eTower Installation Manual Revision 0
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The maximum current for each model is governed by the rating of the built-in circuit breaker
and the BMS. 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 5
minutes in a 30-minute cycle. To ensure that the circuit breaker does not trip in normal
operation and to prevent overloading of the BMS power electronics, it is advised that the
design of the system aims to remain at or below the continuous current value under most
scenarios.
The absolute maximum allowable voltage when fully charged is 56V, however a more typical
inverter charge setting range is 55.5V to 55.8V, depending on the inverter voltage tracking
accuracy in preventing a voltage overshoot above 56V. The voltage normally used when
setting up the inverter for the minimum cut off is 48V, however this will not typically be
reached if operating down to 90% Depth of Discharge (DoD). The BMS will command the
compatible connected inverter with CAN Bus or RS485 interface to stop discharging the
battery at 10% SoC (90% DoD), which roughly equates to 49,0V). Under high load the
voltage may drop to 48V whilst still above 10% SoC. A voltage of 48V or even lower can be
observed in systems without a CAN Bus interface or where the standby current draw on the
inverter has caused the battery to be discharged below 10% SoC. The BMS will eventually
cut off the battery from the DC bus at around 46V to protect the cells from undervoltage.
The dimensions given are for the principal outlines of the aluminium housing and exclude
items that protrude such as the lifting handles and DC terminals.
The eTower modules are primarily designed to stand on the floor on the supplied pedestal
but if space is a problem, they can also be placed on end against a wall with the front panel
facing upwards.
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