Solar

255 Chestnut fall 2019

recommended by Sunwealth

• All Energy Solar https://www.allenergysolar.com/where-we-are/ 1-800-620-3370 talked to someone, they said you cannot assign your net metering to another account ant that they arent allowed to do over 120% of use
• Endless Solar not in Boston
• United Solar https://www.sun1776.com/commercial 1.855.SUN.1776 Kevin will get back to me
• Resonant Energy http://www.resonant.energy/commercial (617) 506-9248 Madelaine will call back

recommended by NextDoor

• Sun Bug http://sunbugsolar.com/businesses 617-500-3938 left message for Jeremy
• Blue Sel Solar https://www.blueselcommercialsolar.com/contact-us/ (781)569-6767 left message
• Sunlight Solar eh

Energy Sage https://www.energysage.com/market/ 888-802-8806

• Southern Light solar https://southernlightsolar.com/ (774) 473-9339 left message but Alex Doucet 401-525-1070

questions

• I only pay the public meter. Can credits be applied to another account?
• What are the requirements on the existing electrical service?

net metering

Credit allocation The host customer of a net metering facility determines what happens to the net metering credits a facility generates by submitting a form called Schedule Z to the electric company. A host customer may change Schedule Z no more than twice in one calendar year, unless there is mutual agreement to change it more often. Contact your electric company for more information about Schedule Z. G.L. c. 164, § 139(b)(1).

As a host customer, you may use net metering credits to offset your bill from your electric company. You may also assign net metering credits to other accounts (even if they are not your accounts) as long as all the accounts are:

with the same electric company; and located within the same ISO-NE load zone. If you allocate net metering credits to a public entity, there is no effect on the public entity’s 10 MW limit. A public entity may receive an unlimited amount of net metering credits with no effect on its 10 MW limit. The capacity of a net metering facility within the public cap only affects the host customer’s 10 MW limit.

solarET3034Ux

http://shop.solardirect.com/product_info.php?manufacturers_id=&products_id=707

http://www.dsireusa.org/incentives/homeowner.cfm?state=MA&re=1&ee=1

Commonweath SolarII reqs

Approved Equipment Lists

Interconnection Agreement. A separate application must be submitted to the electric utility to start the formal interconnection process, and sufficient lead time should be allowed, based on time frames listed in the Interconnection Tariff (see link below). All PV projects must have an appropriate electric utility interconnection agreement in place at the time of interconnection to the utility grid.

small inverters

Enphase M215 microinverter UL approved $150+32(connector) 220 watt on the approved equipment list

plugs into wall 1000 watt $253 not UL approved

Sunteams 1500 (240 Vac) $699 1500 Watt Solar Grid Tie Inverter, UL & CEC Approved on the approved equipment list has reporting display]

Actual vs rated power

For wind turbines the industry average installed cost is about $2 million per megawatt, about $2.00/watt. Over the course of a year, however, a turbine produces only about one-third (33%) of its theoretical maximum capacity So it costs about $2/1/3watt or about $6/produced_watt/yr. Run for a year each watt of capacity produces 24*365/1000 or 8.76kwH of electricity which priced at $.166/kwh creates about $1.45 worth of electricity. Simple payback in 6/1.45 or 4.13 years. Each kW of wind capacity produces 1/3*24*365 or 2920kWh/yr (at Boston rates $.166/kWh*2920kWh=$485, a MW turbine would produce $485,000 Actaully producers get about .05/kWh so it is more like $146,000/yr with simple payback taking 13.7years)

Solar PV in Boston on the other hand, if it did cost $2/watt and since 1kw of panels actually produces 1150kWh of electricity in a year then dividing that by the number of hours in a year gives you the actual average watts produce averaged over darkness and clouds. So, since 1kW of capacity produces on average 1150kWh in a year, each installed kW produces 1150kWh/(24hr/d*365d) = .131 kW averaged over the year or about 13% of the installed ratings (in Boston). So it costs $2/.131W or about $15.27/produced_watt/yr. Again each watt of capacity produces 24*365/1000 or 8.76kwH of electricity which priced at $.166/kwh creates about $1.40 worth of electricity. Simple payback in 15.25/1.45 or 10.5 years.

A KW worth of panels will produce about $190/year of electricity on my roof. In 15 years that's about $3000 worth of electricity so to break even you need installed cost to be < $3.00/watt.

If you could install a 1KW system at $2.00/watt you make a return of about $1000/15yr or $66/yr or $66 on a $2000 investment or about 3.3% annual interest on your investment.

"PVWATTS v.2: AC Energy and Cost Savings"

"Station Identification"
"Cell ID:","0274366"
"State:","Massachusetts"
"Lat (deg N):", 42.37
"Long (deg W):", -71.03
"PV System Specifications"
"DC Rating:"," 1.0 kW"
"DC to AC Derate Factor:"," 0.770"
"AC Rating:"," 0.8 kW"
"Array Type: Fixed Tilt"
"Array Tilt:"," 30.0"
"Array Azimuth:","180.0"

"Energy Specifications"
"Cost of Electricity:","16.6 cents/kWh"

"Results"
"Month", "Solar Radiation (kWh/m^2/day)", "AC Energy (kWh)", "Energy Value ($)"
1, 2.79, 69, 11.46
2, 3.60, 80, 13.29
3, 4.59, 109, 18.11
4, 4.79, 108, 17.94
5, 5.39, 120, 19.94
6, 5.50, 115, 19.11
7, 5.45, 117, 19.44
8, 5.34, 116, 19.27
9, 4.83, 104, 17.28
10, 3.97, 91, 15.12
11, 2.72, 62, 10.30
12, 2.43, 59, 9.80
"Year", 4.29, 1150, 191.06

If you could install a 1KW system at $2.00/watt you make a return of about $66/yr or $66 on a $2000 investment or about 3.3% annual interest on your investment.

02130 calculator At 30 degree tilt the average solar is <math>4.29\frac{kWh}{\frac{m^2}{day}}</math> The bedroom roof would probably produce around $220/year at $.15/kwH

existing use

hot water

~30 therms/mo

DIY panels

10w 12v mounts to panel $59

about charge controllersa 555 charge controller

diy instructions

tabbing wire flux pen bus wire diodes

epoxy]