Transcript T05 Presentation

1
Stand-alone PV system for
residential charging station
for an Electric Vehicle
Aaditya Vaishampayan
Ninad Sonje
(PV engineers, Second Solar, Inc.)
2
Problem Statement
 To design a stand-alone PV system for residential charging of an
Electric Vehicle.
 The system must be independent of the existing residential electrical
systems as well as the grid.
 Must be able to provide enough charge required for daily
commute.
3
Design Considerations
 The residential charging system is located in the Phoenix area.
 The PV system is a fixed tilt type system with tilt equal to
latitude.
 The Electric vehicle used to design is a Chevrolet Bolt.
 Battery rating: 60 kWh, Range: 238 miles on full charge.
 Two days of autonomy for the charging station.
 Assuming a maximum of 100 miles commute daily.
 Micro-inverters used in place of string inverters.
 Battery Bank required to provide energy when PV system is
not generating power.
4
PV module :
Panasonic (N310k HIT module)
 Total system size: 11.1 kW
 Rated power of module: 310 W
 Heterojunction Technology module
 Total no of modules required: 37
5
Charge Controller: Outback (GS 4048A)
 Takes both AC and DC inputs.
 Output voltage can be set from
110 -240V and 50-60 Hz.
 Works with 48 V battery banks.
 Has grid integration capabilities.
6
Inverter: ABB Microinverter MICRO-0.3HV- I
 Has its own MPPT controller.
 Can take maximum of 360 W.
 Has its own data link for
monitoring performance.
 Has in-built ground fault
detection.
7
Crown Renewable Power (mono-block
series 27)
 Sealed Lead Acid batteries
designed for deep discharge
cycles.
 12 V , 115 Ah capacity.
 Can handle 1800 cycles at
50% depth of discharge.
 Uses glass mesh layers for
efficient recovery of lead
oxide during charging.
 Maintenance free, comes
with a stacking enclosure.
8
Block diagram of the system
Charging port
Charge
controllers
Battery Bank
PV ARRAY with
microinverter
9
Economics
Component
description
Manufacturer
Quantity
Cost
PV module
Panasonic (N310K
HIT module)
37
$15540
Inverter
ABB MICRO0.3HV- I
37
$10175
Charge Controller
Outback (GS
4048A)
3
$6300
Battery
Crown Renewable
Power (monoblock series 27)
16
$9200
Total
$41,215
10
Conclusion
 Total system cost is very high (around $50 k).
 Saving are also very low (around $4500).
 Return on investment more than 12 years, thus not feasible.
 Battery technology is evolving rapidly, so system may become
feasible in future.
Thank you!
11