Question 1

What is EV charging billing integration?

Accepted Answer

EV charging billing integration is the connection between a charging platform and an operator's finance systems — the payment gateway, the accounting or ERP package, third-party settlement for site hosts and roaming partners, and GST e-invoicing. It covers how a metered session becomes a priced transaction, a captured payment, a journal entry and a compliant invoice — and how those four records are matched back against each other.

Question 2

Why don't kWh revenue and settled cash ever match exactly?

Accepted Answer

Because energy and money are measured differently. OCPP reports meter readings as integer watt-hours, so billable energy carries three decimals while currency carries two, and the rounding never nets to zero. Beyond that, aborted sessions deliver energy that is never captured, pre-authorisation holds capture at a different value from the hold, and chargebacks land in a later period than the session. A small, explainable variance is normal — reconciliation exists to explain it, not eliminate it.

Question 3

How often should a CPO reconcile charging sessions against payments?

Accepted Answer

Daily for session count and kWh against gateway authorisations and captures, which surfaces dead chargers and stuck sessions inside 24 hours. Weekly for captures against settlement files against invoices and IRNs — weekly rather than monthly, because from 1 April 2025 a business with ₹10 crore or more annual aggregate turnover cannot report an invoice older than 30 days to the Invoice Registration Portal. Monthly for revenue-share accruals and roaming CDR balances at close.

Question 4

What data must a charging platform expose for ERP integration?

Accepted Answer

At minimum: a per-session record with meter start and stop values and their timestamps, an immutable session ID that survives re-pricing and refunds, the tariff version applied, a session state distinguishing metered from priced from captured from settled, and exportable settlement reports by site, tariff and partner. On the API side: documented REST endpoints, webhooks for session start, stop and failure, idempotent writes, and credit notes issued without editing the original session.

Question 5

How is site-host revenue share calculated for a public charging station in India?

Accepted Answer

For public charging stations on government or public land, the Ministry of Power's revised consolidated guidelines set revenue sharing with the land-owning agency at a fixed ₹1 per kWh used for charging, payable quarterly, under an agreement that may initially run for 10 years; ₹1/kWh is also the floor price where such land is bid out. Because the rate is metered on energy dispensed rather than on cash collected, the payout must be computed from session meter data — a delivered session that was never collected still carries the obligation.

EV Charging Billing Integration: Wiring Charging Revenue Into Your Finance Stack

Why Open APIs Are Critical For Modern EV Charging Businesses

erp integration

EV Charging Billing Integration: Wiring Charging Revenue Into Your Finance Stack

Why Open APIs Are Critical For Modern EV Charging Businesses