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TEXAS OFF GRID - by HESOLAR

For over a decade the Hoffman Brothers have been installing advanced energy storage systems for the Central Texas Hill Country.

OFF GRID INSTALLATION

Off Grid Components

Learn more about Solar Panels, batteries, inverters, and other components that we use.
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System Sizes & Cost

Learn more about the off grid system sizes and a basic estimate on what they cost.
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The Hoffman Brothers

Learn More about the Hoffman Brothers and their background with Off Grid power systems.
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Off Grid Sizing and Cost

Micro Scale

Ex. Use Case: Tiny Home
$ 29,999
  • 1 x 12kPV Hybrid inverter
  • 14 kWh LFP battery
  • 7 kW Solar Array
    (Premium Mission MSX10 N-Type 108HC)
  • 33 Amps Continuous - 240V AC Power Output
  • Generator Ready
  • Installation by HESOLAR LLC
  • Roof Mount Aluminum Racking
  • Switch Gear and Wiring for Turn-key installation
  • Future Upgradability:

    • Solar up to 15 kW
    • Battery up to 42 kWh

Small Scale

Ex. Use Case: Small Cabin
$ 54,999
  • 1 x 18kPV Hybrid inverter
  • 28 kWh LFP battery
  • 14 kW Solar Array
    (Premium Mission MSX10 N-Type 108HC)
  • 50 Amps Continuous - 240V AC Power Output
  • Generator Ready
  • Installation by HESOLAR LLC
  • Roof Mount Aluminum Racking
  • Switch Gear and Wiring for Turn-key installation
  • Future Upgradability:

    • Solar up to 21 kW
    • Battery up to 42 kWh

Medium Scale

Ex. Use Case: 1500-3000 ft² House
$ 99,999
  • 2 x 21kPV Flex inverter
  • 56 kWh LFP battery
  • 30 kW Solar Array
    (Premium Mission MSX10 N-Type 108HC)
  • 24 to 32 kW - 240V AC Power Output
  • Generator Ready
  • Installation by HESOLAR LLC
  • Roof Mount Aluminum Racking
  • Switch Gear and Wiring for Turn-key installation
  • Load Control (4 x 240V circuits)
  • Future Upgradability:

    • Add additional 21kPV inverter
    • 36 to 48 kW - 240V AC Power (200A Service)
    • Solar up to 42 kW
    • Battery up to 84 kWh

Large Scale

Ex. Use Case: Ranch
$ 159,000
  • 6 x 21kPV Flex inverter
  • 84 kWh LFP battery
  • 48 kW Solar Array
    (Premium Mission MSX10 N-Type 108HC)
  • 2 x 36 to 48 kW - 240V AC Power (2 x 200A Service)
  • Generator Ready
  • Installation by HESOLAR LLC
  • Roof Mount Aluminum Racking
  • Switch Gear and Wiring for Turn-key installation
  • Load Control (8 x 240V circuits)
  • Future Upgradability:

    • Solar up to 126 kW
    • Battery up to 168 kWh

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OFF GRID INSTALLATION: System Components

The Hoffman Brothers meet with solar panel manufacturers multiple times per year to make sure HESOLAR is using the highest quality solar panels available. Typically they have 3 options of solar panels for off grid installations:

  • High Efficiency: Major manufacturers usually have a high efficiency line. These panels benefit from high quality builds, great warranties, and high performing temperature coefficients.
  • American Made: We make an effort to offer products made in the United States when possible.
  • Budget Solar Panels: Our suppliers always keep low budget panels in stock for projects that are less concerned about high efficiency.

Off Grid Inverters take DC voltage from Solar Panels and Batteries and invert them into usable 240V AC voltage. Technically these devices are known as Power Electronics. Below are examples of power electronics The Hoffman Brothers use in their off grid installations:

  • DC Coupled Inverters: DC Coupled systems couple the DC power from the solar panels and send it directly to the battery. The DC voltage from the solar panels and the battery can be directly inverted in to AC voltage from home loads. (Example of a DC coupled system by SIGenergy installed by HESOLAR)
  • AC Coupled Inverters: AC coupled systems have all solar panels and batteries inverted immediately to AC and then connected to the home loads. These systems often use micro-inverters and are more commonly found on off grid systems with grid power available.

 

This is a simplification of the Power Electronics utilized in off grid power systems. The Hoffman Brothers will specify inverters based on your specific project.

Off Grid Batteries have evolved from traditional Lead Acid to Lithium-ion (Li-ion) chemistries. Now the Li-ion chemistries are evolving from NMC to LFP. Below is a quick break down for the evolution of these products:

  • Lead-Acid: Traditional off grid systems utilized 48 volt lead acid batteries for backup power. These batteries were used before comparable Li-ion batteries were available for off grid power. They typically could only be discharged to 60% to avoid damaging the battery over time.
  • Li-ion NMC (Lithium Nickel Manganese Cobalt): These batteries have a high energy density and were the first Li-ion battery to really gain traction in the off grid battery market.
  • Li-ion LFP (Lithium Iron Phosphate): Sometimes referred to as LiFePO, LFP batteries are emerging as the favorite chemistry for off grid batteries. These batteries are typically less powerful than NMC but make up for it with safety and an expected longer life span.

Load Control products can be included in off grid designs by shutting off less important loads as the batteries charge level (State of Charge, SOC) goes down. Below are a couple of the options the Hoffman Brothers have deployed on their off grid systems:

  • Integrated Load Control: Some manufacturers include load control in their products. This image shows a SIGenergy system we installed that has space for 6 x 240v smart load controls.
  • 3rd party Load Control: Most of the manufacturers the Hoffman Brothers use work with 3rd party load control. The most common being SPAN where a 40 circuit panelboard can be used for load control.

Generator integration is essential in large off grid projects. Generators are used as a redundancy when solar power is limited due to clouds and storm systems. Generator integration notes:

  • We do NOT install and maintain generators. We provide the integration for 2-wire start and program our equipment to run the generator.
  • Portable Generators
  • More efficient use of fuel
  • The Hoffman Brothers are tenured Master Electricians that have installed generators over the years. However, generators require maintenance plans that generator contractor’s are best suited to provide. We can refer our customers to qualified generator contractors.