Energy Ace Voltage Optimisation Device

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Energy Ace single phase voltage optimisation device that saves up to 20% in electricity costs and is guaranteed to save 10% or you get your money back!

  • Features

    Energy Ace single phase voltage optimisation device that saves up to 20% in electricity costs and is guaranteed to save 10% or you get your money back!

    The 63A voltage optimiser is a lightweight (14.5kg) and compact product that is 215x340x115mm (HxWxD) fits in-between your utility metre and consumer unit. It reduces and optimizes the voltage, making any electrical equipment operate more efficiently. The 100A version is heavier at 24kg and bigger at 280x410x150mm (HxWxD).

    On average the typical electricity supply in the UK is 242V but most electrical products operate just as effectively on 216V. This product reduces the voltages and prevents wastage. 

    Suitable for use in homes and business, this product pays for itself, helps to reduce CO2 and prevents over powering of electrical products which allows them to last longer.

    Money Back Guarantee

    We offer guaranteed annual energy savings of 10% with this product or you get your money back. Certain conditions apply with this which are available on request. Requires no maintenance and is easy to install.

    Key Features

    • Available in current rating: 63A or 100A and other larger sizes which can be made to order.
    • Single phase version.
    • Three phase versions are also available on request. With energy efficiency and ROI report tailored to your business needs.
    • Output voltage is set during installation with a choice of -10V, -15V, -20V or -25V depending on your individual requirements.
    • Fitted with over current protection
    • Integrated isolation
    • Amendment 3 Compliant
    • Temperature range: -10 to 60 degrees C
    • Weight: 14.5kg at 63A and 24kg at 100A
    • Manufactured in the UK
    • Manufacturer: Energy Ace
    • Guarantee: 5 years

    General Q&A

    Q) How do I know if I need the 63A or 100A version?

    A) The best thing to do is measure your current with a clip on ammeter. Generally most properties in the UK with up to 4 bedrooms would suit the 63A unit.

    Q) You state that it can save unto 20% by reducing voltage. Most power appliances that account for a high percentage of electrical usage require a fixed amount of energy (e.g. Kettle, Tumble dryers, Immersion heaters). The energy input is: Watts, i.e. Volts x Amps. All that reducing volts will do is for it to take longer for the appliance to perform its task, the same amount of power and cost will be used.

    A) Most resistive loads like the kettle & immersion heater will not save energy through voltage optimisation (also known as voltage management) as the resistive load would normally have a defined task to perform that is controlled by a thermocouple ie boil water.

    In these examples the power level will reduce although the task would take slightly longer therefore consuming the same amount of energy. However, if the resistive load was energised permanently or switched on and off manually, the savings can be considerable.
    Plus we should remember, a 2KW heater is rated 2KW at 230V, the nominal voltage for the UK which is 230V. If your voltage is 250V for example 2KW (2000W) heater / oven / hand dryer / curling tongs / toaster etc is actually running at 2.36KW (2360W) and more susceptible to deterioration and early failure as it is operating towards the top end of its design capabilities.
    And yes, in some respects we are reducing the output of some loads although only bringing them in line with where they should be.
    In the case of the tumble dryer, the savings would more likely be within the motor windings and not in the heater although again, there are benefits as an appliance operating at 250V is receiving a much higher pressure to perform the same task as it would be receiving a lower controlled pressure.     

    Q) The official voltage in the UK is 230V AC. Would you send me some supporting information as to why you believe this device could save 20% and some case studies as to where it has.

    A) Please check out the 'Data Sheets & Brochures' dropdown which contains examples of our energy calculator for the 63A and 100A versions as well as two independent guides from BEAMA and the Carbon Trust.

  • Specifications & Dimensions
    Amp Rating
    Energy Ace
    Dimensions Located Below Specifications Table
    Product Type
    Voltage Optimizer
    Sku CVO***-1P

    63 Amp

    • Width: 340mm
    • Height: 215mm
    • Depth: 115mm

    100 Amp

    • Width: 410mm
    • Height: 280mm
    • Depth: 150mm
  • 1 Review Rating: 100%
  • Product Questions & Answers 4

    Product Questions & Answers

    Set Descending Direction
    Can this be used on a PV solar install with battery Storage at a house?
    Question by: PJ on 21 May 2022, 21:59
    I've double checked and the answer is yes. This is a popular choice for renewable energy applications. Let us know if you require any further information.
    Answer by: Chris Horridge (Admin) on 25 May 2022, 16:08
    How do you know whether the 63amp or the 100amp is more suitable for your house, what are the criteria needed for each one please?
    Question by: Mrs Westbrook-Finch on 25 Nov 2022, 14:29
    Great question! You'd get an electrician to use a clamp metre to measure how many amps your using. If it's below 63amp, you can use this version which is the popular size for domestic applications.
    Answer by: Chris Horridge (Admin) on 26 Nov 2022, 09:07
    If i fit the 63A version, but then start using more electricity, perhaps to charge an EV or similar, and pull more then 63A through it, what will happen?
    Question by: James on 2 Mar 2023, 18:18
    The unit will trip out, each voltage optimiser has MCB protection, therefore if the device pulls more than 63A it will trip the power to the property.

    I'd recommend measuring your full load current with a clamp meter and seeing how close you are to the 63A with your existing load. If you're close to 63A you'd be better off with the 100A version to future proof it.
    Answer by: Chris Horridge (Admin) on 2 Mar 2023, 19:45
    Hi , I was wondering if the volts optimisers are Energy Saving Trust approved ? thank you
    Question by: Mr D Brooks on 18 Aug 2023, 13:15
    They are not, we haven’t been asked that before.

    I’ve had a look at their website and there isn’t anything about Voltage Optimisation on there.
    Answer by: Chris Horridge (Admin) on 21 Aug 2023, 11:31

    4 Item(s)

    Show per page
  • Data Sheets & Brochures
    Product Attachments
    Brochure energyace-compact-brochure.pdf
    Energy Savings & ROI 63A Energy Savings & ROI 63A
    Energy Savings & ROI 100A Energy Savings & ROI 100A
    BEAMA - Guide to Voltage Optimisation Systems BEAMA - Guide to Voltage Optimisation Systems
    Carbon Trust - Voltage Management Explained Carbon Trust - Voltage Management Explained
  • Product Codes
    • CVO63-1P - 63A
    • CVO100-1P - 100A
Related Articles

Free Delivery

Applies to orders over £50 excluding VAT. If the order is below £50 a delivery charge of £5 +VAT will be added for a 1-3 day tracked service.

Guaranteed next working day deliveries are available from £7 +VAT and free for orders over £150 +VAT, depending on the warehouse location. See delivery zones below for Scottish Highlands and International shipping zones. This applies to orders up to 30kg in weight.

Click & Collect

You can collect your order from our warehouse which is located at Unit 4A Buckley Rd Ind Est, Buckley Road, Rochdale, OL12 9EF.

Our warehouse opening hours are:

  • Monday to Thursday: 8AM - 5PM
  • Friday: 8AM to 4PM
  • Saturday: 9AM to 12PM

Courier & Tracking

We use  DPD Local for all of our deliveries apart from heavier palleted goods. If you insert your mobile number at checkout, you will receive a text message to confirm your delivery date the day before the delivery. On the delivery day you'll receive further text updates including a 1 hour delivery slot. If you're not available you can arrange a different date or alternative drop-off point with DPD. Tracking information and order updates will also be available in your customer order area.


DPD Local provide a contact-free delivery service. Our warehouse and delivery network will remain open. This includes lock downs.

Export Information & Brexit

We're proud to offer a worldwide delivery service to any location in the known universe. Simply input your delivery details in the checkout and the shipping costs and relevant taxes will be calculated. A breakdown of delivery costs and zones can also be located below.

Delivery Zones

Zone 0

Standard UK mainland areas. Free delivery on orders over £50 excluding VAT.

Zone 1 UK

Charged at £7 excluding VAT and free on orders over £150 excluding VAT. Includes the following areas:

  • Channel Islands; Guernsey & Jersey (please select these from the Country list (not UK)
  • Isle of Man
  • Isle of Wight
  • Northern Ireland
  • Scottish Highlands, areas which we class as zone 1 are post codes: AB30-38, AB44-56, FK17-99, G83, IV1-28, IV30-32, IV33-39, IV52-54, IV63, KW1-14, PA21-33, PA34-40, PH18-26, PH30, PH31-41, PH49-50
  • Scottish Islands: HS1-9, IV40-51, IV55-56, KA27-28, KW15-17, PA20, PA30, PA32-34, PA41-49, PA60-78, PH42-44, ZE1-3

Zone 1 EU - Same rates as Zone UK

  • Republic of Ireland

Zone 2

Charged at £12. Includes the following areas:

  • Austria
  • Belgium
  • Denmark
  • France
  • Germany
  • Luxembourg
  • Netherlands

Zone 3

Charged at £25. Includes the following areas:

  • Czech Republic
  • Italy
  • Slovakia
  • Spain

Zone 4

Charged at £30. Includes the following areas:

  • Estonia
  • Finland
  • Hungary
  • Slovenia
  • Poland
  • Portugal
  • Sweden

Zone 5

Charged at £40. Includes the following areas:

  • Bosnia
  • Bulgaria
  • Croatia
  • Greece
  • Iceland
  • Latvia
  • Lithuania
  • Romania
  • Serbia

Zone 6

Charged at £60. Includes the following areas:

  • Norway
  • Russia
  • Switzerland
  • Ukraine

Zone 7

The rest of the world is charged at £80.

Cut Off & Delivery Times

If your order is placed before 3PM Monday to Thursday and before 2PM on Friday it will usually leave on a next day delivery service. This is providing that all of the items are in stock, we have live stock data on each product on our website. If your order is particularly urgent please choose the next working day option or part shipment option were we ship the items we have in stock and send the rest when they arrive. These as a guaranteed delivery services, if your delivery doesn't arrive, we'll refund the delivery charge. We prioritise next day deliveries over standard orders and will contact you if any goes wrong with the order.

If we are out of stock of any items you will receive a notification by email. If the items are delayed by longer than a week then we will notify you of this. We can also arrange for direct shipments from some of our manufacturers, if we are out of stock and you need something urgently please contact us and we will offer the fastest delivery options.

Next day deliveries are classed as next working day and don't include weekends. We also offer Saturday AM and Saturday all day services which are available at the checkout for zone 0 addresses. A Sunday service is also available on request, or you can place a Saturday delivery and change the delivery date directly with DPD via their App after you receive your tracking information.

Returns can now be generated within the customer order area here. Simply select your order from the dropdown menu along with a reason for return. Your return will then get processed quickly and efficently. Alternatively email us at: [email protected] with your order number and reason for return and we'll send you a returns authorisation form.

Returns & Cancellations

If you’re not satisfied with your goods and would like to return them, we will accept them back at the customer's expense. All unwanted goods must be returned in 100% resalable condition and within 30 days. Resalable condition includes no markings on the wires or terminals and no damage to the packaging.

To cancel your order please contact us immediately as we process and ship most of orders immediately, we're fast!

How to Return

Please log-in to your account and follow the simple process to generate a returns request. Or email our team at: [email protected]. We recommend returning goods using a recorded delivery method.


Refunds will be issued within 14 days of receipt of goods. Refunds of delivery costs will not be issued unless the products are defective.

Shortages & Damaged Goods

Shortages and damaged goods must be notified within 48 hours preferably by email to  [email protected] or Tel: 01706 860011.