Growatt MAX 50-80KTL3 LV

Compatibility

Growatt monitoring topology documented; third-party read unverified

The January 2024 manual describes two RS-485 ports, up to 32 inverters on a monitored chain, and a ShineMaster at its end. It gives electrical and bus details but no firmware-matched third-party inverter register map, independent-client coexistence rule or Edge acceptance result.

Standard MAX 50KTL3 LV, 60KTL3 LV, 70KTL3 LV and 80KTL3 LV only. Record exact nameplate, firmware, country grid setting, ShineMaster or USB logger and the occupied RS-485/DRMS terminals. MAX 60-100KTL3 MV, MAX 100-150KTL3-X/X2 and similarly named XL families have separate electrical and interface scopes.

Models

Specifications

The May 2026 datasheet lists MAX 50, 60, 70 and 80KTL3 LV at nominal 230/400 V. The 50 and 60 kW units have six MPPTs; the 70 and 80 kW units have seven. Two strings per tracker yield twelve or fourteen string inputs respectively. The named MV units in the broader manual use different AC voltages and are excluded.^1, 2

Exact LV ratings

MAX 50, 60, 70 and 80KTL3 LV; nominal 50, 60, 70 and 80 kW AC²

AC connection

Three phase, 230/400 V nominal, 3W+N+PE; country grid settings can alter allowed ranges²

PV trackers

Six MPPTs on 50/60 kW; seven on 70/80 kW; two strings per tracker^1, 2

PV input limits

1100 V maximum DC; 200-1000 V MPPT range; 26 A maximum input and 32 A short-circuit current per tracker²

RS-485 chain

Two ports; manual states up to 32 inverters, 500 m and 38,400 baud for its monitoring topology¹

Monitoring accessories

ShineMaster chain logger; optional USB-A ShineWiFi, Shine4G, ShineLan or ShineLink variants in the manual^1, 3

DRMS

Six-pin connector with four relay inputs, REF/GEN and DRM0/COM¹

Enclosure

860 × 600 × 300 mm; IP65; -25 to +60 °C operating range²

Interface

Documented measurements and integration boundaries for MAX 50-80KTL3 LV.

• Section 6.3.1 of the manual describes RS-485 monitoring for one or several inverters, with a maximum of 32 inverters, 500 m total distance and a stated 38,400 baud rate. These are Growatt topology limits, not independent-client or Modbus compatibility guarantees.
• Two RS-485 ports permit a daisy chain, whose end the manual connects to ShineMaster. Check existing termination, shield and grounding before adding equipment. A USB-A ShineWiFi, 4G or LAN accessory is a separate monitoring path.
• The manual's DRMS connector has relay contact inputs DRM1/5 through DRM4/8, REF/GEN and DRM0/COM. A dry-contact grid response is not a generic VPP command or register-write interface.
• Growatt says a smart meter and environmental monitor on its monitoring system must be from its designated manufacturers. A meter's own protocol and register addresses do not define an inverter telemetry endpoint.
• Inverter AC output is not site import or export. A point-of-connection meter must be identified and checked for CT ratio, phase orientation, interval and sign before reporting self-consumption or export.

Setup

1. Identify the exact LV variant

   Record the 50, 60, 70 or 80 kW nameplate, firmware and country grid code. Verify 400 V-class LV equipment rather than a MAX MV or X/X2 relative.

2. Map the monitoring chain

   Trace both RS-485 ports, device addresses, line termination, shield/grounding and the ShineMaster or other accessory. Record whether a USB monitoring module is also fitted.

3. Obtain the external read specification

   Ask Growatt or the plant integrator for a firmware-matched protocol specifying the permitted endpoint, master/client ownership, function codes, addresses, data types, scaling, update frequency and coexistence with ShineMaster.

4. Define independent measurement acceptance

   With a documented read path, compare PV power, energy and state at the inverter against the local Growatt display or logger. Verify timestamps, stale data and alarms. Use a separate site meter for import and export.

5. Keep plant control commissioned

   Leave DRMS, export limitation and grid protection under the approved electrical design. Any flexibility dispatch requires a distinct command contract, authority, acknowledgement and fail-safe response.

Common questions

Can Edge read a MAX LV directly over RS-485?

The manual provides an RS-485 monitoring topology but does not provide a third-party inverter register map or client coexistence rules. Obtain those documents for the installed firmware before proposing an Edge read.¹

Does ShineMaster's Ethernet connection mean Modbus TCP is available?

No local Modbus TCP service is established by the retained manual. ShineMaster is described as collecting inverter data and uploading it over a network. Its own supported third-party interface needs separate documentation.¹

Can the DRMS inputs provide VPP dispatch?

DRMS is a commissioned dry-contact grid-response function. A VPP control design requires documented signals, priority, permissions, feedback and loss-of-communications behavior; the contacts alone do not supply that contract.¹

Are 50 and 80 kW MAX LV units electrically interchangeable?

No. The current datasheet gives six trackers and twelve strings for 50/60 kW, versus seven trackers and fourteen strings for 70/80 kW, with different AC currents and PV sizing. Check the exact rating and country rules.²