Moving a Solar Customer From Construction Draws to an O&M Plan

An O&M agreement is often signed months before a project is actually commissioned, as part of the original project contract. Starting the recurring subscription on the signing date instead of the commissioning date is the most common mistake here, because it puts the first annual invoice on a date that has nothing to do with when the system actually went live. Set the subscription's start date, and its renewal anchor, to commissioning, not signing.

Most O&M pricing is set against installed capacity, a rate per kilowatt, calculated once and then billed as a flat annual or monthly amount. Both platforms handle this the same way: calculate the fee outside the platform based on capacity, then enter it as a fixed recurring price. Neither Stripe Billing nor Chargebee calculates a per-kilowatt fee from a system size field automatically, so this step happens in your own pricing worksheet before the subscription is created.

Monitoring is usually included in the O&M fee rather than billed separately, but showing it as its own line item on the invoice, at no additional charge, makes clear to the customer what the annual fee covers. This matters more than it sounds: an O&M invoice that just says one flat number for the year is an easy target when a customer questions the renewal price eighteen months later and doesn't remember what's included.

Because commissioning dates are spread across the year rather than clustering in January, O&M renewals for a growing EPC arrive on a rolling basis rather than all at once. Chargebee's renewal and dunning workflows are built around whatever anniversary date the subscription started on, so this happens without extra configuration. In Stripe Billing, the same behavior is available, but confirming that every subscription's renewal reminder is actually anchored to its own commissioning date, not a shared default, is worth checking during setup rather than after the first renewal is missed.

The moment a project moves from construction draws to O&M is exactly when it's easiest to lose track of a customer, because the people managing the construction side and the people managing recurring billing are often different teams. A short checklist, confirm commissioning date, confirm capacity-based price, create the subscription, confirm the first invoice date, closes that gap. Whichever platform you use, this handoff step matters more to getting O&M billing right than any feature difference between the two.

Use this handoff checklist when a project commissions:

1. Confirm the commissioning date and use it as both the subscription start and the renewal anchor, not the contract signing date.
2. Calculate the O&M fee outside the platform from installed capacity, then enter it as the fixed recurring price.
3. Create the subscription with monitoring shown as its own line item at no additional charge, so the customer sees what the fee covers.
4. Confirm the first invoice date lines up with the O&M anniversary, so renewals arrive on a rolling basis instead of clustering in January.

For an EPC with a handful of O&M contracts, Stripe Billing's flexibility is enough, and a developer can set each one up individually without much friction. Once the O&M book includes dozens of systems commissioned on different dates with different capacity-based prices, Chargebee's subscription management and renewal dashboards give whoever owns the O&M business a faster way to see what's coming due and what capacity-based pricing each account is on, without pulling a custom report to answer it.

A project with a tax equity or lending partner attached often carries reporting obligations tied directly to the O&M agreement staying current, proof that maintenance is being performed and paid for on schedule. Neither platform produces a lender-ready report on its own, but a clean, well-structured subscription history, one record per system, with commissioning date, capacity-based price, and payment status all visible, makes it far easier to pull that proof on request. Chargebee's account-level view tends to make this pull faster once the O&M book has grown past a handful of systems; in Stripe Billing, the same information exists, but assembling it into something a financing partner can review usually means exporting and formatting it first, which is worth doing once as a reusable template rather than rebuilding it from scratch every single time a new reporting request lands on the finance team's desk.