I like this picture. The Port navigation light throws a soft glow through a cloud of cigar smoke. I sat in the boat in the dark and listened to music and enjoyed a cigar and a beer. It’s about the first time I could easily imagine being on the water.
February 22, 2010
February 21, 2010
I’m working on the 12 volt DC wiring design. The ACR (Automatic Charging Relay) makes the battery charging automatic. Either charging source (the 110 volt charger or the outboard motor charger) will charge both batteries, but will disconnect them as they’re being discharged. This way, I can safely draw down the house battery without taking the chance of draining the starting battery and not being able to start the engine. I’m still not sure what size wires to use, or if it’s best to have the starting battery under the pilothouse sole or in the stern next to the motor.
The Blue Sea ACR came with a wiring diagram, but I found it unclear. Adding the color-coding and additional detail helps me understand the design. The picture was drawn in Visio. The ‘Starting Isolation’ wire to the ACR will disconnect the house battery when the engine is being cranked to protect the house electronics from power surges caused by the motor starting.
I’ve got both batteries already, and am making the holders for them. The house battery is a Dyno 4D-size, with 180 amp-hours. It weighs about 114 pounds. It goes under the Port pilothouse sole. I had initially intended on using an 8D-size battery, but our power needs should be pretty low, just LED lighting and electronics. The starting battery is a generic deep-cycle starting battery. Outboards don’t take a lot of power to start.
The other task in progress is the dashboard. The frame is complete, and I added the steering wheel mount this afternoon. It’s heavily built because there’s a lot of stress on that area when you’re hanging onto the wheel in bad weather.
(Click the image for full-size)
Edit 2-21 – Here’s a new drawing, with the parts in a more real-life configuration. All the stuff below the switch is below the pilothouse sole. I think this layout clarifies the relationship between the batteries and the ACR.