loading
15Comments

Tell us about yourself!

Complete Your Profile
  • Evolution of a ring bender / ring roller machine

    Nicely done.. BTW guitar builders use a baby version of this idea to bend fret wire to match the radius of a guitar neck's fingerboard.

    View Instructable »
  • Arduino-controlled Dual Axis Solar tracker

    Nicely done! Simple but effective. BTW, A typo "This bearing then fits snuggly into the caser-cut base of the compartment." Laser-cut...?

    View Instructable »
  • colinmcc followed JordsWoodShop1 month ago
      • End Grain Cutting Board / Butcher Block
      • Queen Size Platform Bed
      • Drop-Down Out Feed Table
  • Turn Your Old 2.5'' Or 3.5'' Hard Drive Into Portable

    Google HDD toaster, these are boxes that look like a baby toaster, but you can just drop your bare HDD into the slot. They usually plug into the USB port and each (slot, some have more than one) appears as another drive. Some also act as stand alone HDD duplicators with a copy button on them.

    View Instructable »
  • colinmcc commented on bwitmer's instructable Solar PV tracker3 months ago
    Solar PV tracker

    I researched this some years ago and wrote a long article on the subject of fixed tilt angles. I've cut and pasted the most important conclusions and formulas below. Hope you all find it interesting and of use.................................................................................................................................Books and articles on solar energy often givethe advice that the tilt should be equal to your latitude, plus 15 degreesin winter, or minus 15 degrees in summer. It turns out that you can do betterthan this – about 4% better.Fixed or Adjustable?It is simplest to mount your solar panels at a fixed tilt and just leave them there. But because the sun is higher in the summer and lower in the winter, you can capture more energy during the whole year by a...see more »I researched this some years ago and wrote a long article on the subject of fixed tilt angles. I've cut and pasted the most important conclusions and formulas below. Hope you all find it interesting and of use.................................................................................................................................Books and articles on solar energy often givethe advice that the tilt should be equal to your latitude, plus 15 degreesin winter, or minus 15 degrees in summer. It turns out that you can do betterthan this – about 4% better.Fixed or Adjustable?It is simplest to mount your solar panels at a fixed tilt and just leave them there. But because the sun is higher in the summer and lower in the winter, you can capture more energy during the whole year by adjusting the tilt of the panels according to the season. The following table shows the effect of adjusting the angle, using a system at 40° latitude as an example. (The comparison would be a little different for different latitudes.) Each option is compared with the energy received by the best possible ‘Dual Axis‘ tracker that always keeps the panel pointed directly at the sun. Fixed Adj.2 seasons Adj. 4 seasons 2-axis tracker% of optimum 71.1% 75.2% 75.7% 100%In short, adjusting the tilt twice a year gives you a meaningful boost in energy. Adjusting four times a year produces only a little more, but could be important if you need to optimize production in spring and fall. If your solar panels will have a fixed tilt angle, and you want to get the most energy over the whole year, then this section is for you. A fixed angle is convenient, but note that there are some disadvantages. As mentioned above, you’ll get less power than if you adjusted the angle. Also, if you live where there is snow, adjusting the panels to a steeper angle in winter makes it more likely that they will shed snow. A panel covered in snow produces little or no power!For latitudes between 25° and 50°, use the latitude, times 0.76, plus 3.1 degrees.Adjusting the tilt twice a yearFormulas used: The best tilt angle for: Summer take the latitude, multiply by 0.93, minus 21 degrees. Winter take the latitude, multiply by 0.875, plus 19.2 degrees.The best dates on which to adjust and the angle from horizontal:Adjust to summer angle of 24.57° on March 3rdAdjust to winter angle of 62.075° on September 12thAdjusting the tilt four times a yearFormulas used: The best tilt angle for: Summer take the latitude, multiply by 0.92, and subtract 24.3 degrees. Spring and Autumn, take the latitude, multiply by 0.98, and subtract 2.3 degrees. Winter, take the latitude, multiply by 0.89, and add 24 degrees.The best dates on which to adjust and the angle from horizontal:Adjust to summer angle of 20.78°on April 18thAdjust to autumn angle of 45.72°on August 24thAdjust to winter angle of 19.61°on October 7thAdjust to spring angle of 45.72°on March 5th

    RickD72, I agree that the precision isn't warranted for this particular project, but I was actually replying to anjnugteren's question which specifically asked "Is there and equation to calculate the inclination i need to set the panel to for any given place on the world?"On my own tracker I have no problem setting it to 0.5 degs, using a digital inclinometer.

    View Instructable »
  • colinmcc commented on phagemeyer's instructable The $120 DIY 12v Solar Power System3 months ago
    The $120 DIY 12v Solar Power System

    Sorry to be pedantic, but a 'transformer' by definition converts AC volts to AC volts, when converting a DC voltage to another DC voltage you actually are using a 'DC voltage converter'. That's a neat converter you used, I might grab one to power a RiPi myself.

    View Instructable »
  • colinmcc commented on BaldEagle5556's instructable The Frugal Man's Solar Shed Project 3 months ago
    The Frugal Man's Solar Shed Project

    "I hooked them up in series - positive to positive (red cable) and negative to negative (black cable). This kept the voltage at 12V."Please change this, you hooked them up in parallel, NOT series. Series would be 24v.

    View Instructable »
  • colinmcc commented on IbniH's instructable Air-Lift Irrigation Using Solar Panel6 months ago
    Air-Lift Irrigation Using Solar Panel

    There is no server at our.windowfarms.org can you correct your link please. Thanks.

    But, thanks for the wikipedia link, I never knew about 'air lift pumps' before, now I'm a bit wiser!

    View Instructable »