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Big Battery

BigBattery EG4-WallMount Indoor Battery | 48V 314Ah | 16kWh | UL9540A | Self-Heating

SKU FEWMT-48161-G1
$3,727.99
$3,727.99
Free Shipping Contiguous USA
Warranty Info View coverage → 30-Day Returns View terms →
Questions? Give us a call +1 239-310-4096
In stock

Estimated Delivery: 4-7 Business Days from Order Date

Free Standard Shipping on All Orders to the Contiguous USA

30 Day Return Policy with 25% restocking fee applies to change-of-mind returns. See full policy

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 Wildhaven Curator, 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@wildhavencurator.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.

Big Battery

BigBattery EG4-WallMount Indoor Battery | 48V 314Ah | 16kWh | UL9540A | Self-Heating

SKU FEWMT-48161-G1
$3,727.99
BigBattery EG4-WallMount Indoor Battery | 48V 314Ah | 16kWh | UL9540A | Self-Heating
Warranty & Support Big Battery

At Wildhaven Curator, we’re here to help with warranty questions about your BigBattery purchase. Our team can help identify the applicable coverage and coordinate manufacturer support.

Manufacturer Warranty Overview

Coverage depends on the product, purchase date, and applicable manufacturer terms. BigBattery provides lifetime technical support and automatically records battery warranties through serial numbers and QR codes.

Coverage and Duration

• BigBattery Batteries: Purchases after October 2024 carry 12-year repair/replacement coverage for material and workmanship defects.

• Earlier Battery Purchases: Purchases before October 2021 carry three-year coverage; purchases from October 2021 through October 2024 carry ten-year coverage.

• BigBattery Chargers and Accessories: One-year coverage from purchase for qualifying defects under normal use.

• BigBattery APEX-6.5K and APEX-10K Inverters: Five-year limited warranty. Contact us for model-specific eligibility, exclusions, and service arrangements.

• Other Manufacturers: Products branded EG4, Sol-Ark, Victron, Growatt, AIMS, or another manufacturer follow that manufacturer’s warranty.

Battery Warranty Service

BigBattery assesses returned batteries before approving service. Repairs or refurbished replacements may be provided.

If a new replacement is provided, beginning in year two, the customer may owe one-twelfth of its cost per year of ownership.

Capacity-loss claims below 25% are excluded. Manufacturer capacity testing is free; results determine eligibility.

Conditions and Exclusions

Battery exclusions include misuse, improper installation, environmental damage, improper charging, over-discharge, and unauthorized modification/disassembly.

If charge falls below 10%, recharge within 48 hours. Contact BigBattery immediately if charging is impossible.

Charger coverage excludes misuse, physical damage, unauthorized work, incompatible equipment, and operation outside specifications. IP65 charger coverage is nontransferable; repaired/replacement chargers retain the original warranty dates.

Battery Warranty Transfers

• Stationary batteries must remain at the original location; ownership-transfer documentation must be emailed within 30 days.

• Mobile batteries must remain in the original vehicle/system, with original purchase proof and a documented ownership chain.

How to Submit a Warranty Inquiry or Claim

  1. Email support@wildhavencurator.com with your order number and proof of purchase.
  2. Include the product model, serial number, issue description, and available photographs.
  3. Our team can help coordinate troubleshooting with BigBattery.
  4. Obtain return instructions before shipping and follow the required packaging procedure.

Manufacturer support: Support@BigBattery.com
Manufacturer phone: (818) 280-3091

Shipping, Labor, and Related Costs

• Battery claims: Eligible first-year claims receive round-trip shipping within the continental U.S.; customers pay both directions afterward. Disconnection, service interruption, and repacking are excluded. International customers pay shipping.

• IP65 charger claims: Customers prepay shipment to the manufacturer. Confirm other shipping costs before returning.

• APEX claims: Contact us to confirm freight, labor, and service costs before arranging work.

Warranty Assistance

For help understanding coverage or coordinating support, contact Wildhaven Curator:

Email: support@wildhavencurator.com
Phone: +1 239-310-4096

Need help with this product? support@wildhavencurator.com
+1 239-310-4096

This indoor lithium iron phosphate battery provides 16kWh of nominal storage and 314Ah capacity for residential, commercial, off-grid, and backup applications. It supports 200A continuous discharge and 12.8kW peak power for 3 seconds.

Automatic self-heating supports operation in cold environments. An integrated battery management system provides active balancing and protection, while monitoring controls help track battery performance.

Wall or floor mounting accommodates different installation layouts. Auto-ID technology simplifies battery recognition during expansion, with support for up to 16 parallel units.

Key Features

  • Self-Heating: Supports battery operation in cold environments.

  • Battery Management: Integrated BMS with active balancing.

  • Emergency Stop: Provides rapid shutdown.

  • Monitoring: LCD touchscreen and LED status indicators.

  • Expansion: Auto-ID simplifies recognition of additional batteries.

  • Indoor Installation: IP20 enclosure with wall or floor mounting.

Specifications

  • Battery Type: Lithium Iron Phosphate (LFP)

  • Nominal Energy Capacity: 16kWh

  • Usable Energy: 12.86kWh at 80% recommended depth of discharge

  • Nominal Voltage: 51.2 VDC

  • Voltage Range: 47.5–57.6 VDC

  • Capacity: 314Ah

  • Charging Voltage Range: 56–57 VDC

  • Discharging Cutoff Voltage: 47.5 VDC

  • Maximum Continuous Charge Current: 157A

  • Maximum Continuous Discharge Current: 200A

  • Continuous Charge / Discharge Power: 8/10.2 kW

  • Recommended Charging / Discharging Rate: 0.5C

  • Peak Power: 12.8kW (3 sec)

  • Round-Trip Efficiency: 95%

  • Maximum Parallel Units: 16

  • Protection Features: Over/under voltage, overcurrent, short circuit, and high/low temperature

  • Communication Protocols: RS485, CAN

  • Battery Breaker: 250A

  • Charging Temperature: 32–122°F (0–50°C)

  • Discharging Temperature: -4–131°F (-20–55°C)

  • Storage Temperature, Less Than 3 Months: -4–131°F (-20–55°C)

  • Recommended Storage Temperature, Longer Than 3 Months: 59–86°F (15–30°C)

  • Humidity: 5%–95% RH, non-condensing

  • Altitude: 9843 ft. (<3000 m)

  • Cooling Method: Natural convection

  • Connector Type: Degson quick connector/screw terminal

  • Cycle Life: 10000 cycles at 0.5C, 25°C, 80% DOD, to 70% end-of-life capacity

  • Design Life: 10 years

  • UL 1973: Yes

  • UL 9540A: Battery-to-battery spacing of 6 in.

  • UN 38.3: Yes

  • FCC Part 15 (EMC): Yes

  • Protection Class: Class B

Size Guide

  • Dimensions (H x W x D): 34.1 in. x 18.1 in. x 9.6 in. (865 mm x 460 mm x 245 mm)

  • Weight: 293.2 lbs. (133 kg)

Compatibility

UL 9540 Grid-Tied Systems with Closed-Loop Communication: EG4 FlexBoss18 and FlexBoss21.

Off-Grid Non-UL 9540 Installations with Closed-Loop Communication: All BigBattery APEX inverters and all EG4 inverters.

Warranty

Warranty: 10-year EG4 manufacturer warranty; specifications state 10 years or 10000 cycles.

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