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The PowerTower™ : a stand-alone
pre-integrated solar-wind power system
Alex De Broe, CEO XANT
Steve Drouilhet, CEO Sustainable Power Systems
WIND POWER
MADE EASY
• Mid sized wind turbines
✓ 50 - 500 kW
• Applications
✓ On-site generation
✓ Off-grid systems
✓ Drivers
✓ Fuel- & battery saver
✓ Hedge against volatile
energy prices
✓ Smart-grid enabler
✓ Land mark
3
DESIGN FOR RELIABILITY
3
• Just Enough Essential Parts
JEEP
• Elimination of most-failure-
prone parts
XANT DEPLOYMENTS
4
DESIGN FOR RELIABILITY
4
• Just Enough Essential Parts
JEEP
• Elimination of most-failure-
prone parts
Challenges rural electrification world-wide
- Catch-22 situation resolved: money is available, technology is ready, need is (still) there
(fraction of the rural population without access to electricity still stands at 28%)
- But what is the best replicable business model?
Source: TFE consulting
55
GRID-
FORMING
INVERTER
Standard System Architecture
- DC-AC conversion for generation
- DC-AC conversion for battery
- Isolation transformers
6
DESIGN FOR RELIABILITY
6
GRID-
FORMING
INVERTER
System Architecture
- XANT S-24 turbine (50kWe)
- PV array 50kWp
- 100…500kWh battery
77
Advantages of a DC-bus architecture
- Reduced capital cost
- Eliminates 2 transformers
- Eliminates 2 DC-AC converters
- Reduces system complexity
- Increases reliability
- Increases system efficiency
- Fewer conversion steps
- Reduced losses during low wind o low irradiance periods
8
DESIGN FOR RELIABILITY
8
• Just Enough Essential Parts
JEEP
• Elimination of most-failure-
prone parts
The PowerTower: system sizing (HOMER Pro)
Assumptions
Turn-key CAPEX
- Li-Ion batteries (including BMS): 400$/kWh
- PV panels + DC-DC conversion stage: 1,000$/kW
- XANT S (w/o grid-side converter w/o tower): 175,000$
- Grid-side converter: 50,000$
Fixed CAPEX
- Logistics: 35,000$
- Civil & Electrical Works: 50,000$
- Distribution System: 150,000$
- Monitoring: 15,000$
- Engineering: 50,000$ (only in case of customized system)
Resources
- Solar GHI: 3.0…6.0 kWh/m² per day
- Wind: Avg. wind speed 4.5…8.5 m/s
9
DESIGN FOR RELIABILITY
9
The PowerTower: system sizing (HOMER Pro) (300kWh/day)
CUSTOMIZED SYSTEM STANDARDIZED SYSTEM
10
DESIGN FOR RELIABILITY
10
• Just Enough Essential Parts
JEEP
• Elimination of most-failure-
prone parts
Conclusions
- Assuming a minimal cost advantage of a standardized system over a customized system the
STANDARDIZED system achieves a lower LCOE than the CUSTOMIZED system
- Over a wider range the STANDARDIZED system still achieves similar LCOE’s than the CUSTOMIZED system
- Tailoring can easily be done by adjusting the battery size
- Standardization not on leads to cost reduction but also to simplification and thus more robust systems,
faster deployment and more effective maintenance (lower OPEX)
- Solutions to minimize the effects of local conditions: e.g. gravity-based foundation to avoid soil studies
Steve Drouilhet, CEO
Sustainable Power Systems
Alex DeBroe, CEO
XANT
Power Tower Application:
Innovative Water Pumping Solution for
Commercial Irrigation and Municipal Water Supply
Universal Microgrid ControllerTM
(Power & Energy Management System)

Monitors and coordinates the operation of all
system components

Touchscreen local operator interface

On-board datalogging

Internet ready

A pre-engineered solution designed to
minimize the time and expense of microgrid
controls integration
SPS Deployments
Water Supply Challenges in Africa

Over 300 million people in Sub-Saharan
Africa lack access to reliable drinking
water sources

Many rely on surface water sources,
many of which are polluted:

Mining runoff

Agricultural fertilizer and pesticides

Poor sanitation

Deforestation and soil erosion

Disease Prevention and Economic
Development require access to clean
ground water supplies

“Energy-Water Nexus”: Accessing
ground water requires pumping, which
requires energy.
Water Pumping is a Perfect Application for
Renewable Energy

Storage allows decoupling the
supply from the demand.

Pumped water is an energy
storage medium

Water storage is less expensive
than equivalent battery capacity

Lasts much longer

Local materials with local labor

Pump according to how much
renewable energy is available
Hawaii Wind Powered Water Pumping System

Commissioned by SPS in 2013

Irrigation of an off-grid
commercial plant nursery

Replaces diesel water pumping

Conventional 100 kW grid-tied
wind turbine

Grid-forming battery-inverter
system

200 meter well depth

70,000 gallon water tank

~ 200 gpm (46 m3/h) in 8 m/s
wind
Wind Water Pumping System - AC Bus Architecture
Wind Water Pumping System - DC Bus Architecture
Power Tower
Wind/PV Water Pumping System - DC Bus
Summary

Water pumping is an ideal application for renewable energy.

SPS and XANT have developed a packaged wind-powered
water pumping solution specifically for off-grid municipal and
commercial applications

The power system's innovative DC-coupled architecture
provides low cost and complexity and high efficiency and
reliability.

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XANT SPS PowerTower WindWell homer microgrid 2017

  • 1. The PowerTower™ : a stand-alone pre-integrated solar-wind power system Alex De Broe, CEO XANT Steve Drouilhet, CEO Sustainable Power Systems
  • 2. WIND POWER MADE EASY • Mid sized wind turbines ✓ 50 - 500 kW • Applications ✓ On-site generation ✓ Off-grid systems ✓ Drivers ✓ Fuel- & battery saver ✓ Hedge against volatile energy prices ✓ Smart-grid enabler ✓ Land mark
  • 3. 3 DESIGN FOR RELIABILITY 3 • Just Enough Essential Parts JEEP • Elimination of most-failure- prone parts XANT DEPLOYMENTS
  • 4. 4 DESIGN FOR RELIABILITY 4 • Just Enough Essential Parts JEEP • Elimination of most-failure- prone parts Challenges rural electrification world-wide - Catch-22 situation resolved: money is available, technology is ready, need is (still) there (fraction of the rural population without access to electricity still stands at 28%) - But what is the best replicable business model? Source: TFE consulting
  • 5. 55 GRID- FORMING INVERTER Standard System Architecture - DC-AC conversion for generation - DC-AC conversion for battery - Isolation transformers
  • 6. 6 DESIGN FOR RELIABILITY 6 GRID- FORMING INVERTER System Architecture - XANT S-24 turbine (50kWe) - PV array 50kWp - 100…500kWh battery
  • 7. 77 Advantages of a DC-bus architecture - Reduced capital cost - Eliminates 2 transformers - Eliminates 2 DC-AC converters - Reduces system complexity - Increases reliability - Increases system efficiency - Fewer conversion steps - Reduced losses during low wind o low irradiance periods
  • 8. 8 DESIGN FOR RELIABILITY 8 • Just Enough Essential Parts JEEP • Elimination of most-failure- prone parts The PowerTower: system sizing (HOMER Pro) Assumptions Turn-key CAPEX - Li-Ion batteries (including BMS): 400$/kWh - PV panels + DC-DC conversion stage: 1,000$/kW - XANT S (w/o grid-side converter w/o tower): 175,000$ - Grid-side converter: 50,000$ Fixed CAPEX - Logistics: 35,000$ - Civil & Electrical Works: 50,000$ - Distribution System: 150,000$ - Monitoring: 15,000$ - Engineering: 50,000$ (only in case of customized system) Resources - Solar GHI: 3.0…6.0 kWh/m² per day - Wind: Avg. wind speed 4.5…8.5 m/s
  • 9. 9 DESIGN FOR RELIABILITY 9 The PowerTower: system sizing (HOMER Pro) (300kWh/day) CUSTOMIZED SYSTEM STANDARDIZED SYSTEM
  • 10. 10 DESIGN FOR RELIABILITY 10 • Just Enough Essential Parts JEEP • Elimination of most-failure- prone parts Conclusions - Assuming a minimal cost advantage of a standardized system over a customized system the STANDARDIZED system achieves a lower LCOE than the CUSTOMIZED system - Over a wider range the STANDARDIZED system still achieves similar LCOE’s than the CUSTOMIZED system - Tailoring can easily be done by adjusting the battery size - Standardization not on leads to cost reduction but also to simplification and thus more robust systems, faster deployment and more effective maintenance (lower OPEX) - Solutions to minimize the effects of local conditions: e.g. gravity-based foundation to avoid soil studies
  • 11. Steve Drouilhet, CEO Sustainable Power Systems Alex DeBroe, CEO XANT Power Tower Application: Innovative Water Pumping Solution for Commercial Irrigation and Municipal Water Supply
  • 12. Universal Microgrid ControllerTM (Power & Energy Management System)  Monitors and coordinates the operation of all system components  Touchscreen local operator interface  On-board datalogging  Internet ready  A pre-engineered solution designed to minimize the time and expense of microgrid controls integration
  • 14. Water Supply Challenges in Africa  Over 300 million people in Sub-Saharan Africa lack access to reliable drinking water sources  Many rely on surface water sources, many of which are polluted:  Mining runoff  Agricultural fertilizer and pesticides  Poor sanitation  Deforestation and soil erosion  Disease Prevention and Economic Development require access to clean ground water supplies  “Energy-Water Nexus”: Accessing ground water requires pumping, which requires energy.
  • 15. Water Pumping is a Perfect Application for Renewable Energy  Storage allows decoupling the supply from the demand.  Pumped water is an energy storage medium  Water storage is less expensive than equivalent battery capacity  Lasts much longer  Local materials with local labor  Pump according to how much renewable energy is available
  • 16. Hawaii Wind Powered Water Pumping System  Commissioned by SPS in 2013  Irrigation of an off-grid commercial plant nursery  Replaces diesel water pumping  Conventional 100 kW grid-tied wind turbine  Grid-forming battery-inverter system  200 meter well depth  70,000 gallon water tank  ~ 200 gpm (46 m3/h) in 8 m/s wind
  • 17. Wind Water Pumping System - AC Bus Architecture
  • 18. Wind Water Pumping System - DC Bus Architecture
  • 19. Power Tower Wind/PV Water Pumping System - DC Bus
  • 20. Summary  Water pumping is an ideal application for renewable energy.  SPS and XANT have developed a packaged wind-powered water pumping solution specifically for off-grid municipal and commercial applications  The power system's innovative DC-coupled architecture provides low cost and complexity and high efficiency and reliability.