Series vs Parallel - Building 12.8V or 25.6V Lithium Systems

Series vs Parallel - Building 12.8V or 25.6V Lithium Systems

Intro
Most caravans use 12.8V LiFePO4, but some benefit from 25.6V. Here is when to use series or parallel - and what to watch for.

Parallel - More Capacity at the Same Voltage

  • Use case - extend runtime at 12.8V by paralleling two or more identical batteries.
  • Best practice - same brand, model and age, charge each battery fully before paralleling.
  • Cabling - balance the take-off and return so current shares evenly.


Series - Step Up to 25.6V

  • Use case - reduce current for higher-power inverters or long cable runs.
  • Compatibility - all chargers, MPPT and loads must support 24/25.6V.
  • BMS considerations - ensure your batteries are designed for series use per the manufacturer.


Common Mistakes

  • Mixing battery sizes or ages in the same bank.
  • Skipping pre-charge balancing before paralleling.
  • Using chargers that do not support your chosen system voltage.


Bottom line
Choose parallel to increase capacity at 12.8V, series to step to 25.6V - but only with batteries and chargers approved for that configuration.

Shop matching lithium batteries for parallel or series use

Why Choose VanDIY?

VanDIY is a Queensland-based supplier of quality caravan parts and accessories. We’ve been supporting Australian travellers and DIY builders since 2006, offering proven products and real local support.

  • With warehouses in Gympie, Brisbane and Melbourne – we dispatch Australia-wide
  • Authorised SJRV distributor and product partner
  • 3-year warranty on major components
  • All stock tested and backed before it reaches our shelves
  • Fast, transparent freight and reliable customer service

Frequently Asked Questions

What caravan parts do you stock?


We offer a wide range of caravan parts and accessories including windows, fridge vents, roof fans, lithium batteries, 12V fridges, hot water systems, toilets, and washing machines – all designed for Australian conditions.

Where do you ship from?


We have 3 warehouse options - Gympie, Brisbane and Melbourne - Providing an item is in stock we will ship ex Gympie or Brisbane. If not in stock here, we'll ship ex Melbourne via the SJRV warehouse with fast and reliable freight options available Australia-wide.

Do you offer pickup?

Yes, we offer pickup from our Brisbane warehouse. If the item is out of stock in Brisbane, we'll ship it up ex Melbourne to the warehouse and notify you when ready.

Do you sell to trade and DIY customers?


Yes – VanDIY supplies both trade customers and DIY builders. Contact us for wholesale or volume pricing if you’re building or fitting multiple vans.

Shop Caravan Parts & Accessories Australia-Wide


Whether you’re building, repairing or upgrading your caravan, VanDIY makes it easy to find the right parts for your project. We stock a complete range of caravan parts and accessories including windows, vents, fans, fridges, lithium batteries and more – all tested for durability in Australian conditions. With warehouses in Gympie, Brisbane and Melbourne, we ship fast across Australia, offering real local support and advice. Browse online today or contact our team for help choosing the right gear for your build.