>> OK. All good answers. Here's some more questions that
>> I thought of since this morning:
>> 1. In reference to the rooftop + solar systems, what's the
>> specs of the solar panels? In other words, I'm looking for
>> the data that I need in order to fill out that portion of my
>> RoI calculation.
Depends, the standard 2 panel kit is 150 watts. The current upgraded panels I am shipping are 234 watts as a free upgrade available now as a sale. That actually makes it a 934 watt kit or same price. I am giving the upgraded panels away at same price to stimulate sales right now.
>> 2. The multi-turbine rooftop systems show 850W turbines,
>> why the small "step" up from the 750W turbines for the
>> single-turbine system? Are there other wattage options
>> as well? Can you post a performance curve for the 850W
>> model like you have for the 750W model?
There is no 750 watt, it's a 700 watt, there is no 850 watt turbine, that's a 700 watt turbine with 150 watts of solar added.
>> 3. since batteries are not included in the price of the system,
>> they need to go into a RoI calc., too. Do you sell them? If
>> not, where do you recommend buying them? How many
>> do I need?
You can do 4, 8, or 12. I recommend atleast 8. You can buy them at Sam's club or anywhere Golf Cart batteries are sold. BUT, I recommend the U2200 from Interstate for better warranty and standardization. It's 6v 200 to 220 Ah Golf Cart battery. Cost from $71 at Sam's to maybe $115ea. if you don't shop and negotiate well.
>> 4. What's the life expectancy of a battery? 3 years? 5, 10,
>> 20, 30? Automotive batteries seem to take a dump every 6
>> or so years in Ohio weather, but my familiarity with 12V
>> systems (automotive) was quelled in relation to energy
>> systems in the last post...
These batteries will not go out like a car battery because they are not left out in such harsh conditions. But of course mileage will vary with your battery type, and each battery will vary. I would say they will (normally) last atleast 6 and then will require random periodic replacement. They can last a long time but will go out sporadically here and there with weak cells etc. After 6 years I would do a beattery check quarterly as maintenance, checking for weak cells.