Growatt ARK 5.1XH-A1 (two ARK 2.5H-A1 modules plus BDC 95045-A1)

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

This guide uses the smallest ARK XH-A1 system in the cited manual: two ARK 2.5H-A1 battery modules and one BDC 95045-A1 controller. ARK, APX and different XH generations should not be treated as the same product.

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

What matters on your quote

The manual gives nominal energy and maximum/short-duration battery-system output. Its usable-energy figure elsewhere is per module; we do not relabel that as a quoted usable-system figure. The hybrid inverter adds a separate AC constraint.

• A single ARK module is not the minimum complete XH-A1 system shown here. Check the module count and BDC controller on your quote.
• The cited manual is from 2022. Confirm current UK availability, inverter compatibility and the full warranty for the exact supplied generation.
• The manual’s ten-year warranty line does not establish current UK throughput, end-of-life capacity or labour coverage. Ask for those conditions before comparing warranties.

At a glance

Not in the documents we checked so far: usable capacity, continuous / rated power (original units and basis), round-trip efficiency, 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.