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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:19f2a8cb1c6de61d0a56800f8e56bd9bad7dc4e03b58a655a7a7ff910f23e6d6"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 6: Solar Photovoltaic Systems"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex6.1:Pg-162"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Given data :\n",
+      "import math\n",
+      "T=27 +273 # temperature converted in kelvin\n",
+      "NV=1e22 # effective density of states in valence band in cm^(-3)\n",
+      "NA=1e19 # acceptor density in cm^(-3)\n",
+      "k=8.629*10**(-5) # boltzmann constant in eV/K\n",
+      "EFV=k*T*math.log(NV/NA) # closeness of fermi level i.e Ef-Ev\n",
+      "print \"Closeness of fermi level with valence bond is\",round(EFV,4),\"eV\"\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Closeness of fermi level with valence bond is 0.1788 eV\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex6.2:Pg-165"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Given data :\n",
+      "E =2.42 # Band gap in eV\n",
+      "hc=1.24 # planck's constant * speed of light\n",
+      "# solution\n",
+      "Lambda=1.24/E # in micro-meter usinf eq 6.4\n",
+      "\n",
+      "print \"The optimum wavelength is \",round(Lambda,3),\" micro meter\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The optimum wavelength is  0.512  micro meter\n"
+       ]
+      }
+     ],
+     "prompt_number": 20
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex6.3:Pg-182"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Given data :\n",
+      "Pout=1*735 # motor power output in W\n",
+      "Peffi=0.85 # motor efficiency\n",
+      "cellarea=9*4*125*125e-6 # area in m^2 \n",
+      "Rad=1000 #incident radiation in kW/m^2\n",
+      "celleffi=0.12 # cell efficiency\n",
+      "\n",
+      "# soln.\n",
+      "Pin=Pout/Peffi # power req by motor in W\n",
+      "N=Pin/(Rad*cellarea*celleffi) # number of modules\n",
+      "\n",
+      "print round(N),\" number of modules are required\" \n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "13.0  number of modules are required\n"
+       ]
+      }
+     ],
+     "prompt_number": 22
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex6.4:Pg-185"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# given:\n",
+      "noMPPTpower=10*8 # power without MPPT in W from fig 6.25\n",
+      "MaxP=25*5 # maximum power by PV module in W from fig 6.25\n",
+      "effi=0.95 # efficiency of MPPT\n",
+      "MPPTcost=4000 # Cost in rupees\n",
+      "# Soln\n",
+      "Pact=MaxP*effi # actual power produced in W\n",
+      "Psurplus=Pact-noMPPTpower # Surplus power in W\n",
+      "t=MPPTcost/(3*Psurplus/1000) # time required in hours \n",
+      "print \"time required is \",round(t,2),\"hours\"\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "time required is  34408.6 hours\n"
+       ]
+      }
+     ],
+     "prompt_number": 24
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file