2 INSTALLATION GUIDE
2.6 MPPT Solar Regulator
Solar Input
The BMS is designed for use with 12V solar panels (panels that have a maximum
output voltage of up to 25V). A minimum input voltage of 14V is required to start
charging from a solar source. Once charging has started, the operating voltage
range of the solar input can go as low as 9V and as high as 30V; outside of this
range, charging will stop.
Maximum Power Point Tracking
The power output from solar panels varies depending on the amount of sunlight
and the electrical load on the solar panel output. The BMS utilises a Maximum
Power Point Tracking (MPPT) algorithm on the solar input, to ensure that the
greatest charge possible is transferred from the solar panels to the battery
under charge. As conditions change, the MPPT algorithm adjusts its parameters
accordingly, in order to maintain the optimum point at which the solar panels can
deliver the most power.
Solar Connections
An array of solar panels can be connected to the BMS solar input, on the condition
that the open circuit output voltage of the array is at least 14V and does not
exceed 30V*. For this reason, 12V panels (or pairs of series connected 6V panels)
must be connected in parallel (Refer to Figure 2.6.1 and Figure 2.6.2). So long
as the voltage requirements are met, there is no limit to the number of panels
that can be connected in a solar array; however the BMS will not draw more than
260W from the solar input.
For installations with a single 12V solar panel, a blocking diode is not necessary.
For installations with an array of solar panels, please refer to the panel
manufacturer’s instructions for requirement and/or fi tment of diodes.
*Note: The maximum output voltage of a “12V” solar panel is not 12V. “12V”
solar panels are designed to be able to operate in a 12V charging system, and
thus may have an open circuit output voltage anywhere from 14V to 25V or
more.
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