Residential Solar + Storage Backup Power Solutions. T.J. Merrill We power what s next

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1 Residential Solar + Storage Backup Power Solutions T.J. Merrill TJ@A-Rsolar.com We power what s next

2 Family Cabin: Granite Falls, WA Montana native UW Graduate Msft Alum NABCEP certified Solar + Storage Designer 6.96kW array providing almost 100% offset

3 IKEA: Largest solar array in WA State 1.3 MW system 244,000 sq ft array 3,268 panels 1,261,000 kwh/yet Could power 130+ homes for a year

4 Session Learning Objectives 1. Describe available applications of energy storage in the Northwest. 2. Explain the top solutions for energy storage. 3. List the pros and cons of various energy generation systems and energy storage solutions. 4. Identify an energy storage solution best suited for your particular needs.

5 Why energy storage? 1. Resilience: Backup power for your home 2. Increase your independence Use your solar at night Protect yourself from future changes in tiers/rates 3. It helps the world transition to clean energy 4. Live off grid*

6 Are you ready? Storms Earthquake Other Be prepared for two weeks+ outage

7 Most common Power Sources Grid Solar / RE Generators Note: none of the above store energy without energy storage (battery). All power must be created and consumed instantaneously

8 Grid Pros Low cost if available Available ondemand Some utilities are cleaner than others Cons Fragile Complex Rate increases Often powered by coal / gas

9 Generators Pros Comparatively inexpensive to buy.. Cons Can be expensive Toxic (CO) Fuel availability & storage Must be running constantly to have any power Short warranty Maintenance LOUD

10 Solar Clean, renewable power source Increases the value of your home while saving $$ 80% of your system is paid back through Federal & State incentives Often cash flow positive & pays for itself in 2 4 years on an asset basis 6 8 years on a cash flow basis Add battery solution to provide standby power for key loads Cons: Cost Must conserve in Western WA Winters

11 How much does 9kW of Solar cost? ~$185/month financed, cash flow positive ~$25,000 if paid in cash Less $7,700 Federal Tax Credit Less $860/year in utility savings Less $12,500 in Production incentives (~$1,800/yr) Total investment after incentives ~$5,000

12 How does Solar work without battery?

13 A typical summer Solar Day

14 A typical Solar Year (9kW array)

15 A hybrid grid tied battery system allows solar to go back to work during an outage

16 Why energy storage? 1. Resilience: Backup power for your home 2. Increase your independence Use your solar at night Protect yourself from future changes in tiers/rates 3. It helps the world transition to clean energy 4. Live off grid*

17 How does Solar + Storage work? Winter Storm Example: Solar is generating 7kWh/day in Dec Your home is using 8 kwh/day for standby loads 1 Tesla Powerwall will provide 12.5 days of standby power Any other month of the year you could continue indefinitely (EARTHQUAKE) Or conserve!

18 A typical Solar Year (9kW array)

19 Questions to ask: What do you need to power? How much Energy do your loads take? Location? How automated? For how long? Generator? Budget?

20 Most common loads to consider for backup Refrigerator(s) & Freezer(s) I lost over $1,000 in food twice Furnace: even though you may have a gas furnace it needs power to ignite and to run the central fan Lights / outlets / chargers Internet / Security Pump(s) Water, septic, etc Medical Devices when paired with UPS in approved situations

21 Examples of what not to backup Sauna / hot tub / pool Electric vehicle (unless it s summer) Electric ranges (use a microwave) Air conditioners (unless it s summer and it is sized properly)

22 Typical Client Has numerous outages per year Worried about extended outages from earthquake and/or really big storm Wants to have lights, outlets, refrigeration, gas furnace, Internet and well pump to work Wants to avoid generator in most cases Cost, maintenance, noise, fumes Gas will be shut off after quake! 9kW+ solar array

23 Top solutions Tesla Powerwall Lowest cost per kwh 5kW power 13.5kWh of stored energy Scalable to 9 per service No Generator integration Solar Edge StorEdge Integrated Competitively priced with Powerwall 5kW power 10 20kWh stored energy No Generator SMA Sunny Island Most flexible 6 12kW 120kWh+ Generator charging fully supported Auto start/stop Battery systems qualify for the 30% Federal Tax Credit when paired with new or existing solar system

24 Tesla Powerwall 2

25 Tesla Powerwall 5 kw of power each 13.5 kwh of usable energy storage ~$12,000 ($10,000 after tax credit)

26 Typical Powerwall installation

27 Monitoring - Tesla

28 Solar Edge StorEdge + LG RESU10 7.6kW Solar Inverter + Battery Inverter in one LG RESU10: 10kWh LiOn battery ~$10,000 ($7,000 after tax credit)

29 Solar Edge StorEdge + LG RESU10H

30 Typical Installation

31 Monitoring Solar Edge

32 SMA Sunny Island + LG RESU10

33 Typical Installation: SMA SMA Sunny Island is in its 11 th generation Awaiting certification with next generation Lithium Ion batteries like LG RESU10 Supports charging from solar or gas generator Typically $15k $20k $10k $15k after tax credit

34 SMA Sunny Island

35 Which Hybrid grid tied Solar Energy Storage System is right for me? Do you want optional Gas Generator charging? Yes No SMA Sunny Island or upcoming Sunny Boy Storage Powerwall AC (up to 45kW) Solar Edge StorEdge (up to 5kW) 2017 Copyright, A&R Solar

36 Future of home energy storage? A home battery will become common Your EV will get smarter and integrate into your home and then the grid EV2H: EV to Home EV2G: EV to Grid Today, no integration to high voltage battery pack without voiding warranty

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