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The Smart PRO supports curtailment in line with BS7671 18th edition A1 section
722.311.201. a minimum of 6A is required on a maximum demand calculation even
when implementing curtailment. 32A is required if curtailment is not configured
or calibration is not possible.
Curtailment works by monitoring the external CT clamp placed around the tails
between the DNO fuse and the first consumer unit or henley block. This CT clamp
must then be checked for accuracy and calibrated if necessary.
Load curtailment functionality in the Smart Charger devices enables a varied rate
of charging to optimise use of fuse capacity. Where there are multiple devices with
high electrical demands on a property, it is particularly important for Smart Charger
Installers to validate that calibration has been performed. This is in order to comply
with safety regulations of the DNOs and situations where the house fuse may blow,
resulting in an expensive, time consuming site visit from a DNO to change the fuse
and/ or restrict charging to priority devices. It may also result in penalties from DNOs.
Assuming the steps for installation have been completed successfully, Installers
are prompted with a check for whether or not Load Curtailment is required, or if a
customer has/ is planning on having microgeneration. If any of these are required,
the charger needs to be calibrated!
It is important for an Installer to check that the device and house CT clamp readings
do not differ considerably from the manual readings taken with a calibrated handheld
clamp meter/ multimeter (or a reading from a smart meter).
Calibration check
Load Curtailment and Calibration
If the customer has bought the Smart PRO specifically to use the
solar charging or data collection features, it is vital that an external
CT clamp is installed.
It is important that the instructions in “Connecting Mains, Ethernet cable
and CT Clamp” are followed precisely. If CT clamps are installed incorrectly,
there will be inaccuracies in readings which will invariably result in customer
support queries being raised.
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