Technical information

Complete lithium systems – the new era of mobile power!

Save space, reduce weight, and get more efficient energy for DC and 230VAC high-consumption equipment onboard with lithium-ion batteries. Compared with traditional systems the LPS batteries weigh a fraction of the AGM lead batteries whilst providing double the amount of energy for consumption – and lasting more than six times longer on average. Charging times are very short, and lithium technology provides perfectly reliable mobile power solutions that may function as both main and backup power systems for various equipment.

Charging a lithium ion battery from an alternator is both efficient and fast compared to lead acid. The only requirement is a CDR Battery Separator or Converter between the starter battery and lithium ion battery. Lithium battery packs are built up by a number of individual lithium cells which must all maintain the same voltage for the battery to stay functional. Therefore, all lithium power solutions from Perpetual V2G Systems have an integrated Battery Management System (BMS) that automatically balances the cells during charge, discharge and in idle mode. The BMS monitors the voltage and temperature of each lithium ion cell which influences the functionality of the battery. Our BMSs include an electronic MOSFET based safety breaker that prevents short circuits, for safe and reliable use. Just plug the lithium battery in, and you’re ready to go.

Tech Specs User Manual

e0b56864d079ae7ccd998bf8ca642d59Capacity comparison chart

Where the lithium-ion battery technology makes 80% of the rated capacity available, lead-acid technology only makes 30-50% available. This means you need twice the rated capacity of lead-acid to match the available capacity of lithium.


Weight comparison chart5b035b5730d4ee0a184ede92453705f3

Lithium weights only a third of lead-acid and has significantly less volume.


ace4ea0782753a03221785494c95a4b8Total CO2 development

When comparing CO2 emissions of the lithium-ion battery and idle running solution over the system lifetime, a CO2 saving of approximately eight tons is achieved by using our lithium system.

This calculation is made on the basis of a duty profile of 500W, 2 hours a day. When using the lithium system, the system is charged while driving. This requires a small amount of extra fuel, which gives a small CO2 emission.

Additional technical information

Battery Management System

Each lithium battery has a built-in Battery Management System ensuring full control and safety. The BMS monitors lithium cell activity and uses the information for safety, maintenance, SOC, and interface control.

Overload protection

The advantage of the internal MOSFET safety breaker is its capability to disconnect high currents without damaging the main switch. The BMS can use the MOSFET safety breaker for overload protection without damaging the cells.

Cell balancing

The advanced SOC calculation ensures that all cells are kept in a balanced condition at all times. The BMS has a high cell-balance current that reduces the need for active cell balancing and restore the cells to a balanced condition faster. The BMS provides cell balancing of each single cell in charge, discharge and idle mode.


Each lithium battery has an extended interface that allows it to control power distribution for different consuming appliances. The interface can control alternative chargers, solar panels, gen-sets, and other charging devices. The control of external devices is ensured via several communications, wake-ups, input and output pins.

Configurable outputs

The output pins can be configured via PC software to be triggered in occasion of different events caused by cell voltage, cell temperature, current and/or SOC levels.


When the lithium battery is not in use, the BMS enters a low power state. In this state the BMS keeps power consumption ultra-low to avoid further discharge of the lithium cells. The BMS can be re-activated through several wake-up high/low input pins and change currents plugging into the battery.