Solar PV and VPhase

Solar PV and VPhase Voltage Optimisation are two complementary technologies that can benefit from being installed alongside each other, reducing the overall payback period and improving the return on investment for the consumer.

The facts

  • Solar PV installations currently have widespread appeal largely due to the generous Feed in Tariffs available.
  • In the UK, there are nearly 2,000 MCS registered installers of solar PV systems.
  • VPhase Voltage Optimisation devices can be installed alongside solar PV systems.
  • With an electrician on site, the incremental time and cost of adding the VPhase is very low.
  • Installing a VPhase with a solar PV system, reduces the payback period and improves the return on investment.
  • Solar PV + VPhase = added value for the customer 
  • Solar PV and VPhase together result in a more energy efficient home

For MCS installers

Please contact one of our regional Sales Managers to discuss how you can scope the VPhase Voltage Optimisation device into your jobs. We have an extensive network of distributors and wholesalers throughout the UK from which you can buy the VPhase device. Our sales managers will also help advise about the features and benefits relating to the product and the joint benefits from combining the VPhase with a solar PV installation.

What does it actually mean?

Just by calculating the returns possible from combining a solar PV installation with VPhase Voltage Optimisation, it is clear to see the improved benefits that are possible. 
* figures based on a 2.2kw system

How is the VPhase installed alongside solar PV systems?

Due to legislation (G83/1, BS EN 50438) the embedded generation must not supply power through a VPhase VX1 optimised circuit. I.e. do not plug embedded generation directly into a VPhase optimised socket outlet or fused spur. Always connect the embedded generation to an independent circuit at the consumer unit. Legislation requires that embedded generation must be automatically disconnected if the utility (supply)voltage rises above 264V. Therefore the embedded generation must not be connected directly to a VPhase optimised circuit. An example of a consumer unit containing embedded generation is given: 

The embedded generation must not be directly connected to Voltage Optimised circuits 5 to 9. In this example an extra non-Voltage Optimised circuit has been included (Circuit 10) connected at RCD2 for the embedded generation.

Will the embedded generation continue to supply all of the electrical loads at the property? Yes

Loads on the VPhase supplied Voltage Optimised circuits will still be supplied with power from your embedded generation. Electric current will flow from your embedded generation through the VPhase and on to the Voltage Optimised circuits. The current path will be as shown:


Trade contacts

  • South West - Adrian Fishley -
  • North - Neil Morris -
  • Midlands - Daniel Laud -
  • South East - Mark Treadwell - 
More information about the return on investment potential from the VPhase alone is available HERE.

Frequently Asked Questions

We realise the VPhase device is a technical product,but to help you understand more about it and the features you can benefit from – read our Frequently Asked Questions, HERE

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