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Home Batteries 340ELR 12.8v 340 AH 4.4 kWh Victron Coms Bluetooth Zigbee Thread Heating Lithium Battery

340ELR 12.8v 340 AH 4.4 kWh Victron Coms Bluetooth Zigbee Thread Heating Lithium Battery

SKU: 340ELR

Stock Status: In Stock

Shipping Availability: March 10th 2026

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340ELR
340ELR
340ELR
340ELR
340ELR
340ELR
340ELR

Summary

When you need capacity above all else the 340ELR is your battery of choice. Using REPT 345 cells that test well into the mid 350AH, the 340ELR sets the bar for most capacity in its class. Featuring our latest network card that adds support for Zigbee & Thread, Bluetooth 5, and a FCC certified ESP32 MCU, the 340ELR includes all the SFK enhancements such as Enhanced Victron communications, triple heating modes (low temp, standby, or Venus OS/Victron controlled) with new hardware I/O with a waterproof usb-c port and more app features than any of the SFK batteries preceding it.

Max Discharge (Amps)

Max Discharge (Amps)

160
Battery Capacity (AH)

Battery Capacity (AH)

340
Voltage

Voltage

12.8,13.0,13.6
Cycle Life

Cycle Life

8000 at 80% DOD
Data Port

Data Port

RS-485 Port ,USB-C Port
Heating System

Heating System

Auto & Manual,Victron Controlled
Peak Output Power (kW)

Peak Output Power (kW)

2.0

Battery Upgrades

I/O Switch

I/O Switch

The GEN 3A switch is included on the 340ELR and it includes the ability to view the SOC of the battery as well as select between Bluetooth, Zigbee or Thread protocols.

Included on the 340ELR at no additional cost.

SFK GEN2 B Switch
SFK GEN2 B Switch
SFK GEN2 B Switch
Data Port

Data Port

This RS485 (half duplex) connection will allow you to get BMS data from your battery. Required for Victron Communication.

RS-485 port is included at no additional charge.

Add RS485 Data Port
Add RS485 Data Port
Add RS485 Data Port
Add RS485 Data Port

USB-C port is included at no additional charge.

USB-C Port
USB-C Port
SFK Data Cable

SFK Data Cable

This cable is required for communication to to inverters, computers, and devices like the Victron Cerbo GX/S. The cable requires the RS485 port on the battery.

6 feet in length with usb-c ports. Included at no additional charge.

The length is about 10 feet, 3050mm.

Sun Fun Kits RS-485 to USB-A Data Cable
Sun Fun Kits RS-485 to USB-A Data Cable

Battery Accessories

Add Jacket

Add Jacket

1" Insulation all around, greatly improves heating performance.

Insulated / Weather proof battery Jacket Free!
Insulated / Weather proof battery Jacket Free!
Insulated / Weather proof battery Jacket Free!
Insulated / Weather proof battery Jacket Free!
Battery Cable Kit

Battery Cable Kit

Great way to add a quick disconnect to your battery, rated for up to 175A.

Lithium Charger

Lithium Charger

The SFK-PS-400 is a 30 amp / 400 watt charger and can charge your battery from 0% to 100% in about 10 hours (overnight).

Summary

Estimated Availability: March 10th 2026

Our Starting Price

$995.00

Configuration Price

$995.00

Pre-Order deposit (due today):

Description

Features

  • 4.4 (range is between 4.3 - 4.5 kWh on average) kiloWatt hours of reliable lithium power, replaces up to 6 lead acid / agm batteries (100ah) and is designed to be discharged to 100% of available capacity without harm to the battery.
  • Up to 2.0 kiloWatts of peak power, and 1,200 Watts of continuous power.
  • 160 amp discharge capable, 125 amp continuous rating (can run 125 amps form 100% to 0% without hitting thermal cut-off limit).
  • GEN 3 A switch which includes multiple wireless protocols and an onboard SOC monitor.
  • Expected cycle life of 8000 cycles at 80% DOD, and up to 11000 cycles at 50% DOD, 12-15 year usage life.
  • Fully compatible with existing 12v infrastructure including standard 12v lead acid/agm battery chargers, trickle chargers and high voltage DC systems up to 48v (when linked in series with 4 batteries).
  • Built-in cell heaters to allow for low temperature charging, temperature to activate heaters can be set inside the app, users can also test heating via the app.
  • Triple Heating Modes! The only battery on the market that lets users select how the heating system works, select form automatic low temp charging heating, or use standby heating to keep the battery warm even when its idle, or let Venus O.S. (Victron, control the heating for with Synchronized Heating).
  • User selectable Max/Min State of charge, you can set upper and lower state of charge limits on your battery, e.g. set a lower limit of 20%, once the battery reaches this limit discharging will become disabled. Alternatively you can set an upper limit to 80%, so now you can leave your rv/coach plugged in and your battery will not be stressed as it will stop charging at 80% there by extending it's life.
  • Data Port allows direct integration with Victron systems with the Venos OS compatible devices like the Cerbo GX (when using the SFK data cable or usb-c cable), other systems like Votronics, Growatt, Lux Power and many more will become available when the SFK hub is released. 
  • New options to regulate HIGH state of charges, where the 340ELR will automatically discharge it self to a lower healthier state of charge when not being used.
  • New usage logs for superior battery analytics and statistics.
  • More options for fine tuning active balance behavior to achieve perfect and efficient balancing.
  • Smart phone/device compatible with Bluetooth monitoring/configurable app. Available for IOS/Android.
  • Can be linked in series up to 48v (4 batteries in series) as well as up to 4 in parallel with a combined output of 5.0 kW continuous.
  • Automatic low/high temperature and low/high voltage cut-off to stop battery damage from occurring.
  • Automatic short circuit prevention as well as over charge and over discharge prevention.

Recommended Uses

  • Use in RVs as a 12-48 volt power source, or as part of an inverter bank to provide standby power
  • Use in solar panel installs as a power source for storing power
  • Use in troller motor applications for boats (requires ensuring that the battery is isolated and protected from water intrusion)
  • As a DC power source for power supplies and other items needing DC power
  • Use in DC to AC inverters where standby / backup power is needed such as data centers, or residential power sources.

Downloads

SFK-340ELR.pdf
SFK340ELR-1.4C.pdf

Properties

GTIN 00850036385349
Manufacturer Sun Fun Kits
SKU 340ELR
Freight Class 60
Battery Specs
Chemistry LifePo4 (lithium Iron Phosphate)
Data Port RS-485 Port , USB-C Port
Certification Standard UL 1642 , UL 9540A
Heating System Auto & Manual , Victron Controlled
Cycle Life 8000 at 80% DOD
Peak Output Power (kW) 2.0
Continuous Discharge (Amps) 125
Recommended Discharge (Watts) 800
Continuous Discharge (Watts) 1200
Cells 4
Battery Capacity (AH) 340
Voltage 12.8 , 13.0 , 13.6
Watt Hour Capacity (kWh) 4.4
Max Discharge (Amps) 160
Max Charge (Amps) 120
Construction Material ABS, Aluminum, PCB
Battery Weight (Lbs) 62
Balance Capacity (AH) 5200
Terminal Bolts M8
Physical Specs
Item Weight 60.05 lbs , 27.24 Kg
Height 11.6 Inch , 290 MM , 10.6 Inch Without Terminal Screws
Width 180 MM , 7.5 Inch
Length 345 MM , 13.6 Inch , 14.6 Inch / 371 MM Including handles
General Information
Country of Origin USA , China
Service and Support Serviced, Repairs in USA
Warranty 8 Year 60/96 Month Warranty , 10 Year 60/120 Month Warranty (Dealer Installed)

Customer Reviews

Frequently Asked Questions