![]() One reason people are sometimes advised to fit isolators in between panels and controllers is to allow them to work on the their 12 volt systems. Myth 2 - 'I need to isolate my panels to work on my 12 volt system' ![]() By leaving the panels permanently connected to the battery via the solar controller, the system can monitor your battery and keep it in the best condition. By disconnecting the panels from the battery using an isolator you are losing this 'float' function that your controller provides and your battery will slowly start to self-discharge. Given this, there is no risk of over-charging the battery and so no need to isolate the panel from the controller/battery. ![]() The solar controller will sense the state of charge of your battery and if the battery is fully charged, the controller will enter a lower voltage 'float' mode that prevents the battery from self-discharging and holds it at its maximum state of charge. Solar panels produce energy when exposed to sunlight and this energy is used by a PWM or MPPT solar charge controller to provide a suitable charging voltage to your battery. Myth 1 - 'Your battery will be over-charged if left permanently connected to the solar panel, so it needs to be isolated' These requests come off the back of several YouTube videos & guides saying these units are needed in a solar setup, but we wanted to break down the myths behind these switches and explain why they may do more harm than good. A product we get asked for a lot is 2-pole isolators for use with solar panels.
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