I have to say that last night I just didn't see how really a complicated question that is. But this morning I was sitting outside having coffee and was thinking about this question and I have come up with a couple of things if nothing else will give all of us something to think about.
The rechargeable lights all have one thing in common,Batteries. The question the becomes what's the best way to charge then? Solar certainly is an option but is it THE option? Well it could certainly help but at what cost in dollars and work and efficiency?
This is the least expensive system I found at Northern Tool and it comes in at 2800 dollars.
http://www.northerntool.com/shop/tools/product_200350822_200350822 I just don't think that it's worth that kind on money to put out enough power to run 36 one hundred watt light bulbs.
I think you would be better served if charging batteries is the end game to invest in battery chargers and converters to power up you systems when you don't want to run generators.
We know you have to buy enough batteries to do what you want so the cost of those is a constant and if lighting is what you're after the you either have to run 12 volt lights or 120 volt lights. If 12 volt is what you want then we know that you can get self charging solar light and are readily available.If 120 volt lights which you probably already have are what you want to run then you could go with an Inverter set up for a hell of a lot less that that solar system IE:
http://www.northerntool.com/shop/tools/product_200347895_200347895Which gives you the ability to run 25 100 watt bulbs for a fraction of the cost.
Since you will be running generators for at least part of the day why not invest in battery chargers that you can run off a generator and charge every battery all at once off the same generator that's running anyway and use solar battery maintenance panel just to keep the unused batteries up to full charge here again for a fraction of the cost:
http://www.northerntool.com/shop/tools/product_200422047_200422047 And this unit will also slow charge batteries in a pinch or used to top off batteries.
Just some food for thought and hopefully discussion. I'm not playing expert because lord knows I'm NOT but when you guys comment I learn a little more every time. So I'm looking for advice more than giving advice.And one of my goals is to try and keep costs to where almost anybody can do it.
So I'll be waiting with great interest.