Freedom Lite Home and Business HV Installation Manual Revision 1
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Table 2.1 provides an overview of the Freedom Lite Home and Business HV and HV+ range.
There are six primary, as included in the table, but some models are available in two
voltages as distinguished by the suffixes HV and HV+ on the model name. The models are
classified in terms of energy capacity.
An image with numbered labels pertaining to the following paragraphs is provided in Figure
2.1. 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kWh that should be withdrawn per cycle (on average) in order to optimise the life of the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).
Note that all Freedom Lite batteries offer a maximum of 90% DoD as standard
.
The range is designed with a tall and slim profile with the “Home” models intended to be
wall mounted (floor mounting is also possible – all models are supplied standard with plastic
feet). The larger “Business” range is floor standing with plastic feet for the 40/32 and
aluminium feet with plastic pads on the underside for the 60/48 and 80/64. The aluminium
feet on the latter two models have a height of 100mm and allow for shifting the battery
once upright using a pallet trolley.
The Ah capacity is not provided in the table because this varies depending on the voltage
option, instead use the kWh capacity rating for sizing information.
The maximum 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 to
ensure their protection. There is no noticeable cell temperature rise during operation and
no active cooling of the cells is required. The time limit for operation at the maximum
current is 2 minutes in a 10-minute cycle. 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.
The maximum operating voltage of each battery model is 112% of the nominal voltage and
the minimum operating voltage is 88% of the nominal voltage.
The BMS will command the connected inverter with the CAN Bus interface to stop
discharging the battery at 10% SoC (90% DoD), which roughly equates to 88% of the nominal
voltage). Under high load the voltage may drop lower whilst still above 10% SoC. The
battery breaker will eventually trip the battery at around 80% of the nominal voltage to
protect the cells from undervoltage.
