IEEE Electrification Magazine - June 2017 - 41

Height × width × depth

Relaxed Open Circuit Voltage (V)

Table 2. Characteristics of the aspen 48S-2.2
battery installed at the Keating nanogrid.
935 mm × 330 mm
× 310 mm

Weight

118 kg

Nominal energy (10-h charge/
20-h discharge)

2.2 kWh

Nominal voltage

48 V dc

Cycle life

3,000 cycles (to 70%
retained energy)

Ambient operating
temperature

−5 °C to 40 °C

Voltage range

40.0-59.5 V dc

Peak power

1.0 kW

Continuous current

20 A

Usable depth of discharge

100%

58
56
54
52
50
48
46
100

80

60
40
SOC (%)
(a)

20

0

5-min Power (W)

1,200

As part of the Keating Nanogrid installation, four LED streetlight fixtures manufactured by Aris Wind were also installed
for improving the lighting condition outside the Keating
Nanogrid. Each stand-alone streetlight (i.e., no grid connection is required) consists of a 230-Ah battery, a 300-W wind
turbine, and an 80-W LED light, as shown in Figure 12. A
concrete base enables the 30-ft-high light pole to withstand extreme weather conditions. The wind turbine is
equipped with a duct-augmented system to conduct the
turbine airflow into the blades at a lower wind speed.

800

Charge
Discharge

600
400
200
0

estimated to offer 75% energy savings (excluding daylight savings) to 90% energy savings (considering daylight savings).

Islandable LED Streetlights

1,000

0

20

40
60
SOC (%)
(b)

80

100

Figure 8. The open-circuit voltage and power output of Aspen 48S-2.2
battery. (a) Voltage versus SOC. (b) Power versus SOC.

Accordingly, the wind turbine power is less susceptible to
wind-speed variability, leading to a more consistent
charging of the onboard battery. The integrated windsolar-storage system sustains the outside lighting by utilizing renewable energy more efficiently and is regarded
as a perfect solution for enhancing the resilience in regions
where the electricity grid is subject to severe outages and for
supplying electricity to remote nanogrids without any grid

(a)

(b)

Figure 9. Aquion Energy's battery installation at the Keating Nanogrid. (a) M-line battery module. (b) Commissioning.
	

IEEE Electrific ation Magazine / j une 2 0 1 7

41



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