Solar

From Wiki2

255 Chestnut fall 2019

recommended by Sunwealth

recommended by NextDoor

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

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

https://www.eversource.com/content/ema-c/about/about-us/doing-business-with-us/builders-contractors/interconnections/massachusetts-net-metering/frequently-asked-questions

There are two types of customers, Host and Beneficiary. Host customers may produce excess generation. Credits from this generation may be applied to the same account or allocated for the benefit of other customer accounts (via a Schedule Z form).
schedule Z https://www.eversource.com/content/docs/default-source/builders-contractors/schedule-z-net-metering-application-ma.pdf?sfvrsn=fdbec262_18
C) If applying for neighborhood net metering, please answer the following questions:
1) Are all participants served by the same distribution company? ____Yes ____No
2) Are all participants served by the same ISO-NE load zone? ____Yes ____No
3) Do all participants reside in the same municipality? ____Yes ____No
NOTE: If any of the answers to the questions in Item C are no, then the facility is ineligible for neighborhood
net metering unless granted an exception by the Department of Public Utilities under 220 C.M.R. §18.09(6).

https://www.mass.gov/guides/net-metering-guide

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

https://soltra.co.za/nominal-vs-actual-power-produced-by-a-solar-pv-installation/

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

heat

hot water

~30 therms/mo

electrical

DIY panels

10w 12v mounts to panel $59

about charge controllersa 555 charge controller

diy instructions

tabbing wire flux pen bus wire diodes

epoxy]

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