Victron 8kVA 48V Off-Grid Energy System with 24.0kWh LiFePO₄ Battery and 15kVA/20kVA Generator - No Solar Required

   
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Victron 8kVA 48V Off-Grid Energy System with 24.0kWh LiFePO₄ Battery and 15kVA/20kVA Diesel Generator – No Solar Required

  • Run suitable off-grid equipment from battery power between generator charging sessions, without installing solar panels.
  • Supply 230V single-phase loads through a Victron inverter rated at 8kVA / 6.4kW continuously at 25°C.
  • Store 24.0kWh nominal energy in five Pylontech LiFePO₄ batteries, with a choice of Bimson Power 15kVA-class or Excel Power 20kVA prime-rated diesel generator.

Victron 8kVA off-grid energy system: battery power without solar

This Victron 8kVA off-grid energy system combines a MultiPlus-II 48/8000/110-100 inverter-charger, five 4.8kWh Pylontech US5000-series batteries and a selected diesel generator. The generator supplies accepted AC input and recharges the batteries. When it stops, suitable loads continue to run from stored energy, with Cerbo GX and GX Touch 50 providing system monitoring and control.

Key features

  • No solar required: suitable where shading, limited roof space, tenancy restrictions or site layout make a solar array impractical.
  • Battery operation between charging sessions: avoid running the generator continuously for smaller loads. Actual generator hours depend on consumption and charging requirements.
  • Managed generator loading: PowerControl manages charging demand, while PowerAssist can supplement an accepted generator supply with battery power when correctly configured.
  • Modular lithium storage: five parallel-connected batteries provide 24.0kWh nominal and 22.8kWh usable DC energy at the specified 95% depth of discharge. Delivered AC energy is lower.
  • Local and remote visibility: monitor the system through GX Touch 50 and, with an internet connection, Victron’s VRM platform.

Where to use

Consider this system for logistics-site offices, security cabins, communications equipment, agricultural outbuildings, rural workshops and other premises without a suitable grid connection. Assess lighting, refrigeration, IT equipment and tool loads against their running demand and starting currents.

The inverter supplies 6.4kW continuously from the batteries at 25°C, reducing to 5.5kW at 40°C. A larger generator does not increase these battery-only ratings. The 15kW inverter peak figure is not a continuous operating rating.

Choose your diesel generator

15kVA-class option: Bimson Power LDG15S-UK

The single-phase LDG15S-UK provides 12,000W rated output and 13,000W maximum output, with electric key starting, AVR voltage regulation and a 35-litre diesel tank. Its ATS input is intended for the manufacturer’s compatible panel, supplied separately; it does not establish a direct Cerbo start connection.

The UK model has separate 240V and 120V outlets. The installed feed must respect the selected socket’s current rating; do not assume the generator’s full output can pass through one 32A socket.

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

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

The Excel datasheet identifies this model as non-emissions-certified. Confirm its suitability for the intended duty, location and applicable emissions requirements before ordering.

How the system works

With the generator stopped, the inverter supplies the main AC output from the battery bank. Once an acceptable generator supply is available, the MultiPlus-II transfers to that supply and uses available capacity for charging within the configured limits.

The battery charger is limited to 110A. Generator capacity is shared between connected loads and charging, and the commissioned input limit must suit the connection and protection. No fixed runtime, recharge time or fuel-saving percentage is claimed.

Proposed package contents

  • 1 × Victron MultiPlus-II 48/8000/110-100 230V inverter-charger.
  • 5 × Pylontech US5000-series 4.8kWh LiFePO₄ battery modules, with compatible mounting brackets.
  • 1 × Victron Cerbo GX MK2, GX Touch 50 display and wall mount.
  • 1 × selected Bimson Power LDG15S-UK or Excel Power XL-DK-22S diesel generator.
  • Battery cabling, terminations, isolation and protection components as itemised in the final quotation. Confirm site-specific AC protection, battery distribution, generator-control equipment and installation accessories before order.

Installation and commissioning

This is a supply-only system, not a plug-in kit. A qualified installer must design and commission the generator connection, battery distribution, earthing, protective devices and load circuits. Energian can assist with installation through trusted partners.

If the battery installing in or near a residential building, your installer must ensure compliance with PAS 63100:2024.

Automatic generator starting requires an approved interface and manufacturer-compatible controls. The Bimson manual restricts its ATS socket to the specified Bimson Power panel. Do not connect the Cerbo relay directly or substitute an unapproved ATS arrangement.

Install the inverter and batteries in suitable dry equipment accommodation. The Pylontech manual specifies no charging below 0°C and a maximum of three modules per bracket stack; five modules require separate compliant stacks or a suitable rack arrangement.

Combustion generators must operate outdoors with safe exhaust clearances, away from doors, windows and air intakes. Fuel, engine oil, starter-battery maintenance and periodic servicing must be included in the operating plan.

Technical specifications

Inverter figures follow the attached Victron 48/8000/110-100 datasheet. Battery figures are per US5000 module unless stated otherwise. Where the attached battery documents differ, installation-manual values are explicitly identified; confirm the supplied hardware revision before commissioning.

Specification Value
System configuration
System type Single-phase, generator-charged off-grid battery system.
Inverter-charger Victron MultiPlus-II 48/8000/110-100, 230V.
Battery bank 5 × Pylontech US5000-series modules connected in parallel.
Nominal battery voltage 48V DC.
Nominal bank energy 24.0kWh, calculated as 5 × 4.8kWh.
Monitoring Victron Cerbo GX MK2 and GX Touch 50.
15kVA-class generator option Bimson Power LDG15S-UK, 230V single-phase
20kVA generator option Excel Power XL-DK-22S, 230V single-phase.
Victron: inverter output
Continuous apparent output at 25°C 8,000VA.
Continuous active output at 25°C 6,400W.
Continuous active output at 40°C 5,500W.
Continuous active output at 65°C 4,000W.
Peak output 15,000W
Maximum apparent feed-in power 8,000VA
Output voltage 230V AC ±2%.
Output frequency 50Hz ±0.1%
DC input-voltage range 38–66V DC
Maximum efficiency 95%.
Zero-load consumption 29W.
Zero-load consumption in AES mode 19W.
Zero-load consumption in Search mode 3W.
Transfer to inverter operation Less than 20ms
Victron: AC input and battery charger
Maximum AC input current 100A
Transfer-switch rating 100A.
AC input-voltage range 187–265V AC.
AC input-frequency range 45–65Hz.
Maximum battery charging current 110A
PowerControl Manages battery-charging demand within the configured AC input-current limit.
PowerAssist Allows battery power to supplement an accepted AC input when enabled and correctly configured.
Main AC output Inverter-backed output for suitable loads.
Auxiliary AC output Available only when accepted AC input power is present.
Victron: controls, protection and enclosure
VE.Bus Configuration, monitoring and system integration
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
Inverter relay DC contact rating 4A up to 35V DC; 1A up to 60V DC.
On-site configuration VEConfigure with a suitable computer and MK3-USB interface.
Remote monitoring Victron VRM through an internet-connected GX device.
Cooling Fan-assisted.
Operating-temperature range −40°C to +65°C; output derating applies.
Maximum humidity 95%, non-condensing.
Enclosure material and colour Steel, blue RAL 5012.
Ingress protection IP22.
Battery connections Four M8 bolts: two positive and two negative connections.
AC connections M6 bolts.
Dimensions, H × W × D 642 × 363 × 206mm.
Weight 42kg.
Protection functions Output short circuit; overload; high/low battery voltage; overtemperature; external 230V on inverter output; excessive DC input ripple.
Safety references 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.
Pylontech US5000: battery performance
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%
Charge-voltage range 52.5–53.5V DC
Maximum continuous charge/discharge current

100A per module
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.
Communication CAN and RS485.
Pylontech US5000: construction and operating conditions
Module dimensions, W × D × H 442 × 420 × 161mm.
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 and protected from water, direct sunlight and unsuitable temperatures.
Bracket-supported stacking limit Maximum three modules per stack in the attached installation manual.
External battery cable kit Separate from the module carton. The attached manual rates each specified external cable pair at 100A continuous; sufficient approved connections and protection are required.
Specified external cable-kit length Less than 3m
Design life More than 15 years at 25°C
Cycle life More than 6,000 cycles at 25°C
References listed in battery manual IEC62619; IEC63056; UL1973; UL9540A; IEC61000-6-2; IEC61000-6-3; UN38.3. 
15kVA-class option: Bimson Power LDG15S-UK
Model and phase LDG15S-UK, single-phase; do not substitute the LDG15S3 three-phase model.
Marketed generator class 15kVA.
Rated active output 12,000W.
Maximum active output 13,000W.
Frequency 50Hz.
UK outlets, attached brochure 1 × 240V 16A; 1 × 240V 32A; 1 × 120V 16A; 1 × 120V 32A.
Connection to this system Use the approved 230/240V supply arrangement
Voltage regulation Automatic Voltage Regulator, AVR.
Start system Electric key start.
ATS provision ATS input socket. The manual specifies Bimson Power panel 190102000010; panel supplied separately.
Cerbo automatic-start integration Not established by the ATS socket. Requires manufacturer-approved integration; do not connect an unapproved ATS or direct relay interface.
Engine model, attached manual LA292FA-C.
Engine type Four-stroke, twin-cylinder, air-cooled diesel
Displacement 1,064cc.
Engine power, attached brochure 18.7HP at 3,000rpm.
Bore and stroke, attached manual 92mm bore; 80mm stroke.
Engine speed 3,000rpm.
Fuel Diesel.
Fuel-tank capacity 35 litres.
Engine-oil capacity 3 litres.
Recommended oil, attached manual 10W-30 non-synthetic or part-synthetic
Noise level 75dB(A) at 7m
Instrumentation 3-in-1 Intelli Volt Meter.
Low-oil protection Low-oil shutdown sensor.
Starter-battery system, attached manual 12V
Cold-start provision Preheater function described in the manual for temperatures below 0°C; operating limits and starting procedure still apply.
Routine servicing, attached manual Periodic servicing at 100 hours or three months, as applicable to each maintenance item
Water exposure The manual prohibits operation exposed to rain, snow or water sprays; provide a manufacturer-approved operating location.
Certification marks, attached brochure UKCA and CE
Commercial/industrial warranty, attached manual One year or 500 operating hours, whichever occurs first
Domestic warranty, attached manual Up to two years or 1,000 operating hours, whichever occurs first
20kVA option: Excel Power XL-DK-22S
Configuration 230V, single-phase, 50Hz.
Prime electrical rating 20kVA / 20kW.
Standby electrical rating 22kVA / 22kW.
Prime-duty definition Variable load 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.
Engine manufacturer FAWE.
Engine model 4DW92-35D.
Engine configuration Four cylinders, in-line, four-stroke, naturally aspirated.
Governor Mechanical.
Bore × stroke 90 × 100mm.
Displacement 2.54 litres.
Compression ratio 17:1.
Cooling Water-cooled with engine-driven fan.
Engine speed 1,500rpm.
Gross engine power 26kW; not the generator’s electrical-output rating.
Fuel Diesel.
Fuel consumption at 100% load 5.48 litres/hour
Fuel-tank capacity 71.4 litres.
Alternator make and model Depco DPC184G.
Alternator bearing arrangement Single bearing.
Alternator insulation class Class H.
Alternator ingress protection IP23
Excitation Shunt
Voltage regulation AVR, ±1%.
Controller Deep Sea Electronics DSE6120.
Standard electrical connection Hard-wired; optional sockets available.
Output circuit breaker Delixi fixed-type, three-pole MCCB, as specified in the datasheet.
Exhaust Residential-grade silencer within the canopy.
Mounting Engine and alternator on anti-vibration mounts.
Coupling Close-coupled with SAE semi-flexible flange.
Noise level 72dB(A) at 7m in free-field conditions.
Dimensions, L × W × H 1,900 × 780 × 1,000mm.
Generator weight 673kg.
Rating reference conditions 27°C inlet air, 100kPa barometric pressure and 30% relative humidity
Emissions classification Non-emissions-certified
Generator warranty 12 months or 1,000 operating hours, whichever occurs first, subject to applicable terms.
Final system integration
Battery charging limit Up to 110A through the MultiPlus-II, further limited by battery BMS, generator connection and commissioned settings.
Automatic generator control Project-specific, requiring manufacturer-approved hardware, control logic and commissioning. ATS-ready does not mean Cerbo-compatible.
Protection and isolation Final battery branches, fuse ratings, disconnector arrangement, cable sizes and AC protection require design verification.
Battery-powered runtime Depends on actual consumption, usable battery energy, inverter losses, temperature and operating reserves.
Recharge time Depends on starting state of charge, BMS limits, connected loads and available generator charging capacity.
System warranty Individual component terms apply; no combined warranty duration is inferred.

Documents available for download

Ask Energian for the operating manual and control-interface documentation applicable to the selected Excel generator. Manufacturer documents may cover different revisions; the supplied equipment’s nameplate and applicable instructions must be checked before installation.

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 and unloading arrangements before dispatch. Batteries and generators require suitable handling equipment and may arrive separately.

UK expert support

Contact Energian’s UK team by phone, email or live chat for questions, support requests and system-selection advice. You can also arrange an in-person consultation at our office.

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