DEBRIS.COMgood for a laugh, or possibly an aneurysm

The PV array had a good day yesterday: 2430 watts DC is 97.2% of the Sunnyboy inverter’s theoretical maximum of 2500 watts.

We were pumping 2100 watts of surplus power into the grid — a personal record, as far as I’ve seen. Note the minus sign in front of the 2.1 figure. “-2.1 kW” means 2100 watts of surplus power are leaving our premises and feeding the neighborhood grid.

The inverter’s max output of 2500 watts can only be achieved with a specific combination of conditions:

• the sun must be directly overhead, so that the panels are perpendicular to the sun’s rays
• the panels must be clean
• the ambient temperature must be cool, because heat affects panel efficiency