With this battery back up option we will put in a sub panel off of your main electrical panel. We move the essential loads over to the sub panel. This would include 120 loads (meaning not your AC, heat pumps, or pool pumps). We install an automatic transfer switch to comply with the regulations of the utility company. In an outage the ATS islands off the sub panel and the system provides the microgrid with power. The essential loads will be fed by the panels and battery during the day and just the battery at night. Choosing the battery type and loads are something we discuss in the consultation.