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The Water Cooler
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Are solar panels worth the investment?
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<blockquote data-quote="-Pjackso" data-source="post: 3623235" data-attributes="member: 8119"><p>Trees, shade, weather-factor (clouds), effective day-light hours - all effect PV output and change depending on time of year.</p><p>(Best case: 8.0 effective day-light hours in December, and 11.0 effective day-light hours in June)</p><p></p><p>Without being a math wizard and doing calculations - you need real outputs based on other local installed systems.</p><p>Ask your contractor for similar sized systems and the real KWh monthly outputs. Ask for 2-3 years of outputs, as KWh output changes considerably over the months/seasons. Calculate the annual average KWh/month and multiply by your electric rate. That'll be your average PV savings per month, then compare to the total costs and ROI.</p><p>If the 'other' system is a difference PV size - be sure to adjust the numbers accordingly.</p><p>...or reference the SunnyPortal for real-outputs (previously linked).</p><p></p><p></p><p>Other considerations:</p><p>The future costs? Consider that the cost of electricity will only go up in the future. </p><p>So a simple-ROI isn't the best approach. The real saving may be in 10 years when the KWh price is ...double?</p><p></p><p></p><p>How's your roof? </p><p>There's no point installing a PV system over a roof that's 3 years from being replaced.</p><p>It'll have to be completely removed for roof replacement, then re-installed. (insert: damaged?)</p><p>A standing-seam metal roof would be ideal, as standing seam don't have exposed fasteners and will last 50+ years.</p><p>Metal roofs with exposed fasteners are only good for 15-20 years, as the screws start getting loose and start slowly leaking.</p><p></p><p></p><p>Can you DIY?</p><p>If you can get the racking/panels and install yourself (no labor or bank loan) - then the ROI is about 5-6 years.</p><p>If you can DIY - then it's a crazy good deal.</p><p></p><p></p><p>For further reading:</p><p>[URL unfurl="true"]https://www.okshooters.com/threads/solar-panels-for-home-energy.180456/[/URL]</p><p></p><p>[URL unfurl="true"]https://www.okshooters.com/threads/solar-energy-system.157153/[/URL]</p><p></p><p>[URL unfurl="true"]https://www.okshooters.com/threads/solar-systems.121164/[/URL]</p></blockquote><p></p>
[QUOTE="-Pjackso, post: 3623235, member: 8119"] Trees, shade, weather-factor (clouds), effective day-light hours - all effect PV output and change depending on time of year. (Best case: 8.0 effective day-light hours in December, and 11.0 effective day-light hours in June) Without being a math wizard and doing calculations - you need real outputs based on other local installed systems. Ask your contractor for similar sized systems and the real KWh monthly outputs. Ask for 2-3 years of outputs, as KWh output changes considerably over the months/seasons. Calculate the annual average KWh/month and multiply by your electric rate. That'll be your average PV savings per month, then compare to the total costs and ROI. If the 'other' system is a difference PV size - be sure to adjust the numbers accordingly. ...or reference the SunnyPortal for real-outputs (previously linked). Other considerations: The future costs? Consider that the cost of electricity will only go up in the future. So a simple-ROI isn't the best approach. The real saving may be in 10 years when the KWh price is ...double? How's your roof? There's no point installing a PV system over a roof that's 3 years from being replaced. It'll have to be completely removed for roof replacement, then re-installed. (insert: damaged?) A standing-seam metal roof would be ideal, as standing seam don't have exposed fasteners and will last 50+ years. Metal roofs with exposed fasteners are only good for 15-20 years, as the screws start getting loose and start slowly leaking. Can you DIY? If you can get the racking/panels and install yourself (no labor or bank loan) - then the ROI is about 5-6 years. If you can DIY - then it's a crazy good deal. For further reading: [URL unfurl="true"]https://www.okshooters.com/threads/solar-panels-for-home-energy.180456/[/URL] [URL unfurl="true"]https://www.okshooters.com/threads/solar-energy-system.157153/[/URL] [URL unfurl="true"]https://www.okshooters.com/threads/solar-systems.121164/[/URL] [/QUOTE]
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