herrakonna
New Member
I am upgrading my CBE DS300 based system with a Renogy dual input DC/DC + MPPT charger controller and replacing my CBE CB510 AC charger with a 20A smart lithium charger.
I have studied the DS300 manual closely and have done a fair bit of googling and reading about integrating a DC/DC (B2B) charger to DS300 based systems, and think I have gleaned a sufficient understanding of how the DS300 works and what must be done to integrate the new components, but am still unsure about the ultimate correctness of my planned modifications of and connections to the DS300.
My goal is to remove entirely all charging related behavior from the DS300, both charging the leisure battery from the alternator or AC charger as well as trickle charging the starting battery from the AC charger. However, I want to retain as much of the existing stock behavior of the DS300, e.g. relating to step retraction, 3-way fridge control, display of starter battery voltage in the panel, etc.
My understanding is that if resistor R37 is removed, the parallel battery relay will be disabled and the starter battery and leisure battery bank will never be connected in parallel. In addition, if the AC charger signal "S" connection is never connected, the DS300 will never attempt to trickle charge the starter battery.
In order to ensure that the new charger controller will be able to accurately monitor the voltage of the starter battery without being affected by the DS300 in any way, I intend to install a 50A DC blocking diode, which should block all current from the DS300 towards the charger controller while still allowing the DS300 to sense and display the voltage of the starter battery.
In order to ensure that the DS300 does not attempt to charge the leisure battery from the alternator input, I will install an inline 1A blade fuse. If the parallel battery relay truly is reliably disabled, there should never be any significant current being pulled from the starter battery / alternator by the DS300 so the fuse should always remain entact.
The ignition signal connection will be left connected as it is now, so that the DS300 knows when the engine is running.
With the above modifications and connections, the DS300 functions affected by when the engine is started/running, e.g. controlling the step retraction, fridge switchover, etc. should continue to function as before.
Here is a diagram of my planned upgrade:
Am I misunderstanding or missing something, such that the above configuration will not achieve my goals? Any suggestions how better to meet my goals?
Thanks.
I have studied the DS300 manual closely and have done a fair bit of googling and reading about integrating a DC/DC (B2B) charger to DS300 based systems, and think I have gleaned a sufficient understanding of how the DS300 works and what must be done to integrate the new components, but am still unsure about the ultimate correctness of my planned modifications of and connections to the DS300.
My goal is to remove entirely all charging related behavior from the DS300, both charging the leisure battery from the alternator or AC charger as well as trickle charging the starting battery from the AC charger. However, I want to retain as much of the existing stock behavior of the DS300, e.g. relating to step retraction, 3-way fridge control, display of starter battery voltage in the panel, etc.
My understanding is that if resistor R37 is removed, the parallel battery relay will be disabled and the starter battery and leisure battery bank will never be connected in parallel. In addition, if the AC charger signal "S" connection is never connected, the DS300 will never attempt to trickle charge the starter battery.
In order to ensure that the new charger controller will be able to accurately monitor the voltage of the starter battery without being affected by the DS300 in any way, I intend to install a 50A DC blocking diode, which should block all current from the DS300 towards the charger controller while still allowing the DS300 to sense and display the voltage of the starter battery.
In order to ensure that the DS300 does not attempt to charge the leisure battery from the alternator input, I will install an inline 1A blade fuse. If the parallel battery relay truly is reliably disabled, there should never be any significant current being pulled from the starter battery / alternator by the DS300 so the fuse should always remain entact.
The ignition signal connection will be left connected as it is now, so that the DS300 knows when the engine is running.
With the above modifications and connections, the DS300 functions affected by when the engine is started/running, e.g. controlling the step retraction, fridge switchover, etc. should continue to function as before.
Here is a diagram of my planned upgrade:
Am I misunderstanding or missing something, such that the above configuration will not achieve my goals? Any suggestions how better to meet my goals?
Thanks.
