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I have never measured more than 30 watts. The greatest voltage was 14.5 and the highest current was 1.9 amps. If Watts = Volts * Amps or in this case 14.5 * 1.9 = 27.6 Watts. This reading was obtained 12:30 PM on June 20, 2011. Though many other readings were close, this was the highest seen during 2011.
NOTE: Current was kept flowing to the battery bank as long as additional load was added to keep the Charge Controller Cuttoff Voltage at 14.5 or below. The current flow being measured included that consumed by the battery plus the additional load. I switch often between 5 different HF VOM's with no noticeable difference in voltages or amperages.
I would like to hear how others have read wattages at higher levels
Thanks for any comments