Hardware · Comparison
SolaX Triple Power: should you install one?
Updated
SolaX hybrids and Triple Power batteries are a matched pair for new solar and for replacing a tired inverter. They are a mainstream alternative to Fox and Sunsynk rather than a premium backup appliance.
Where this kit fits
New hybrid systems where the installer can show recent SolaX commissioning, not a first attempt. It is a weak buy when households whose priority is a widely recognised backup brand and a large certified-installer network.
Households whose priority is a widely recognised backup brand and a large certified-installer network.
A September 2026 figure for SolaX Triple Power
Take an 11.6 kWh pack, cycled about 320 times, at 90% round trip. Charge at 7.0p, and value what comes back at 29.6p. Export given up is priced at 10.0p. There are no panels beside this 11.6 kWh pack, so every unit charged comes off the grid. Delivered energy is about 1440 kWh. After charging cost and lost export, the figure saves about £314 a year. Set that against £3,650 fitted, which is a September 2026 illustration at the temporary 0% residential rate, not a quote. That is a simple payback of about 11.6 years on these assumptions. Nudge the night rate up by 4p and see if you still like it.
In most single-phase houses in Britain, 3.6 kW is in the band where G98 connect-and-notify is often enough. Export can still be capped. Agree that before the inverter is ordered. The figure uses 11.6 kWh and 0 kWp, which is enough to tell two quotes apart if they assumed something else.
At a steady 600 W evening load, 11.6 kWh lasts about 19.3 hours. A 3 kW kettle only works if the inverter can deliver it. Capacity on the badge does not answer that.
VAT, paperwork, refusal
Where the job is a qualifying install in a home, the 0% rate runs to 31 March 2027 and is due to become 5% after that. This figure prices the work at £3,650 on that basis. It does not apply to a shop, and it does not apply to a battery you buy and fit yourself.
I would not pay the bulk of £3,650 before the DNO route for a 3.6 kW inverter is known.
Ask the installer for the last SolaX Triple Power they commissioned: postcode area, inverter size, and whether G99 was required. A first-ever install of this range is a risk you can choose not to fund.
Common questions
Is the price on this page a quote?
No. £3,650 is a September 2026 illustration for a 11.6 kWh example at the temporary 0% residential rate. Your survey replaces it.
Will it stay on in a power cut?
Only if a gateway or essential-load board was designed and paid for. A standard grid-tied battery turns off with the grid. On this 11.6 kWh example the inverter is 3.6 kW, and backup is still a separate line.
What paperwork should I keep?
Keep the MCS certificate where the job is certified, the electrical certificate, the DNO record, the schematic, the warranty registration and a photo of the schedule. For an illustrated £3,650 job, that folder is part of what you bought.
What if the cheap rate is not 7p?
Then the figure changes. This page used 7.0p as a charge rate and 29.6p as the rate avoided. A smaller gap means a worse payback. Read the live tariff.
Sources
Want a price for your house?
The figures above are a rough guide. An installer still needs to see your fuse board, where the battery will go, and whether you want power during a blackout.