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dr.don 300W per day doesn't really make sense. Watts are already units of POWER (rate of energy usage or delivery), so there is no element of time in Watts (the "per day part). ENERGY can be measured in Watt-Hours, but there's a problem there, too. In full sun, there is never a moment this panel will provide 100 Watts. To determine how many Watts (power) the panels are providing at any moment, simultaneously measure the voltage and current and multiply. 22V X 0.75 Amps is 16.5 Watts. multiply the power by the number of hours the panels collect 16.5 Watts, and you have the quantity of energy collected. Some of that energy is lost heating the batteries and charge controller (as well as during battery usage), so even if you store 16.5 Watts for 4 hours, you may only store 55 Watt hours of energy, and in use you might only recover 50 Watt hours of the stored energy. Energy is conserved, but doesn't always go where we want it to go.