Lithium Ready Budget Build

If you are looking to build a high quality power system for your van but don't want to spend the money on a Lithium battery the below system could be perfect for you. The system has a quality Renogy DC-DC smart charger which also includes a solar charger controller, the charger can be used with Smart Alternators if required and is suitable for charging all types of leisure batteries.

Full specifications and cable sizing can be found at the end of this article.

"Disclaimer: Installing electrical equipment in a campervan requires technical know-how and an understanding of automotive electrical systems. Improper installation may pose risks such as electrical hazards, fire, damage to the vehicle and personal injury. It is recommended to seek guidance from a professional or thoroughly educate yourself before proceeding with any electrical modifications or installations."

The diagram above illustrates a high quality and cost efficient power system which is ideal for campervans and motorhomes. The system uses a cheaper AGM battery, however, all the components are suitable for a future upgrade to a more expensive Lithium battery if it's required. (Lithium Vs. AGM)

Selecting a power system for your van requires thoughtful consideration of its intended use. Overspecification of systems can lead to unnecessary costs, therefore, estimating your typical van usage is crucial to avoid expenses beyond your budget. This design includes a small 100W solar panel to keep the price as low as possible, this can be upgraded if desired as the Renogy controller can accommodate over 300W of solar input. Alternatively, the charge controller can be upgraded to the 50A model if required.

Unless there is a requirement for prolonged winter usage or the desire to run high powered electrical appliances we would not recommend installing a mains hook-up due to the additional cost. Nevertheless, these features can be easily integrated during the initial build or retrofitted at a later date. The system lacks any means to monitor battery level or usage, if you would like to see live usage and power levels an energy monitor can be added.

The total cost (including cables) is £628 (as of March 2024). Installing this system should be achievable within 2 days depending on the layout of your van. If you're not confident about installing it yourself we'd be glad to discuss how we could help and offer a quote. (All appliances, lighting and outlets are additional to this cost)

Please note, Brento doesn't have an affiliation with any of the companies listed below. However, based on our experience, they offer great products at competitive prices.

To install this system you will need a range of basic tools, and equipment. Having a mix of crimps, terminals, and heat shrink tubing is useful. The list below should provide more than enough consumable items, by planning carefully, you could save money by purchasing specific items separately. Yet, having a variety of parts available ensures the job runs without any delays.

If you haven't worked with automotive electrics before, you might not have the necessary tools for the job. Here are some essential tools vital for a safe and effective installation.

If you'd like to install this system yourself, please read the following notes. It might be possible to reduce cable sizes; however, the current sizes allow it to be installed in any sized van with minimal voltage drop. Sizes have also been standardised to reduce the number of different cables required during the installation.

Notes-

1. All battery/DC-DC cables are to be PVC high flex battery cable 6AWG/16mm2 unless otherwise stated.

2. The lighting, water pump and USB can be supplied from a common power supply however individual supplies provide redundancy in the system, preventing a total power loss due to a single fault.

3. Diesel heaters should be connected directly to the battery without an isolation switch. Isolating the power supply of a diesel heater during operation may cause irreparable damage to the device.                                                                         

Appliances -

USB Outlet - 3A Fuse and 16AWG/1.50mm2 cable

Fridge - Fridges are sold with suitable cables and fuses. Follow manufacturer guidance if this cable needs to be extended.

Lights - For a larger van 6 low wattage LED spotlights should be sufficient, connect using a 5A Fuse and 16AWG/1.50mm2 cable

Water Pump - Follow manufacturer guidance on fuse and cable size. This will differ between manufacturers and models. A small submersible pump typically requires a 5A fuse and 16AWG/1.50mm2 cable

Diesel Heater - Heaters are provided with a suitable cable and fuse. If you need to extend the cable, voltage drop can cause faults during start up due to the high current draw. Consult the manufacturer's instructions if modifying the wiring harness.  For help choosing a heater read the following article.