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SolarCalculator/asgi.py

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+"""
+ASGI config for SolarCalculator project.
+
+It exposes the ASGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/4.1/howto/deployment/asgi/
+"""
+
+import os
+
+from django.core.asgi import get_asgi_application
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'SolarCalculator.settings')
+
+application = get_asgi_application()

SolarCalculator/forms.py

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+from django import forms
+from material import *
+
+class SolarForm(forms.Form):
+    name = forms.CharField(required=True, label="Name", initial='Mr.ABC')
+    kw_installed = forms.FloatField(required=True, label="KW Installed", min_value=0, max_value=1e100, initial=4.81)
+    initial_cost = forms.IntegerField(required=True, label="Initial Cost of Installation", initial=415000)
+    amc = forms.IntegerField(required=True, label="Annual Recurring Cost", initial=9000)
+    units1 = forms.IntegerField(required=True, label="Units Consumed (Jan-Feb)", initial=1200)
+    units2 = forms.IntegerField(required=True, label="Units Consumed (Mar-Apr)", initial=1600)
+    units3 = forms.IntegerField(required=True, label="Units Consumed (May-Jun)", initial=1800)
+    units4 = forms.IntegerField(required=True, label="Units Consumed (Jul-Aug)", initial=1400)
+    units5 = forms.IntegerField(required=True, label="Units Consumed (Sep-Oct)", initial=1600)
+    units6 = forms.IntegerField(required=True, label="Units Consumed (Nov-Dec)", initial=1000)
+
+    layout = Layout(
+               Row('name', 'kw_installed', 'initial_cost', 'amc'),
+               Row('units1', 'units2', 'units3', 'units4', 'units5', 'units6'),
+               )

SolarCalculator/settings.py

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+"""
+Django settings for SolarCalculator project.
+
+Generated by 'django-admin startproject' using Django 4.1.2.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/4.1/topics/settings/
+
+For the full list of settings and their values, see
+https://docs.djangoproject.com/en/4.1/ref/settings/
+"""
+
+from pathlib import Path
+
+# Build paths inside the project like this: BASE_DIR / 'subdir'.
+BASE_DIR = Path(__file__).resolve().parent.parent
+
+
+# Quick-start development settings - unsuitable for production
+# See https://docs.djangoproject.com/en/4.1/howto/deployment/checklist/
+
+# SECURITY WARNING: keep the secret key used in production secret!
+SECRET_KEY = 'django-insecure-w&c9bz6fof7-amo)&tvl%9mcz_hl744sos5pv-q0#ua&kaspt_'
+
+# SECURITY WARNING: don't run with debug turned on in production!
+DEBUG = True
+
+ALLOWED_HOSTS = ['*']
+
+
+# Application definition
+
+INSTALLED_APPS = [
+    'django.contrib.admin',
+    'django.contrib.auth',
+    'django.contrib.contenttypes',
+    'django.contrib.sessions',
+    'django.contrib.messages',
+    'django.contrib.staticfiles',
+    # Installed Apps
+    'material',
+    'material.frontend',
+]
+
+MIDDLEWARE = [
+    'django.middleware.security.SecurityMiddleware',
+    'django.contrib.sessions.middleware.SessionMiddleware',
+    'django.middleware.common.CommonMiddleware',
+    'django.middleware.csrf.CsrfViewMiddleware',
+    'django.contrib.auth.middleware.AuthenticationMiddleware',
+    'django.contrib.messages.middleware.MessageMiddleware',
+    'django.middleware.clickjacking.XFrameOptionsMiddleware',
+]
+
+ROOT_URLCONF = 'SolarCalculator.urls'
+
+TEMPLATES = [
+    {
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'DIRS': [BASE_DIR / 'templates']
+        ,
+        'APP_DIRS': True,
+        'OPTIONS': {
+            'context_processors': [
+                'django.template.context_processors.debug',
+                'django.template.context_processors.request',
+                'django.contrib.auth.context_processors.auth',
+                'django.contrib.messages.context_processors.messages',
+            ],
+        },
+    },
+]
+
+WSGI_APPLICATION = 'SolarCalculator.wsgi.application'
+
+
+# Database
+# https://docs.djangoproject.com/en/4.1/ref/settings/#databases
+
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': BASE_DIR / 'db.sqlite3',
+    }
+}
+
+
+# Password validation
+# https://docs.djangoproject.com/en/4.1/ref/settings/#auth-password-validators
+
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
+    },
+]
+
+
+# Internationalization
+# https://docs.djangoproject.com/en/4.1/topics/i18n/
+
+LANGUAGE_CODE = 'en-us'
+
+TIME_ZONE = 'UTC'
+
+USE_I18N = True
+
+USE_TZ = True
+
+
+# Static files (CSS, JavaScript, Images)
+# https://docs.djangoproject.com/en/4.1/howto/static-files/
+# STATIC_ROOT = "/var/www/solarcalc.duckdns.org/static/"
+STATIC_URL = 'static/'
+
+# Default primary key field type
+# https://docs.djangoproject.com/en/4.1/ref/settings/#default-auto-field
+
+DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'
+SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO','https')
+
+CSRF_TRUSTED_ORIGINS=[
+    'https://solarcalc.duckdns.org',
+]

SolarCalculator/urls.py

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+"""SolarCalculator URL Configuration
+
+The `urlpatterns` list routes URLs to views. For more information please see:
+    https://docs.djangoproject.com/en/4.1/topics/http/urls/
+Examples:
+Function views
+    1. Add an import:  from my_app import views
+    2. Add a URL to urlpatterns:  path('', views.home, name='home')
+Class-based views
+    1. Add an import:  from other_app.views import Home
+    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
+Including another URLconf
+    1. Import the include() function: from django.urls import include, path
+    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
+"""
+from django.contrib import admin
+from django.urls import path
+from . import views
+
+urlpatterns = [
+    path('admin/', admin.site.urls),
+    path('', views.SolarCalculatorView, name='SolarCalculator'),
+]

SolarCalculator/views.py

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+# Create your views here.
+from django.http import HttpResponse, HttpResponseRedirect
+from django.shortcuts import get_object_or_404, render, reverse
+from django.template import loader
+import pandas as pd
+import numpy as np
+from .forms import *
+import io
+import numpy_financial as npf
+
+def PrC(units_consumed):
+    cutoff = 500
+    price_data1 = pd.DataFrame(np.array([[100, 0], [200, 2.25], [400, 4.5],
+                                         [500, 6]]),
+                               columns=['Unit_Ceiling', 'Rate'])
+
+    price_data2 = pd.DataFrame(np.array([[100, 0], [400, 4.5], [500, 6],
+                                         [600, 8], [800, 9], [1000, 10],
+                                         [np.inf, 11]]),
+                               columns=['Unit_Ceiling', 'Rate'])
+
+    if units_consumed < 0:
+        return 0
+    elif units_consumed > cutoff:
+        DB = price_data2
+    else:
+        DB = price_data1
+
+    DB['prev_slab'] = DB['Unit_Ceiling'].shift(1).fillna(0)
+    DB['cutoff'] = units_consumed - DB['prev_slab']
+    DB = DB.loc[DB['cutoff'] > 0, :].drop(['cutoff'], axis=1).reset_index(drop=True)
+    DB.at[DB.index[-1], 'Unit_Ceiling'] = units_consumed
+
+    bill = np.sum((DB['Unit_Ceiling'] - DB['prev_slab']) * DB['Rate'])
+    return bill
+
+
+def SolarCalculatorView(request):
+    if request.method == 'GET':
+        form = SolarForm()
+
+        return render(request, 'Input.html', {
+            'form': form,
+            'Title': 'TNEB Solar Returns Calculator'
+        })
+    else:
+        # A POST request: Handle Form Upload
+        form = SolarForm(request.POST)  # Bind data from request.POST into a PostForm
+
+        name = request.POST.get('name', '')
+        kw_installed = float(request.POST.get('kw_installed', ''))
+        initial_cost = int(request.POST.get('initial_cost', ''))
+        amc = int(request.POST.get('amc', ''))
+        units1 = int(request.POST.get('units1', ''))
+        units2 = int(request.POST.get('units2', ''))
+        units3 = int(request.POST.get('units3', ''))
+        units4 = int(request.POST.get('units4', ''))
+        units5 = int(request.POST.get('units5', ''))
+        units6 = int(request.POST.get('units6', ''))
+
+        # Savings Calculator
+        SolarSavings = pd.DataFrame([units1 + units2 + units3 + units4 + units5 + units6]
+                                    , columns=['Units Consumed'])
+        SolarSavings['Solar Units Generated'] = kw_installed * (4 * 6 + 3.5 * 4 + 3 * 2) * 30
+        SolarSavings['Bill Without Solar'] = PrC(units1) + PrC(units2) + PrC(units3) + PrC(units4) + PrC(units5) + PrC(
+            units6)
+        SolarSavings['Gross Bill With Solar'] = PrC(units1 - kw_installed * 3.5 * 60) + \
+                                         PrC(units2 - kw_installed * 4 * 60) + \
+                                         PrC(units3 - kw_installed * 4 * 60) + \
+                                         PrC(units4 - kw_installed * 4 * 60) + \
+                                         PrC(units5 - kw_installed * 3.5 * 60) + \
+                                         PrC(units6 - kw_installed * 3 * 60)
+        SolarSavings['Network Charges'] = SolarSavings['Solar Units Generated'] * .6 * .85
+        SolarSavings['Net Bill With Solar'] = SolarSavings['Gross Bill With Solar'] + SolarSavings['Network Charges']
+        SolarSavings['Annual Savings'] = SolarSavings['Bill Without Solar'] - SolarSavings['Net Bill With Solar']
+
+        # Cashflow at Inflation 4%, 6%, 8%
+        Cashflow = pd.DataFrame(list(range(1, 26)), columns=['Year'])
+        Cashflow['Investment & Charges'] = amc*1.0
+        # Initial Charges
+        Cashflow.loc[-1] = [0, initial_cost]
+        Cashflow.index = Cashflow.index + 1  # shifting index
+        Cashflow.sort_index(inplace=True)
+
+        Cashflow['Annual Savings'] = SolarSavings['Annual Savings'][0]
+        Cashflow.loc[0, 'Annual Savings'] = 0
+        Cashflow['Net Cashflow'] = Cashflow['Annual Savings'] - Cashflow['Investment & Charges']
+        Cashflow['4% Inflation'] = Cashflow['Annual Savings']*(1.04 ** Cashflow['Year']) - \
+                                   Cashflow['Investment & Charges']*(1.04 ** Cashflow['Year'])
+        Cashflow['6% Inflation'] = Cashflow['Annual Savings']*(1.06 ** Cashflow['Year']) - \
+                                   Cashflow['Investment & Charges']*(1.06 ** Cashflow['Year'])
+        Cashflow['8% Inflation'] = Cashflow['Annual Savings']*(1.08 ** Cashflow['Year']) - \
+                                   Cashflow['Investment & Charges']*(1.08 ** Cashflow['Year'])
+
+        P4Inf = pd.DataFrame(['4% Inflation'], columns=['Scenario'])
+        P4Inf['25 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['4% Inflation']), 4))
+        P4Inf['20 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['4% Inflation'][:21]), 4))
+        P4Inf['15 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['4% Inflation'][:16]), 4))
+        P4Inf['10 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['4% Inflation'][:11]), 4))
+        P4Inf['Payback Period'] = '{0} years'.format(len(np.cumsum(Cashflow['4% Inflation']
+                                                                   [np.cumsum(Cashflow['4% Inflation']) < 0])))
+        P4Inf['NPV @ 7% FD'] = "{:,.0f}".format(round(npf.npv(.07, Cashflow['4% Inflation']), 4))
+
+        P6Inf = pd.DataFrame(['6% Inflation'], columns=['Scenario'])
+        P6Inf['25 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['6% Inflation']), 4))
+        P6Inf['20 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['6% Inflation'][:21]), 4))
+        P6Inf['15 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['6% Inflation'][:16]), 4))
+        P6Inf['10 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['6% Inflation'][:11]), 4))
+        P6Inf['Payback Period'] = '{0} years'.format(len(np.cumsum(Cashflow['6% Inflation']
+                                                                   [np.cumsum(Cashflow['6% Inflation']) < 0])))
+        P6Inf['NPV @ 7% FD'] = "{:,.0f}".format(round(npf.npv(.07, Cashflow['6% Inflation']), 4))
+
+        P8Inf = pd.DataFrame(['8% Inflation'], columns=['Scenario'])
+        P8Inf['25 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['8% Inflation']), 4))
+        P8Inf['20 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['8% Inflation'][:21]), 4))
+        P8Inf['15 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['8% Inflation'][:16]), 4))
+        P8Inf['10 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['8% Inflation'][:11]), 4))
+        P8Inf['Payback Period'] = '{0} years'.format(len(np.cumsum(Cashflow['8% Inflation']
+                                                                   [np.cumsum(Cashflow['8% Inflation']) < 0])))
+        P8Inf['NPV @ 7% FD'] = "{:,.0f}".format(round(npf.npv(.07, Cashflow['8% Inflation']), 4))
+
+        Metric = pd.concat([P4Inf, P6Inf, P8Inf], axis=0, ignore_index=True)
+
+        # , '20 YEAR IRR', '15 YEAR IRR', '10  YEAR IRR', 'Payback Period',
+        # 'Discounted Payback'
+        # round(np.irr(Cashflow['Net Cashflow']), 2)
+        pd.options.display.float_format = '{:,.0f}'.format
+
+        buf = io.StringIO()
+        Metric.to_html(buf, escape=False, index=False, classes='" id = "table0')
+        Metric_HTML = buf.getvalue()
+
+        buf = io.StringIO()
+        Cashflow.to_html(buf, escape=False, index=False, classes='" id = "table1')
+        Cashflow_HTML = buf.getvalue()
+
+        buf = io.StringIO()
+        SolarSavings.to_html(buf, escape=False, index=False, classes='" id = "table2')
+        SolarSavings_HTML = buf.getvalue()
+
+        # IRR at 25, 20, 15, 10 Years
+
+        # Discounted Payback Period & Payback Period
+        return render(request, 'Output.html', {
+            'form': form,
+            'Title': f'Analysis of Investment in Solar Installation for {name}',
+            'DF_0': Metric_HTML,
+            'DF_1': Cashflow_HTML,
+            'DF_2': SolarSavings_HTML,
+        })

SolarCalculator/wsgi.py

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+"""
+WSGI config for SolarCalculator project.
+
+It exposes the WSGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/4.1/howto/deployment/wsgi/
+"""
+
+import os
+
+from django.core.wsgi import get_wsgi_application
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'SolarCalculator.settings')
+
+application = get_wsgi_application()