Need help sizing solar panel

shouldnt he use low power CF Bulbs ?
why 100 watts ?

my bulbs are about 10 watts each,

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Hello Jimmy welcome to the group
Here in Nebraska, we use windmills to pump water to a holding tank.
Depending on your wind, that might help reduce your power needs/consumption
and also give a nice nostalgic look to the waterfall.
You could use a float switch on the tank to turn on the pump when wind is
not enough.
Depending on the property size, you might need a good sized windmill to make
1000 GPH though.
Led lights or compact fluorescents work great and you can do that part but
as these fine gentlemen have pointed out, the power grid is usually cheaper
to run big pumps.
This can be an expensive hobby, but I love it.
Best wishes to ya
Randy

Well George did the same maths that I did - and we both came to
basically the same answer (without knowing all the details).

Most people have no idea just how much power it takes to run "two
light bulbs" 24/7.
If you mean 100 w light bulbs (approx) its nearly 5kwh.
Except for water heating (wood powered at this time of the year in
NZ), I only use 5kwh a day for my whole house.
Like George says, thats something like a 1.5kw array.

The sun may shine for "7 hours" but it isn't overhead all that time,
and there are cloudy days etc.

The amount of energy you could recapture with a water wheel would
probably not be worth the extra expense.

Its clear that you have grid power.
It would be foolish to run a garden pond pump on solar in that case -
unless there were compelling reasons to do so (and the power
requirement was quite low).

You statement that you "need" to pump 1000gph, is more likely that you
"want" to pump a 1000gph.

Regards

Eric Sears