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SolaX X3 Ultra Hybrid 3 Phase Inverter - Buy to Order
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SolaX X3 Ultra Hybrid 3 Phase Inverter - Buy to Order

X3-ULTRA-25
£2,680.56 ex VAT £3,216.67 inc VAT

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Secure Checkout 14-Day Returns Tracked Delivery
High Conversion EfficiencyMore of your solar reaches the home
MPPT TrackingMaximises yield in changing light
Grid CompliantMeets UK G98 / G99 requirements
Technical Specifications
Rated Power (Pmax)25,000 VA
Module Efficiency98.0 %
Battery Voltage120 - 800 V
MPPT Quantity3
Min MPPT Voltage160 V
Max MPPT Voltage950 V
Max Input Voltage1,000 V
Max DC Power50,000 W
Max AC Power (5 min)27,500 VA
Max DC Current36 / 36 / 36 A
Max DC Inputs6
Height526 mm
Width696 mm
Depth240 mm
Weight47 kg
Operating Temperature-35 °C to +60 °C, derating above +45 °C
View Full Datasheet

SolaX X3 Ultra Hybrid 3 Phase Inverter - Buy to Order

SolaX · X3-Ultra

SolaX X3 Ultra Hybrid 3 Phase Inverter - Buy to Order

SolaX X3-Ultra — 36 A per tracker and 200 % PV input — the commercial end of the SolaX range.

A hybrid inverter does three jobs a string inverter cannot. It converts solar DC to AC; it charges and discharges a battery on the DC side, which avoids the double conversion an AC-coupled battery pays for; and when the grid fails it islands the house and keeps the EPS output alive from the battery.

Rated AC output
25,000 VAThree phase on-grid output
Backup output
25,000 VAContinuous EPS power in a grid outage
Maximum PV input
50,000 WArray size this inverter accepts
Battery window
120 – 800 VThe architecture it takes
MPP trackers
3Independent roof planes
Peak efficiency
98.0 %Conversion efficiency at best
Overview

About the SolaX X3-Ultra

The X3-Ultra is built for commercial and industrial work: 36 A per MPP tracker, up to 200 % PV oversizing, and 60 A of battery current across two ports. On the 25 kW that is 50 kWp of array on one inverter.

It is microgrid ready and balances power between a PCS and the hybrid in real time, supports 7×24 scheduling and is VPP ready through SolaX Cloud, with AI forecasting of generation and consumption.

IP66, smart cooled, 696 × 526 × 240 mm and 47 kg.

Battery compatibility

Which battery does this inverter take?

This inverter takes SolaX Triple Power HV, high voltage lithium.

This model has a battery voltage window of 120 – 800 V, a maximum charge or discharge current of 60 A (30 A × 2).

This rule applies to the SolaX X3-Hybrid G4 (180 – 650 V), X3-Hybrid Pro G4 and X3-Ultra (120 – 800 V).

Heated LFP modules, one master plus slaves. The window and the maximum current differ between the three X3 platforms, so read the figure in this model's own specification above.

What we stock that fits this inverter:

SolaX Triple Power HV 5.8kWh Heated LFP Main Battery MASTER V3The master module every HV stack starts with.
SolaX Triple Power HV 5.8kWh Heated LFP Extension Battery SLAVE V3Extension module; add to the master to build the stack.
The three X3 platforms do not share one battery window: the X3-Hybrid G4 is 180 – 650 V, the X3-Hybrid Pro and X3-Ultra are 120 – 800 V, and the single-phase X1-Hybrid G4 is 80 – 480 V. Size the stack against the inverter in front of you, not against the brand name.
For the installer

String design, battery limits and what is in the box

The details that decide whether this unit suits the job:

  • Battery is lithium-ion, 120 – 800 V, 60 A total across two ports (30 A × 2).
  • The 25 kW has three MPP trackers with two strings each, 36 A per tracker and 45 A Isc, on a 160 – 950 V MPPT window with a 200 V start-up and 1,000 V maximum.
  • Where both strings share one MPPT the maximum per string is 18 A; a single string on its own MPPT may take 20 A.
  • Maximum recommended PV array and maximum input DC power are both 50,000 W on the 25 kW — 200 % of rated.
  • Nominal AC output is 25,000 VA (24,900 under VDE 4105) with a maximum apparent power of 27,500 VA, and a rated current of 36.3 A.
  • EPS is twice rated power for 10 seconds, 25,000 VA rated, 36.3 A, switching in under 10 ms.
  • Efficiency: 98.0 % maximum, 97.7 % European, 99.9 % MPPT, with rated battery charge and discharge efficiencies of 98.5 % and 97.0 %.
  • 696 × 526 × 240 mm and 47 kg — plan the lift. IP66, smart cooling, transformerless.
Applications

Where this hybrid earns its place

The X3-Ultra is specified most often for these jobs.

Commercial and industrial storage25 kW with 50 kWp of array.
Microgrid sitesBalances power between a PCS and the hybrid in real time.
Peak shaving and scheduling7×24 scheduling mode.
Large mixed roofsThree trackers at 36 A each.
VPP and aggregator participationVPP ready through SolaX Cloud.
Backup for a whole unitTwice rated power for 10 seconds.
Before you order

Things worth knowing about this listing

These notes come from us and from the manufacturer, and they are the ones that most often cause a problem after delivery:
  • This is a Buy To Order product, part number X3-ULTRA-25.
Technical specification

SolaX X3-ULT-25K technical data

This model
Maximum PV array power50,000 Wp
Maximum PV input power50,000 W
Maximum input current36 / 36 / 36 A
Maximum short circuit current45 / 45 / 45 A
Number of MPP trackers3
Strings per MPP tracker2
Output, backup and performance
Rated AC output power25,000 VA
Maximum apparent AC power27,500 VA
Rated AC output current36.3 A
Maximum AC output current39.9 A
Maximum AC input power (grid charging)25,000 VA
Maximum AC input current36.3 A
Backup (EPS) continuous power25,000 VA
Backup (EPS) maximum current36.3 A
Common to the range
Maximum DC voltage1,000 V
Nominal DC operating voltage600 V
MPPT operating voltage range160 – 950 V
Start output voltage200 V
Battery typeLithium-ion
Battery voltage range120 – 800 V
Maximum charge / discharge current60 A (30 A × 2)
Rated grid voltage3P4W, 400 / 230 V
Rated grid frequency50 / 60 Hz
Displacement power factor1 (−0.8 to 0.8)
THDi at rated power<3 %
EPS peak power2 × rated power for 10 s
EPS rated voltage and frequency400 / 230 V; 50 / 60 Hz
EPS switchover time<10 ms
EPS THDv at linear load<3 %
Internal consumption at night<5 W
MPPT efficiency99.9 %
Maximum efficiency98.0 %
European efficiency97.7 %
Rated battery charge efficiency98.5 %
Rated battery discharge efficiency97.0 %
Protection classIP66
Operating temperature range−35 °C to +60 °C, derating above +45 °C
Relative humidity0 – 100 %
Altitude<3,000 m
Storage temperature−40 °C to +70 °C
Dimensions (W × H × D)696 × 526 × 240 mm
Weight47 kg
CoolingSmart cooling
TopologyTransformerless
CommunicationModbus (RS485), meter (RS485), DI × 2, DO × 1
Surge protectionType II, DC and AC
AFCIOptional
Compliance and warranty
Grid connection standardsVDE 4105, G99, AS 4777, EN 50549, CEI 0-21, IEC 61727, PEA/MEA, NRS-097-2-1, RD 1699, TOR
Safety and EMCEN/IEC 62109-1/-2; EMC EN 61000-6-1/2/3/4, EN 61000-3-11/12, EN 55011, IEC 62920
WarrantySee the warranty document attached to this listing
Specification sourceX3-ULTRA three-phase datasheet
Goes with this

Ordered with this inverter more often than anything else

A hybrid is the middle of a system, not the whole of it. These are the parts our customers add most often:

Solax M3-40 Three Phase CT Energy MeterM3-40 three-phase CT meter. SolaX require a meter on every installation.
Solax X3 150kW EPS Parallel Box G2 - Buy to OrderX3 PBOX-150kW-G2: parallels up to ten hybrids for 150 kW.
SOLAX BMS Parallel Box G2 - T58 Batteries OnlyBMS Parallel Box G2, for paralleling T58 battery stacks.
Frequently asked questions

Questions we get asked about this inverter

How much PV can the 25 kW take?

50,000 W — 200 % of its rating — across three trackers at 36 A each. Watch the per-string limits: 18 A where two strings share a tracker, 20 A for a single string on its own tracker.

Which battery?

Lithium-ion inside 120 – 800 V, up to 60 A across two ports. The SolaX Triple Power HV line is the direct pairing.

Is it a three-tracker inverter?

On the 25 kW, yes: three trackers with two strings each. Smaller models in the range have two.

What is the EPS capability?

25,000 VA rated and twice rated power for ten seconds, at 36.3 A, switching in under 10 ms.

ClearRay Solar

Documents, advice and trade pricing

Every datasheet, certificate, installation manual and warranty document we hold for this product is in the Documents tab below. See the rest of our hybrid inverter range, our batteries and our solar panels, or email sales@clearraysolar.com if you would like us to check a battery pairing or a string design before you order.

High Efficiency 98.0 %More power from the same roof space

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Documents & Certificates
Data Sheet X3 Ultra
Shipping & Returns

Delivery times vary by region:

  • UK — 1-2 business days
  • Highlands & Islands — 1-2 business days

Returns accepted within 14 days of delivery for unused items in original packaging.