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Old 07-26-2020, 07:56 PM   #4
lwmcguire
Senior Member
 
Brand: Thor Motor Coach
State: Missouri
Posts: 2,324
THOR #6903
BIRD vs BIM

Which is the same design just a different Manufacturer. The parameters are almost identical. BUT, there is one thing that makes changing from the old Intellitec BIRD to the BIM a good idea. The BIM monitors the actual Chassis battery voltage and IF that voltage drops to 80% of charge, the BIM connects the coach back to the chassis to allow the coach Charging system to keep the chassis battery up. The BIRD system does not do that. It monitors the Coach Charge system voltage and must be over 13.1 volts to keep the chassis connected. Replacing the BIRD with a BIM is very simple. You just replace the BIG BOY solenoid and the supplied BIM module and all wiring is already at the old system. Precision Circuits which makes the BIM, he is a old Intellitec (BIRD maker) engineer that quit and started PCI, and used his knowledge to make RV electrical systems BETTER. For instance, the 50 amp EMS systems by Intellitec that were all used before PCI came out, IF it malfunctioned all shed loads were dead, no 120 to those loads. He designed the PCI system to keep the relays CLOSED if his system failed and that left all 120 shed controlled loads still able to have power and you manually adjusted your loads until fixed. He has done the same with his BIM. Made it better by monitoring the chassis battery state of charge instead of relying on the coach charge voltage.

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