Hardware · Comparison
Sunsynk hybrid: should you install one?
Updated
Sunsynk hybrids are often paired with rack batteries such as Pylontech. The inverter is the brain and the battery brand can vary, which is flexible and also a warranty jigsaw.
Where this kit fits
Confident buyers who want a known hybrid platform, rack batteries and an installer who programs time-of-use charging properly. It is a weak buy when anyone who wants a single manufacturer to phone for every part of the system.
Anyone who wants a single manufacturer to phone for every part of the system.
A September 2026 figure for Sunsynk hybrid
Take a 10 kWh pack, cycled about 300 times, at 90% round trip. Charge at 11.0p, and value what comes back at 28.4p. Export given up is priced at 8.0p. About 1714 kWh a year of the charge is treated as spare solar from 4 kWp that might otherwise have been exported. Delivered energy is about 2700 kWh. After charging cost and lost export, the figure saves about £516 a year. Set that against £6,880 fitted, which is a September 2026 illustration at the temporary 0% residential rate, not a quote. That is a simple payback of about 13.3 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 10 kWh and 4 kWp, which is enough to tell two quotes apart if they assumed something else.
At a steady 600 W evening load, 10 kWh lasts about 16.7 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 £6,880 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 sign off a 10 kWh install from a video call. Someone has to open the consumer unit.
Ask the installer for the last Sunsynk hybrid 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. £6,880 is a September 2026 illustration for a 10 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 10 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 £6,880 job, that folder is part of what you bought.
What if the cheap rate is not 7p?
Then the figure changes. This page used 11.0p as a charge rate and 28.4p 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.