Non-metered wireless system and method to render usage based invoices for storage tank consumables

A non-transitory computer readable medium containing instructions that when executed by a processor perform acts comprising:

• receiving and storing by a processor and storage device of a central server measurements of storage tank consumables from a remote system located at a storage tank;
• periodically calculating by the processor usage-based data for generating invoices for storage tank consumables based on sensor measurements representative of an estimated usage of the storage tank consumables;
• receiving and storing a fill value representing an actual usage reported to the central server when the storage tank is filled;
• reconciling by the processor the estimated usage with the actual usage by summing all estimated usages since a last fill of the storage tank, calculating a difference between the sum of the estimated usages and the fill value, and issuing a debit or credit based on the difference for reconciliation.

A system for managing usage of storage tank consumables in a storage tank, comprising:

• a central server comprising a processor and a database adapted to communicate with a processing device of a remote system associated with the storage tank through a communication interface, wherein the processed sensor measurements of the remote system are received by the central server for further processing and storage, wherein the further processing comprises executing a usage based billing process adapted to:
• periodically calculate usage-based data for generating invoices for storage tank consumables based on sensor measurements representative of an estimated usage of the storage tank consumables;
• receive and store a fill value representing an actual usage reported to the central server when the storage tank is filled;
• reconcile the estimated usage with the actual usage by summing all estimated usages since a last fill of the storage tank, calculating a difference between the sum of the estimated usages and the fill value, and issuing a debit or credit based on the difference for reconciliation.