Topo Systems Guide

Go farther and stay out longer with the TOPO DC POWER.




How does a TOPO portable lithium system work?

Topo’s Modern dual battery systems are designed to be installed outside the engine compartment or “under the bonnet” for improved safety, performance, and reliability. They can be installed in a variety of locations, such as the rear cargo area, or in a battery box or tray mounted to the chassis or body.

A true Plug & Play system, Topo’s Modern portable dual battery systems halve dual battery installation and wiring costs, are longer lasting and offer benefits such as:

  • Over 2000+ REAL WORLD charge cycles
  • 1/3 the weight of traditional lead acid batteries
  • Built-in FAST charging, charging from Vehicle, Solar and Mains power simultaneously
  • Portable Dual battery system, protected in a custom-made tough and compact steel casing to save valuable weight and space for extra gear
  • Built-in intelligent battery management systems and maintenance-free lithium iron phosphate
  • Backed with 100% buyer satisfaction and unparalleled manufactures knowhow and support


Our battery system models

72AH Centrefire

The 72Ah Centerfire is the most complete and portable dual battery system in the market. Weighing in at 10.5KG and with the footprint of a lunchbox, it boasts over 65 usable amps( 780WH). The ultimate primary or backup battery system to take with, in any car, caravan and gathering.

Ideal for:

  • Adventurers, tradies, and weekend warriors who are always on the move and living life to the fullest!
  • For cheeky weekend trips away with best mates and the legends who always have a cold one ready after a long day
  • A dual battery system for everyday power needs

144Ah Long Range

The 144Ah Long Range is a slimline design similar to the size of a briefcase weighing in at 21KG. Offering twice the stored battery capacity of the Centrefire, it can power two times the number of accessories at two times the rated current discharge compared to the Centerfire. This is a product for those looking to take their travelling experience to the next level. Its slim design makes it an ideal fit behind seats and in canopies to gain valuable storage space.

Ideal for:

  • Seasoned travellers, young families or “Semi” retired full time adventurers enjoying the great outdoors!
  • When the need to keep the remote workstation, camera equipment and kids entertainment powered are a must!
  • If one fridge or freezer is just not enough and you’ve just landed on the idyllic secret Barra spot…

Topo’s Built-in DC/DC Charger

– 20A DC/DC
– 40A DC/DC

Topo’s Robust Mains Charger

– 10A Mains charger
– 20A Mains Charger

Topo’s Built-in Solar Controller

Accepts 12V & 24V Solar Panels
VOC : 20-50V | Max: 25A

Get more out of Topo’s powerful lithium battery with Topo’s Standard built-in fast charging across all Topo lithium system models

  • Built- in 20Amp or 40Amp DC/DC charger
  • Built-in Solar Controller, max 25Amp solar charge
  • Supplied with 10A or 20A Mains charger

Flexibility of being charged “FAST” from all available VehicleSolar & Mains charging sources SIMULTANEOUSLY

0-100% in 1 hour !

Topo Systems can accept a max charge rate of 65Amp, out of the box
– Vehicle 40A DC/DC + Solar & Mains ( Combined 25A )


Our lithium systems range from 12V 72Ah, 12V 144Ah and 12V 216Ah battery capacity, able to provide power when and where you need it most – whether you’re off the grid, on the go or on the trail, you can keep your fridge running, lights on and charge your phone, tablets, and countless other devices.

The Topo Centerfire, is our most portable 12V power system. Comes with a powerful 12V/72Ah (864Wh) LiFePO4 battery that weighs in at around 10kg and equipped with fast charging and features standard across all Topo lithium battery systems.

Phone | 10Wh

75+ Charges (72Ah)
170+ Charges (144Ah)
230+ Charges (216Ah)

Fridge | 12-30Wh

26-65 Hours (72Ah)
52-130 Hours (144Ah)
78-195 Hours (216Ah)

Laptop | 75Wh

10+ Charges (72Ah)
20+ Charges (144Ah)
30+ Charges (216Ah)

Mirrorless DSLR | 75Wh

10+ Charges (72Ah)
20+ Charges (144Ah)
30+ Charges (216Ah)

Tablet | 20Wh

35+ Charges (72Ah)
75+ Charges (144Ah)
110+ Charges (216Ah)

Drone | 75Wh

10+ Charges (72Ah)
20+ Charges (144Ah)
30+ Charges (216Ah)

Action Cam | 5Wh

150+ Charges (72Ah)
300+ Charges (144Ah)
450+ Charges (216Ah)

Light | 5-10Wh

70-150+ Hours (72Ah)
150-300+ Hours (144Ah)
230-450+ Hours (216Ah)

Topo Centrefire

72Ah = 864 Wh

Topo Long Range
144Ah Lithium Series

144Ah = 1728 Wh

Topo Long Range
216Ah Lithium Series

216Ah = 2592Wh

The above should be used as a guide only. Many variables and factors can affect battery performance. Seek information in the guide for your device to work out Watt-Hours.


When it comes to lithium batteries, safety is a major concern due to the potential for overheating, fire, and explosion. The safest lithium battery cells are those that are designed with built-in safety features to prevent these hazards.

Topo lithium systems use a high quality, A-Grade, Lithium Iron Phosphate (LiFePO4) prismatic cells. Widely used in electric vehicles, mining equipment, rail transportation, renewable energy storage and telecommunications sector. They are considered as one of the safest lithium-ion batteries among other lithium-ion batteries.

Lithium Iron Phosphate (LiFePO4) prismatic cells are a type of lithium-ion battery that use a lithium iron phosphate cathode and a carbon anode. They are known for their high energy density, long cycle life, and high thermal stability, making them a popular choice for a wide range of applications, including electric vehicles, renewable energy storage systems, and portable electronic devices.

Prismatic cells are so called because they are made in a rectangular shape, which is different than having many small cylindrical shape cells.

Some of the key features and benefits of LiFePO4 prismatic cells include:

  • High energy density: LiFePO4 prismatic cells have a relatively high energy density, which allows for a smaller and lighter battery pack for a given energy storage capacity.
  • Long cycle life: LiFePO4 prismatic cells have a long cycle life, which means that they can be charged and discharged many times without losing capacity.
  • High thermal stability: LiFePO4 prismatic cells have a high thermal stability, which means that they are less likely to overheat or catch fire.
  • Low self-discharge rate: LiFePO4 prismatic cells have a low self-discharge rate, which means that they lose less capacity when they are not in use.
  • Low toxicity: LiFePO4 prismatic cells are made with non-toxic materials, which makes them safer for the environment.
  • Wide operating temperature range: LiFePO4 prismatic cells can operate in a wide temperature range, which makes them suitable for use in a variety of environments.

It’s important to note that even with the safest lithium battery cells, proper usage and maintenance are crucial to ensure safety. It is recommended to use lithium batteries with built-in protection circuit module (PCM) or battery management system (BMS) to ensure the safe operation and prolong the life of the battery.

 A “traditional” dual battery system is a system that uses two batteries under the vehicles bonnet instead of just one. These batteries are typically connected in parallel, meaning that the positive terminals are connected together and the negative terminals are connected together. This allows for the two batteries to work together to power the vehicle’s electrical systems, providing increased power and redundancy.

There are a few reasons why a dual battery system might be used in a vehicle:

  • Increased power: A dual battery system provides a larger reserve of power, which can be useful for vehicles that have high power demands, such as those with a lot of electrical accessories or those that are used for off-roading or camping.
  • Redundancy: Having two batteries means that if one battery fails, the other can take over and keep the vehicle running.
  • Isolation: Some dual battery systems include a battery isolator, which allows the driver to separate the batteries and use one for starting the engine and the other for running accessories. This prevents the starting battery from being drained while using accessories and ensures that the vehicle will always be able to start.

A Modern dual battery system are increasingly being installed outside of the engine compartment or “under the bonnet” for improved safety, performance, and reliability. These systems may be installed in a variety of locations, such as the rear cargo area, underneath the vehicle, or in a specialized battery box or tray mounted to the chassis or body. The benefit of moving the dual battery system outside of the engine compartment is that it allows for better heat dissipation, which can help extend the life of the batteries and improve overall system performance. Improved accessibility, and reduced risk from other hazards. Modern dual battery systems using lithium batteries are lighter, more compact than traditional lead -acid batteries. Additionally, allowing for more flexible installation options, frees up valuable engine compartment space for other components and makes maintenance and troubleshooting easier.

It is important to note that installing a dual battery system requires knowledge of electrical systems, wiring and termination. Consultation with a qualified automotive technician is recommended.

A DC/DC charger, also known as a DC-to-DC converter or simply a DC charger, is a device that converts one DC voltage level to another. It is  used to regulate and fully charge a secondary battery system from a primary battery system in applications such as automotive, marine, and RV systems.

In a DC/DC charger, the input voltage from the primary battery system is stepped down or up to a different voltage level that is appropriate for charging the secondary battery system. This is achieved using electronic components such as inductors, capacitors, and semiconductors that are configured in a specific circuit topology.

DC/DC chargers can provide several benefits over traditional AC chargers in certain applications, including improved efficiency, faster charging times, and greater flexibility in terms of input and output voltage ranges. They are commonly used in off-grid and mobile applications where access to AC power may be limited or non-existent.

Topo’s Built-in DC/DC chargers are compatible with the primary battery charging system used in all make and vehicles including smart alternators and are designed and profiled to suit the lithium batteries used in Topo’s battery systems.

When it comes to maximizing the performance and output of your Topo lithium battery system, a larger DC/DC charger is the way to go. In fact, in this case, bigger is definitely better. Upgrading from a 20A DC/DC charger to a 40A DC/DC charger will cut your charging time in half. This is especially important when your battery is flat and you need to keep remote or portable 12V accessories like a fridge or freezer powered.

It’s worth noting that not all vehicle charging systems are designed to handle additional loads beyond what’s specified by the manufacturer. In fact, a vehicle’s alternator is primarily responsible for generating electrical power and charging the starter battery while the engine is running. The alternator powers various electrical components in the vehicle, including the headlights, taillights, interior lights, audio system, and other electronic devices. It also provides power to the vehicle’s ignition system, fuel injection system, and other engine control modules.

So, if you’re looking to upgrade your vehicle’s electrical system or your vehicles is already capable and you want to get the most out of your Topo lithium battery, investing in a larger DC/DC charger is a smart move. It will help you maximize your battery’s potential and keep all of your remote and portable accessories powered up and ready to go, without draining your battery unnecessarily.

Key takeaways to consider:

  • Check existing Vehicles alternator size , Small, Medium or Large.
    We recommend Vehicles with a 60A Alternator or less to to fit a 20A DC/DC Charger
                                  Vehicles with a 80-100A Alternator to fit 40A DC/DC Charger
                                  Vehicles with a 100A+ Alternator to fit a 40A DC/DC Charger
  • Consider a 20a DC/DC charger, if you are already charging multiple sub battery systems eg. Car ( 40A D/DC) and caravan( 40A DC/DC) = 80A + continuous draw from Vehicles charging system when not fully charged, plus all additional fitted accessories.
  • Additional Cost, component wear and tear, charging system upgrades, correct wiring sizes and termination etc.
  • For 4wd and touring setups. Consider all other additional accessories fitted on your vehicle eg. Winches, Spotlights, task light, compressors, dual battery systems etc. all drawing from Vehicles alternator.

No, Topo’s Red solar input has a built-in solar regulator, also known as a solar charge controller, is a device that regulates the flow of Direct Current from a solar panel to a battery. It is designed to prevent overcharging and over-discharging of the battery, which can damage the battery and shorten its lifespan.

A solar charge controller regulates the current and voltage coming from the solar panel and ensures that the battery is only charged within its safe operating range. It also prevents reverse current flow, which can occur at night when there is no sunlight, and can drain the battery.

Topo’s Built-in solar regulators are built-in to all our lithium systems and are rated to match 12V and 24V solar panels ( open circuit voltage of 20-50V) and Max charge input of 25Amps.  If using your own additional solar controller in series please consider that Topo’s Red Solar Input is ” passive” by design and will only accept an “active” solar charge supply.

It is important to note that the solar panel, battery and load should be matched with the solar regulator capacity and specifications.

The amount of time that a battery will run a 12V fridge depends on a number of factors, including the capacity of the battery, power consumption of the fridge, duty cycle, ambient temperature and the temperature of the fridge’s contents.

A general rule of thumb, based on the assumption that the fridge is running cool, battery is in good condition and fully charged before use. The Topo 72Ah Centerfire will have a capacity of 65 usable Amps this will power an efficient  40L, 12V fridge for 2-3 days in 30°C days set at 3 degrees standalone without charge and expect the Topo’s 144Ah Long Range lithium to power the fridge for twice as long.

However, actual battery runtime will depend on several factors such as:

  • Fridge power consumption & efficiency:
    A fridge with a higher power consumption rating and poor insulation rating will drain the battery faster.
  •  A fridge with a higher duty cycle will draw more amps from our battery on average and will need to be considered calculating average amp draw an hour.
    As a guide, a typical “duty cycle” for a 12V Fridge/Freezers are: 35% duty cycle in fridge mode and 65% duty cycle when in freezer.
  • Battery capacity: The larger the capacity of the battery, the longer it will run a fridge without needing to charge.
  • Battery condition: A battery that is in poor condition or that has been over-discharged will not hold a charge as well as a battery that is in good/ healthy condition.
  • Temperature: A fridge that is warm, or filled with warm contents will need to run longer at 100% duty cycle to cool down to refrigerate at set temperature, this will drain the battery faster.
  • Voltage drop: Length of cable and size can cause voltage drop due to the cable’s resistance. This can prematurely stop powering your fridge, in particular with fridges with built-in low voltage cutoffs.

It is important to use a battery monitor to check the battery capacity and to familiarise yourself with your setup to avoid over-discharging and flattening battery.

It is also recommended to have a plan B in case of battery going flat, such as generator or another charged battery source available.

Automotive cable size and rating refer to the specifications of the electrical cables used in vehicles. The size of the cable refers to its cross-sectional area, typically measured in square millimeters (mm²) or American Wire Gauge (AWG) and or Brown and Sharp Wire Gauge (B&S). The rating refers to the maximum amount of current the cable can safely carry, measured in amperes (A).

When choosing cable size and rating for an automotive application, it’s important to consider the current draw of the device or system being powered and the length of the cable run. A larger cable size will be able to carry more current, and a higher rating will be able to handle more current without overheating.

Here is an example of a chart that shows the recommended cable size and rating for common automotive applications:

Application Recommended Cable Size (mm²) Recommended Cable Rating (A)
Headlights 2.5 20
Tail lights 2.5 20
Horn 2.5 20
Starter motor 35 150
Alternator 35 150
Battery to starter motor 35 150
Battery to alternator 35 150
Grounding 6 40


Application.                  Recommended Cable Size (mm²)  Recommended Cable Length (M)
Topo Lithium Systems 20A DC/DC 8 5-6
Topo Lithium systems 40A DC/DC 14 5-6

It’s important to note that this is just an example, and actual cable size and rating may vary based on the specific application and the manufacturer’s recommendations. It’s always best to consult the vehicle’s wiring diagram or the manufacturer’s instructions when working on an automotive electrical system.

It’s also important to use appropriate fuse holders and fuses, cable connectors and terminals with the right size and rating to ensure the cable runs are safe and efficient.

Generally speaking, automotive electrical systems typically use cables that are rated for 12V and have a capacity of 10 amps for basic auxiliary outputs, and up to 50-60 amps for more advanced systems. The size of the cable will vary depending on the amperage rating and the length of the cable run.

It’s also important to note that using the wrong size or rating of cable and poor connections can lead to electrical issues, such as overheating or insufficient power, and potentially cause burn damage to the vehicle’s electrical system.

Hello and welcome to TOPO DC Power!

Feel free to browse and find useful information about our range of Low Voltage DC Powered products and accessories.

TOPO DC Power is proudly West Australian owned and operated company.
We value sustainable business practices and offer unparalleled manufacturer know-how for our products.
We work closely and support  our business partners to ensure they receive great after-sales service and repairs.
We welcome inquiries from business owners and representatives of companies who are interested in discussing potential business opportunities and
exploring wholesale pricing options. Please feel free to contact us at your convenience to start the conversation.

The lithium battery specifications, quality and chemistry used in Topo lithium battery systems are rated and allows for seriously “FAST” Charging.

Topo lithium systems are spec’ed to our system and requirements based on our end users needs and applications while offering high quality components and matched to suit existing vehicle charging systems.

In a real case scenario:  Topo’s Built in 40A DC/DC Charger is sufficient for most and will maximise the end users battery storage potential.
Dependent on the end users traveling requirements and load profile our 72AH Centerfire will continue to to power a 12 fridge for over a month 24/7 from a driving your vehicle 30min a day.

Please not you can Charge and Discharge Topo Lithium battery systems at the same time to further increase battery systems potential.

When a battery system is stationary or parked,  Topo battery Systems will accept charge from Solar or Mains charging sources of a combined Max 25Amps/Hr.
As a guide only, subject to supplied solar panels quality, efficiency and temperature:  25amps of solar is equivalent to over 500Watts of Solar  in Peak sun, continuous.

Topo lithium battery systems will accept all available charging sources simultaneously.
Example: Topo’s Centerfire’s battery system with a 40A DC/DC + 200W Solar panel ( 10A charge) + 10A Mains charger  will charge the battery at 60A/hr .

Combination. examples:
– Vehicle 40A DC/DC + Solar 25A = 65A / hr
– Vehicle 20A DC/DC + Solar 25A= 45A / hr
– Vehicle 40A DC/DC + Mains ( 10A) + Solar 10A  = 60A/hr
– Vehicle 40A/DC/DC + Mains (20A) = 60A/hr etc.

The benefit of moving the dual battery system outside of the engine compartment is that it allows for better heat dissipation, which can help extend the life of the batteries and improve overall system performance.