Ultimatron LiFePO4 25.6V 200Ah + Heater

• 5,120 Wh energy storage: plenty of available energy for an extensive camper, boat, or off-grid installation.
• 25.6V system voltage: suitable for powerful 24V systems with lower current than a comparable 12V system.
• 200Ah nominal capacity: ample battery capacity for longer periods without shore power.
• Integrated heating: supports battery charging at low temperatures.
• Bluetooth 4.0: read important battery data via a smartphone or tablet.
• Integrated BMS: monitors the cells and protects the battery against various unsafe situations.
• Maximum 200A continuous discharge current: suitable for installations with larger consumers and powerful inverters.
• More than 6,000 cycles at 80% depth of discharge: designed for a long service life with regular charging and discharging.
• IP65 housing: protected against dust and water jets.
• 5-year manufacturer's warranty.

This Ultimatron 24V lithium battery is intended for larger electrical installations where a lot of energy needs to be stored and where a powerful inverter or multiple electrical consumers are used.

• Campers and self-built campers with an extensive 24V electrical installation.
• Electric cooking via a suitable 24V inverter.
• Use of laptops, charging equipment, lighting, and household appliances.
• Compressor refrigerator, water pump, ventilation, and diesel heating.
• Off-grid systems that need to function for several days without shore power.
• Boats with a 24V onboard system or a separate 24V domestic installation.
• Installations with solar panels, alternator charging, and a 24V shore power charger.

The battery has a nominal voltage of 25.6V and a nominal capacity of 200Ah. Thus, the nominal energy content is:

That corresponds to approximately 5.12 kWh nominal energy storage. How long you can stand free with this depends on daily consumption and the amount of energy recharged via solar panels, alternator, or shore power.

A 24V system at the same power has approximately half the current of a comparable 12V system. This can reduce cable losses and allow for more practical setup of higher power systems.

LiFePO4 cells should normally not be charged when the cell temperature is below 0°C. This Ultimatron UBL-24-200H is therefore equipped with integrated heating foils.

The heating function starts automatically when:

• the battery temperature is below 0°C;
• an external charging source is connected;
• approximately 7A or more charging current is available.

The supplied charging energy is first used to bring the battery up to temperature. According to the manufacturer, the heating does not use stored energy from the battery itself.

The operating range of the heating is from -35°C to +5°C according to the datasheet. Once the battery has warmed up sufficiently, the normal charging process can begin.

The battery features integrated Bluetooth 4.0 monitoring. Through the corresponding app, you can view important battery data on a smartphone or tablet.

Depending on the data available in the app, you can gain insight into:

• current battery voltage;
• charge or discharge current;
• calculated state of charge;
• temperature;
• individual cell voltages;
• status of charging and discharging;
• any BMS notifications.

The integrated Battery Management System monitors the battery and protects it against, among other things:

• excessive charging voltage;
• too low battery voltage;
• too high charge or discharge current;
• short circuit;
• overheating;
• charging outside the permitted temperature range.

Only use chargers suitable for a 24V LiFePO4 battery and that can be correctly set for the charging voltages of this Ultimatron battery.

The total charging current from all connected charging sources combined must not exceed the maximum charging current of the battery. This includes the combined current from:

• the shore power charger or inverter-charger;
• the MPPT solar charge controller;
• the DC-DC charger from the alternator;
• any additional charging sources.

According to the datasheet, the battery can continuously deliver a maximum of 200A. This allows the battery to be combined with powerful 24V loads and inverters, provided the entire installation is correctly designed for it.

The maximum current of the battery does not automatically determine what current can flow safely through the rest of the installation. The cable cross-section, cable length, connections, main switch, busbars, and fuses must also be matched to the maximum load.

According to the datasheet, a maximum of:

• 2 batteries in series can be connected;
• 4 batteries in parallel can be connected.

With two batteries in series, a nominal system voltage of 51.2V is created. With multiple batteries in parallel, the system voltage remains 25.6V and the total capacity increases.

Please contact us in advance if you want to combine multiple batteries. The correct setup depends on the desired system voltage, inverter power, charging sources, and maximum current.

The battery has a sturdy ABS housing and M8 connection terminals. When determining the mounting location, consider the weight, dimensions, accessibility of the connections, and sufficient space for the battery cables.

• Mount the battery securely so that it cannot shift during driving.
• Protect the connection terminals against short circuits and falling metal objects.
• Use appropriate M8 cable lugs and correctly crimped battery cables.
• Avoid mechanical stress on the connection terminals.
• Place the main fuse as close as possible to the positive battery terminal.
• Ensure that cables cannot chafe, kink, or come loose.
• Keep the battery accessible for inspection and maintenance of the connections.

Without active heating, the battery may not be charged below 0°C according to the datasheet. Discharging is possible down to -20°C. The integrated heating is intended to bring the battery to a safe temperature before charging.

• A suitable 24V inverter or inverter charger.
• A 24V DC-DC charger for charging while driving.
• An appropriate MPPT charge controller for the solar panels.
• A main fuse, matched to cables and maximum load.
• A suitable battery switch for the maximum DC current.
• Busbars or distribution rails with sufficient current capacity.
• Correctly dimensioned and professionally crimped battery cables.
• A separate battery monitor with shunt for accurate energy measurement.
• A 24V to 12V converter if 12V loads are used.

• Charging the battery with an incorrect charging program or too high a charging voltage.
• Not summing the total current from multiple charging sources.
• Using the battery directly without an appropriate main fuse.
• Using battery cables that are too thin or too long.
• Using a main switch or busbar with insufficient DC current capacity.
• Tightening battery terminals too much or not enough.
• Using the maximum BMS current as normal operating current without margin.
• Connecting a 12V consumer directly to a part of a 24V battery bank.
• Combining different battery types, ages, or states of charge in parallel.
• Not accounting for the inrush current of a powerful inverter.
• Expecting the internal heating to work without sufficient external charging current.

How much energy does this Ultimatron 24V 200Ah battery contain?
The nominal energy content is 5,120 Wh, or approximately 5.12 kWh.

Can I use this battery for electric cooking?
Yes, within a well-designed 24V installation with a suitable inverter, sufficient cable cross-section, appropriate fuses, and adequate charging capacity. The actual usage time depends on the power and usage duration of the hob and other loads.

Can the battery be charged in freezing conditions?
The battery has integrated heating. According to the manufacturer, this starts automatically below 0°C when an external charging current of approximately 7A or more is available. The battery is first heated before normal charging begins.

Does the heating use energy from the battery?
According to the datasheet, the heating uses energy from the external charging source and not the stored energy from the battery.

What charging voltage should I set?
The recommended charging voltage is 29.2V. The charging source must be suitable for LiFePO4 and should not perform automatic equalization or desulfation functions.

What is the maximum charging current?
The recommended charging current is 40A. The maximum permissible charging current is 100A according to the datasheet.

What is the maximum discharge current?
The battery can continuously supply a maximum of 200A. The rest of the installation must also be suitable for the actual current encountered.

Can I read the battery via my phone?
Yes, the battery features integrated Bluetooth 4.0 monitoring and can be read with a corresponding smartphone app.

Do I still need a separate battery monitor?
The Bluetooth app displays important battery data. For independent and accurate measurement of all charged and consumed energy, a battery monitor with a shunt can also be installed.

Can I combine multiple batteries?
According to the datasheet, a maximum of two batteries can be connected in series and a maximum of four batteries in parallel. Have the entire installation checked beforehand to ensure it is suitable for this.

Is this battery suitable as a replacement for a 12V battery?
Not directly. This battery has a nominal voltage of 25.6V and is intended for a 24V installation. For existing 12V loads, a suitable 24V to 12V converter is required.