Victron 10kVA 48V Off-Grid Energy System with 28.8kWh LiFePO₄ Battery and 20kVA/30kVA Generator - No Solar Required

   
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Victron 10kVA 48V Off-Grid Energy System with 28.8kWh LiFePO₄ Battery and 20kVA/30kVA Generator – No Solar Required

  • Run suitable off-grid loads from battery power between generator charging sessions, without installing solar panels.
  • Supply 230V single-phase equipment through a Victron inverter rated at 10kVA / 8kW continuously at 25°C.
  • Store 28.8kWh nominal energy in six Pylontech LiFePO₄ batteries, paired with a selected 20kVA or 30kVA prime-rated Excel Power diesel generator.

Victron 10kVA off-grid energy system: battery and generator power without solar

This Victron 10kVA off-grid energy system combines a MultiPlus-II 48/10000/140-100 inverter-charger, six 4.8kWh Pylontech US5000-series batteries and a selected Excel Power diesel generator. The generator supports connected loads and recharges the batteries through the inverter-charger. When it stops, suitable loads continue to run from stored energy without requiring solar panels.

Key features

  • No solar required: an option where shading, restricted roof space, tenancy conditions or site layout make a solar array impractical.
  • Battery operation between charging sessions: run suitable loads without keeping the generator operating continuously. Actual generator hours depend on energy demand and charging requirements.
  • Managed generator loading: PowerControl manages charging demand within the configured input limit, while PowerAssist can supplement an accepted generator supply with battery power.
  • Modular lithium storage: six parallel-connected modules provide 28.8kWh nominal and 27.36kWh usable DC energy at the specified 95% depth of discharge. Delivered AC energy is lower.
  • System visibility: the proposed Cerbo GX and GX Touch 50 provide local monitoring, with access to Victron’s VRM platform when an internet connection is available.

Where to use

Consider this system for remote commercial offices, logistics-site equipment, rural workshops, agricultural outbuildings, communications installations and other premises without a suitable grid connection or solar installation.

Assess daily consumption, simultaneous running loads, motor-starting currents and power factor before specifying the package. Battery-only continuous output is 8kW at 25°C, 7kW at 40°C and 6kW at 65°C; the 18kW peak figure is not a continuous rating.

Choose your generator

20kVA option: Excel Power XL-DK-22S

This 230V single-phase generator is rated at 20kVA / 20kW prime and 22kVA / 22kW standby. It combines a water-cooled engine running at 1,500rpm, a DSE6120 controller and a 71.4-litre fuel tank. Standard electrical connection is hard-wired; sockets are optional.

30kVA option: Excel Power XL-DFAW-33S

The larger option is rated at 30kVA / 30kW prime and 33kVA / 33kW standby, with electronic governing, a water-cooled engine and a 75-litre fuel tank. It provides additional generator capacity for an appropriately designed site distribution arrangement, not a higher battery-only inverter rating.

The MultiPlus-II has a 100A maximum AC input and transfer-switch rating. Do not assume the complete 30kVA generator output can pass through the inverter’s AC input. Any additional generator-fed circuits require a separately designed distribution and protection arrangement.

How the system works

With the generator stopped, the inverter supplies suitable loads from the batteries. Once an acceptable generator supply is connected, the MultiPlus-II transfers to AC supply and uses available capacity for charging within the configured limits.

The 140A battery charger sets the maximum inverter charging current. A larger generator does not increase this limit. PowerAssist is a managed support function, not permission to add generator and inverter nameplate ratings together.

No solar required does not mean no energy input is required: generator fuel replenishes the battery bank. No fixed runtime, recharge time or fuel-saving percentage is claimed.

Proposed package contents

Installation and commissioning

This is a supply-only equipment package, not a plug-in installation. A qualified installer must design the battery distribution, generator connection, earthing, protective arrangements and load circuits. Energian can help arrange installation through trusted partners.

Automatic generator starting requires an approved connection to the generator controller, suitable settings and commissioning. An optional mains-failure ATS is not automatically a complete battery-state-controlled start system.

Install the inverter and batteries in suitable dry equipment accommodation. The attached Pylontech manual permits a maximum of three modules per bracket stack, so six modules require separate compliant stacks or an appropriately designed rack. Charging below 0°C is outside the attached manual’s operating range.

Operate combustion generators outdoors with safe exhaust clearances, away from doors, windows and air intakes. Both generator datasheets state “non-emissions-certified”; confirm lawful suitability for the intended duty and location before selection.

Technical specifications

Inverter figures follow the attached 48/10000/140-100 datasheet. Battery figures are per US5000 module unless stated otherwise; manual-specific operating limits are identified. Confirm the supplied hardware revisions and applicable documentation before commissioning.

Specification Value
System configuration
System type Single-phase, generator-charged off-grid battery system.
Solar requirement No solar panels required; no solar equipment included in this configuration.
Inverter-charger Victron MultiPlus-II 48/10000/140-100, 230V.
Battery configuration 6 × Pylontech US5000-series modules connected in parallel, not in series.
Nominal battery voltage 48V DC.
Nominal bank energy 28.8kWh, calculated as 6 × 4.8kWh.
Usable bank energy 27.36kWh DC, calculated as 6 × 4.56kWh, before conversion losses and operating reserves.
Generator alternatives Excel Power XL-DK-22S or XL-DFAW-33S, both 230V single-phase.
Proposed monitoring Victron Cerbo GX and GX Touch 50; final equipment schedule applies.
Installation format Supply-only components requiring professional installation and commissioning.
Overall weather protection No single system-wide IP rating claimed; individual component ratings and installation requirements apply.
Victron: inverter output
Continuous apparent output at 25°C 10,000VA.
Continuous active output at 25°C 8,000W.
Continuous active output at 40°C 7,000W.
Continuous active output at 65°C 6,000W.
Peak inverter power 18,000W. Duration is not specified in the supplied datasheet; not a continuous rating.
Output voltage 230V AC ±2%.
Output frequency 50Hz ±0.1%
Output waveform Sine wave.
DC input-voltage range 38–66V DC. Battery-specific operating limits take precedence.
Maximum inverter efficiency 96%.
Zero-load consumption 38W.
Zero-load consumption in AES mode 27W.
Zero-load consumption in Search mode 4W.
Maximum apparent feed-in power 10,000VA; this component rating does not establish permission for grid connection.
Transfer to inverter operation Less than 20ms
Load condition noted in datasheet Non-linear load, crest factor 3:1.
Victron: generator input and battery charging
AC input-voltage range 187–265V AC.
AC input-frequency range 45–65Hz.
Maximum AC input current 100A. The commissioned limit must not exceed generator, connection, cable or protective-device ratings.
Transfer-switch rating 100A.
Maximum battery charging current 140A, specified up to 25°C ambient; battery BMS and installation limits apply.
PowerControl Adjusts charging demand to respect the configured AC input-current limit.
PowerAssist Allows battery power to supplement an accepted AC input when enabled and correctly configured.
Main output, AC-out-1 Inverter-backed output for suitable loads.
Auxiliary output, AC-out-2 Available only when accepted AC input power is present.
Battery charging settings Configure for the installed Pylontech revision, compatible integration instructions and BMS limits. Do not use generic lead-acid equalisation.
Generator starter-battery charging Must be specified separately. Do not assume the 48V inverter provides a 12V starter-battery maintenance output.
Victron: control, communications and construction
VE.Bus Configuration, monitoring and system integration. No parallel or three-phase inverter arrangement is included in this package.
General-purpose communication ports 2.
Remote on/off Supported.
Programmable relay General alarm, DC undervoltage or generator start/stop signalling.
Inverter relay AC contact rating 230V AC / 4A; not a generator power-switching rating.
Inverter relay DC contact rating 4A up to 35V DC; 1A up to 60V DC.
Local configuration VEConfigure with a suitable computer and MK3-USB interface.
Remote platform Victron VRM through an internet-connected GX device.
Optional external AC current sensor 50A or 100A, as appropriate to the configuration; not assumed included.
Cooling Fan-assisted.
Operating temperature −40°C to +65°C; output derating applies.
Maximum humidity 95%, non-condensing.
Enclosure Steel, blue RAL 5012.
Inverter ingress protection IP22.
Battery terminals Four M8 bolts: two positive and two negative connections.
AC terminals M6 bolts.
Inverter dimensions, H × W × D 677 × 363 × 206mm.
Inverter weight 49kg.
Protection functions Output short circuit; overload; high/low battery voltage; overtemperature; external 230V on inverter output; excessive DC input ripple.
Safety references listed in supplied datasheet EN-IEC 60335-1; EN-IEC 60335-2-29; EN-IEC 62109-1; EN-IEC 62109-2.
Emission and immunity references EN 55014-1; EN 55014-2; EN-IEC 61000-3-2; EN-IEC 61000-3-3; IEC 61000-6-1; IEC 61000-6-2; IEC 61000-6-3.
UPS and anti-islanding approvals Refer to the applicable Victron certificates. Component references do not certify the assembled installation.
Pylontech US5000: battery performance
Battery chemistry Lithium iron phosphate, LiFePO₄ / LFP.
Nominal module voltage 48V DC.
Nominal module energy 4,800Wh / 4.8kWh.
Usable module energy 4,560Wh / 4.56kWh.
Depth of discharge 95%, with a compatible inverter following the applicable Pylontech protocol.
Charging-voltage range 52.5–53.5V DC; final setpoints must follow applicable integration instructions.
Maximum continuous charge/discharge current 100A per module. Temperature, BMS, cable and connector limits apply; this is not a guaranteed assembled-bank current rating.
Peak charge/discharge current, first band 101–120A per module for 15 minutes.
Peak charge/discharge current, second band 121–200A per module for 15 seconds.
Current-rating temperature qualification, attached manual Recommended and maximum continuous currents relate to cell temperatures of 10–40°C; derating applies outside this range.
Communications CAN and RS485.
CAN communication, attached manual 500kbps.
Battery-management functions Charge/discharge control, cell balancing and voltage, current and temperature protection.
Maximum modules per battery group 16 in the attached documents; this proposed package uses six.
Pylontech US5000: construction and installation
Module dimensions, W × D × H 442 × 420 × 161mm.
Battery ingress protection IP20.
Cooling Natural cooling.
Charging temperature, attached installation manual 0°C to +50°C.
Discharging temperature, attached installation manual −10°C to +50°C.
Installation ambient, attached manual 0°C to +50°C; optimal battery temperature stated as 10°C to 40°C.
Humidity 5–95% RH, non-condensing.
Installation location Indoors, dry, protected from water, direct sunlight and unsuitable temperatures.
Bracket-supported stacking limit Maximum three modules per stack in the attached manual. Six modules require separate compliant stacks or an appropriately designed rack.
Module connections Parallel connection only; do not connect these battery modules in series.
External battery cable kit Separate from the module carton. The manual rates each specified external cable pair at 100A continuous; sufficient approved cable pairs and protection are required.
External cable-kit length, attached manual Less than 3m for the specified kit; not a substitute for designing all inverter-side cable runs.
Disconnection-device voltage, attached manual At least 60V DC; an AC-only breaker is not suitable.
Protection selection Must account for inverter current, number and capacity of battery leads, battery fault current and the final distribution arrangement.
Design life More than 15 years at 25°C, as stated in the attached documents; not a warranty duration.
Cycle life More than 6,000 cycles at 25°C, as stated in the attached documents.
Battery references listed in attached manual IEC62619; IEC63056; UL1973; UL9540A; IEC61000-6-2; IEC61000-6-3; UN38.3. Confirm certificates applicable to the supplied revision and market.

Excel Power generator comparison

Specification 20kVA option 30kVA option
Model XL-DK-22S. XL-DFAW-33S.
Prime electrical rating 20kVA / 20kW. 30kVA / 30kW.
Standby electrical rating 22kVA / 22kW. 33kVA / 33kW.
Voltage and phase 230V, single-phase. 230V, single-phase.
Frequency 50Hz. 50Hz.
Engine manufacturer Depco. FAWE.
Engine model DEPCO-4R95. 4DX21-53D.
Governor Mechanical. Electronic.
Cylinders 4, in-line. 4, in-line.
Bore × stroke 95 × 100mm. 102 × 118mm.
Displacement 2.84 litres. 3.86 litres.
Aspiration Naturally aspirated. Naturally aspirated.
Engine cycle Four-stroke. Four-stroke.
Compression ratio 18.5:1. 17:1.
Cooling Water-cooled, engine-driven fan. Water-cooled, engine-driven fan.
Engine speed 1,500rpm. 1,500rpm.
Gross engine power 25kW. 39kW.
Fuel Diesel. Diesel.
Fuel consumption at 100% load 7.1 litres/hr. 8.1 litres/hr.
Fuel-consumption qualification Generator full-load figures, not the hybrid system’s average consumption. No 50%-load consumption figure is supplied.
Fuel-tank capacity 43 litres. 75 litres.
Fuel system Engine-driven injection pump with full-flow filters; water separator optional.
Alternator make Depco. Depco.
Alternator model DEPCO-20-1. DPC224D.
Bearing arrangement Single bearing. Single bearing.
Insulation class Class H. Class H.
Alternator ingress protection IP23. IP23.
Excitation Shunt. Shunt.
Voltage regulation AVR, ±1%. AVR, ±1%.
Controller Datacomm D100. Deep Sea Electronics DSE6120.
Exhaust system Residential-grade silencer within the canopy; lagged to limit heat transfer.
Mounting Engine and alternator supported on anti-vibration mounts.
Coupling Close-coupled with SAE semi-flexible flange.
Alternator winding treatment Triple-dip thermosetting polyester varnish or vacuum-pressure-coated polyester resin, as described in the datasheets.
Sound level 70dB(A) at 7m in free-field conditions. 70dB(A) at 7m in free-field conditions.
Dimensions, L × W × H 1,650 × 740 × 840mm. 2,280 × 900 × 1,150mm.
Generator weight 630kg. 968kg.
Emissions classification Non-emissions-certified. Non-emissions-certified.
Rating reference conditions 27°C inlet air, 100kPa barometric pressure and 30% relative humidity. Derating applies outside reference conditions.
Prime-duty definition Variable-load operation averaging 70%, in lieu of commercially purchased power. Manufacturer permits 10% overload for one hour in a 12-hour operating period.
Standby-duty definition Variable-load operation during utility power failure; no overload permitted.
Generator warranty 12 months or 1,000 operating hours, whichever occurs first, subject to applicable manufacturer terms.
Duty selection Confirm the generator’s permitted operating profile and suitable load level for the intended off-grid charging schedule; do not treat standby and prime ratings as interchangeable.

Final integration requirements

Item Requirement
Generator connection Approved 230V single-phase supply with correctly sized cable, isolation and protective devices.
30kVA generator integration The generator’s full output exceeds the inverter’s 100A AC-input rating. Additional generator-fed loads require a separately designed distribution arrangement.
Battery charging Maximum 140A through the inverter-charger, further limited by battery BMS, generator headroom and settings.
Automatic start/stop Requires an approved generator-controller interface and tested start, warm-up, load acceptance, stop and fault behaviour.
Battery mounting Two compliant three-module bracket stacks or another appropriately designed mounting arrangement, following the applicable battery manual.
Protection and earthing Final fuse ratings, battery branches, cable terminations, neutral/earth arrangements and AC protection must be verified before installation.
Runtime and fuel savings No fixed figures claimed; depend on actual loads, operating reserves, temperature, losses and charging strategy.
Warranty Individual component terms apply. No combined system warranty duration is inferred.

Documents available for download

The controller manual is not a replacement for the complete generator operating manual. Request the generator, engine and control-interface documents applicable to the supplied equipment before commissioning.

Shipping

Shipping is available to the UK, Ireland, Africa, the Caribbean and worldwide, subject to destination and transport requirements. If a shipping rate is not shown at checkout, call +44 20 8064 0335 or email info@energian.co.uk for a quote.

Confirm delivery access, ground conditions and suitable unloading equipment before dispatch. The generator and battery equipment require specialist handling and may arrive separately.

UK expert support

Energian’s UK team can help with load assessment, battery capacity, generator selection and installation planning. Contact us by phone, email or live chat, or arrange an in-person consultation at our office.

Important: This system requires professional installation and commissioning. Ask Energian about installation through trusted partners and request the final equipment schedule before ordering.