Solplanet 75-125K-LT with RS485 cable with GridZeno.

Solplanet 75-125K-LT with RS485 cable on the compatibility list, updated 31 October 2026.

• Live overview of solar, consumption and gridAll subscriptions · Solar production only.
  Works
• Battery state of chargeAll subscriptions · requires a battery · The grid inverter has no battery.
  Not possible
• Stop selling at negative pricesSmart and Pro · Requires the installer to have turned export limiting on in the inverter. GridZeno only lowers a limit that's already set. Solplanet's limit applies to the inverter's whole output, not just the export.
  Works
• Charge from the grid when power is cheapSmart and Pro · requires a battery
  Not possible
• Discharge the battery when power is expensivePro · requires a battery
  Not possible

Works: tested and measured on real hardware.

A grid inverter without a battery: GridZeno shows the solar production and lowers the inverter's output at negative prices.

Battery

None. The inverter is a grid inverter without a battery, so there's nothing to charge or sell from.

Stop selling at negative prices

The inverter's output is set quarter by quarter by the selling price, but only where the installer has turned the limit on. Solplanet's limit applies to the inverter's whole output, not just the sale to the grid. The dongle sets the installer's value back afterwards.

Grid and consumption

Not shown. A Solplanet grid inverter has no energy meter the dongle can read.

Manual

When the control is on Manual, the dongle changes nothing on the inverter. It reads, and if GridZeno has changed something, it puts the inverter's own settings back, including your own charge limits.

No storage block from input 1600, or the model code 1-5 in 31073: a three-phase grid inverter. The dongle treats it like the other ASW grid inverters.

The export limit

Lowered only when the installer has turned 44001 on. The installer's value in 45403 is given back exactly.

The sun

At most ten PV inputs are read, by the number of MPPTs in 31074.

How it differs from its neighbours

• Solplanet 45-60K-LT-G3 with RS485 cable: The 45-60K-LT-G3 is read the same way, but is connected with terminals A, B and G in COM2.

For the installer: the registers

What the dongle uses over Modbus, if you want to follow along or troubleshoot. Don't change the registers yourself while control is set to Automatic.

Identity

Input 1000-1029: 1000 is 3 on a three-phase unit, the model is in 1018-1025 and the rated power in 1027-1028. The model code in 31073: 1-5 are grid inverters, 11-16 hybrids.

Export limit

44001 is the installer's switch, 45403 the limit in 0.01 % of the rated power.

Address

3 from the factory, never 0.

From the dongle's firmware and our notes on each inverter, not from the datasheet.

Wires in the inverter's terminal plug. Approx. 30 minutes.

Port

COM2 (8-pin connector, for 3rd party)

Pin

A at pin 3 (RS485A), B at pin 4 (RS485B), GND at pin 2 (GND_SELV)

Where

On the underside of the inverter by COM1 (Ai-Dongle) and COM3. The connector is a waterproof connector with an 8-pin screw terminal inside.

See the full installation guide for Solplanet 75-125K-LT with RS485 cable

GridZeno Dongle for Solplanet 75-125K-LT with RS485 cable

This one works.

Solplanet 75-125K-LT with RS485 cable is the inverter GridZeno has been tested on. Check that your model is under ASW75K, 80K, 100K, 110K and 125K-LT. If it still doesn't suit you, you have 100 days' free return.