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Houseboat Hot Water System
Designed by Mark Little
 
Hot Water System Nominal Design
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After looking at the initial block diagram and the requirements for the project, the preliminary design was settled on wit the diagram below. The bypass mechanism is not shown, but it is relatively easy to see that bridging across the current sensor and the relay contact, effectively bypasses the inverter control system.
The existing components of the hot water delivery system include the pump, the power board (with circuit breakers), inverter and gas Hot Water System. The current sensor, the DC Power relay and the control unit are the new components.

To develop the design, each of the new components will be selected or designed to meet the over project requirements. Perhaps the easiest component is the DC Power relay that is used to control the DC to the Inverter and is considered next.