1 The Future is Clean Energy Solar Power Basics for Residential Customers Courtesy of DOE/NREL
2 Contact Information Pete Shoemaker Pacific Energy Center 851 Howard St. San Francisco, CA (415)
3 Energy Efficiency First Solar System Utility Bill Energy efficiency measures
4 Energy Efficiency First AVE Solar System Utility Bill Utility Bill Energy efficiency measures
5 Agenda Technology What is it? How does it work? Feasibility Will it work for me? Can I afford it? Next Steps How can I get one?
6 Light energy Photovoltaic (PV) Electricity produced directly from light Heat energy Concentrated Solar Power (CSP) Electricity produced by steam Solar Pool Heating Hot water for pools Solar Water Heating (SWH or Solar Thermal) Hot water for domestic use (DHW) All courtesy of DOE/NREL 6
7 One-Minute Summary Rent a portion of utility grid output Buy your own power plant CURRENT Same electricity POSSIBLE RENT Courtesy of DOE/NREL OWN Source: Pete Shoemaker Your home needs electricity The basic economics are just like the rent vs. buy of purchasing a home.
8 One-Minute Takeaway It works reliably for a long time. It requires good sun access in the middle of the day. Our weather is great fog is a minor factor. It is not taxable and will likely raise the value of your house. Accurate financial analysis is key.
9 Terminology System Sizing 200 HP engine: means that 200 horsepower is the MAXIMUM it will produce. 4 kw PV system: means that 4,000 watts (4 kw) is the MAXIMUM it will produce in full sunlight.
10 Photovoltaic Effect Solar Electric photo = light; voltaic = produces voltage Photovoltaic (PV) systems convert light directly into electricity (using semi-conductor technology)
11 PV Terminology Cell Module Array Cell Module or Panel Courtesy of DOE/NREL
12 Crystalline Silicon PV Products Firm, like crystals Longest track record, over 50 years Most common, over 85% of the market Highest efficiencies: avg. 15%, up to 22% Requires about 100 sf. per kilowatt Source: DOE National Renewable Energy Laboratory
13 Thin Film PV Products Source: DOE National Renewable Energy Laboratory Can be applied on many different materials Longevity still to be proven Production growing at high rate Lower efficiencies: avg. 7%, up to 15% Has potential for big cost reduction Requires about 200 sf. per kilowatt
14 Crystalline vs. Thin-Film 1.2 kw Crystalline Silicon Thin-film needs about twice as much space for the same-size system, but the total cost is about the same. 1.2 kw Thin-Film Courtesy of DOE/NREL
15 1.2 kw (1,200 w) 75 square feet 16w per sq.ft. Efficiency vs. Capacity Capacity = total power Efficiency = power per sq.ft. 1.2 kw (1,200 w) 150 square feet 8w per sq.ft. Courtesy of DOE/NREL
16 Inverter System Inverter Inverter DC AC Changes Direct Current (DC) to Alternating Current (AC)
17 Micro Inverter One per module Inverts DC to AC right there Inverter Panel & meter Combiner box & communicator
18 Typical System Components Array Inverter Meter Panel Balance of System (BOS) Source: Darren Bouton Loads
19 PV Monitoring Extra hardware sends inverter data to internet Inverter company or 3 rd party hosts website Customer can view system from home or remotely Current and historical data can be displayed Can cost extra but some companies are offering it as standard package. Courtesy SMA
20 PV Monitoring Total system history. Real-time, per panel. Courtesy Enphase
21 Typical System Components 1. Solar array 2. Inverter 3. House electrical panel Source: PG&E
22 It works during the day, but what about at night? Previously, there was only one solution: Courtesy of DOE/NREL Store the excess in batteries during the day, then draw off the batteries at night, or when it s cloudy. But now?
23 Net Metering The utility grid is a twoway street! Source Andy Black 2006 All rights reserved. Electricity can be sent back to the grid by the customer. X Eliminates the need for batteries. Reduces cost and maintenance. Ensures a constant supply of electricity.
24 Net Metering Sell Power to the Utility by Day Source Andy Black 2006 All rights reserved. Buy Power at Night and Winter. Exchange at retail Annual billing cycle Understanding PV Financial Analysis 2006 Andy Black. All rights reserved.
25 Net Metering The grid is like your big battery. Your meter keeps track of the storage (debits or credits). You buy and sell at the going rate. You can reduce your yearly electric bill to a small amount, but you cannot make a profit. Spin your meter backwards
26 Net Metering Meter Customer side Utility side
27 Net Metering Generation: 3 kwh Surplus: 2 kwh Load: 1 kwh Customer side Meter Cash credit: $.60 2 $(going rate) Utility side
28 Net Metering Generation: 1 kwh Surplus: 0 kwh Load: 1 kwh Meter Cash credit: $.00 Customer side Utility side
29 Net Metering Generation: 0 kwh Need: 1 kwh Load: 1 kwh Customer side Meter Cash debit: $.09 1 $(going rate) Utility side
30 Net Metering kwh/mo Average monthly usage PV system production 750 Roll over May SUMMER October WINTER April
31 Net Metering kwh/mo Average monthly usage PV system production 750 The surplus covers the shortfall, and your yearly bill is minimal May SUMMER October WINTER April
32 Net Metering kwh/mo Average monthly usage PV system production 750 PV system produces less than your yearly usage. 500 You pay this amount 250 May SUMMER October WINTER April
33 Net Metering kwh/mo Average monthly usage PV system production 750 PV system produces more than your yearly usage. 500 You are paid a different rate for this amount about 4 per kwh. 250 May SUMMER October WINTER April
34 Net Metering Why don t you get paid if your system over-produces? Cost of power at $.16/Kwh Wholesale cost: $.10/kwh Markup to cover grid maintenance: $.06/kwh CPUC rule PG&E must comply The full retail rate that PV owners get paid for their power includes a subsidy (markup) that comes from all rate payers The CPUC determined that this subsidy would only be allowed to cover your usage, not for you to go into the power-generation business
35 Net Metering No Blackout Protection Unsafe to send live power into grid while workers repairing downed lines X No voltage reservoir means house current could fluctuate and damage appliances X Understanding PV Financial Analysis 2006 Andy Black. All rights reserved.
36 PV System Types Stand-Alone ( Off-Grid ) With batteries Grid Interactive ( On-Grid ) Grid-tied only <=Today s Focus no batteries needed Grid-tied with battery backup
37 Grid-Tied System Green energy from your own PV system. The reliability and security of the utility company. Best of both worlds.
38 Rooftop Residential Courtesy of DOE/NREL
39 Rooftop Solar Roof Tiles Courtesy of DOE/NREL
40 Ground Mounted Residential Source: Pete Shoemaker Courtesy of DOE/NREL
41 Reliability Source: NASA
42 Reliability Mature technology over 50 years old Essential to the space program Millions in use Long warranties backed by large, stable companies Products tested and approved by CEC
43 Environmental Footprint Best overall estimates from 1 to 2.5 years Depends on site and power production--in California is about 1.1 years. Shrinking as costs drop and production gets greener Pays back 10 to 30 times or more its environmental cost Most PV manufacturing plants will have their own PV system on the roof. Source: January 2008 Environmental Science & Technology Courtesy of DOE/NREL
44 Technology Summary No moving parts Reliable with long warranties Very widespread Scalable, adaptable Low footprint Big environmental benefits
45 Agenda Technology What is it? How does it work? Feasibility Will it work for me? Can I afford it? Next Steps How can I get one?
46 Will it work for me? Criteria, in order of importance: 1. Shading 2. Shading 3. Shading 4. Orientation (north-south) 5. Tilt (from horizontal) 6. Weather
47 Source: NASA
48 Sunset Shading Solar Window Shade-free from 9 to 3 Sunrise Good chance for PV
49 Bad chance for PV Shading
50 Orientation For tilted roof: North Not good West Good Very good OK East South
51 Orientation N W E S Overhead maps
52 Tilt 12 ft. 18 deg. 4 ft. Typical roof in this area is 4:12. For every 12 feet horizontal, it drops 4 feet. This equals 18 degrees up from horizontal. Normal roof pitch is a very good mounting angle.
53 Trackers Courtesy of DOE/NREL For most home systems, the extra expense and maintenance of tracking motors is not worth the efficiency gain. Better to buy a few extra panels.
54 Weather Source: w w w.sf.solarmap.org
55 Weather California climate ideal for solar Panels produce in all light Fog has cooling effect, which raises efficiency Microclimates likely less than 15% loss from normal
56 Roof Issues Don t put a new PV system on an old roof! Minimum roof life should be 5 7 years. Good idea to do PV and roof at same time Estimate for panel removal/replacement is $1,000 per Kw of system size. Courtesy London Flat Roofing, Ltd
57 Will it work for me? Need solar window Need area facing S, W or E Tilt is usually fine, even flat OK Weather is generally good
58 Can I afford it? Is it too expensive? Compared to what? Let s see what you have now
59 Current Situation PG&E monthly electric bill for a large home user: rate tiers = $ = $ = $ = $ = $ 3.12 $ Used 978 Kwh costing $
60 E-1 / PG&E Standard Rate Schedule (Residential) PG&E E-1 Residential As of 7/1/12 Rate 6/1/10 Cents per kwh Less than 100% 101% - 130% % - 200% % - 300% Percentage of baseline allocation Over 300%
61 Current Situation The less you use, the more you eliminate the expensive upper tiers: rate tiers = $ = $ = $ = $ = $ 3.12 $
62 Current Situation The less you use, the more you eliminate the expensive upper tiers: rate tiers = $ = $ = $ = $ = $ 3.12 $ Used 421 kwh costing $ From 978 Kwh to 421 Kwh -- from $250 to $50. Lowering the usage 57% lowers the bill 80%.
63 E-1 / PG&E Standard Rate Schedule (Residential) PG&E E-1 Residential As of 7/1/12 Rate 6/1/10 Cents per kwh Less than 100% 101% - 130% % - 200% % - 300% Percentage of baseline allocation Over 300%
64 E-1 / PG&E Standard Rate Schedule (Residential) PG&E E-1 Residential As of 7/1/12 Rate 6/1/10 Cents per kwh Lower ROI Less than 100% 101% - 130% % - 200% Solar reverses the rate tier effect 201% - 300% Percentage of baseline allocation Higher ROI Over 300%
65 Current Situation Case study Electric bill: $100/month = $1200/year After 10 years you will have paid $12,000 if rates do not rise. Is this a reasonable assumption?
66 Current Situation Case study Electric bill: $100/month = $1200/year With annual inflation increases, after 10 years you will have paid around $13,000 to $16,000 No equity Nothing paid off So the real question is Can solar be less expensive than this?
67 Costs & Incentives Initial cost is high... because you are paying for 30 to 40 years of electricity up front. But after that the costs are very low because the fuel is free! There are ways to reduce the cost and eliminate the sticker shock...
68 The CSI makes PV Economical: Gives financial incentives to lower the cost Secure Screens and tests equipment Requires long warranties Helps screen and check installers Standardizes production estimates Easy Helps installers handle everything
69 California Solar Initiative (CSI) SB 1 CPUC (California Public Utilities Commission) Existing Residential Existing Commercial Commercial New Construction CSI (California Solar Initiative) CEC (California Energy Commission) Residential New Construction NSHP (New Solar Homes Partnership) Program Administrator Program Administrator PG&E PG&E
70 CSI Financial Incentives numbers EPBB = Expected Performance-Based Buydown PBI = Performance-Based Incentive EPBB PBI Overall outline: Incentives step down according to amount of PV installed (MW)
71 CSI Financial Incentives numbers Data as of 9/7/12 MW remaining MW under review = best estimate of how much left. For PG&E residential: = MW. Trigger Tracker. Helps determine when incentives drop.
72 Federal Incentives Federal Tax Credit 30% of net cost No cap Extended through Tax Incentives for Businesses Accelerated Depreciation (first 5 years) Resources SEIA Guide to Federal Tax Credits
73 PV Statistics & Performance for the Average Family of Four (monthly electrical bill $100-$200) 4.0 Kw AC System COST (before rebate = $6,500 / kw) $26,000 REBATE (est. $180 / kw) $720 TAX CREDIT $7584 NET COST $17,696 Maintenance (25 40 yrs.) $5,000 Total Lifecycle Cost $22,696 kwh Production Space requirements ~ 6,500 kwh / year ~ s.f. Avg. cost of power now ($150/mo) $.18/Kwh 25-yr. cost of power (est.) $.14/Kwh 40-yr. cost of power (est.) $.09/Kwh
74 San Francisco Additional Rebate Basic amount $2,000 per home for SF residents. $750 more if the installer is an SF-based company. In addition to the utility rebate and federal tax credit.
75 San Francisco Additional Rebate
76 PV Statistics & Performance for the SF Average Family of Four (monthly electrical bill $75-$150) 3.0 Kw AC System COST (before rebate = $6500 / kw) $19,500 CSI REBATE (est. $180 / kw) - $ 540 TAX CREDIT - $5,688 SF REBATE - $2,750 Taxability of SF rebate +$ 550 NET COST $11,072 Maintenance $ 4,000 Total Lifecycle Cost $15,072 kwh Production Space requirements Avg. cost of power now ($100/mo) 25-yr. cost of power (est.) 40-yr. cost of power (est.) ~ 5000 kwh / year ~ 300 s.f. $.15/Kwh $.13/Kwh $.08/Kwh
77 Three Ways to Buy 1. Full purchase (cash or borrowing) You Owner of system Borrow money or pay cash Full payment up front Maintain and monitor system $$$ PV Vendor Design and install Sell Honor warranties (equipment & labor) Economics: Cash / total savings Loan pmt. / monthly savings
78 2. Solar Lease Three Ways to Buy You Low or no money down Fixed lease payment Possible buyout in the future Economics: Lease pmt. / monthly savings $ $ PV Vendor Owner of system Design and install Lease Maintain and monitor system Honor warranties (equipment & labor) Remove system at end if needed
79 Three Ways to Buy 3. Power Purchase Agreement (PPA) You Low or no money down Monthly power payment Possible buyout in the future Economics: Monthly pmt. / monthly savings $ $ PV Vendor Owner of system Design and install Sell power Maintain and monitor system Honor warranties (equipment & labor) Remove system at end if needed
80 Time of Use Rates Seasonal load PG&E 2006 Annual Usage
83 Time of Use Rates Cents per Kwh Hours of the Day E-6 summer rates (May October)
84 Time of Use Rates Kwh Produced Hours of the Day Typical summer production
85 Time of Use Rates Cents per Kwh Hours of the Day Summer pattern (May October)
86 Time of Use Rates Sell Cents per Kwh Buy Buy Hours of the Day Buying low and selling high adds value.
87 Should I go on a TOU rate with my PV system? High On-peak usage Med No Low Yes 0 25% 50% 75% 100% Percentage of yearly usage covered by solar
88 Return on Investment Monthly Cash Flow: Financed by a home-secured loan Loan interest is tax-deductible Or lease program no financing, low down pmt. Assuming historical rate escalation continues Monthly cash flow can be immediately positive for many people. They can start making money from day one and continue for over 30 years! Solar lease programs can lower or eliminate the down payment and be cash-positive as well.
89 Maintenance: Replacing Inverter Minimum inverter warranty is 10 years. Probable lifetime 15 years or more. Replacement is typically factored in economic analysis. Trend in electronics is to get smaller and cheaper Source: DOE / NREL
90 Maintenance: Washing Panels Three basic categories for rainy / dry season areas Washed as often as necessary ~ 1.0 Washed once in July ~ 0.96 Never washed ~ 0.93 Factors affecting number Rainy / dry seasons Dirt roads Near agricultural activity Close to road surface of busy street In airport flight path Source: DOE / NREL Bottom line: Washing panels helps, but is not crucial unless area is particularly dusty or there are other unusual factors (birds).
91 Increase in Home Value Appraisal Value Will likely go up Less utility cost means more money available for mortgage payment Data so far is small, but supportive Much more to come as solar houses turn over Solar Rights Act California law that supports solar Keeps HOAs and other CC&Rs from prohibiting solar systems Forbids increased property taxes on owner s system Restriction ends when home is sold, and assessment can go up to reflect system
92 Agenda Technology What is it? How does it work? Feasibility Will it work for me? Can I afford it? Next Steps How can I get one?
93 Installing Solar PV at Your Home STEP 1: Complete an Energy Audit STEP 2: Contact and Choose an Installer INSTALLER HANDLES THE REST STEP 3: Complete and Submit Applications for CSI STEP 4: Get city Permits and Install System STEP 5: Schedule Final Building Inspection STEP 6: Schedule Final Utility Inspection STEP 7: Claim Incentives
94 Contact & Choose an Installer Find installers Choose which ones to contact Obtain bids Evaluate bids and pick best one Arrange financing (if necessary)
95 Find Installers best site for both PV and solar thermal California Energy Commission x.html NorCal Solar Business Members CalSEIA Members Find an Expert link Personal references
96 Analyzing Bids: Production estimates Everyone must use EPBB online calculator Helps standardize estimates, eliminate over promising EPBB requires tilt, orientation, and shading data Shading is the most difficult to assess and can vary in bid estimates. If it varies widely ask about it. EPBB printout must be included in CSI application
97 Analyzing Bids: Key Information 1. Full price, before incentives. This includes all adders (such as extra roof charges), and extras (such as monitoring), an estimate for permit fees (around $300), and taxes. 2. The system size in CEC AC watts (industry standard). Do not accept just the DC system size. 3. The per-watt price. This is determined by dividing the full price by the system size. This is the unit price that allows you to compare apples to apples. It will typically be around $8 to $9 per watt.
98 Analyzing Bids: Per-Watt Price Base price: $20,000 Roof adder: $2,000 Permit fee: $500 Total: $22,500 System Size: 4.0 Kw DC 3.38 Kw AC (CEC) (3,380 watts) Per-watt price: $22,500 / 3,380 = $6.65/watt
99 Three options: Comparing Bids Sharp 185 panels, 3.19 Kw AC, $6.35/watt Evergreen 180 panels, 3.12 Kw AC, $6.22/watt Kyocera 190 panels, 3.28 Kw AC, $6.45/watt If target of 100 Kw is met, price will drop to $5.75/watt.
100 Final Word: Don t forget the bottom line Paper Wealth
101 Additional Information PG&E s Solar Website PG&E PG&E Solar Phone Number For more information on PG&E s environmental efforts, please visit our website
102 The Future is Clean Energy Pacific Energy Center Pete Shoemaker (415)
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