I am using this relay ( https://www.digikey.com/products/en?keywords=PB1121-ND ) to connect/disconnect a small (7W) solar charger. The charger is connected via the NC pins, so the relay is activated when the battery is fully charged, and released when charging is needed (or at night). In some relay spec sheets, I see warnings about leaving a relay energized for excessively long periods. I don’t know how long that would be. Are we talking about minutes, hours, days? In my application, it would never be energized for more than 8 hours at a time, and it would not be too difficult to interrupt it periodically if necessary. If interruptions are recommended, how often, and for how long?