Also ... in case you started doing the math of how much power you will
need and possible upgrades of your electrical system, and are
attempting to convert that 2kw or 4kw into amp hour draw on your
battery, hold up.

Also ... note that 4kw radomes such as Raymarine's only use 38 watts of
battery power while active, and 10 watts in standby. The transmitter is
in the "off" cycle of each pulse, for most of each second. Since all
the electronics in the radome are on all the entire time, the
chartplotter of course is on all the time, the total power consumption
between a 2kw and 4kw system is negligable.