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Optional solar extras

Inverter upgrades and backup power options.

Some solar and battery installations can be enhanced with a larger inverter or emergency backup wiring. E-Fix can explain what is suitable and handle the electrical work safely.

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G98 and G99 inverter upgrades

Many standard domestic solar systems are designed around G98 limits. If you want a more powerful system, such as a 5kW or 6kW inverter, the Distribution Network Operator may need a G99 application before the larger inverter can be connected.

  • Useful when the property can benefit from higher generation/export capacity.
  • E-Fix can manage the G99 application process as part of the upgrade, although approval and timescales are controlled by the DNO.
  • Approval depends on the local network and DNO requirements.
  • We will explain the practical options before any work is agreed.

Why choose a larger inverter?

A larger inverter can allow a suitably designed solar PV system to make better use of available roof space and generation potential. It is not automatically right for every property, so it needs to be assessed against your roof layout, battery plans, usage and DNO approval.

This is best treated as an optional upgrade rather than a standard requirement.

Emergency backup circuits and full-house backup gateways

A standard solar and battery system does not always power the house during a power cut. If backup power is important, an additional emergency backup circuit or a gateway for full-house backup can be installed where suitable.

Emergency backup circuit

A selected circuit can be wired for essential loads, such as internet equipment, lighting, fridge/freezer, heating controls or medical equipment.

Full-house backup gateway

Where suitable, a gateway can help provide broader backup to the property during an outage, subject to system design and electrical limitations. Full-house backup does not necessarily mean every appliance can run at the same time.

Additional safety work is required

Backup power is more involved than simply fitting a battery. To make the installation safe and compliant, extra electrical work is normally needed.

  • Additional wiring for the backup circuit or gateway.
  • A suitable changeover switch arrangement.
  • An earth rod installation where required to make islanded/backup operation safe.
  • Testing, certification and clear handover so you know how the system behaves in a power outage.

Optional extra, not standard

Backup power is optional because not every customer wants or needs it, and it involves additional materials, wiring and safety work.

Some homes only need solar and battery storage for bill saving. Others want resilience during power cuts. E-Fix will price backup work separately so you can decide if the extra benefit is worth it for your property.

1

Talk through what you want protected

We identify whether you need essential-load backup, full-house backup, or simply standard solar and battery storage.

2

Check the electrical setup

We assess inverter size, consumer unit layout, earthing arrangements, DNO requirements and the extra wiring needed.

3

Quote the optional extras clearly

G99 applications, larger inverters, backup circuits, gateways, changeover switching and earth rod work are explained before you decide.

Want backup during a power cut?

Backup can be especially valuable for homes with medical or life-support equipment, vulnerable occupants, home working needs, internet/communication requirements, or frequent power cut concerns. Customers with critical medical equipment should also follow supplier, NHS or care-provider guidance and maintain suitable backup arrangements.

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