General Details

SOLO 250

This high-quality  photovoltaic SOLO 250 inverter is intended for feeding photovoltaic energy into the public grid with a very high efficiency. Through the liquid cooling of the inverter heat is taken out efficiently from the operating room.
The SOLO 250 photovoltaic inverter series with liquid cooling is used in grid connected photovoltaic applications.

Techical Info
Type / Model SOLO 250 / ISC-40-3x22
Grid Data
Nominal AC power (P AC )250 kW
Maximum AC power275 kWAt ambient temperature T amb < 45 °C
AC operating voltage (U AC )400 V+10 % / -15 %
AC nominal current (I AC )360 A
Grid frequency (f AC )50 Hz±10 %, Option: 60 Hz
Grid structureIT
Surge protectionYes
Harmonic distortion (%THD I AC )< 3 %
Power factor (cos φ)–0.9 … +0.90.9 capacitive … 0.9 inductive
Note: P-Q capability curve available on request
Max. efficiency98.0 %
Euro eta97.7 %
Auxiliary power supply
(either external or generated internally)
230 V AC
50 Hz
+10 % / -15 %; TN-S; surge protection type 2
Option: 60 Hz
Max. auxiliary power
5W/650WAt standby / At full power
Note: Depending on the type of the string boxes used, they may have additional consumption.
Photovoltaic Data
Nominal PV power (P PV )255 kW
Control strategyMPPTMaximum Power Point Tracking
Number of PV inputs


Each PV input has its own MPP tracker

Max. DC current on each PV input220 A
DC voltage range for MPPT350 … 800 V DCNote: reduced maximal power below U MPP 400V
Max. permissible PV voltage
(U PVmax )
900 V DCOn standby
Maximum PV voltage for operation start850 V DCOn standby
Voltage ripple U PP (PV input)< 3 %
Surge protection (PV input)Type 2 Monitored
Grounding (PV input)FloatingOption: connection to PV(-) or PV(+) input
User Interface
External emergency stop
24 V DC (±10 %)
20 mA, active high
Connect to dry contact:
Open -> E-stop active, closed -> E-stop inactive
Emergency stop
Dry contact:
Open -> E-stop active, closed -> E-stop inactive
Transformer ready
24 V DC (±10 %),
20 mA, active high
Connect to dry contact:
Open -> not ready, closed -> ready
Transformer stand by
24 V, max. 1 ADry contact:
Open -> stand by, closed -> operation
Inverter start / stop
24 V DC (±10 %),
20 mA, active high
Connect to dry contact:
Open -> stop, closed -> start
Communication interfaceEIA-485, EthernetOthers see under options
Data logger interfaceElectroinvent Web PortalOthers see under options
Power limitation control / BDEW directives: Grid monitoring (VDE-AR-N 4105) or Low Voltage Ride Through (LVRT), Fault Ride Through (FRT) / Potential Equalization Device (PED) – connecting PV(-) input to ground (earth fault monitoring and earth current measurement)
Communication: SCADA (Modbus RTU (EIA-485) and Modus TCP/IP), GSM or Ethernet
Data logger: SolarLog, Meteocontrol, others on request
Cabinet and Ambient Conditions
Dimensions (W x D x H)1040 x 846 x 1920mm
Weight (m) approx.650 kg
Ambient temperature range (T amb )–20 ... +45 °C
Humidity15 ... 95 %Non condensing
Enclosure type according to EN 60529IP54
Maximum elevation above sea level2000 m
CoolingLiquid cooledWith external heat exchanger
Coolant concentration–25 °Cwater 55 %, ethylene-glycol 45 %
Static pressure of coolant (p)2 bar (±0.5 bar)Above ambient pressure, at 20 °C
Heat Exchanger
Dimensions (W x D x H)695 x 310 x 563mm
Weight (m)18 kg
Air inlet temperature range (T hex )–20 ... +45 °C
Hose size (d)15 mm / 25 mm Inside diameter / Outside diameter
Hose length (l)10 mInverter to heat exchanger
Max. elevation above inverter level (h)9 mHeat exchanger top level – inverter bottom level
CE conformity / EMCYesEN 61000-6-2, EN 61000-6-4
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