USERS | SP PRO Operation
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Doc #OI0003 Part #004122 Rev 04 2010
Battery Temperature
The SP PRO monitors the battery temperature via the sensor provided. The supplied battery temperature
sensor is mounted in thermal contact with the centre of the side of the battery. If the sensor is not in thermal
contact with the battery bank the batteries will not be correctly charged. Check battery temperature is reading
correctly in the Temperature Control section of Technical Data in SP LINK.
The charge voltage set points are compensated by battery temperature. The default compensation applied is
--5.5mV/°C/cell with zero compensation at 25°C.
e.g. Initial Voltage = 55.2, Battery Temperature = 26°C, No. Battery Cells = 24.
Compensated Charge voltage = 55.2 + ((26 - 25) x -0.0055 x 24)
= 55.07
Absorption Voltage = 57.6, Battery Temperature = 6°C, No. Battery Cells = 24.
Compensated Charge voltage = 57.6 + ((6 - 25) x -0.0055 x 24)
= 60.11
During all charge stages, the compensated charge voltage will not exceed Max Voltage Limit.
Compensation improves battery performance and prevents battery overheating.
The charge current is also limited by battery temperature. Battery temperatures above 45°C cause the battery
charger to reduce the charge current limit point. This will help prevent battery overheating.
Renewable Management
In Off Grid and Mobile applications your SP PRO feeds renewable power to the AC load, and any excess
is stored in the battery for later usage. If the battery is fully charged and the DC load is not on, the excess
is wasted (the renewable power is reduced or disconnected by the external regulator). Such waste can be
reduced by tailoring your generator starting parameters to suit your individual site needs. See the generator
control parameters in Using SP LINK.
Automatic Generator Control
The SP PRO may be configured to automatically control the generator as required to supply the load and
charge the attached battery or to allow manual control of the generator by the user. Generally automatic
control of the generator is recommended for daily operation.
The generator will only run in automatic mode if your SP PRO recognises that the generator is available for
automatic operation via a digital input to the SP PRO or can be permanently enabled via an installer setting.
As part of the installation, the SP PRO settings are configured to automatically run the generator to:
• Limit the depth of battery discharge, for maximum battery life.
• Deliver energy efficiently by supplying sustained large loads direct from the generator.
• Load the generator to the highest possible level while running, to efficiently convert fuel to electricity.
• Limit generator starting frequency, which would reduce its life and increase maintenance.
• Avoid noise by starting the generator late at night only for heavy loads or a deeply discharged battery.
In the SP PRO SPS system, the SP PRO automatically runs the generator for the following reasons:
• Battery conditions, in particular state of charge (SoC), require the generator to charge the battery
• Load conditions are such that the SP PRO ratings are exceeded or a sustained load is large enough to
efficiently load up the generator hence running the generator will be the most efficient method to supply the
load. For loads exceeding the generator rating the SP PRO draws power from the battery, adding its power
output to that of the generator.
• Time Schedules are set to regularly run the generator at times of expected peak loads or at convenient times
