Added system degradation rate to example

Using equation 2 from https://pubs.rsc.org/en/content/articlehtml/2011/ee/c0ee00698j#cit4
pvlib · eccoope · Mar 6, 2023 · Mar 6, 2023 · Mar 6, 2023 · Mar 7, 2023
commit 0541e5bf9b0d31a49a6510d3dafe38fc40306528
diff --git a/docs/examples/financial/lcoe_sam_validation.py b/docs/examples/financial/lcoe_sam_validation.py
@@ -123,8 +123,11 @@
 # Period of financial analysis
 n = 20

-# Assume constant AC production over analysis period
-production = np.full(n, annual_ac_output)
+# Assume system degradation rate is 1%
+sdr = 0.01
+
+# Apply degradation rate to AC production over analysis period
+production = np.array([annual_ac_output*(1 - sdr)**i for i in range(n)])

 # Total installed capital costs [$] *
 capex = 1119.82*installed_dc/1000