pgtruspace's blog

about things that interest me.

Solar power project

40 Solar Photo Voltaic panels, over 8 thousand watts, 8Kw of panels mounted for maximum winter power production. The winter angle, 42 degrees, also aids with snow shedding, half hour of sun will clear the panels.

40 – 200 watt Sanyo/Panasonic panels mounted like shingles to create a water shedding roof over the wood frame structure and cover the electrical system and batteries. The next step is to upgrade the battery system to provide up to 35 – 48Kwh of batteries to supply 5 days of power to the farm grid. Then Inverters to turn the 48vdc from the battery bank into 240/120 split phase power needed to run the water pump and other 240/120 loads. Presently the panels are directly connected to a 36vdc bussed battery and grid-tie system that pumps 2Kw back into the local grid. While better then nothing this is very a inefficient coupling that wastes over half of the power harvested and will produce nothing if the grid is down.

Back of rack shingled with copper clad thin FRP

only 30 minuets of sunlight cleared the snow from the rack.

8 Kw of Photovoltaic: this link should load a new window with more construction details

2 responses to “Solar power project

  1. The True Nolan January 18, 2022 at 6:33 pm

    Very nicely done! The truck peeking out of the back shows the scale of it. I like the shingling of the panels; good idea! I may be doing something similar at my off-grid place. So far, I have just done a small roof mounted set of panels (400 watts — makes me feel, uh, inadequate when I see your 8000W!) but need to clear more trees and brush before I decide where to put a bigger system.

  2. p.g.sharrow January 19, 2022 at 12:32 pm

    @The True Nolan, I hope your array is usable for you. Mine is mostly just show for now. building out of your pocket is slow an painful. I need lots of batteries next as well as a power management system, Expensive! stuff. Right now a bunch of the panels are tied directly to the buss with enough batteries to drag the panel 58 vdc down to 36-40vdc that is required to drive a handful of old grid-tie inverters that are also tied to the buss. About 2Kw to the grid is the best we can do right now.
    We had an opportunity to buy 50 panels at a total cost of $2,500 but they sat in a pile for 2 years before we acquired enough materials to build the rack to mount them on. Every time Public Graft and Extortion, slams us with an increased bill we cringe, How do you pay for the power AND build a system to reduce that bill? Only rich people with large incomes can afford the givernment programs that we all pay
    for.

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