Hey everyone! I'm diving into my first project for setting up a critical loads panel in a completely off-grid home, and I'd love to get your thoughts on it. My main goal is to disconnect the AC and dryer circuits when the battery level gets low, while ensuring that my fridge and lights stay powered on. I'm thinking of using one main panel (critical load center) feeding a sub panel for the heavier loads. My plan is to utilize the Victron BMV battery monitor with a programmable relay to control a contactor that would take the sub panel offline when necessary. Right now, the system is on the smaller side with a Schneider 4048, but I'm planning to upgrade to the XW 6848. Is there a better option than the Victron BMV, or does this sound solid? Also, any recommendations for a good contactor? Thanks for the help, everyone!
2 Answers
Have you considered using smart relays for controlling your devices individually? This gives you much finer control over energy consumption compared to bulk disconnection. It’s a bit more involved, but totally worth it.
From my experience, the ideal setup involves having different distribution boards for each power source type. Use an Automatic Transfer Switch (ATS) that has relay capabilities to manage which board gets power from your inverter or grid. Once you have that in place, you can control the ATS relay using your Victron system, such as a Cerbo, or integrate it with home automation systems like Home Assistant for added functionality.
That sounds interesting! I haven't looked into smart relays much yet. Can you drop a link or two so I can check them out?