You can take a piece of paper and make two columns on it, one for turbiner and one for solar. Then right down the kWh (or amp-hours, it doesn't make any difference) under each one, depending on what you got the Doc Wattson hooked to, each time before you reset it. Then add the columns up at the end of the month.
The only problem with this is that the solar panels might be putting out power while you got the Doc on the turbiner, or the turbiner could start up and run while the Doc is on the solar. So you would not get all the power logged because you can only log one at a time.
You could parallel the outputs of the solar and wind turbine and run them both thru the Doc Wattson simultaneously. Then you'd never have to disconnect it and it would retain the logged data. That won't tell you which one was which, but it would tell you how much total kWh you generated for the month.
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Chris