Update app.py

app.py

@@ -34,30 +34,54 @@ df = load_data()
 def build_prompt(location, project_type, roof_size=None, desired_kwh=None, electricity_bill=None, ghi=None, solar_cost_per_kw=None):
     if project_type == "Rooftop Solar":
         prompt = f"""
-You are a solar project estimator tool. Based on the following details, calculate and return only the values without any extra description:
-Project Type: Rooftop Solar
-Location: {location}
-Roof size: {roof_size} sq meters
-Monthly electricity bill: ₹{electricity_bill}
-Average GHI: {ghi} kWh/m²/day
-Solar system cost per kW: ₹{solar_cost_per_kw}
-Respond strictly in this format (do not add anything extra):
+You are an AI-based solar project estimator.
+
+Use the following calculation methods:
+
+- Estimated system size (kW) = Roof size (sq meters) × 0.15
+- Estimated daily solar output (kWh) = System size (kW) × Average GHI (kWh/m²/day)
+- Total system cost (₹) = System size (kW) × Solar system cost per kW
+- Assume tariff rate = ₹7/kWh
+- Monthly savings (₹) = Estimated daily output × 30 × 7
+- Payback period (years) = Total system cost ÷ (Monthly savings × 12)
+
+Inputs:
+- Project Type: Rooftop Solar
+- Location: {location}
+- Roof Size: {roof_size} sq meters
+- Monthly Electricity Bill: ₹{electricity_bill}
+- Average GHI: {ghi} kWh/m²/day
+- Solar System Cost per kW: ₹{solar_cost_per_kw}
+
+Now, calculate and return strictly in this format:
 Estimated solar system size in kW: <value>
 Estimated daily solar output in kWh: <value>
 Total system cost in ₹: <value>
 Monthly savings in ₹: <value>
 Payback period in years: <value>
 """
-    else:  # Ground Mount Solar
+    else:
         prompt = f"""
-You are a solar project estimator tool. Based on the following details, calculate and return only the values without any extra description:
-Project Type: Ground Mount Solar
-Location: {location}
-Desired monthly solar production: {desired_kwh} kWh
-Monthly electricity bill: ₹{electricity_bill}
-Average GHI: {ghi} kWh/m²/day
-Solar system cost per kW: ₹{solar_cost_per_kw}
-Respond strictly in this format (do not add anything extra):
+You are an AI-based solar project estimator.
+
+Use the following calculation methods:
+
+- Required system size (kW) = Desired monthly solar production ÷ (30 × Average GHI)
+- Estimated daily solar output (kWh) = System size (kW) × Average GHI (kWh/m²/day)
+- Total system cost (₹) = System size (kW) × Solar system cost per kW
+- Assume tariff rate = ₹7/kWh
+- Monthly savings (₹) = Estimated daily output × 30 × 7
+- Payback period (years) = Total system cost ÷ (Monthly savings × 12)
+
+Inputs:
+- Project Type: Ground Mount Solar
+- Location: {location}
+- Desired Monthly Solar Production: {desired_kwh} kWh
+- Monthly Electricity Bill: ₹{electricity_bill}
+- Average GHI: {ghi} kWh/m²/day
+- Solar System Cost per kW: ₹{solar_cost_per_kw}
+
+Now, calculate and return strictly in this format:
 Required solar system size in kW: <value>
 Estimated daily solar output in kWh: <value>
 Total system cost in ₹: <value>
@@ -66,6 +90,7 @@ Payback period in years: <value>
 """
     return prompt
 
+
 # UI - Form for user input
 st.title("☀️AI-Based Solar Project Estimation Tool")
 st.write("### Enter Your Details Below:")