I am having a raymarine 2Kw radar system installed together with the raymarine C70 chartplotter and GPS receiver on our Hunter 356. In a "typical" installation is the radar dome power supply different from the power supply to the chartplotter and GPS or is it one common supply. I think that on most days I would want to use the GPS and chartplotter but would only need the radar during reduced visability. I am not sure that I need the extra load on the house batteries when sailing in good weather.