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Up to 25% EXTRA generation from your  Solar

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 Voltage Management

How can Voltage Management Help?

If your site is being supplied with electricity at a higher voltage level than you need, you could be wasting energy and money, and be responsible for greater emissions than necessary.

Electrical equipment can sometimes consume more power at higher voltages. Voltage management reduces the voltage of the electricity supplied to equipment, minimising consumption while remaining within the operating conditions specified by the equipment manufacturer.

Basic electrical laws mean the power required by certain loads is proportional to the square of the voltage. A supply voltage in excess of the nominal 400/230V may result in excessive energy consumption.

What is Voltage Management?

Voltage management is an umbrella term covering various distinct technologies, including voltage optimisation, voltage stabilisation, voltage regulation, voltage power optimisation, or voltage reduction.

How does it work?

The basic principal of all voltage management equipment is to reduce the voltage level from that of the incoming supply. To achieve this change in voltage level, an electrical transformer is required. The ratio of primary to secondary windings of these electrical transformers is set to provide the desired level of voltage reduction. Whilst there are a range of manufacturers and various specifications of voltage management equipment, it is this fundamental device which sits at the heart of the equipment.

Why might my supply voltage be higher than necessary?

Until 1995, the statutory supply specification in the UK was 415/240V ±6% (i.e. phase voltage (Vp) within the range 226-254V). The vast majority of the electrical distribution network has been in place for many years and was designed to deliver electricity within this range. There are many sites across the UK where the phase voltage is normally in excess of 240V. Historically the supply voltage in mainland Europe has been 380/220 volts with a typical tolerance of ±6%.

Steps to harmonise voltage levels were taken in 1995 when the statutory supply specification in the UK changed to 400/230V+10% -6%. This remains the current UK position today. To simplify the market for electrical equipment further, the European Union has introduced the Low Voltage Directive (LVD) 2006/95/EC to regulate the normal operating voltage of electrical equipment to be supplied in Europe.

Equipment that meets this standard bears the CE mark and is designed to operate with a nominal supply of 230V. Electricity Quality and Supply Regulations (EQS) will harmonise supply voltages across Europe at 400/230V±10%, i.e. Vp within the range 207–253V (current guidance from DECC suggests this will happen in the UK during 2011/12). This means any piece of equipment with the CE mark can be safely operated on the local electricity supply anywhere in Europe.

Therefore in the UK, where supply voltages have historically been higher, equipment made for European markets is often used at a higher voltage than it is optimised for. As a result the equipment may be consuming more energy than is necessary.

 Solar PV Plus

How does the PV+ help?

By monitoring the incoming supply voltage, the PV PLUS unit allows the Solar PV inverter to compliantly stay in circuit for longer, preventing nuisance over voltage shut down and keeping you generating for longer. Meaning a faster return of investment for existing and new systems alike. Additionally, as excessive voltage is given up as heat in electrical appliances, running the PV inverter closer to it’s designed voltage will reduce stresses caused by overheating and potentially help increase it’s operating life.

Is the Solar PV Plus G83 Compliant and Why the PV+ is NOT a Voltage Optimiser?

G59/3 – Salient points relating to Voltage Optimising equipment

ENA Engineering Recommendation G59 Issue 3 Amendment 1 2014

7.7 Voltage Management Units in Customer’s premises

7.7.1 Voltage Management Units are becoming more popular and use various methods, in most cases, to reduce the voltage supplied from the DNO’s System before it is used by the Customer. In some cases where the DNOs System voltage is low they may increase the voltage supplied to the Customer. Some technologies are only designed to reduce voltage and can not increase the voltage.

7.7.2 The use of such equipment has the advantage to the Customer of running appliances at a lower voltage and in some cases this can reduce the energy consumption of the appliance. Some appliances when running at a lower voltage will result in higher current consumption as the device needs to take the same amount of energy from the System to carry out its task.

7.7.3 If a Voltage Management Unit is installed between the Entry Point and the Generating Unit in a Customers Installation, it may result in the voltage at the Customer side of the Voltage Management Unit remaining within the limits of the protection settings defined in section while the voltage at the Entry Point side of the unit might be outside the limits of the protection settings. This would negate the effect of the protection settings. Therefore this connection arrangement is not acceptable and all Generating Units connected to DNO LV Systems under this Engineering Recommendation must be made on the Entry Point side of any Voltage Management Unit installed in a Customers Installation.

7.7.4 Customers should note that the overvoltage setting defined in section is 4% above the maximum voltage allowed for the voltage from the DNO System under the ESQCR and that provided their Installer has designed their installation correctly there should be very little nuisance tripping of the Generating Unit. Frequent nuisance tripping of a Generating Unit may be due to a fault in the Customers Installation or the operation of the DNO’s System at too high a voltage. Customers should satisfy themselves that their installation has been designed correctly and all Generating Units are operating correctly before contacting the DNO if nuisance tripping continues.. Under no circumstances should they resort to the use of Voltage Management Units installed between the Entry Point and the Generating Unit.