Solar

calculator

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.

<!B>Station Identification<!/B> Cell ID: 0274366 State: Massachusetts &#160 Latitude: 42.1 &#176 N Longitude: &#160 &#160 70.9 &#176 W <!B>PV System Specifications<!/B> DC Rating: 1.00 kW DC to AC Derate Factor: 0.770 AC Rating: 0.77 kW Array Type: Fixed Tilt &#160 Array Tilt: 30.0 &#176 Array Azimuth: 180.0 &#176 Energy Specifications Cost of Electricity: &#160 &#160 16.6 &#162/kWh		<!B>Results<!/B> Month &#160 Solar Radiation (kWh/m2/day) AC Energy (kWh) Energy Value ($) 1&#160 2.79&#160 &#160 &#160 69&#160 11.46&#160 2&#160 3.60&#160 &#160 &#160 80&#160 13.29&#160 3&#160 4.59&#160 &#160 &#160 109&#160 18.11&#160 4&#160 4.79&#160 &#160 &#160 108&#160 17.94&#160 5&#160 5.39&#160 &#160 &#160 120&#160 19.94&#160 6&#160 5.50&#160 &#160 &#160 115&#160 19.11&#160 7&#160 5.45&#160 &#160 &#160 117&#160 19.44&#160 8&#160 5.34&#160 &#160 &#160 116&#160 19.27&#160 9&#160 4.83&#160 &#160 &#160 104&#160 17.28&#160 10&#160 3.97&#160 &#160 &#160 91&#160 15.12&#160 11&#160 2.72&#160 &#160 &#160 62&#160 10.30&#160 12&#160 2.43&#160 &#160 &#160 59&#160 9.80&#160 Year&#160 4.29&#160 &#160 &#160 1150&#160 191.06
<INPUT TYPE="submit" STYLE="COLOR:#555555; background-color:#AAAAAA;" VALUE="Output Hourly Performance Data"> (Gridded data is monthly, hourly output not available.)		<FORM ACTION="pvwattsv2_csvout.cgi" TARGET=_blank METHOD=POST> <INPUT TYPE="hidden" VALUE=0274366 NAME="cellid"><INPUT TYPE="hidden" VALUE=Massachusetts NAME="state"><INPUT TYPE="hidden" VALUE=42.366665 NAME="lat"><INPUT TYPE="hidden" VALUE=-71.033333 NAME="lng"><INPUT TYPE="hidden" VALUE=1.000000 NAME="dcrate"><INPUT TYPE="hidden" VALUE=0.770000 NAME="derate"><INPUT TYPE="hidden" VALUE=0.770000 NAME="acrate"><INPUT TYPE="hidden" VALUE=0 NAME="mode"><INPUT TYPE="hidden" VALUE=30.000000 NAME="tilt"><INPUT TYPE="hidden" VALUE=180.000000 NAME="sazm"><INPUT TYPE="hidden" VALUE=16.614000 NAME="cost"><INPUT TYPE="hidden" VALUE=86375.734375 NAME="radkwh0"><INPUT TYPE="hidden" VALUE=100791.257812 NAME="radkwh1"><INPUT TYPE="hidden" VALUE=142152.687500 NAME="radkwh2"><INPUT TYPE="hidden" VALUE=143652.296875 NAME="radkwh3"><INPUT TYPE="hidden" VALUE=167151.656250 NAME="radkwh4"><INPUT TYPE="hidden" VALUE=164975.890625 NAME="radkwh5"><INPUT TYPE="hidden" VALUE=168921.421875 NAME="radkwh6"><INPUT TYPE="hidden" VALUE=165441.765625 NAME="radkwh7"><INPUT TYPE="hidden" VALUE=144958.765625 NAME="radkwh8"><INPUT TYPE="hidden" VALUE=123187.296875 NAME="radkwh9"><INPUT TYPE="hidden" VALUE=81726.500000 NAME="radkwh10"><INPUT TYPE="hidden" VALUE=75481.664062 NAME="radkwh11"><INPUT TYPE="hidden" VALUE=1564816.875000 NAME="radkwh12"><INPUT TYPE="hidden" VALUE=68771.726562 NAME="ackwh0"><INPUT TYPE="hidden" VALUE=80435.898438 NAME="ackwh1"><INPUT TYPE="hidden" VALUE=109088.468750 NAME="ackwh2"><INPUT TYPE="hidden" VALUE=107583.609375 NAME="ackwh3"><INPUT TYPE="hidden" VALUE=120215.140625 NAME="ackwh4"><INPUT TYPE="hidden" VALUE=114630.757812 NAME="ackwh5"><INPUT TYPE="hidden" VALUE=117236.367188 NAME="ackwh6"><INPUT TYPE="hidden" VALUE=115575.828125 NAME="ackwh7"><INPUT TYPE="hidden" VALUE=104060.484375 NAME="ackwh8"><INPUT TYPE="hidden" VALUE=91166.039062 NAME="ackwh9"><INPUT TYPE="hidden" VALUE=62175.652344 NAME="ackwh10"><INPUT TYPE="hidden" VALUE=58764.992188 NAME="ackwh11"><INPUT TYPE="hidden" VALUE=1149705.000000 NAME="ackwh12"><INPUT TYPE="submit" VALUE="Output Results as Text" STYLE="COLOR:#005500; background-color:#DDDDDD;"></FORM> <A HREF="../../savingtext.html" TARGET=_blank CLASS=hide>Saving Text from a Browser</A>
Run <A HREF="http://mapserve3.nrel.gov/PVWatts_Viewer/index.html" CLASS="hide" TARGET=_blank>PVWATTS v.2</A><!/B> for another location		Run <A HREF="../version1" CLASS="hide" TARGET=_blank>PVWATTS v.1</A>

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

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