Fewer no grid charge months

app/models/entsoe.rb

@@ -10,12 +10,14 @@ class Entsoe
 
   URL = 'https://transparency.entsoe.eu'
   
+  attr_accessor :no_grid_charge_months
   attr_reader :storage_cost
 
   def initialize(api_key = "c2287e07-0c26-4950-b430-22b7f75a8f2e")
     @api_key = api_key
     @kwh_prices = {}  
     @storage_cost = 0.05 # how much does it cost to store 1 kwh in battery
+    @no_grid_charge_months = [5,6,7] # months where we assume there is enough surplus from sun power
   end
   
   def price_at(formatted_hour)
@@ -42,8 +44,8 @@ class Entsoe
     sorted_prices = prices_at(date).to_a.sort_by(&:last) # sort according to price 
     highest_hour = sorted_prices.last[0] 
     
-    # From Apr-Oct: do not charge; every hour that has cost > 0 is a high_hour
-    if [4,5,6,7,8,9,10].include?(date.month)
+    # Some months: do not charge; every hour that has cost > 0 is a high_hour
+    if @no_grid_charge_months.include?(date.month)
       lowest_hour = "" # effectively no charging from grid
       high_hours = sorted_prices.select{|p| p[1] > 0}.to_h.keys
     else