volt permanent magnet motor. I have 3 pairs of 6 volt batteries. For the 3 available speeds you selected either one, two or three pairs. Obviously battery draw down is uneven. But, it worked reliably and efficiently for 18 years. With my variable speed controller and 36 vdc to 12 vdc converter for lights and accessories boating is better than ever.
Bill
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch format to Traditional
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe
No comments:
Post a Comment