Dual Battery Systems
Design • Supply • Install — Dual Battery Systems for 4WDs, caravans & off-grid setups. Townsville Wholesale Batteries designs, supplies and installs dual battery systems across North Queensland — from simple Anderson connections to full lithium + inverter builds.
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Why choose TWB for dual battery?
- Vehicle-matched charging — DC–DC chargers and isolators sized to alternator output and battery chemistry (AGM/LiFePO₄).
- Neat & serviceable installs — roof-rack, canopy, under-bonnet or behind-panel layouts with labelled looms and correct fusing.
- Quality gear — Victron chargers & monitors, AllSpark & ATG lithium, premium cabling and hardware.
- Tested & warranted — voltage-drop checks, load testing and TWB workmanship warranty on every job.
Popular dual battery packages
Every package includes correct cable sizing, lugs, heat-shrink, tidy mounting, fused distribution and full testing.
Most popular — Tourer AGM
From $1,199 inc. install • 120Ah AGM aux • 40A DC–DC • Grey Anderson • 12V socket + volt meter
Best value — Lithium Weekender
From $2,299 inc. install • 100Ah LiFePO₄ (ATG/AllSpark) • 30–50A DC–DC (MPPT ready) • Bluetooth monitoring
Premium — Canopy Power Hub
From $3,999 inc. install • 200Ah LiFePO₄ • Victron Orion/SmartSolar • 1000W inverter • 175A Anderson • fused board
What we build & fix
From simple top-ups to full touring systems:
- 4WD & Canopy Systems — fixed or modular dual battery setups for fridges, lights, compressors and inverters.
- Caravan & Camper Systems — lithium banks with DC–DC and distribution to 12V and 240V (via inverter).
- Portable/Blanket Charging — plug-and-play Anderson connections to top up while parked in the shade.
- Controllers & Upgrades — swap to lithium-ready DC–DC, add solar inputs, integrate Bluetooth monitoring.
- Fault-finding & Repairs — diagnose poor charge rates, failed isolators, undersized wiring or bad terminations.
Dual battery diagram
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FAQs
Do I need a DC–DC charger with lithium?
Yes — lithium requires the correct charge profile and current limit. We size DC–DC to your alternator and battery chemistry.
Can you integrate solar with my dual battery?
Absolutely. We add MPPT inputs, blanket plugs and roof/canopy arrays — and configure charging for AGM or LiFePO₄.
What about warranty and testing?
Every install includes voltage-drop checks, load testing and TWB workmanship warranty. Lithium packs carry manufacturer warranties.
Do you offer mobile installs?
Yes — mobile or in-store. We’ll recommend the best option based on your vehicle and scope.
Ready to build your dual battery system?
Call 0459 364 303 • sales@twbgroup.com.au — Tell us your vehicle and accessories, and we’ll spec the perfect setup.
42‑Month Warranty • New!
Amaron Car Batteries — Built for North Queensland. In Stock Today.
Premium starting power, long life and zero‑maintenance. Backed by Townsville Wholesale Batteries with rapid delivery and expert fitment.
✓ 42‑Month Warranty Coverage
✓ High CCA • Reliable Cold Starts
✓ Heat & Vibration Resistant
✓ Maintenance‑Free • Fit & Forget
Local stock • Same‑day delivery*
Expert testing & fitment
Trade pricing available
Featured: Amaron DIN100
High CCA • Silver alloy plates • Sealed MF
CCA900+
Warranty42 mo
DesignSealed MF
UsePassenger / 4×4