Home Performance with Solar

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Integrating home performance contracting with solar.

Presentation by Terry Shelton given at the Residential Retrofit Action Clinic on June 2, 2010.

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Home Performance with Solar

  1. 1. Reduce then Produce
  2. 2. Hypothetical Home: 2,500 f² Ranch home in Central Valley Family of 5 Utility provider SCE Annual kWh usage 18,750 Average monthly electric bill $390 Propane Hot water and heating annual propane usage 250 gallons
  3. 3. <ul><li>10.1 kW CEC System to Zero usage </li></ul><ul><li>Quote for System $76,217 </li></ul><ul><li>$52,350. after rebate and tax credits </li></ul><ul><li>8.5 kW System to offset upper tier usage only leaving a bill of $50. +- per month </li></ul><ul><li>Quote for System $63,274. </li></ul><ul><li>$43,520. after rebate and tax credits </li></ul>Preliminary Solar PV Assessment
  4. 4. <ul><li>Annual cooling and heating cost of over $.80 per f² for electricity only (unable to determine propane heating cost) </li></ul><ul><li>We like to see this cost at around $.25 per f² inclusive of gas cost. </li></ul><ul><li>We also determine that Base load usage was quite high @ over $1.00 per f² </li></ul>Bill Disaggregation Revealed
  5. 5. <ul><li>8.5 kW System to offset upper tier usage only leaving a bill of $50. +- per month </li></ul><ul><li>Quote for System $63,274. </li></ul><ul><li>$43,520. after rebate and tax credits </li></ul><ul><li>We also propose a </li></ul><ul><li>3.1 kW System, after running the initial numbers on the home, we determined that if the home was performing well, this system would net the same final results of a monthly electric bill of $50.+_. We offer to do the testing for free with a signed contract for the smaller system. </li></ul><ul><li>Quote for System $24,543. </li></ul><ul><li>$17,122. after rebate and tax credit </li></ul>PV Proposals
  6. 6. <ul><li>A 5 ton HVAC System that has an output of <21kBTU or less than 2 tons. </li></ul><ul><li>This 2 tons is being delivered at a velocity so low that the cold air falls to the floor and does not mix with the air in the rooms. </li></ul><ul><li>The insulation in the attic is R19 batts, that are so poorly installed that they provided an actual R value of less than 9. </li></ul><ul><li>The shell has a high leakage rate. </li></ul><ul><li>The lighting of the home is 90% incandescent which consumes three times what CFL’s consume </li></ul><ul><li>The home also has a constant 150-300 watts in standby electronic losses. </li></ul>Findings of Home Test
  7. 7. <ul><li>Replace HCAC System with 2 ton 14 Seer with all new duct work $12,700. </li></ul><ul><li>Air Seal $3,952. </li></ul><ul><li>Re-insulate attic $8153. </li></ul><ul><li>Up grade lighting $1,500. </li></ul><ul><li>Remote switched plug strips for electronics$250. </li></ul><ul><li>Upgrade ventilation to meet ASHRAE 62.2 $1,700. </li></ul><ul><li>Total $28,255. </li></ul>Cost to do Remediation
  8. 8. <ul><li>Total cost of Remediation work. </li></ul><ul><li>$28,255. </li></ul><ul><li>Available rebates: </li></ul><ul><li>SCE rebate $1,250 </li></ul><ul><li>Federal Tax Credit 30% up to $1,500 </li></ul><ul><li>$1,500. </li></ul><ul><li>Final cost of Remediation work to customer </li></ul><ul><li>$25,505. </li></ul>Incentives for Remediation work
  9. 9. <ul><li>Final cost to customer for 3.1 kW System </li></ul><ul><li>$17,122. </li></ul><ul><li>Final cost of energy remediation work to home </li></ul><ul><li>$25,505. </li></ul><ul><li>Total cost to customer </li></ul><ul><li>$42,627 </li></ul><ul><li>Cost of 8.5 kW of solar to achieve same monthly electric bill </li></ul><ul><li>$43,520. </li></ul><ul><li>Savings over Solar alone </li></ul><ul><li>$893. </li></ul>
  10. 10. <ul><li>A home that is healthier, more comfortable and easier to keep clean. </li></ul><ul><li>Additional savings on propane cost. </li></ul><ul><li>A new HVAC System that will require far less maintenance. </li></ul><ul><li>With the reduction in the area required for PV, there is enough roof area left, to install solar hot water heating, to further reduce the usage of propane. </li></ul><ul><li>Uses 63% less of available solar rebate funding. This will allow more home owners to take advantage of the program. </li></ul>Other Benefits

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