Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22 Page 23 Page 24 Page 25 Page 26 Page 27 Page 28 Page 29 Page 30 Page 31 Page 32 Page 33 Page 34 Page 35 Page 36 Page 37 Page 38 Page 39 Page 40 Page 41 Page 42 Page 43 Page 44 Page 45 Page 46 Page 47 Page 4824 JANUARY/FEBRUARY 2017 • FOGHORN typically 500-900Vdc, depending on the specific system load requirements. DC/DC CONVERTER The propulsion rectifier requires a minimum and maximum voltage to operate properly. As the battery is discharged, the battery voltage will typically drop below the minimum voltage for the rectifier. For this reason, a DC/DC converter acts as a buffer between the battery DC bus and the system DC bus. Energy to/from each battery bank is controlled by this converter (interfaced to the Battery Monitoring System). BATTERY MANAGEMENT SYSTEM (BMS) Each battery cell, module, and string is monitored and controlled by the BMS. Monitoring includes voltage, current, temperature, state of charge (SOC), and health of the battery. Control functions include charge TECHNOLOGY rate, discharge rate, cell and module balancing, and string isolation (each series string of modules can be isolated automatically by the BMS should an abnormal condition occur). The BMS also provides over and under voltage protection, as well as over current pro- tection. SAFETY, RELIABILITY & SUSTAINABILITY The Rectifier, DC/DC Converter, Propulsion Inverter, and Ship Service Inverter should all use common com- ponents for increased reliability, ease of maintenance, and reduced cost for spares. This includes the main power components and the control cards/ modules. The only moving part in the system is the rotor of the propulsion motors and a few small cooling fans or pumps, significantly increasing the reliability of the vessel. Overall efficiency of the system should be 85-90%, compared to 35-40% for a typical diesel installation. Steering of the vessel should be controlled by electric motor driven actuators, not hydraulic pumps (which are extremely inefficient). This results in a significantly reduced load on the electric plant and eliminates hydraulic oil from the vessel, another mainte- nance burden and a potential source of pollution. For a typical twin 600HP propul- sion plant, this system will eliminate 500-1000 tons of greenhouse gases per year (depending on the operating profile of the vessel). The removal of fuel oil from the vessel eliminates is a potential major source of water pollution via a fuel oil spill. Fire protection in each Power Module can be provided by a small clean agent system that is safe for personnel and the environment, with a low global warming potential (GWP) and zero ozone depletion potential (ODP). ENERGY REQUIRED FOR THE VESSEL In determining the actual energy used during a typical day, monitor- ing the torque and RPM of the engine output shafts would be the first choice to eliminate any engine variables from EASY MANEUVERABILITY Give your passengers a smooth ride with reliable John Deere PowerTech™ propulsion and generator drive engines. With high torque and low-rated rpm, they deliver excellent vessel control and quiet operation. For easy navigation on the water — Nothing Runs Like A Deere™. JohnDeere.com/marine 60 to 559 kW (80 to 750 hp) 2017 Maintenance Management System Cloud Based - Access from any Device with any browser Maintenance - Inventory - Documentation Intuitive User Interface Safety & Drill Integration Turnkey Setup Contact us to meet at: w w w . W h e e l H o u s e T e c h . c o m - 9 7 8 - 5 6 2 - 5 2 1 1