BMG “Setup” Mode on Scotty AI Tuning Page The User sets the BMG operating parameters on the “tuning page” of the Scotty AI App. Pay Attention to this step or you won’t see any power! 1. Set the maximum charge voltage 2. Set the max Charge Current that the batteries will take and this is also the maximum you are setting for the BMG. When commissioning the first time, set this at about half the final number you will use. This is t be sure the belt tension, position is all running smoothly before you “Crank Up” the power. 3. Set the Float Voltage of the Lithium bank 4. Lithium batteries have a cell balancing time or absoption time, set that in seconds. Raely is it more than 2 hours. We typically use 1 hour = 3600 seconds. 5. BMG rpm0 is the RPM speed of the BMG that you want the power to start at. This NOT the engine speed. Typical pulley ratios are close to 3:1 so set a number 3 x the engne idle speed. 6. BMGrpm1 is the top BMG speed you set for maximum power 7. BMGCur0 is the current you set at the minimum BMGrpm0 speed. Power is Current x Voltage. 8. BMGCur1 is the current you set at the maximum BMGrpm1 speed. Power is Current x Voltage. Scotty AI then ramps the BMG power between these two settings in a smooth and progressive way. Not Getting the Right Power you expect? There is a lot happening behind the scenes with Scotty AI and the BMG. We have created a simple and easy way to determine what the issue is if not getting enough power. On the App home page under “BMG Status” are two calculations of Current: 1. RPM Current Limit is Scotty AI’s assessment of the max current possible considering the RPM speed of the BMG. This is the absolute maximum that COULD be delivered right now! 2. The Target Cur is the maximum calculated current possible because of sensor values and the battery SOC%. If this number is less than 1. Above then there are reasons other than max performance holding the BMG back. It could be any of these reasons: • Battery State of Charge is high and battery charge acceptance rate is low • Inverter temperature is high (Shown on BMG Status page). This will operate up to around 140C. But Scotty AI will start to derate performance at 120C after a timer starts.
• Motor temperature is high (Shown on BMG Status page). This will operate up to around 140C. But Scotty AI will start to derate performance at 120C after a timer starts • Belt is slipping (you will hear it. When this happens the BMG stops, waits about 5mins and restarts.
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