AGL Tesla battery installed June 2020. Until recently if a mains outage occured the battery backup occurred seamlessly, we were only made aware of the outage by heavy usage appliances, e.g. electric oven, turning off. In the last few months there has been a period of around 5 seconds from mains outage occurring where all power is cut until the battery again provides backup. This is occuring regardless of the level of charge in the battery, and occurs even when the battery is already providing 10 ...