Vendor Teardown 08 — Sensors & Controls (Growlink)

Source: 07_pricing_offer.pdf (not in the equipment-spec images)

The vendor's automation stack is Growlink — a US-based commercial cultivation automation brand. The equipment spec tables (images 2–6) didn't mention controls at all; the pricing offer reveals an €11 346 line item for sensors and controls, which is ~14 % of the total build cost.

Pricing offer breakdown

Per flowering / vegetative / mothers room, the vendor bills the same Growlink stack (with minor sensor-count variations):

Per-room kit (flowering rooms each): 399 + 199 + 299 + 499 + (3 × 299) + 299 = € 2 592.

Vegetative room: 399 + 199 + 299 + 499 + (2 × 299) + 299 = € 2 293. Mothers room: same veg structure ≈ € 2 293. Dry room: Hub + Canopy LINK + Climalink + Relay LINK = € 1 396.

Plus 12 × M8 cables (5 m, 4-pin) @ €14.99 each = €179.88 connecting Terralink probes to hubs.

Grand total for controls: €11 345.88.

What Growlink actually is

Growlink is a real commercial brand used by small-to-mid US cannabis cultivation operators. It's above hobbyist TrolMaster Hydro-X in ambition, below commercial Argus or Priva in sophistication. Its main characteristics:

• Cloud-first architecture. The "LINK Hub" is a thin client that reports to Growlink's cloud for logic execution, logging, dashboards, and schedule pushes.
• Native sensor families (Canopy LINK, Terralink, Climalink) that plug into the hub via M8 connectors — proprietary, no third-party sensors.
• Mobile app + web dashboard. Real-time graphs, schedule management, alerts.
• Modular growth: add more Relay / Valve modules as you scale.

Findings

Finding 1 — Growlink is a cloud-dependent system

The LINK Hub stores schedules locally and will keep running if the internet drops, but:

• Schedule updates require cloud. If the customer needs to change an irrigation schedule during a grid outage or an ISP outage, they can't.
• Alerts travel via cloud. A sensor fault detected at 3 AM during a Maltese storm that takes down the ISP → no alert gets through → crop damage goes undetected until morning.
• Historical logging is in the cloud. Regulatory traceability (which Malta licensing will eventually require) depends on cloud uptime.
• Growlink company solvency is a single point of failure. If the brand pivots or shuts down the cloud service, the customer's LINK hubs turn into paperweights. There is precedent: Revolv, Insteon, and Wink all killed their clouds and bricked customer devices. Growlink is a small company; this is a real risk over a 5–10 year facility life.

Finding 2 — "Climalink with CO₂" implies CO₂ dosing but no tanks are billed

Each flowering, veg, mothers, and dry room gets a "Climalink with CO₂" at €499. The "with CO₂" naming means the controller has a CO₂ dosing output — a solenoid driver to open a CO₂ tank valve when PPM drops below setpoint.

But nowhere in the €82 584 offer is there a line item for:

• CO₂ tanks (typically 2× 50 kg liquid CO₂ per flowering room = ~€1 200/room including cradles and regulators)
• Pressure regulators
• Distribution lines
• Solenoids (the controller only has the output — the actual solenoid valve is separate)
• CO₂ PPM sensors (MH-Z19, Sensirion SCD4x, or equivalent)

Hidden scope gap: ~€1 500–3 000 for functional CO₂ enrichment on top of the €82 584.

Finding 3 — Terralink (VWC/EC/Temp) is the right tool, right count

The Terralink substrate probe measures volumetric water content, electrical conductivity, and temperature in the root zone. 3 probes per flowering room (one per table) is appropriate density for a commercial drain-to-waste grow — you catch a dying table before its runoff starts pulling the whole room's EC off.

Commercial equivalents:

• Aroya (Terra probe): €500–700/probe + cloud subscription
• TrolMaster RTI-W (wireless probe): €180–280/probe
• METER TEROS 12 (research-grade, direct to datalogger): €350–450/probe

At €299 per Terralink, Growlink is mid-range — more expensive than TrolMaster, much cheaper than Aroya. Defensible.

Finding 4 — Valve LINK for irrigation zones

Each room with drip irrigation gets 1× Valve LINK at €299. This drives 24 VAC solenoid valves for zone scheduling. Given 3 tables per flowering room but only 1 valve controller, each room runs a single irrigation zone — meaning all 3 tables get watered simultaneously with the same recipe. No per-table dosing differentiation.

For a uniform single-strain grow this is fine. If the customer wants to experiment with strains or cycle phases across tables, they need more Valve LINK modules.

Finding 5 — Dry room has controls but no humidification

Dry room gets a full Growlink kit (Hub + Canopy + Climalink + Relay, €1 396) but no humidification — only the 2 × 90 L/day dehumidifiers. For controlled slow-dry at 60 % RH, you normally want both dehumidification and humidification to hold a tight setpoint, because overnight the room gets too dry. The wheeled ultrasonic humidifier on the pricing offer is assigned to veg + flowering, not dry.

The dry room will undershoot RH on dry days — flowers crispy, terpenes volatilised, buyer pushes back on quality.

Finding 6 — No aggregation / facility-wide dashboard mentioned

Each room has its own LINK Hub. There is no "master controller" or single-pane-of-glass for the facility — the customer manages 5 separate room dashboards. Growlink's web portal can aggregate these, but each hub is its own logical island for local schedule execution. Compared to a TrolMaster Hydro-X Pro (single brain, multi-room expander modules) or an Argus facility system, this is fragmented.

Finding 7 — Total € 11 346 for automation is expensive for what it does

For comparison:

• TrolMaster Hydro-X Pro equivalent kit covering the same rooms + hardware-level alarms: €12 000–16 000 (more capable, single brain)
• Sonoff + Home Assistant DIY equivalent: €4 800 (03_automation_sonoff_ha.md)
• Argus / Priva commercial: €40 000+

Growlink at €11 346 sits in the middle where it's neither cheap nor top-tier — the worst of both worlds for a commercial facility: cloud dependency, unknown long-term vendor solvency, no local fallback, and still costs the same as a wired commercial system.

Confirmations still needed from vendor

1. What happens to the Growlink kit if Growlink the company discontinues the cloud service?
2. Is local-only operation actually supported for schedule execution, alerting, and logging?
3. Who provides L1 support when a LINK Hub goes offline at 3 AM in Malta?
4. Can Growlink integrate with the Autogrow IntelliDose, or do they run as two separate control islands the grower has to manually keep in sync?
5. Where are the CO₂ tanks, regulators, and PPM sensors in the quote — implicit or genuinely missing?
6. Are sensors (Canopy LINK, Terralink) calibratable on-site, or factory-only?
7. Firmware update policy — forced OTA, or pinned to a version?