Hobart Net Zero in Massachusetts
Rebuild/DER on Martha's Vineyard
General Energy Use, Strategies and Systems
Energy Use:
4 minisplit air source heat pumps provide heat. Steibel Eltron heat DHW.
Energy Strategies:
The house is super insulated, with the building envelope extremely well sealed. The long axis of the house faces south and window area is maximized, with overhangs to take advantage of solar insolation. All appliances are Energy Star or use minimal energy for their type.
| Zero Net Energy Definition Used | Site Energy Use |
|---|
Monthly Energy Data and Utilities
Energy Data Type:
Modeled, Verified
Electric Utility:
NStar / Eversource
Gas Utility:
None
Other purchased Fuels:
No
Datasets and utility bills:
| Attachment | Size |
|---|---|
 PV generation and total house energy demand from installationin July 2014 until Jan 2016 | 46.92 KB |
| Energy model for house | 101.63 KB |
Datasets and utility bills sources and reliability:
Locus Energy LGate-101E monitoring system.
Cogeneration
Cogeneration System Description:
NA
Hobart Net Zero in Massachusetts
Renewables and Energy Balance
Renewable Energy Sources:
Renewable energy is generated within the building footprint (e.g. solar PV on the roof)
| Renewable Energy System Description & Details |
|---|
| 5.36 kW Grid Interactive PV system: 16 SunPower SPR-X21-335-BLK modules with Solar Edge SE6000A-US-U with P400 Optimizers Inverter. |
| Annual renewable energy generated | 7,741 kWh |
|---|---|
| Annual Renewable Energy Generated Data Type | Measured |
| Power Rating | Renewable Energy System Type(s) | Source of Annual Production Data |
|---|---|---|
| 5,360Watts | Photovoltaics | Power production is metered and measured; see attached pdf for generation/house consumption performance since installation. |
Storage and Installed Capacity
Will be wired to provide power for limited heat, ventilation, lighting and refrigeration until PV system can recharge the battery.
| Energy Storage type |
None yet. Ordered Tesla 10 kW storage battery, but has not yet been delivered. |
|---|---|
| Energy Storage Capacity |
Annual Energy Import/Export
| Electricity amount (imported from grid) | 10,642 kWh/year |
|---|---|
| Net electricity usage (purchased electricity) | 2,910 kWh/year |
| Electricity amount (credited or exported to grid) | 7,741 kWh/year |