Did you mean the solar charge controller side? The regulator will be connected to the solar charge controller and the DVR and camera in the output of the regulator. Why 2.5A DVR and 6 cameras could draw about 3A
Well spotted. yes, the DVR has to work at night. We have set the load cutoff voltage on the change controller to 12.1v. But worked out and provided one 1-day extra capacity on the battery and I expect to work above 12.2 v on the battery. I still have to test the regulation to see how it will behave when the input( battery ) voltage goes down to 12.1 or 12.2 but not below 12.0v. I do not expect to work below 12v