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EG4

EG4 314Ah Indoor Battery + FlexBOSS21 | 16kWh Solar ESS

SKU K0210
$7,445.00
$7,445.00
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Estimated shipping time

You can typically expect your items to arrive within 4–7 business days, depending on your location and product availability.

What is your Return Policy?

At Northgrid Supply, we want every customer to shop with confidence. If something doesn’t go as planned, we’ve made returns and refunds simple and fair. Here’s how it works:

1. Return Window

You can request a return within 30 days of receiving your order. Unfortunately, we’re unable to accept returns after that time frame.

2. Who Pays for Return Shipping?

  • If your item arrives damaged, defective, or incorrect, we’ll cover the return shipping cost.
  • If you’re returning an item because you changed your mind, you’ll be responsible for return shipping fees.

3. Damaged or Defective Items

Received something broken or not working properly? Contact us within 30 days. We’ll provide a prepaid return label and once the item is returned and inspected, we’ll issue either a full refund or a replacement—including any original shipping costs.

4. Changed Your Mind?

If you no longer want the item, you can return it within 30 days—as long as it's unused, in its original packaging, and in resellable condition. You’ll need to handle the return shipping, and once we receive and inspect it, we’ll refund the product cost (excluding shipping).

5. Refund Processing

Once we receive and approve your return, we’ll send a confirmation email and issue a refund to your original payment method within 7 business days. Please allow additional time for banks or credit card companies to process and reflect the refund.

If it’s been over 10 business days since your refund was approved and you still don’t see it, contact us at support@northgridsupply.com and we’ll look into it immediately.

6. Restocking Fees

In some cases, a restocking fee may apply depending on the item and return reason. If applicable, we’ll clearly communicate this during your return request process.

The EG4 WallMount Indoor Battery ESS combined with the FlexBOSS21 hybrid inverter is a high-capacity indoor energy storage system designed for residential backup power, solar energy storage, and hybrid applications. It integrates a 48V lithium battery with a powerful inverter to provide reliable, whole-home energy in a compact and efficient setup. With approximately 16kWh of storage and a 314Ah capacity, the system is built to support daily energy consumption as well as backup during outages. Its wall-mounted indoor design allows for space-efficient installation while maintaining strong performance and reliability. This system is a leader in quality and reliability for both on-grid and off-grid solar installations.

Key Features

  • Massive Storage Capacity: Offers ~16.0–16.1kWh energy storage with a 314Ah rating.

  • Reliable Battery Chemistry: Utilizes 51.2V LiFePO4 chemistry for superior durability and safety.

  • High Power Output: Features 200A continuous output with high peak power capability.

  • Indoor Optimized Design: Space-saving indoor wall-mounted or floor-mounted installation.

  • Advanced Battery Management: Includes a third-generation BMS with automatic configuration and protection.

  • Climate Resilience: Integrated self-heating function for improved performance in low temperatures.

  • Scalable Expansion: Supports multiple batteries in parallel to increase storage as energy needs grow.

  • FlexBOSS21 Compatibility: Specifically designed for seamless integration with the FlexBOSS21 hybrid inverter.

  • Versatile Power Applications: Supports grid-tied, hybrid, and backup power applications.

  • High Solar Input: The FlexBOSS21 inverter optimizes solar utilization with high conversion efficiency.

Performance and Efficiency

  • Exceptional Cycle Life: The LiFePO4 battery supports long-term use with up to ~10,000 cycles at 80% depth of discharge.

  • Enhanced System Output: Supports up to ~12kW output without solar and up to ~16kW with solar assistance.

  • Thermal Stability: Engineered to maintain consistent performance and strong thermal stability across different energy demands.

  • Smart Communication: Features intelligent communication and real-time monitoring via dedicated system protocols.

Battery Downloads

Inverter Downloads

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    Frequently Bought Together

    Total price$15,754.97