On the solar photovoltaic electric market we are able to list very powerful software tools used
to design integrate and optimize or retrofit existing installations. All software tools are including elaborated
databases implementing  triggers to generate financial return on investment in different scenarios.  

Most of this software tools are expensive and require proprietary training plus additional computer skills. We do
recommend them for their comfort and speed being useful in a productive enterprise.

For "common"  installers, commissioners and engineers we have put together a list of software tools accessed
through personal registration only. They are simple and efficient delivering accurate results.

From here we like to introduce you to following software tools:

Solar Economics Tools

In case you consider to retrofit your roof with a solar array system the economics
of such a situation will help taking a final decision.

A simple financial evaluation online tool can be found at:
http://www.infinitepower.org/calc_pv.html

A solar payback and incentive calculator giving you the best ratting based on the 
postal code and type of renewable energy you use can be find either by
http://estimator.solar-estimate.org.

Another financial solar estimator from BP gives you estimative financial values for your installation
http://bpsolar.cleanpowerestimator.com/bpsolar.htm

Solar Assessment Tools

An evaluation tool which calculates solar angle data based on date, time, and location
http://susdesign.com/sunangle/index.php

A tool to calculate an array of solar angle data that can be copied into 
spreadsheets and other documents.
http://susdesign.com/sunposition/index.php

A tool which allows us to envision the solar path of the sun 
http://susdesign.com/solpath/index.php

Sun path chart programs  in Cartesian coordinates
http://solardat.uoregon.edu/SunChartProgram.htm


PV Systems Engineering Simulations Tools

Retscreen. A decision support tool developed to be used worldwide and evaluate the
energy production and savings, costs, emission reductions, financial viability and risk
for various types of Renewable - Energy and Energy-efficient Technologies (RETs).
http://www.retscreen.net/

PVWatts. The purpose of this tool is to allow you to calculate how much energy will be produced by photovoltaic
solar panels in a geographical area. It takes into account the amount of sun in the area and average
electric rates. The PVWatts Solar Calculator tool at:
http://www.pvwatts.org/

Homer. A computer model that simplifies the task of evaluating design options for both off-grid and
grid-connected distributed generation (DG) applications. Homer's optimization and sensitivity analysis
algorithms allow you to evaluate the economic and technical feasibility of a large number of technology
options and to account for variation in technology costs and energy resource availability.
http://www.homerenergy.com/software.asp

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