JUICE Li-Ion Battery Advantages over Lead Acid
JUICE Li-Ion Battery Advantages over other Li-ion Batteries
With greater energy density than lead acid technologies Lithium Ion batteries are around 1/3 of the physical size of lead acid, while also having more usable energy.
Greater energy density also means that Lithium Ion weighs around 1/3 of the weight of traditional lead acid batteries for a given a/hr rating.
MORE USABLE ENERGY
Unlike lead acid batteries which ideally are not discharged below 50%, Lithium Ion allows you to discharge the battery to 80% DOD (depth of discharge) without affecting the cycle life of the battery.
GREATER CYCLE LIFE
Lithium Ion batteries are designed to offer 3000 cycles to 80%DOD. This compares to around 300-500 cycles for a lead acid battery (depending on quality) to only 50% DOD. This equates to between 5 to 9 times more energy available from a Lithium Ion battery compared to a lead acid battery of the same capacity rating. – Only achievable with suitably designed BMS / Cell Balancer.
Lithium Ion accepts considerably more charge current for longer than lead acid technologies. Therefore it is possible to recharge a Lithium Ion battery from 80% DOD to fully charged in one hour with a suitable charging system, as opposed to lead acid technologies which can take 7-8 hours from 50% DOD irrespective of the charging system. – Only achievable with suitably designed BMS / Cell Balancer.
LOWER LIFE COST
While Lithium Ion batteries are more expensive to initially purchase than lead acid batteries, they have a greater cycle life and therefore the amount of energy they can deliver through their life (3000 cycles to 80% DOD) makes them less expensive per amp hour of energy than any lead acid battery. . – Only achievable with suitably designed BMS / Cell Balancer.
Lithium Ion technology also provides great voltage stability. Even under very large loads terminal voltage remains higher and does not collapse like lead acid battery types. This make the technology very good in applications with short high current loads such as inverters, thrusters and winches.
HIGH TERMINAL VOLTAGE
Along with good voltage stability, Lithium Ion also has a higher terminal voltage than lead acid batteries making loads run more efficiently and drawing less current. Nominal voltage on a Lithium Ion battery in a 12V system is 13.2V (4 cells at 3.3V each) compared to 12V (6 cells at 2V each) on a lead acid battery. 24V Lithium Ion systems have a nominal voltage of 26.4V.
Juice Lithium Ion batteries are designed for parallel operation to allow larger battery banks to be installed from the 12V 100a/hr, 200a/hr and 24V 200 a/hr models.
Integrated series balancing allows Juice Lithium Ion Professional Series batteries to be installed in series where high DC voltages are required.
INTEGRATED BI-DIRECTIONAL ACTIVE CELL BALANCING
Each battery is equipped with an integrated cell balancing system that actively moves current between cells to ensure that not only is each cell balanced, but that the battery is able to provide its rated capacity. This differs from many passive balancers which reduce the overall battery capacity to the lowest cell in the battery.
INTEGRATED BATTERY MANAGEMENT SYSTEM (BMS)
Managing a Li-Ion battery is essential to ensure that it delivers all the advantages they are designed to offer. The integrated Juice BMS continually monitors individual cell voltages, currents and temperatures, and manages each cell to maximise it's performance. Any information of importance to the user is displayed on the Juice Lithium Ion System Monitor.
INTEGRATED BATTERY MONITORING
Given the characteristics of Lithium Ion batteries is different to lead acid batteries, each Juice Lithium Ion battery incorporates its own battery monitor to display battery voltage, current and state of charge (SoC) on the Juice Lithium Ion System Monitor. Pre-alarms and messages are displayed on the Juice Lithium Ion System Monitor to notify of low SoC before the load is disconnected if no action is taken.
INDIVIDUAL CONTROL OVER LOADS
& CHARGE SOURCES
Juice Lithium Ion batteries offer individual control over both battery loads and battery charge sources. This is extremely important to ensure charge sources are not disconnected from the battery when the battery has low SoC and disconnects itself from the load. This can then lead to more significant implications if one of the charging sources is an engine alternator, which if abruptly disconnected from the battery, can cause voltage spikes which may cause damage to connected electronic loads. The Juice BMS will only disconnect the load in the event of low SoC and only the charge sources in the event of a charging issue.
INTEGRATED BATTERY INPUTS & OUTPUTS
For increased functionality of the system each battery is fitted with battery input and output relays. The input relays allow for external signals to control your Juice Lithium Ion batteries, while the output relays allow external control from you Juice Lithium Ion batteries. An example of this is an automatic generator start and stop controlled directly from the battery based on the batteries SoC.
UNIQUE SYSTEM TEST FUNCTION
Making sure your electrical system is working correctly is essential. Juice Lithium Ion batteries are fitted with a test function, which with a single push of the button, tests the entire Juice system including the BMS, cell balancing and functionality of the battery load contactor and output relays. Test results are shown on the Juice Lithium Ion System Monitor.
While communication within the Juice battery system uses JuiceBus, an NMEA output on the display allows for information from your Juice Lithium Ion battery system to be displayed on third party equipment/monitoring screens that accept NMEA protocol. This feature allows integration of Juice Lithium Ion batteries to the rest of the ships system.