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EV charging billing software: from the kWh to the invoice

The charger only measures energy. Turning that number into money — a price, a payment, an invoice, a share for the site owner — is the job of the billing software. This is what that job involves and how askacharge.com does it.

askacharge.com · Billing · 29 October 2026

What billing software has to do

A charger sends the platform how much energy it delivered, when and with which card. Everything after that is billing, and it has five parts:

  1. A price for each session: per kWh, per hour, per session, or a mix; maybe different for each customer group or each hour of the day.
  2. Getting paid: by card on the spot, or added to a monthly invoice for a company account.
  3. Splitting the money when the charger sits on someone else's land: the site owner gets a share.
  4. The paperwork: invoices and receipts that are valid where you operate.
  5. Knowing your margin: what you charged, minus what the electricity cost you and the payment fees.

Tariffs

Getting paid

Invoices that are valid where you are

In Spain, every QR payment and every monthly invoice is registered automatically with the tax office: Verifactu (State tax agency) or TicketBAI (Bizkaia, Gipuzkoa and Araba), depending on where the operator is registered. Outside Spain, invoices carry your tax label and rate; filing is yours. Prices and invoices go out in your currency (euros, dollars, Canadian dollars, Colombian pesos…).

Your margin, per session and per charger

Each session stores what you charged, what the electricity cost you, the payment fee and what's left. Add what each charger cost to buy and install, and the platform tells you when it paid for itself — the real date, not a projection — and, separately, when it is expected to at the current pace. Sessions export to CSV or Excel for your accountant.

What it costs

What it doesn't do (yet)

It works with any charger that speaks OCPP 1.6J or 2.0.1. What a charge point management system does beyond billing.

Sources

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