Open Source PV System

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December 2017 - Completion Walk-Through

  • After testing various loads including internet, lighting, washer, dryer, hydronic pumping, water pumping, macerator lift pump, computers, refrigerator, freezer, vaccuum cleaner, microwave oven, cutoff saw and power tools, and other various appliances - the working system is this:

See also final system diagram.

Cost of Electricity Production

  • Assume 6 hours of sun and 20 year lifetime for the 3 kW array
  • Cost total was $1800 for the panels, $3K for balance of system.
  • Take 20 years * 3kW -> 131,000 kwhrs.
  • For $3000, we get 131,000 kwhrs, or a cost of 2.3 cents per kWhr.
  • If we consider only the racking for the roof - that cost was $300, or $2100 system cost. That is 1.6 cents per kWhr
  • If extend to 50 year life with double the electricity, decreasing 1% per year - we get down to 0.8 cents per kWhr. This is close to free.

Sahara Case

  • If we are in the Sahara, it is 8.5 hrs of sun instead of 6 ,lowering cost to 1.1 cents per kwhr
  • Lifetime is 80% of initial power at 20 years, so on average it is 90% of rated value. So really 1.2 cents per kWhr in the sahara. But, that means we have 30 more years practically - between 80-50%, or 65% on average. Therefore, another 181000 kWhr - so price goes down to about 0.5 cents per kwhr over a 50 year life.
  • Thus, the practical cost in Maysville could be 0.8 cents per kWhr over a lifetime. Much less than coal or nuclear.

Hydrogen Production

  • Hydrogen production takes 41 kWhr/kg (by what method?). Hydrogen energy equivalence is 1 kg hydrogen to 1 gallon gasoline equivalent when burned in internal combustion engines.
  • The cost of hydrogen production is $4 per kg if we consider 10 cent per kwhr standard costs of commercial PV energy. But, it is 40 cents per gallon equivalent if we use open source photovoltaics like in our Seed Eco-Home.
  • This means that we need data right now - on a full system from PV to hydrogen engines.
  • Can start with industrial hydrogen bought off the shelf, with multifuel test engines via the Engine Construction Set.

BOM

  • 24-12 step down - [1]
  • 240V-24V charger - from doggy line backup line - [2]

Seed Eco-Home

Working Documents

Final

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Initial

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Note: shipping for $1300 worth of panels (3kW) was $500 for $1800 total. $0.43 per watt solar panels, and price continues to drop.

CAD

Cabinet:

  • Width: 40.25"
  • Height: 48"
  • Depth: 17.5"

Electrical Panel

Initial Testing 2016

FB Post

Electrical Plan - Seed Eco-Home

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Faculty House 2015

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BOM

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Inverter

  • Fuse - glass, 250V,F25AL - 6mmx30mm - [100 Pcs Glass Fuses 25A 250V 6mm x 30mm Fast Blow Skywalking]

Lighting

Data

Industry Standards for a 3kW Off-Grid PV System

Not Installed

  • $13k - [3]
  • 3000W kit for sale with batteries and inverter. No racking/mounting. - $8200 - [4]
  • 3kW kit - panels + power center. No bats or racking/mounting. - $9100 - [5]
  • $8k without batteries - [6]
  • 2.4kW, no racking/mounting, nickel-iron batteries - $13.4k

Installed

  • 3000W - $14k - [7]
  • 3000W $18k - [8]

Not Off-Grid

  • $9-11k typical for 3kW fully installed - [9]

Links