Pricing

What "indicative" means

These are starting figures, not a fixed public price list, and we would rather say so than publish a number you later discover was conditional. What a fleet actually costs depends on how many customers and systems you carry and which capabilities you need. The figure is confirmed with you before anything is charged.

All prices exclude VAT at 19%.

Choosing between Starter, Pro and Enterprise

The practical dividing line is whether you are selling with Helios or only monitoring with it, and after that how large your customer book and your team are.

Starter covers the monitoring side: the fleet dashboard, customer management, system provisioning and lead management, for a limited number of customers, systems and users. If your goal is to stop logging into four manufacturer portals, this is the tier that does it.

Pro raises the customer and system limits and adds the commercial tooling — proposals with an ROI snapshot, the ROI calculator, white-label branding (your logo and colours, and your own email and document templates) so the customer-facing side carries your identity rather than ours, curtailment monitoring, advanced analytics and priority support. It also connects Helios to the rest of your business: invoices go to Xero or QuickBooks and payments recorded there come back, your 3CX phone system shows who is calling and logs every call on the customer, and the public API with webhooks feeds your own systems and automation tools.

Enterprise has everything in Pro, with no limit on customers or systems and room for a larger team. It includes every AI feature in the plan itself, where Starter and Pro switch them on one at a time as add-ons, and adds WhatsApp and Viber messaging through your own accounts. Its AI use draws on the same monthly allowance as any plan.

Every plan includes reading an uploaded EAC bill with AI. Invoicing, online card payments through your own Stripe or Viva Wallet account, and the accountant export are not extra on any of them.

Plans and prices are read live from the same source the application itself uses, so what you see here matches what you would see in the app rather than being a marketing copy of it that drifts.

Edge EMS sites

A site run by a Helios Edge EMS is billed per site, by the usable capacity of its battery, because that is what drives the work of supervising it. The EMS licence itself is perpetual: the monthly figure is platform access for the site — remote monitoring, alarms, configuration from the platform, platform updates, history and API access.

The EMS hardware and the integration work are scoped per project — battery and PV equipment differ enough that a per-unit price would be a guess. Tell us the equipment and we will scope it properly.

AI add-ons and the AI allowance

Each AI feature — the data assistant, inbox reply drafts, briefings, follow-up suggestions, lead signals, ticket triage, the battery opportunity radar, bill audit, the fleet briefing, the annual energy report, AI-assisted import, and connecting your own AI app — is an add-on an account admin switches on in Settings; on Enterprise they are all part of the plan. None of them has a price of its own. They all draw on one monthly AI allowance, so you are never charged twice for the same use.

Action counts are at the Low or Medium effort setting. At High effort the assistant moves to Anthropic’s most capable model and each question uses about two and a half times as much. Unused allowance does not roll over. Settings shows how much is used and when it resets.

The public API and webhooks

Installer Pro and Enterprise include the public API and webhooks: keys you create in Settings, each capped by a role and never able to do more than the person who made it, with IP allowlists, an expiry date and alerts to your account owners; OAuth access tokens for integrations that prefer them; and 20 webhook events, signed and sent only to endpoints that have proved they are yours. All your keys share a budget of 120 requests a minute. How the API and webhooks work, or go straight to the documentation at api.helios-energy.app/api/public/v1/docs.

How you actually start

Through a demo rather than a signup form. Accounts are set up with us rather than self-serve, which means a short call, a look at your fleet, and a recommendation on which plan fits — including telling you that Starter is enough when it is.

If your inverters are Huawei FusionSolar or SolarEdge, connection is well-trodden. For the other supported brands the integration is built and gets validated against your equipment when the first system connects — worth knowing in advance, because it shapes what the first week looks like.

Common questions about billing

More in the full FAQ.