Growatt MAX 50-80KTL3 LV

Compatibility

Documented MAX monitoring starting map

Growatt’s manufacturer-authored V1.24 protocol lists MAX/TL3-X and MAX 1500 V families, with common serial identity and first-group state, AC power and frequency registers. It does not enumerate every newer suffix. Use it as a best-effort starting revision: compare the returned serial and live values with the nameplate and local display once before expanding the point set.

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.

Connect it with

• 
  Modbus Interface ZMB-3X
  From €399 ex VAT Configure Modbus Interface
• 
  Gateway ZGW-20
  From €899 ex VAT Configure Gateway

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. Use the configured site framing and one polling master; Growatt V1.24 supplies the starting registers below.
• 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. Read identity, state and AC output

   Use the configured slave address and framing; the manual’s monitoring example runs at 38400 baud. Read FC03 holding 23–27 for the serial, then FC04 input 0 for state and 35–37 for AC power/frequency. Exact PDUs and integer decoding appear below. Compare with the local display; check polarity, addressing and bus ownership first if the serial fails.

4. Compare inverter and site measurements

   Compare the starting reads with fresh values on the local display or existing logger. Record timeouts as unavailable rather than zero production. A separate point-of-connection meter supplies site import/export; inverter AC output measures generation.

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?

Growatt V1.24 supplies a MAX starting map for serial, state, output power and frequency. Follow the worked read on an available RS485 chain through an isolated interface. The two sockets belong to the same bus, so coordinate with an existing ShineMaster rather than adding a second master.^1, 4

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