No charging at some days

app/models/entsoe.rb

@@ -20,6 +20,7 @@ class Entsoe
   
   def price_at(formatted_hour)
     unless @kwh_prices.key?(formatted_hour)
+      p "Fetching Entsoe tariffs for %s" % formatted_hour
       @kwh_prices.merge!(query_day_ahead_prices(Date.parse(formatted_hour)))
     end
     @kwh_prices[formatted_hour]
@@ -45,6 +46,10 @@ class Entsoe
     charge_rate = sorted_prices.first[1] # assume we charge at lowest hour
     high_hours = sorted_prices.select{|p| p[1] > charge_rate + storage_cost}.to_h.keys
     
+    # reset lowest_hour (effectively not charging), when price difference smaller than storage_cost
+    highest_price  = sorted_prices.last[1]
+    lowest_hour = "" if (highest_price-charge_rate) < storage_cost
+    
     return lowest_hour,highest_hour,high_hours
   end