Controls the number of records returned in a single request. If no value is provided, per_page default will be 25 records. If a value is provided that is less than 1, then the default per_page of 25 will be used. While Enerflo does not enforce a max value, if your call is unsuccessful, try reducing your per_page value. (The payload size of installation records can vary. If the total API response exceeds 512mb the response will fail. This can easily be mitigated by paginating your responses.)