Is your deep cycle battery really working?
Accurate testing and diagnostics for AGM and LiFePO4 lithium house batteries in caravans, campers, 4WD dual battery systems, boats and off-grid solar. We verify true capacity, charging profiles and BMS health.
A deep cycle battery that reads 12.5V at rest might only deliver 30% of its rated capacity under load. We test the full system - battery, solar, DC-DC, mains charger and loads - so you get clear keep or replace advice and upgrades that actually improve your runtime.
True capacity under load
Resting voltage means nothing. We test real usable capacity vs rated Ah.
BMS health and cell balance
Lithium BMS faults, cell imbalance and protection behaviour diagnosed.
Full charging system check
Solar MPPT, DC-DC charger and mains charger outputs verified against battery spec.
Capacity and health test
Open-circuit voltage, internal resistance and controlled load testing to measure true usable capacity vs rated Ah.
AGM and LiFePO4Charge rate verification
DC-DC charger, mains charger and alternator output confirmed against battery chemistry spec. AGM and LiFePO4 profiles checked.
All charge sourcesSolar MPPT performance
Panel output, wiring losses and controller configuration checked and tuned for maximum charging efficiency.
MPPT and PWM controllersBMS diagnostics - lithium
Cell balance, low-temperature cut-off, high and low voltage protection and BMS recovery behaviour all checked.
LiFePO4 specificLoad and inverter testing
Fridge, pump and inverter current draw measured. Runtime calculations confirmed against your actual battery capacity.
Caravan and camperWiring audit and upgrades
Cable gauge, fusing, terminals and connections audited. Undersized or unsafe wiring identified and upgraded.
Safety and performanceCaravans and motorhomes
House battery bank testing and charging system verification for long-range NQ touring.
Camper trailers
Single and dual battery setups for camper trailers and tent campers.
4WD dual battery systems
Auxiliary battery systems in canopies and dual cab setups running fridges and accessories.
Marine house banks
House battery testing for boats running fridges, instruments, lighting and inverters.
Off-grid solar systems
Battery storage health and charging system performance for residential properties and sheds.
Capacity vs rated Ah
True usable capacity tested under controlled load - not just resting voltage.
BMS status and cell balance
LiFePO4 BMS faults, cell imbalance and protection behaviour diagnosed.
DC-DC and alternator charge
Charge current confirmed against battery chemistry and alternator output limits.
Solar MPPT and wiring
Voltage drop, panel output and controller settings verified and adjusted.
Mains charger profiles
AGM, Gel and LiFePO4 charge profiles verified. Stage voltages adjusted as required.
Shunt monitors and SOC
Shunt-based battery monitors configured for accurate state of charge readings.
Load draw and runtime
Fridge, pump and inverter current draw measured. Runtime confirmed against actual capacity.
Wiring and fusing audit
Cable gauge, fusing and terminations checked. Unsafe or undersized wiring identified.
Premium LiFePO4 with Bluetooth BMS. Built for NQ conditions. Full 12V, slimline and higher voltage range in stock.
Reliable AGM deep cycle for caravans, boats and off-grid storage. Wide range of capacities in stock at Townsville Wholesale Batteries.
Deep cycle specialists
Daily installs and diagnostics across caravans, canopies, boats and off-grid. We know these systems.
Measured data - not guesswork
Keep or replace decisions based on actual capacity and charge data.
Full system approach
We check battery, solar, DC-DC and charger together. No point replacing the battery if the charger is wrong.
Stock ready instore
ATG Lithium and AGM deep cycle in stock and ready to fit today.
Mobile service available
Can't get to us? We come to your caravan, boat or property. Callout fees apply.
Local Townsville business
Garbutt based. We understand NQ touring and off-grid conditions.
Book a deep cycle battery test in Townsville
Come instore or call us - we diagnose the whole system and give you clear honest advice.