How important is have the flexibility to adjust for summer and winter? Any help will be great!!
Well, it's an odd one to quantify.
Lets assume you have your panels optimised for output in winter - when presumably you need the power most. I'll use figures where I am - the variation should be close to the same wherever you are though.
Mid winter, the sun only gets up to 30 deg above the horizon here, so if the panels are square on that, in summer the sun will be 77 deg above the horizon, so the off-angle error is 47 degrees, so you are down to just 68% output. (32% "wasted" potential). Thats a lot of lost power in a summer when you have so much potential power generation.
If you aim the panels for mid-way, you'll be 23.5 degrees off-line in mid-summer and mid-winter - only 8% or so, so the total wasted potential is less - but you do miss a fair bit of usable power in winter (and summer).
Is it worth moving the panels to maintain output all year 'round? Well, I guess thats your dilema. The extra cost and complexity of your array vs your peak power and average power returns. For my money, it was worth the effort - but you get much greater returns by tracking east/west.
Combining east/west daily tracking with elevation for time-of-year gives the best return from your PV dollar, although you can go one more step with MPPT controller and running your panels at their optimum point all day, all year.
My observed results here is that compared to fixed panels directly charging a battery, I get about:
* 10% more watt-hours over a year with an elevation-adjusted array
* 40% more watt-hours per array that tracks east-west
* 30% more watt-hours per day using MPPT
Interestingly, several of these are cumulative. MPPT + east-west tracking gives me close to 30% more power for 40% more time, so around 82% more watt-hours per day than fixed panels without MPPT.
