E001 is the code of "Over Load Protection", please let us know the power of the device connected to the output port before. . Learn how to troubleshoot and resolve the Sonnen E002 battery overtemperature issue effectively. •What causes a battery to overheat? Battery overheating can occur due to excessive charging, environmental conditions, or internal faults. E003 is the code of "AC&DC output run simultaneously,system. . When we hooked up this system we screwed up, and got an E2 message from the charge controller. Now we have all the loads disconnected and cannot get the error message to go away and it will n ot send any voltage from the panels to the batteries, How do I ( clear the error message? It may help to. . Understanding solar inverter error codes is crucial because they provide specific indications of issues that might be affecting your system's performance. This document serves as a supplement to the following versions of the. . Measure the insulation resistance using a megohmmeter positioned in the photovoltaic field (positive terminal short-circuited at the negative pole) compared to ground.