Sunsynk SUN-BATT-5.32 (wall-mounted REPT model, v2 document)

By Daan Haket · researched and written with an AI assistant · updated 26 October 2026

Sunsynk uses several similar battery names. This page is specifically about the wall-mounted SUN-BATT-5.32 REPT model, not the newer L5.3, G5.3 or W5.3 batteries.

Research from manufacturer documents, not a hands-on test. Values and missing details are kept separate below.

What matters on your quote

The original Sunsynk sheet below is a scanned manufacturer document hosted by UK distributor CEF. Its nominal battery power and maximum battery power are different figures; neither is a guaranteed continuous AC output for an unspecified inverter. The sheet does not give a separately labelled usable capacity or complete UK warranty.

• The support compatibility matrix groups SUN-BATT models separately from the L/G/W family. Similar energy figures do not make them interchangeable.
• Do not treat a cycle-life test claim as a guaranteed number of cycles or copy a South African warranty onto a UK installation.
• Before a deposit, ask for the exact model, usable energy, matching inverter, UK battery warranty and any registration deadline.

At a glance

Not in the documents we checked so far: usable capacity, continuous / rated power (original units and basis), peak power, round-trip efficiency, warranty (years), warranty throughput / cycles, capacity at end of warranty, coupling, expandable to, backup power, UK list price.

Ask the installer before you sign

• Is the usable capacity on the quote the figure above, or a nominal one?
• Can it charge fast enough to fill in your cheap window? Charging power × hours of the window is the most it can take in.
• Is any equipment needed for backup in a power cut included in the price?
• Does it work alongside your current solar inverter, or replace it?
• Which warranty conditions apply in the UK, and what do you have to do to keep them?

Will it pay back for you?

Try it in the calculator →

Usable system capacity is not established here, so the calculator opens without a battery-capacity preset. Enter the usable capacity from your installer’s quote. Add your own installed price and tariff. If the datasheet does not state a round-trip efficiency, use your installer’s figure.