Off-Grid with Lithium-ion Batteries

off grid lithium ion system

Objective:

The customer was building a new home and would have had a large cost of connection to the electricity grid. They wanted a system that would be hassle-free and comfortably meet their needs, and to use the latest technology.

Site Considerations:

The shed was the idea place for the system to be installed, with the batteries stacked on top of each other to safe on space. Being in a cold climate area, allowances needed to be made for low solar input in winter.

System Design: 

  • SMA Sunny Island 8.0 Inverter Charger
  • BMZ ESS7.0 lithium-ion battery unit (20kWh)
  • 32 x Tindo Solar 260W solar modules
  • 2 x SMA Sunny Boy 4000TL
  • Tilted roof-mount array framing

Tesla Powerwall with Existing Solar

tesla powerwall

Objective:

The customer wanted a battery storage system to use more of his solar, and buy less power from the grid. He liked the idea of having some backup ability as well, but this wasn’t a necessity.

Site Considerations:

System needed to retrofit to his existing SMA solar array, and be installed outside along a protected service wall.

System Design: 

  • SMA Sunny Boy Storage 2.5
  • 7kWh Tesla Powerwall
  • SMA Sunny Portal monitoring
  • Existing 7kW solar array

Off-Grid Lithium-ion System Upgrade

Lithium-ion System Upgrade

Objective:

Customers existing standalone power system was insufficient for their needs and was failing. Required larger capacity, the latest technology and integrate old solar

Load Analysis:

5.2-4.2kWh average daily winter/summer demand; 5.8kW design surge

Site Considerations:

Flat roof requires optimal tilt frames to improve winter solar ouput; clear old system

System Design:

  • OEA Complete 60-48 System – 6kW 1-phase output
  • OEA Adapt mount – install on customer veranda
  • 5kWh L-ion battery storage with BMS
  • 6kW Monocrystalline solar array on optimal tilt frames
  • Integrate old solar array via dc-shunt and PL40 controller