Wednesday, June 3, 2009

Re: [Electric Boats] Re: Boats over 30'



merrick white wrote:
>
> I am not sure what you mean by saying the the 2000i will only slow charge one 12v battery at a time?
>
>
Assuming the feature set is the same across all regions (I'm in
Australia), there is a 12v unregulated output on the Honda 2000i that
can be used to charge a 12v battery.
Looking at the block/circuit diagram in my EU20i manual, the 12v comes
straight off an auxiliary coil, goes through a bridge rectifier and then
to the DC socket. There is no voltage sensor back to the ECU, they
obviously just 'know' if they run at a certain speed, the auxiliary coil
produces something near 12v.

While my diagram is the 230v unit, I don't expect the 120v version is
significantly different in operation - at half the voltage the current
has to be twice as much on the AC side, so the US version probably has
thicker wires and chunkier over current protection, but the basic
engineering and build of the unit would be the same. (Except for the
output voltage and the socket, the 2000i looks the same as my EU20i!)

Since there is no control or feedback on the '12v' output at all, it
looks like it would be really easy to 'cook' your 12v battery if you
were not careful, and certainly don't plug something like your 13.8v
powered radio transceiver into it!

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