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In this video I describe step by step how to professionally build a safety system against fires, overloads and natural damage for photovoltaic systems. The box includes a safety switch and surge arresters against overvoltages due to atmospheric discharges such as lightning, etc. To find detailed descriptions and prices of the items covered in this video, I recommend using the following links: DC surge arrester: https://amzn.to/2WpotnI Circuit breaker to be sized according to your system: https://amzn.to/2HEdLl1 Electrical panel to be sized according to your needs: https://amzn.to/2YNzKM6 MPPT photovoltaic inverter and charge controller: https://amzn.to/2EAHnxE Cables for DC or CC direct current connections: https://amzn.to/2Mdmi2G 300W high-power and high-performance solar panel: https://amzn.to/2HBhBLQ