Solar panel costing.xls



I have also been investigating purchasing a solar p.v. panels to free my house from the national grid. Using my electricity bill and using information on
I calculated that I could totally replace my electricity supply with 17 solar panel units each covering 8sqm. The cost is a whopping £102000 about ($204000). Ignoring interest that’s a 76 year payback period and the system only lasts 25 years.
Does any green initiative actually stack up on paper or is simply a costly gesture?

Calculation Reference
Solar Energy
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The cost of installing a photovoltaic (PV) system to power your house can vary depending on several factors, including system size, location, and available incentives. Here's a summary of the main costs involved in installing a PV system:

  1. PV modules: The solar panels are the most significant part of the system cost. The price depends on the panel type, efficiency, and the total system size (measured in watts or kilowatts). The cost of solar panels has been declining over the years, making them more affordable for homeowners.

  2. Inverter: The inverter is responsible for converting the direct current (DC) produced by the solar panels into alternating current (AC) for use in your home. The cost of an inverter depends on its efficiency, type (central, string, or microinverter), and capacity.

  3. Mounting hardware and balance of system (BOS) components: This includes the racking system to mount the panels, wiring, connectors, junction boxes, grounding equipment, and other necessary components. The cost of these items depends on the system size and the specific hardware required for your installation.

  4. Labor and installation: The cost of labor for installation can vary based on the complexity of the project, roof type, and local labor rates. Some installations may require additional work, such as roof reinforcement or electrical upgrades, which can increase labor costs.

  5. Permits and inspections: Depending on your location, you may need to obtain permits and pay for inspections to ensure your PV system complies with local building codes and regulations. The cost of permits and inspections can vary by jurisdiction.

  6. Battery storage (optional): If you choose to include a battery storage system for energy backup or to store excess solar energy, this will add to the overall cost of your PV system. The cost of battery storage depends on the battery type (e.g., lead-acid, lithium-ion) and capacity.

  7. Maintenance: While PV systems generally require minimal maintenance, occasional expenses may arise, such as cleaning the panels or replacing components like the inverter or batteries over the system's lifespan.

To get a better idea of the total cost for your specific situation, you can obtain quotes from local solar installers or use online tools to estimate the cost of a PV system for your home. Keep in mind that there may be local, state, or federal incentives, such as tax credits or rebates, that can help offset the initial cost of installing a solar system.

14 Aug 2008
Last Modified
25 Apr 2023
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John Doyle

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Comments: 6
JohnDoyle[Admin] 15 years ago
Nice try Boffin - but I have no rivers running through my garden. The concept looks promising though (I wonder how much an old mill would cost?).
JohnDoyle[Admin] 15 years ago
Does your property have a water course crossing it, a stream or river. Do you own an old water mill? Water turbines/ hydroelectric turbines are the ideal method to provide reliable renewable energy on a long term basis. The available power at your proposed site is simple to calculate using this equation:Power (watts) = Head (m) x Flow (litres/sec) x 9.81 (gravitational constant ‘g’)A typical efficiency of water to wire is around 70%, you should therefore multiply the result by 0.7 giving the actual amount of electricity that you could expect from your proposed hydro site. Looking at your power consumption in
JohnDoyle[Admin] 15 years ago
In response to brab's comment - I am picking up the impression that larger scale projects might well be feasible but when I look into home grown solutions they just don't seem to stack up which stifles you enthusiasm to do anything. I am interested in quinetic's comment on ground source heat pumps. Even though you need provide power to the heat pump I think there is something like a 3:1 return in the form of heat.
JohnDoyle[Admin] 15 years ago
I have not worked up a calculation but I think most of the information can be found Please upload the calculation to the site if you manage to get round to it quinetic.
JohnDoyle[Admin] 15 years ago
Has anyone got a break even analysis of ground source heat pump home heating?
JohnDoyle[Admin] 15 years ago
The wind turbines mentioned in the latest ExcelCalc post were small roof mounted turbines but what about the large turbined that can be placed on top of large buildings or mountains or in the open plains as in the US and promoted recently by T. Boone Pickens and does Mr. Pickens have an interest in those companies or are his motives altruistic?:unsure: