Freedom Lite Marine Installation Manual Revision 1
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away from direct saltwater exposure. For applications for open deck operation such as ski
boats please contact Freedom Won for a solution.
The range is available in 13V and 26V options to suit ‘12V’ and ‘24V’ systems used in the
marine industry. 52V is also available to accommodate land-based applications where
moisture and corrosion resistance is desired such as houses located particularly close to the
coast.
The Lite Marine range is water resistant (IP65) and resistant to corrosion associated with sea
moisture exposure. Note that the product is not suitable for repeated direct exposure to sea
water contact.
The range is designed with a low profile to fit into height restricted lockers etc. All models
are supplied standard with plastic feet. It is permissible to stack the Marine models on top
of each other up to three high (this relates to land-based applications).
Table 3.1 provides an overview of the Freedom Lite Marine range. The models are classified
in terms of energy capacity [kW].
An image with numbered labels pertaining to the following paragraphs is provided in Figure
3.1. The model number denotes with the first number [1] the total energy storage capacity
in kWh of each model. The second number [2] denotes the average amount of energy in
kWh that should be withdrawn per cycle (on average) in order to optimise the life of the
lithium cells. This equates to 80% of the total for each model i.e. 80% depth of discharge
(DoD). Older models denoted a 70% DoD as in this picture.
Note that all Freedom Lite
batteries offer a maximum of 90% DoD as standard
.
The available voltage options are also provided in Table 3.1. For assistance with comparing
the Lite Marine against other batteries the Ah ratings have been provided in Table 3.2. Note
that the Ah rating of a Lite Marine need only be about half of the rating of a typical lead
battery in order to offer equivalent useful capacity performance.
The maximum and continuous current for each model is governed by the rating of the built-
in circuit breaker [3], which has been sized below the maximum current capability of the
lithium cells. Even at maximum current the temperature rise inside the battery is negligible
and no cooling of the cells is required. The time limits for operation at the maximum current
should be observed (see notes to Table 3.1). To ensure that the circuit breaker does not trip
in normal operation it is advised that the design of the system aims to remain at or below
the continuous current value.
For assistance with setting up the inverters and charge controllers please refer to Table 3.3
for the voltage values required for operation of the battery.
The BMS will command a connected inverter with CAN Bus interface to stop discharging the
battery at 10% SoC (90% DoD). Under high load the voltage may drop lower than the
estimated voltage provided in Table 3.3 whilst still above 10% SoC. The standby current
draw on the battery and the inverter can cause the battery to be discharged below 10% SoC.
