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Python interface for NREL PVWatts's API.

Project description

A NREL PVWAtts API v4 Python wrapper.

Installing

There are two ways

Using PIP

$ pip install pypvwatts

Using setup.py

$ python setup.py install

Usage - with class methods

>>> from pypvwatts import PVWatts
>>> PVWatts.api_key = 'myapikeyHLM6x2In2KmX4fxsTRRBT2r9KfDagJjU'
>>> result = PVWatts.request(system_size=4, dataset='tmy2', derate=0.77, lat=40, lon=-105)
>>> result.ac_annual
7607.97607421875

Usage - with instance methods

>>> from pypvwatts import PVWatts
>>> p = PVWatts(api_key='myapikeyHLM6x2In2KmX4fxsTRRBT2r9KfDagJjU')
>>> result = p.request(system_size=4, dataset='tmy2', derate=0.77, lat=40, lon=-105)
>>> result.ac_annual
7607.97607421875

Request parameters and responses

All request parameters correspond to NREL PVWatts API parameters.

This library provides shortcuts for all response output fields, all can be accessed as a result property.

Please refer to NREL PVWatts documentation for further details.

http://developer.nrel.gov/docs/solar/pvwatts-v4/

Raw data

Raw result data can be queried using the result.raw attribute.

>>> from pypvwatts import PVWatts
>>> result = PVWatts.request(system_size=4, dataset='tmy2', derate=0.77, lat=40, lon=-105)
>>> result.raw
{u'errors': [u'You have exceeded your rate limit. Try again later or contact us at http://developer.nrel.gov/contact for assistance']}

Errors

All API errors are reported via JSON response, using the errors attribute.

>>> from pypvwatts import PVWatts
>>> result = PVWatts.request(system_size=4, dataset='tmy2', derate=0.77, lat=40, lon=-105)
>>> result.errors
[u'You have exceeded your rate limit. Try again later or contact us at http://developer.nrel.gov/contact for assistance']

All other service errors, such as connectivity are raised as request’s python library exceptions.

Tests

Unit tests are provided in test.py

Changelog

1.0.0 - First release

Author: Miguel Paolino <mpaolino@gmail.com>

Project details


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