kevindud333 Posted June 9, 2020 Report Share Posted June 9, 2020 Can install an aftermarket amp by connecting it straight to the cars battery? Quote Link to comment Share on other sites More sharing options...
plus 3 golfer Posted June 9, 2020 Report Share Posted June 9, 2020 7 hours ago, kevindud333 said: Can install an aftermarket amp by connecting it straight to the cars battery? You should not connect load “directly” across the battery terminals because the negative battery cable has a Battery Management System current sensor to measure current into an out of the battery. The BMS integrates this flow over time to estimate battery Ah losses for use in SOC estimation, charging algorithm, load shed programs and so forth. Thus, the amp positive can be connected to the battery terminal. But the amp ground should be connected to chassis ground not the negative terminal of the battery. So now when the DCDC converter is not supplying power to all connected load including charging the battery (like when turning ignition off and continue playing music), the BMS will know the current flowing out of the battery due to the amp. Quote Link to comment Share on other sites More sharing options...
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