Walden Pond Visitor Center
General Energy Use, Strategies and Systems
Energy Use:
The project contains the following systems and strategies related to building energy use:
- Super-insulated building envelope
- LED lighting with occupancy and daylight sensors
- Building Management System for control of lighting and HVAC systems
- Rooftop solar hot water system
- On-site PV parking canopy
- EV charging stations
Energy Strategies:
The guiding energy strategy for the building was to start from a lowest level of energy use possible. Through the systems and strategies listed above the project achieved a low baseline energy use level before employing the on-site PV system to offset the remaining building energy use.
Zero Net Energy Definition Used
Site Energy Use
Monthly Energy Data and Utilities
Energy Data Type: Modeled, Verified
Electric Utility: Concord Municipal Light Plant
Gas Utility: N/A
Other purchased Fuels: None
Datasets and utility bills:
Attachment Size 
Electric bills representing approx one year of building energy usage747.68 KB PV generation data for same time frame as electric bills 101.1 KB
Datasets and utility bills sources and reliability: Generation data is taken from PV array metering as captured continuously on PV array website. Usage numbers are provided from utility bills (Concord Electric) as logged by building meter.
Cogeneration
Cogeneration System Description:
N/A
Walden Pond Visitor Center
Renewables and Energy Balance
Renewable Energy Sources: Renewable energy is generated on-site but not on the building (e.g. wind turbine in the parking lot)
Renewable Energy System Description & Details
Within the main parking area of the park is a RBI Parking Canopy Array with 336 qty Upsolar 315W modules - each w/ module-level DC optimizers, feeding 8 qty Solaredge SE11400A-US inverters. These are arranged on two equal-sized carport structures, single 5 degree tilt each. Azimuths 6 deg & 27 deg East of True South.
Annual renewable energy generated
103,224 kWh
Annual Renewable Energy Generated Data Type
Measured
Power Rating
Renewable Energy System Type(s)
Source of Annual Production Data
105,840Watts
Photovoltaics
PV production numbers were measured from array meter data October 01, 2016 through September 30, 2017 and represents PV array gross production.
Storage and Installed Capacity
Energy Storage type
N/A
Energy Storage Capacity
Annual Energy Import/Export
Electricity amount (imported from grid)
37,100 kWh/year
Electricity amount (credited or exported to grid)
68,448 kWh/year
General Energy Use, Strategies and Systems
Energy Use:
The project contains the following systems and strategies related to building energy use:
- Super-insulated building envelope
- LED lighting with occupancy and daylight sensors
- Building Management System for control of lighting and HVAC systems
- Rooftop solar hot water system
- On-site PV parking canopy
- EV charging stations
Energy Strategies:
The guiding energy strategy for the building was to start from a lowest level of energy use possible. Through the systems and strategies listed above the project achieved a low baseline energy use level before employing the on-site PV system to offset the remaining building energy use.
| Zero Net Energy Definition Used | Site Energy Use |
|---|
Monthly Energy Data and Utilities
None
| Attachment | Size |
|---|---|
| Electric bills representing approx one year of building energy usage | 747.68 KB |
| PV generation data for same time frame as electric bills | 101.1 KB |
Generation data is taken from PV array metering as captured continuously on PV array website. Usage numbers are provided from utility bills (Concord Electric) as logged by building meter.
Cogeneration
Cogeneration System Description:
N/A
Walden Pond Visitor Center
Renewables and Energy Balance
| Renewable Energy System Description & Details |
|---|
| Within the main parking area of the park is a RBI Parking Canopy Array with 336 qty Upsolar 315W modules - each w/ module-level DC optimizers, feeding 8 qty Solaredge SE11400A-US inverters. These are arranged on two equal-sized carport structures, single 5 degree tilt each. Azimuths 6 deg & 27 deg East of True South. |
| Annual renewable energy generated | 103,224 kWh |
|---|---|
| Annual Renewable Energy Generated Data Type | Measured |
| Power Rating | Renewable Energy System Type(s) | Source of Annual Production Data |
|---|---|---|
| 105,840Watts | Photovoltaics | PV production numbers were measured from array meter data October 01, 2016 through September 30, 2017 and represents PV array gross production. |
Storage and Installed Capacity
| Energy Storage type |
N/A |
|---|---|
| Energy Storage Capacity |
Annual Energy Import/Export
| Electricity amount (imported from grid) | 37,100 kWh/year |
|---|---|
| Electricity amount (credited or exported to grid) | 68,448 kWh/year |