Halves
Typical payback period, compared to solar and battery alone
53% more
Annual financial benefit for customers, on a typical system
2×
Return on investment, compared to solar and battery without Sentinel™
2×
Long-term cumulative returns over 25 years, on a typical system
"We built Sentinel™ around the end customer. When they win, selling becomes effortless."
Sentinel™ is a customer-first platform. Every feature exists to improve the experience and financial return of the homeowner or business owner who invested in solar and storage.
That's not just an ethical position; it's your most powerful sales tool. When a customer can see exactly what their system is earning, and how much faster their payback is, the sale becomes a conversation about opportunity, not cost. Objections shrink. Referrals follow.
As a Sentinel™ partner, you're joining a platform built to make your customers genuinely better off, and to make that straightforward for you to demonstrate.
Sentinel™ changes your business from day one.
Sentinel™ delivers many key benefits to your business. It makes selling easier, dramatically reduces the resource you spend on after-sales support and much more. All of these benefits start immediately.
Sell more,
with less effort
Sentinel™ gives you a Financial Impact Report for every prospect, showing exactly what their system will earn with and without Sentinel. The payback period typically halves. The numbers do the selling for you.
Spend far less
on after-sales support
Sentinel™ monitors every system you've installed, 24/7, and resolves most faults remotely before the customer even notices. Fewer call-outs. Fewer support calls. Far less engineer time tied up in post-installation issues.
Higher value
per installation
Sentinel™ adds a premium tier to every proposal, raising perceived value and giving customers a clear reason to choose you over a competitor that may be quoting on hardware alone.
Continuous remote monitoring
Your customers' systems are watched around the clock. Generation, battery state, export earnings and system health are tracked in real time. Customers feel looked after, and that reflects on you.
Market trading
revenue
Sentinel™ participates in energy market trading on behalf of customers, generating revenue a standard solar and battery system simply cannot access. A genuine differentiator most installers cannot offer today.
Your existing base is an opportunity
Customers already on compatible systems can be activated on Sentinel through our bulk credit programme; from as little as £10 per system, giving you a compelling reason to re-engage your installed base.
Four steps.
No new hardware.
No change to your process.
You install the system as you always have. Sentinel™ connects, optimises, and monitors automatically.
Step 01
Continuous remote monitoring
No change to your process. Sentinel works with FoxESS inverters now, with Solis, Solax, Growatt and SigEnergy following shortly.
Step 02
Sentinel™ connects to the system
Our platform integrates with the inverter and battery to monitor generation, consumption, storage, and grid interaction in real time, 24/7.
Step 03
The system is continuously optimised
Intelligent scheduling, market signals and tariff data maximise self-sufficiency, boost export earnings and unlock market trading revenue, all automatically.
Step 04
Issues caught and often fixed remotely
Sentinel™ monitors system health 24/7. Many faults are resolved remotely before the customer even notices, significantly reducing your call-out burden.
Watch the Sentinel™ overview
A short explainer covering what Sentinel does, how it works for customers, and what it means for your business. Coming Soon.
Metric | Solar and Battery only | with Sentinel™ |
|---|---|---|
Annual bill savings | £2,428 | £2,768 |
Export income | £444 (SEG) | £1,001 (optimised) |
Peak shaving benefit | — | £481 |
Market trading revenue | — | £144 (net) |
Total annual benefit | £2,872 | £4,394 |
Payback period | 8 yrs 9 mths | 4 yrs 10 mths |
25-year cumulative return | £63,702 | £147,580 |
Rate of return | 11.90% | 25.30% |
+£1,323
Extra annual benefit from Sentinel
3 years,
11 months
Faster payback period with Sentinel
£83,878
More over 25 years vs without Sentinel
25.3%
ROI with Sentinel vs 11.9% without
Based on a 12kWp solar / 10.24kWh battery system, cost £23,294. Solar + Battery figures from OpenSolar. Sentinel uplift based on Joulen residential scenario benchmarks (March 2026). Trading revenues not guaranteed. Sentinel subscription (£199/yr) deducted from year 2 in cumulative figures. 7% energy inflation applied. Illustrative; individual results will vary.
What your customers
gain with Sentinel™
Real figures based on a 12kWp solar, 10.24kWh battery system. The difference is significant and demonstrable to every customer.
Pricing that makes the sale easy.
Sentinel's subscription is straightforward to present in any proposal. The first year is free, so customers see results before paying anything. From year two, the cost is a fraction of the value it delivers.
Every new Sentinel customer receives their first full year at no cost. The subscription begins from month 13, giving customers time to see their system performing and their savings building before they spend a penny.
24/7 system monitoring
Intelligent battery and export optimisation
Market trading revenue (net of fees)
Peak shaving and tariff management
Remote diagnostics and fault resolution
Customer dashboard and performance reporting
£19.99 per month
12 Months free for all new customers
The economics in plain terms. A typical customer gains over 50% more in annual financial benefit with Sentinel. The subscription from year 2 is £199. That is a return of more than 6 times the subscription cost, every single year. When you frame it that way in a proposal, the conversation shifts from cost to opportunity.
Partner activation
pricing.
Activating Sentinel for your customers is simple. Whether you are starting fresh or rolling it out across your existing base, we have pricing structured to work at any scale.
Standard activation
£100
per activation
(per new customer system)
For each new installation where you add Sentinel at point of sale. Covers the activation and onboarding of your customer onto the Sentinel platform, with their first year of subscription included at no extra charge.
Bulk activation credits
£10
per activation
(from £10 per system | volume pricing)
Already have customers on compatible systems? Partner installers can activate Sentinel across their existing base at significantly reduced cost through our bulk credit programme. As an example, activating 100 existing customer systems at £10 per activation rather than the standard £100 gives you a ready-made conversation with customers you have already served.
Volume tiers are confirmed as part of your partner agreement. Get in touch to discuss what makes sense for your portfolio.
No minimum volume. No exclusivity requirement. There is no obligation to commit to a specific number of activations to get started. Volume pricing on activation credits rewards installers who choose to roll Sentinel out across their portfolio.
What installers ask us.
The questions we hear most from installers exploring the Sentinel partner programme.
Sentinel™ is currently integrated with FoxESS inverters. Integration with Solis, Solax, Growatt and SigEnergy is in progress and coming soon. If your installations are predominantly on one of these brands, get in touch now and you'll be among the first to access those integrations as they go live.
No. Your installation process doesn't change at all. Sentinel™ connects to the inverter via its existing data interface: no additional hardware, no extra cabling, no change to your commissioning workflow. Activation is handled digitally after the system is live.
Sentinel™ monitors system performance 24/7 across generation, battery cycles, export behaviour, grid import and system health. When anomalies are detected, our team investigates and, in many cases, can resolve the issue remotely through configuration changes or inverter commands, without an engineer attending site. Where a visit is needed, you'll be alerted with diagnostic information already in hand, making the call-out faster and more efficient.
Sentinel™ participates in energy flexibility markets on behalf of customers, using the battery to respond to grid signals during peak demand periods. This generates income that goes directly to the customer, net of Joulen's platform fee. It's a revenue stream that a standard solar and battery system simply cannot access without intelligent management software. Trading revenues are not guaranteed but represent genuine additional upside in every customer's financial case.
Yes, and this is one of the most valuable aspects of the partner programme. Any existing customer with a compatible inverter and battery can be activated on Sentinel™. Through our bulk activation credit programme, partner installers can activate existing customers at significantly reduced cost; from as little as £10 per system at volume. It's a ready-made reason to re-engage your installed base with a compelling, proven upgrade.
We make this straightforward. Partner installers have access to the Sentinel™ Financial Impact Report, a branded output that shows a customer's specific system alongside a clear comparison of returns with and without Sentinel™. It covers annual savings, export income, payback period and 25-year cumulative returns. The numbers speak for themselves, and the report gives you a professional, credible leave-behind for every proposal conversation.
Becoming a Sentinel™ partner involves a straightforward agreement that covers activation pricing, support terms, and how the ongoing customer relationship works. There's no exclusivity requirement and no minimum volume to get started, though volume pricing on activation credits rewards installers who commit to rolling Sentinel™ out across their portfolio. We'll walk through everything on your discovery call.
Sentinel™ handles all platform-related support, including monitoring queries, performance questions, billing and anything related to the Sentinel software. You remain your customer's point of contact for hardware and physical installation matters. In practice, because Sentinel resolves most issues remotely, the volume of customer queries you receive post-installation reduces significantly.
No. Sentinel™ is being launched for both residential and commercial customers. If you install for businesses, schools or larger properties as well as homes, the financial case is often even more compelling at commercial scale. Tell us about your portfolio mix and we'll tailor the conversation accordingly.
Customers can cancel at any time. If they do, the system continues as a standard solar and battery installation; monitoring and optimisation features simply switch off. In practice, we expect very low churn. Once customers see the financial difference Sentinel™ makes, the £199/year subscription is very easy to justify. The annual benefit Sentinel™ delivers is typically more than 6 times the subscription cost.
