Fixed vs adjustable tilt

[Naptown]

Does anyone know of a study that compares the production increase of an on grid system with fixed tilt vs adjustable tilt.
Actually need third party credible source.

[ckhorne]

I'm not sure if this is what you're looking for, but it may be useful if you haven't already seen it: http://www.macslab.com/optsolar.html

[Sunking]

Rich you do not need any study to answer your question. You already know a 2 or 4 position tilt rack will optimize solar harvest vs the time of year. You can make one that works on the same principle as your oven rack. A slotted piece of uni-strut give you any ideas?

[Naptown]

Rich you do not need any study to answer your question. You already know a 2 or 4 position tilt rack will optimize solar harvest vs the time of year. You can make one that works on the same principle as your oven rack. A slotted piece of uni-strut give you any ideas?

Yes I know that and and also know that it will increase harvest by about 4-5%.
However This is for an 18KW install. A piece of unistrut aint gonna cut it.
Typical ground mounts for us are Snap N Rack or Schletter.
He wants pole mounted 14 modules per pole. In DPW that is landscape 2 wide x 7 tall. got any idea how tall that will stand?
Racking costs just about doubled Using DPW top of pole mounts.
A competitor is pitching the pole mounts. I have a feeling he told them it would increase their harvest as a tracker would do. (these are not tracking mounts)
Just trying to get to the bottom of the objection regarding how they look as it was transmitted to me.
FYI this will be about 250' from the house and down a slight hill. you can see the back of the array from the house.
Reason I wanted an independent verification is so it is not coming from my mouth but a third party verifiable and legitimate source.
I run into a lot of people here and the horror stories of how some of these companies are overstating required array size, grossly overstating savings etc is really P***ing me off.

[bonaire]

Could you run three pvwatts calculations for each of the DPW adjustment angles to compare that with a fixed array? I almost went with a DPW for half my array but the added costs weren't worth it for payback. The fixed Schletter mount at 35* seems fine. Are they saying that a one horizontal axis like DPW will match a tracker? It won't but it also would cost less than a tracker. If they want more production, they should just get more modules. Two more fixed mount modules may match the added production annually that a DPW tilt would give them. We have a lot of clouds around here so it's not going to buy them much. They need to engineer for payback and not production. Lowest cost per watt comes with larger, simpler arrays, right?

I didn't even add monitoring to my setup to save on per watt costs. Saved .20/watt based on what the installer wanted to charge. I'll just add it later on my own.