Off-Grid Energy Storage System (w/o Solar) TYRANN 10kW 48V Inverter, 20/25kWh LiFePO4 Batteries, and 12kW Generator

Powerful All-in-One Solution for Reliable Off-Grid Power

Unlock the potential of this powerful yet cost-effective Off-Grid Energy Storage Kit to store energy from your on-site sources - such as a generator and/or optional solar panels - and enjoy quiet, cost effective electricity when you need it. Run your generator during quiet hours and stop it when you need only limited power. Connect optional solar panels using a separate charge controller right away or add them later as your installation or needs grow. Benefit from our expert advice and support pre- and post-purchase.

A full set of installation instructions and system schematic are supplied with your order. 

The system includes:

• 4 or 5 LFP48-100 48V 5.12kWh Wall Mounted LiFePO4 Battery (other capacities available on request)
• 1× TBB TYRANN 48V 10kW Pure Sine Wave Inverter Charger
• 1× full set of cables, connectors, disconnectors, and accessories
• 1× Honda GCE12000H 12000W Electric and Remote Start Petrol Generator

With a 20–25kWh battery bank and a continuous 10kW power output, this off-grid power supply can supply off-grid workshops, leisure centres, warehouses and off-grid homes. Enjoy high-draw appliances such as washing machines and water pumps.

The TYRANN 10kW inverter-charger forms the foundation of an expandable energy system capable of integrating various sources including generators and, optionally, solar or wind (via separate charge controllers). It ensures uninterrupted energy flow and optimises supply for energy freedom.

Custom designed kits available - contact us to discuss your requirements.

What’s included: A basic set of cables, protection devices, and accessories to build a functional system. Manuals and wiring diagrams are included. Mounting not included—choose a system here or contact us for advice.

Safety Compliance: Installation in residential settings must comply with PAS 63100:2024 .

Flexible Installation: For residential properties, battery systems should be installed outside living areas. The batteries to be installed outdoors. Remote monitoring is supported via smartphone or web portal.

Note: This Off-Grid Kit must be installed by a licensed electrician or technician. For full residential compliance guidance, see here.

Free UK Delivery: 2–4 working days (longer delivery times and extra chargers may apply for Highlands, Islands, and Northern Ireland).

Do you need installation service for your off-grid kit? We can arrange! Just contact us on info@energian.co.uk or 020 8064 0335 for a tailored quote.

▼ 10kW/20-25kWh ESS Specifications

HONDA GCE12000H 12000W ELECTRIC AND REMOTE START PETROL GENERATOR

▼ 10kW/20-25kWh ESS In the Box

• 4x or 5x LFP48-100 48V 5.12kWh Wall-mounted LiFePO4 battery- 1 X pallet, 
• 1x TYRANN Off-Grid 10000W 48V Pure Sine Wave Inverter Charger - 1 X carton,
• 1x set of cables, disconnectors, and accessories, and
• 1x Honda GCE12000H 12000W Petrol Generator - 1 X pallet.
  

▼ 10kW/20-25kWh ESS FAQ's

BATTERY BANK

Warning:

Never mix batteries within the battery bank. All batteries must be of the same type, size, and general age. Using an old, mismatched, or faulty battery can cause significant issues.

Note: New batteries behave like older ones initially and require a few cycles to function optimally.

1. What is the battery bank capacity of the 10kW/20-25kWh ESS?

The 10kW/20-25kWh ESS utilises three or four LFP-100 48V 5.12kWh Lithium Iron Phosphate (LFP) batteries, providing a total capacity of 20/25Wh if connected in parallel. Its patented design ensures optimal use of active materials, significantly enhancing both the utilisation rate of active material and the efficiency of the battery's internal space. This system delivers exceptional performance, even during high-current discharge scenarios.

2. What is the cycle life of the battery?

The batteries are rated for 6,000+ cycles at 95% depth of discharge (DoD).

3. How can I maximise the lifespan of the battery?

• Regular Charging: The battery must be charged at least once every six months. During this maintenance charge, ensure the State of Charge (SoC) exceeds 90%.

• Annual Checks: After installation, inspect the power connector, grounding points, power cables, and screws annually. Ensure there are no loose connections, broken components, or signs of corrosion. Verify the installation environment is free from dust, water, and insects, and remains suitable for an IP20-rated battery system.

• Storage Maintenance: If the battery is stored for extended periods, recharge it every six months to maintain an SoC above 90%.

4. What are the battery care and storage instructions?

• Storage Charging: Recharge the battery every six months when stored, ensuring the SoC is at least 90%.

• Post-Discharge Recharging: Recharge the battery within 12 hours after a full discharge.

• Environment Restrictions: Avoid installing the battery in outdoor environments or locations outside the operational temperature or humidity range specified in the manual.

5. When should I charge my battery?

LiFePO4 batteries do not require charging after every use unless fully discharged. They are not damaged by remaining in a partial state of charge (PSOC). Charge the battery after use or when it has been discharged to 80% depth of discharge (DoD), leaving a 20% state of charge (SoC).

6. What should I do if the battery bank loses power too quickly?
Check Appliance Power: Verify whether high-power electrical appliances are connected. For example, with a 15kWh or 20kWh Off-Grid Energy Storage System, if a connected appliance consumes approximately 2,000W, the battery will last about 6.5 hours (from the full 15kWh charge) or 8.6 hours (from the full 20kWh charge) when discharged from 100% to 10%.

DC TO AC INVERTER

1. What does a power inverter do?

A power inverter converts battery power into mains electricity. Specifically, it transforms 48V direct current (DC) into 230V alternating current (AC). This 230V AC matches the electricity supplied by utility companies and is suitable for household appliances like lights, televisions, and refrigerators.

In the 10kW/20-25kWh ESS the TYRANN Off-Grid 10000W 48V Pure Sine Wave Inverter Charger is used to create a home 230V "grid".  

2. What type of inverter is used in the 10kW/20-25kWh ESS?

The system uses a pure sine wave AC Coupled inverter rated at 10000W. This inverter outputs a smooth, harmonic sine wave closely resembling mains power. It seamlessly switches polarity ("+" and "-") between power cables and adjusts voltage gradually to meet demand. This inverter design ensures compatibility with a wide range of appliances.

3. What are the key feature of this inverter?

10000W 48V Pure sine wave inverter:

• Converts DC current into 230V AC mains electricity to power household appliances such as TVs, laptops, fridges, microwaves, and lighting.

• Delivers 8000W continuously, with a peak capacity of 30000W to support appliances requiring high starting currents, such as pumps or vacuum cleaners.

Enhanced 140A smart battery charger:

• Enables fast, efficient (up to 110A), and safe charging of batteries from a generator, featuring multiple charging stages and overcharge protection.

System expansion potential:

• Can be connected in parallel with up to three inverters for system expansion, handling up to 30kW.

• Supports 3-phase operation for industrial-grade machinery.

4. What are the additional feature of this inverter?

• Automatic Generator Start (AGS): Activates a generator only when necessary for optimal energy use.

• Power Assist and Control: Allows a small generator to handle heavy loads by supplementing power as needed.

• User-Friendly Monitoring: Features the Nova Web and mobile app via the TBB-KIN2 Kinergy-II Wi-Fi module for remote monitoring and control.

• Reliable Operation: A fast 4ms switch ensures uninterrupted power during outages. ECO mode maximises battery backup time with low energy consumption.

• High Efficiency: Achieves 96% inverter efficiency and 98% MPPT efficiency, maximising energy output.

5. WHAT CAN I USETYRANN 8000W 48V INVERTER FOR?

The 10000W 48V off-grid inverter charger is selected based on typical power consumption for standard household appliances. Refer to the table below for examples.

Appliances marked with an asterisk (*) are likely to have a starting power consumption several times higher than their normal operating power. This is typically due to the presence of electric motors. For example, an electric lawnmower with a normal operating power of 1,000W may have a starting power of over 4,000W. An inverter with a continuous power of 3,000W is suitable in such cases because it can handle a peak power of up to 6,000W.*

**Appliances without electric motors may also have variable power consumption with occasional spikes. These spikes necessitate a larger inverter than would typically be required for devices with similar nominal power ratings.

Please note: This table is for general guidance only. The actual power consumption and starting power requirements of your appliances may vary significantly. Always check the specifications of your devices to confirm their continuous and starting power requirements.

If multiple devices are connected to the inverter, the total power consumption should be the sum of all connected appliances. This total will determine the inverter capacity required.

6. Why are a 48V battery bank and a 48V DC to 230V AC inverter used in this system?

This configuration offers several key advantages:

• The inverter’s input current is two to four times smaller at 48V compared to 24V and 12V, respectively, improving system safety and reliability.

• The cables connecting the battery to the inverter can be thinner than those required for a 24V or 12V system, reducing material and installation costs.

7. What AC inputs/outputs does the inverter have?

• 2 x 100A 230VAC INPUT;

• 2 x 100A 230VAC OUTPUT.

8. Does the inverter have wireless control?

The inverter can be set up to send data to an online user portal using a NOVA WEB & APP. 

9. What should I do if the inverter cannot power electrical appliances?

• Confirm that the inverter's output power meets the power requirements of the connected appliances.

• If a warning is displayed, follow the troubleshooting steps outlined in the User Manual.

10. What should I do if an appliance's usage time is too short?

• The inverter operates at less than 100% efficiency, with the best efficiency being approximately 98%.

• Actual usage time may vary depending on the continuous power demand of the appliance.

• For an accurate calculation of usage time, contact Energian Customer Service with the specifications of your appliances.

If you have any questions, please call us on 020 8064 0335 or email info@energian.co.uk.