Complete Off-Grid Pre-Built Kit Builder - Choose Inverter Size, Solar and Battery Options - DIY, Plug and Play**

An off-grid power system is for those living or operating off-grid with no access to mains power. A Victron off-grid system is designed to supplement a generator to provide power more sustainably, store energy from the sun for later use and to offset fuel costs.

Key Components in the System

Solar Panels:

• These capture sunlight and convert it into electricity.
• Solar energy powers your home and charges the batteries during the day.

Battery Bank:

• Stores energy generated by the solar panels.
• Supplies power at night or when solar production is low (e.g., cloudy days).

Victron Inverter/Charger:

• Converts DC power from the batteries or solar panels into AC power used by household appliances.
• Manages the charging of batteries from solar or the generator.

Generator:

• A backup power source that kicks in when the solar panels can’t produce enough energy, and the batteries are depleted.
• Provides additional power during prolonged cloudy weather, winter, or high energy demand.

1. Victron Smart Controller:

• Oversees the entire system, ensuring power flows efficiently between solar, batteries, and the generator.

How the System Works

Normal Operation:

• During sunny days, solar panels generate power for immediate use and charge the batteries.
• Excess solar energy is stored in the batteries for use during the night or when the sun isn’t shining.

When Solar Isn’t Enough:

• On cloudy days or during winter, when solar production is low, the system uses stored battery power.

1. Backup Generator:

• If the batteries run low, the generator automatically starts (if enabled) to provide power and recharge the batteries.
• Once the batteries are sufficiently charged, the generator turns off, and the system goes back to using solar.

Why a Generator is a Good Backup

Reliable Energy During Extended Cloudy Periods:

• In regions like the UK, where sunlight hours can be very low in winter, a generator ensures you’re not left without power.

Covers Peak Loads:

• If your energy demand suddenly spikes (e.g., using heavy appliances), the generator can provide the extra power without overloading the system.

Battery Longevity:

• Running batteries down to very low levels frequently can shorten their lifespan. A generator prevents this by recharging the batteries when needed.

Peace of Mind:

• It ensures you always have power, even during unforeseen circumstances like prolonged bad weather or high energy demand.

1. Scalability:

• If you add more devices or appliances in the future, the generator can compensate for increased energy needs until you upgrade your solar or battery system.

Complete Off-Grid Solar Power Kit — Pre-Built, Tested & Ready to Go

Go fully off-grid without the hassle. Each kit is professionally designed, assembled, and programmed in Devon by our in-house Victron Energy & Pytes specialists, so you can plug in and power up with confidence.
Forget complicated wiring or setup,  we’ve already done it for you.

🔧 How It Works

1. Mount your solar panels.

2. Connect the panels to the pre-built power board.

3. Connect your batteries.
   That’s it, your system is live.

All boards are pre-wired, programmed, and tested before dispatch for a truly plug-and-play experience.*

Choose Your Power Setup

Each kit is custom-built to match your needs. Pick your ideal inverter, battery capacity, and solar size using the options above.

Inverter Size Options

Battery Options

All systems use Pytes V5A LiFePO₄ batteries — safe, long-life, and scalable.

• 10.24 kWh → 2 × 5.12 kWh Pytes V5A

• 15.36 kWh → 3 × 5.12 kWh Pytes V5A

• 20.48 kWh → 4 × 5.12 kWh Pytes V5A

• 25.6 kWh → 5 × 5.12 kWh Pytes V5A

• 30.72 kWh → 6 × 5.12 kWh Pytes V5A
  
  Expandable and compatible with Victron ESS systems.

Solar Panel Options

Premium JA Solar 440 W N-Type Bifacial Double Glass All-Black panels
(L 1762 mm × W 1134 mm × D 30 mm – 440 W each)

You may chose to oversize your solar panel choice to maximise your solar input, depending on how many panels you can fit on your roof. We've built a simple solar panel roof calculator tool that can help estimate sizing!

🧠 What’s Included

• Pre-built power board: Cerbo GX 2 controller, Touch screen, Lynx Distributor, consumer unit, isolation switches, trunking, sockets, all wiring & programming.

• SmartSolar MPPT charge controller:

  • Up to 10 panels → 250/60-MC4

  • Over 10 panels → 250/100-VE.Can

• All cabling, breakers, fuses & safety isolation pre-installed.

• JA Solar panels + full mounting kit (rails & brackets).

🕒 Build & Delivery

• Built to order in 1–2 weeks (larger systems may vary slightly).

• Fully tested before shipping.

• Free tracked UK delivery by secure pallet. 

🧰 Installation Notes

This kit is designed for ease of installation, but we recommend it be fitted by a competent person.
All boards are plug-and-play ready with safety switches, labelled connectors, and factory-tested programming.

“DIY” refers to the simplicity of setup, not electrical qualification. Always follow regulations for final connection.

💬 Expert Support

Your system is backed by Callidus technical support and our Victron-certified team — before, during, and after installation.

Have questions about which kit fits your home or cabin?
Talk to our specialists today.

⚡ Why Choose Callidus

• 6,000+ happy customers

• 30,000+ products sold

• Rated 4.8 / 5 from hundreds of reviews

• Victron Energy Authorised Distributor
  

• Pytes Energy Official UK Distributor
  

• Built in Devon 🇬🇧

The board in the images above is an example board and yours will be built bespoke to your requirements. 

Tracked Delivery:

• Free tracked delivery via Pallet on all pre-built boards.

Collection:

• Free to collect from our warehouse.

Pre-Order:

• All of our boards are made bespoke for the customer. This process usually takes 1-2 weeks to assemble the boards. We ask customers to allow a 3 week window from date of order.

Shipping Policy