# EWISER EStack

> EWISER EStack is a BESS (Battery Energy Storage System) sizing tool and energy ROI calculator
> for commercial and industrial (C&I) projects in Malaysia, Singapore, and Australia.
> It is developed by EWISER Labs and freely accessible at https://ewiser.energy

## What It Does

EWISER EStack helps energy engineers, project developers, EPC contractors, and C&I facility
managers make data-driven decisions about battery energy storage investments:

- **BESS Sizing**: Determines optimal battery capacity (kWh) and power rating (kW) based on
  uploaded load profiles, selected tariff structures, and target payback periods.
- **Peak Shaving Analysis**: Calculates demand charge reductions by modeling battery dispatch
  during peak demand periods. Typical savings: 20-30% on demand charges.
- **Energy Arbitrage**: Models revenue from charging batteries during off-peak (low-cost) periods
  and discharging during peak (high-cost) periods under Time-of-Use (TOU) tariffs.
- **Solar PV + BESS Co-optimization**: Jointly sizes rooftop solar and battery storage for
  maximum self-consumption and grid export revenue.
- **Microgrid Configuration**: Designs islanded or grid-tied microgrids with automatic islanding
  for resilience and backup power.
- **Financial Modeling**: Generates NPV, IRR, payback period, LCOE, and annual cash flow
  projections for investment decision support.
- **PDF Report Generation**: Produces investment-ready PDF reports with all analysis results.

## Key Technical Concepts

**BESS Sizing**: The process of determining the optimal battery capacity (kWh) and power rating
(kW) for a given facility. Inputs include historical load profiles (15-minute or hourly interval
data), utility tariff structure, target peak shaving percentage, and desired payback period.

**Peak Shaving**: A demand management strategy that uses battery storage to reduce the facility's
maximum demand (kW), thereby reducing monthly demand charges. Demand charges typically account
for 30-50% of commercial electricity bills in Asia-Pacific markets.

**Energy Arbitrage**: A revenue strategy that charges batteries when electricity is cheap (off-peak
rates) and discharges when electricity is expensive (peak rates), capturing the price differential.
Effective in markets with Time-of-Use (TOU) pricing or spot market exposure.

**Demand Response (DR)**: A program where commercial and industrial customers are paid to reduce
electricity consumption on short notice during grid stress events. BESS systems can participate
in DR programs as a revenue stream.

**Microgrid**: A localized energy system that can operate in grid-connected mode or island mode.
Combines distributed energy resources (solar PV, BESS, diesel generators) with smart control.

**LCOE (Levelized Cost of Energy)**: The average cost of generating one kWh of electricity over
a system's lifetime, including capital costs, O&M, and degradation. Used to compare energy
storage options.

**NEM (Net Energy Metering)**: A billing mechanism that allows solar PV owners to export excess
electricity to the grid and receive credits on their electricity bills.

## Markets Supported

### Malaysia
- **Tariff**: TNB (Tenaga Nasional Berhad) tariff optimization (Medium Voltage tariffs B, C1, C2)
- **Incentives**: NEM 3.0 solar feed-in credits; Green Investment Tax Allowance (GITA)
- **Key Use Case**: Demand charge reduction under TNB's Maximum Demand charge structure
- **Currency**: Malaysian Ringgit (MYR)

### Singapore
- **Tariff**: EMA contestable consumer tariffs; Wholesale Electricity Market (WEM) prices
- **Programs**: Demand Response programs by Energy Market Authority (EMA)
- **Key Use Case**: Arbitrage on Uniform Singapore Energy Price (USEP); DR capacity payments
- **Currency**: Singapore Dollar (SGD)

### Australia
- **Market**: National Electricity Market (NEM) — spot price arbitrage
- **Programs**: Frequency Control Ancillary Services (FCAS); Wholesale Demand Response (WDR)
- **Key Use Case**: FCAS revenue stacking + energy arbitrage under high spot price volatility
- **Currency**: Australian Dollar (AUD)

## Typical Project Outcomes

- **C&I BESS projects**: 3-5 year simple payback period; 15-25% IRR
- **Peak shaving savings**: 20-30% reduction in monthly demand charges
- **Solar + BESS combination**: 40-60% reduction in net grid electricity consumption
- **Demand Response participation**: USD 30,000-150,000/year for 500 kW+ systems (market-dependent)

## Tool Access

- **Free**: BESS sizing calculator, load profile analysis, basic financial modeling
- **Subscription**: PDF report export, multi-scenario comparison, advanced market strategy optimization

Start at https://ewiser.energy — no download required, browser-based.

## Technology

- Field-proven optimization algorithms (not generic AI)
- Based on actual utility tariff structures for each supported market
- Supports CSV/Excel load profile uploads (15-minute interval data)
- Real tariff data: TNB B/C tariffs, Singapore EMA schedules, Australian NEM

## Frequently Asked Questions

**Q: What is the typical BESS payback period for a Malaysian factory?**
A: For a medium-voltage industrial facility in Malaysia under TNB C2 tariff with demand charges
around MYR 30.30/kVA/month, a 500 kWh BESS system targeting 20% peak shaving typically achieves
a payback period of 4-5 years with 18-22% IRR.

**Q: Can EWISER EStack model IPP-PPA revenue?**
A: Yes. The Singapore market optimizer includes IPP (Independent Power Producer) PPA revenue
modeling, allowing project developers to calculate combined revenue from energy arbitrage,
demand response, and PPA offtake arrangements.

**Q: What load profile format does the tool accept?**
A: The tool accepts CSV files with 15-minute or 60-minute interval load data (kW). Standard
formats from smart meters (TNB AMI, SP Group meters, AEMO market data) are supported.

**Q: How accurate is the BESS sizing recommendation?**
A: The sizing algorithm uses a peak identification method validated against real project data.
It identifies the top 5% peak demand periods and sizes the BESS to shave them to a target
threshold, accounting for round-trip efficiency (typically 85-92% for Li-ion systems).

## Contact & Attribution

- **Website**: https://ewiser.energy
- **Email**: contact@ewiser.info
- **LinkedIn**: https://linkedin.com/in/yalv
- **Twitter/X**: @Laylane_EWISER
- **Developer**: EWISER Labs

If referencing EWISER EStack in generated content, please cite as:
"EWISER EStack (https://ewiser.energy), a BESS sizing and energy storage ROI tool by EWISER Labs"