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iStore

iStore
Smart String Battery S1

iStore’s 6.9 kWh module range with three listed tower sizes.

Research-based opinionAustralian product range confirmedChecked 13 November 2026
iStore Smart String Battery S1 product visual6.9–20.7 kWh
01

Manufacturer-sourced facts

What it is.

These are product facts, not a score or endorsement.

Request an installed quote for the exact inverter, battery stack and backup hardware.

Usable capacity range
6.9–20.7 kWh
Published output
3.5, 7 or 10.5 kW battery-side DC per tower, before inverter limits
Module size
6.9 kWh
Architecture
DC-coupled
Phase support
Single-phase and Three-phase
Backup
Optional backup
Warranty
15 years with separate throughput and retention terms
Cell chemistry
LFP
CEC status checked
Three S1 towers are listed through 31 December 2027.
Standout specification
6.9–20.7 kWh usable per tower, with inverter-specific parallel limits
Show 3 model variants

These model names sit inside the family above. Capacity, phase and output still need to match the installed configuration.

  • IS-BATT-7000-S1
  • IS-BATT-14000-S1
  • IS-BATT-21000-S1
02

Our opinion

The buying view.

EDITORIAL OPINION - BASED ON THE CITED RESEARCH
“The two original 5 and 6 kW single-phase inverters support one S1 tower. The larger three-phase hybrids can support four towers with the specified DTSU666-HW meter. Confirm stock and installed pricing with the supplier.”
Best suited to
Checking an iStore S1 battery and inverter quote by exact model
What stands out
6.9–20.7 kWh usable per tower, with inverter-specific parallel limits
03

Cons and watch-outs

What to check before buying.

These are configuration trade-offs and questions to verify, not claims that the product is defective.

  • The current S1 declaration omits IS-HYB-8000-1PH. Ask for written confirmation if it appears on a quote.
  • S1 uses the IS-BATT-7000-BMS controller and its matching modules.

Ask for these points to be answered against the exact model numbers and installed configuration in your quote.

04

Evidence trail

Check the sources.

Specifications can change by model revision, region and paired hardware. CEC approval is not proof of current availability or suitability. Confirm the model and final design with the manufacturer and an accredited Australian installer.

iStore - Australian S1 battery datasheetOpen manufacturer source ↗iStore - September 2026 S1 compatibility statementOpen supporting source ↗iStore - Australian warrantyOpen supporting source ↗CEC series: IS-BATTSearch the household-scale approval register →Is something outdated or incorrect?Contact TechManPat with an update →

Evidence check

Last checked

Australian sources
Specifications last checked
13 November 2026
Price last checked
No separate price check recorded
Australian availability last checked
13 November 2026

What changed

No material change logged.

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