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Principal Energy
Available now — stocked in VIC, NSW and QLD

Battery storage for commercial and industrial sites paying demand charges.

Each TIANWU unit stores 233 kWh and discharges at 50 or 100 kW. It AC-couples to existing solar and installs in under a day.

Request a quoteRequest a quoteMulti-site rolloutsMulti-site rollouts
Peak shaving — weekday demand
kW
Grid draw, no storage
With storage discharging
−38%
peak shaved, this profile
2.3 hrs
discharge at full rated power

By segment

Product catalogue →
01 · PRIORITY SEGMENT

Commercial & Industrial

Sites with demand charges, existing solar, and no outage cover.

Commercial & Industrial →↳ Multi-site rollouts
02

Data Centres

Edge, colocation and small-to-mid facilities. Backup duration, arbitrage, diesel displacement.

Data Centres →
03

Property Developers

Large-scale residential and mixed-use developments. Not a consumer channel.

Developer enquiries →

System functions

01
Peak shaving
Discharges across the half-hours that set the demand charge.
02
Maximum demand control
Holds the site under an agreed connection or tariff limit.
03
Backup operation
Carries the site through an outage for a stated duration.
04
Ancillary services
FCAS participation. Requires an aggregator and market registration.
Multi-AC coupling

Up to 12 units per cluster.

One unit is 233 kWh. Twelve in multi-AC coupling reach roughly 1.2 MW and 2.8 MWh, on the same install process and monitoring platform.

12
units per cluster
1.2 MW
peak power
2.8 MWh
stored energy
WHES battery storage cabinets
Why now

Incentives that change what a system costs

Eligibility is assessed under the rules in force at installation. Principal Energy does not provide tax or financial advice.

Full incentive detail →
Peak Demand Reduction SchemeOPEN NOW
NSW · from 1 September 2026 · BESS4 (20–200 kWh) / BESS5 (200 kWh–30 MWh)
20–40% off
SRES expansionOPENS SOON
Federal · from 1 October 2026 · Solar PV eligibility, not battery storage
100 kW → 1 MW

The equipment

Full catalogue →
TIANWU AIO
AC-coupled, retrofit to solar
AVAILABLE
TIANWU AIO
233 kWh
50/100 kW
86% RTE
Product detail →
POWERCORE
Hybrid, new solar + storage
AVAILABLE
PowerCore
100 kWh
50 kW
4 MPPTs
Product detail →
The manufacturer

Principal Energy supplies WHES systems. WHES manufactures them.

Weiheng Energy Storage was founded in 2017 and is rated Tier 1 by BloombergNEF. It holds an Australian regional headquarters. The warranty is issued by WHES; Principal Energy lodges and follows up claims.

About →
2017
Founded
Tier 1
BloombergNEF rated
3
R&D centres
3
Manufacturing centres
Stock and support

Warehouses in three states

VIC
Warehouse stock
NSW
Warehouse stock. Head office, Mittagong
QLD
Warehouse stock

Site assessment

Postcode and approximate peak demand are enough to size a system and return figures.

Request a quote