Whole House Solar Generator Case Study

Single-Family Residence - July 2011

Enphase Microinverters, Web presence, Rare combination of generator backup, Locus utility grade meter for SREC logging, Production exceeds the need by 15%, Tankless hot water based on HTP boiler (Made in MA!)

Quick Facts

Average Annual Savings

$1,280

Energy Needs Met

100%

or more of electricity

Net Investment

$22,000

Return on Investment

12.6%

Property

Owner:: Anil & Naomi Navkal
Type:: Single-Family Residence
Address:: 14 Rock O Dundee Rd, Andover , MA 01810
Size:: 3,500 sq ft
Energy need met:: 100% or more of electricity
Designations:: Deep energy retrofit; Passive house
Event Participation:: NESEA Green Buildings Open House 2013 Host

Technology

Type:: Solar PV
Installed:: July 2011
Size of System:: 7.7 kW
Monitor performance:: http://tinyurl.com/navkal-pv
Purposes:: To generate electricity

Financial Details

Gross Cost of System:: $44,000
Value of Rebates:: $6,000
Value of Tax Credits:: $15,000
Net Cost of System:: $22,000
Annual Savings:: $1,280
Annual Revenue:: $1,500
Own or Lease:: Cash Purchase

Professionals & Suppliers

Products:: Enphase Energy; Panasonic
Installers:: Brightstar Solar

What You Need to Know

Description:

Recently we have added a whole house generator to provide backup power. This makes the system quite unique as not too many folks have all three in one place. It is required to isolate PV system under outage conditions. To do this using standard Transfer Switch and yet meet the electric code, without violating Warranty was the tricky part

Other Benefits:

Enphase gives you on line per module monitoring. Very helpfull!

Maintenance Requirements:

None so far.

Efficiency or Sustainability Improvements:

Radiant Heat, Tankless Hot water, 8 zones for heat, 3 separate A/C units for air conditioning.

My Motivation:

9/11

Advice:

Do you homework. Talk to folks who have PV. They all love to share their experience. Ask them what they could do differently if they were to start all over.

Experience with Installer:

Simply great!

Open House Info:

Come on down. Ring the bell, if we open the door, the house is open house!

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