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ajay
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SolarCalculator/views.py
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150
SolarCalculator/views.py
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# Create your views here.
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from django.http import HttpResponse, HttpResponseRedirect
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from django.shortcuts import get_object_or_404, render, reverse
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from django.template import loader
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import pandas as pd
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import numpy as np
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from .forms import *
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import io
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import numpy_financial as npf
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def PrC(units_consumed):
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cutoff = 500
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price_data1 = pd.DataFrame(np.array([[100, 0], [200, 2.25], [400, 4.5],
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[500, 6]]),
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columns=['Unit_Ceiling', 'Rate'])
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price_data2 = pd.DataFrame(np.array([[100, 0], [400, 4.5], [500, 6],
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[600, 8], [800, 9], [1000, 10],
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[np.inf, 11]]),
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columns=['Unit_Ceiling', 'Rate'])
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if units_consumed < 0:
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return 0
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elif units_consumed > cutoff:
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DB = price_data2
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else:
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DB = price_data1
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DB['prev_slab'] = DB['Unit_Ceiling'].shift(1).fillna(0)
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DB['cutoff'] = units_consumed - DB['prev_slab']
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DB = DB.loc[DB['cutoff'] > 0, :].drop(['cutoff'], axis=1).reset_index(drop=True)
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DB.at[DB.index[-1], 'Unit_Ceiling'] = units_consumed
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bill = np.sum((DB['Unit_Ceiling'] - DB['prev_slab']) * DB['Rate'])
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return bill
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def SolarCalculatorView(request):
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if request.method == 'GET':
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form = SolarForm()
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return render(request, 'Input.html', {
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'form': form,
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'Title': 'TNEB Solar Returns Calculator'
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})
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else:
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# A POST request: Handle Form Upload
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form = SolarForm(request.POST) # Bind data from request.POST into a PostForm
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name = request.POST.get('name', '')
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kw_installed = float(request.POST.get('kw_installed', ''))
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initial_cost = int(request.POST.get('initial_cost', ''))
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amc = int(request.POST.get('amc', ''))
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units1 = int(request.POST.get('units1', ''))
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units2 = int(request.POST.get('units2', ''))
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units3 = int(request.POST.get('units3', ''))
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units4 = int(request.POST.get('units4', ''))
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units5 = int(request.POST.get('units5', ''))
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units6 = int(request.POST.get('units6', ''))
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# Savings Calculator
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SolarSavings = pd.DataFrame([units1 + units2 + units3 + units4 + units5 + units6]
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, columns=['Units Consumed'])
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SolarSavings['Solar Units Generated'] = kw_installed * (4 * 6 + 3.5 * 4 + 3 * 2) * 30
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SolarSavings['Bill Without Solar'] = PrC(units1) + PrC(units2) + PrC(units3) + PrC(units4) + PrC(units5) + PrC(
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units6)
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SolarSavings['Gross Bill With Solar'] = PrC(units1 - kw_installed * 3.5 * 60) + \
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PrC(units2 - kw_installed * 4 * 60) + \
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PrC(units3 - kw_installed * 4 * 60) + \
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PrC(units4 - kw_installed * 4 * 60) + \
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PrC(units5 - kw_installed * 3.5 * 60) + \
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PrC(units6 - kw_installed * 3 * 60)
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SolarSavings['Network Charges'] = SolarSavings['Solar Units Generated'] * .6 * .85
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SolarSavings['Net Bill With Solar'] = SolarSavings['Gross Bill With Solar'] + SolarSavings['Network Charges']
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SolarSavings['Annual Savings'] = SolarSavings['Bill Without Solar'] - SolarSavings['Net Bill With Solar']
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# Cashflow at Inflation 4%, 6%, 8%
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Cashflow = pd.DataFrame(list(range(1, 26)), columns=['Year'])
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Cashflow['Investment & Charges'] = amc*1.0
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# Initial Charges
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Cashflow.loc[-1] = [0, initial_cost]
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Cashflow.index = Cashflow.index + 1 # shifting index
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Cashflow.sort_index(inplace=True)
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Cashflow['Annual Savings'] = SolarSavings['Annual Savings'][0]
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Cashflow.loc[0, 'Annual Savings'] = 0
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Cashflow['Net Cashflow'] = Cashflow['Annual Savings'] - Cashflow['Investment & Charges']
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Cashflow['4% Inflation'] = Cashflow['Annual Savings']*(1.04 ** Cashflow['Year']) - \
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Cashflow['Investment & Charges']*(1.04 ** Cashflow['Year'])
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Cashflow['6% Inflation'] = Cashflow['Annual Savings']*(1.06 ** Cashflow['Year']) - \
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Cashflow['Investment & Charges']*(1.06 ** Cashflow['Year'])
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Cashflow['8% Inflation'] = Cashflow['Annual Savings']*(1.08 ** Cashflow['Year']) - \
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Cashflow['Investment & Charges']*(1.08 ** Cashflow['Year'])
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P4Inf = pd.DataFrame(['4% Inflation'], columns=['Scenario'])
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P4Inf['25 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['4% Inflation']), 4))
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P4Inf['20 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['4% Inflation'][:21]), 4))
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P4Inf['15 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['4% Inflation'][:16]), 4))
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P4Inf['10 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['4% Inflation'][:11]), 4))
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P4Inf['Payback Period'] = '{0} years'.format(len(np.cumsum(Cashflow['4% Inflation']
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[np.cumsum(Cashflow['4% Inflation']) < 0])))
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P4Inf['NPV @ 7% FD'] = "{:,.0f}".format(round(npf.npv(.07, Cashflow['4% Inflation']), 4))
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P6Inf = pd.DataFrame(['6% Inflation'], columns=['Scenario'])
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P6Inf['25 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['6% Inflation']), 4))
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P6Inf['20 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['6% Inflation'][:21]), 4))
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P6Inf['15 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['6% Inflation'][:16]), 4))
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P6Inf['10 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['6% Inflation'][:11]), 4))
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P6Inf['Payback Period'] = '{0} years'.format(len(np.cumsum(Cashflow['6% Inflation']
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[np.cumsum(Cashflow['6% Inflation']) < 0])))
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P6Inf['NPV @ 7% FD'] = "{:,.0f}".format(round(npf.npv(.07, Cashflow['6% Inflation']), 4))
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P8Inf = pd.DataFrame(['8% Inflation'], columns=['Scenario'])
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P8Inf['25 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['8% Inflation']), 4))
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P8Inf['20 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['8% Inflation'][:21]), 4))
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P8Inf['15 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['8% Inflation'][:16]), 4))
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P8Inf['10 Year Return'] = "{0:.2%}".format(round(npf.irr(Cashflow['8% Inflation'][:11]), 4))
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P8Inf['Payback Period'] = '{0} years'.format(len(np.cumsum(Cashflow['8% Inflation']
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[np.cumsum(Cashflow['8% Inflation']) < 0])))
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P8Inf['NPV @ 7% FD'] = "{:,.0f}".format(round(npf.npv(.07, Cashflow['8% Inflation']), 4))
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Metric = pd.concat([P4Inf, P6Inf, P8Inf], axis=0, ignore_index=True)
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# , '20 YEAR IRR', '15 YEAR IRR', '10 YEAR IRR', 'Payback Period',
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# 'Discounted Payback'
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# round(np.irr(Cashflow['Net Cashflow']), 2)
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pd.options.display.float_format = '{:,.0f}'.format
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buf = io.StringIO()
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Metric.to_html(buf, escape=False, index=False, classes='" id = "table0')
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Metric_HTML = buf.getvalue()
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buf = io.StringIO()
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Cashflow.to_html(buf, escape=False, index=False, classes='" id = "table1')
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Cashflow_HTML = buf.getvalue()
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buf = io.StringIO()
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SolarSavings.to_html(buf, escape=False, index=False, classes='" id = "table2')
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SolarSavings_HTML = buf.getvalue()
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# IRR at 25, 20, 15, 10 Years
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# Discounted Payback Period & Payback Period
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return render(request, 'Output.html', {
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'form': form,
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'Title': f'Analysis of Investment in Solar Installation for {name}',
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'DF_0': Metric_HTML,
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'DF_1': Cashflow_HTML,
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'DF_2': SolarSavings_HTML,
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})
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