The EG4 LifePower4 48V V2 is a 5.12kWh server-rack battery that tells your inverter which language to speak with a six-position DIP switch on its front panel. EG4’s spec sheet lists 16 UL-recognized 3.2V LiFePO4 cells, a 100A BMS, more than 6,000 cycles at 80% depth of discharge and a 10-year warranty. It also lists closed-loop support for up to 64 batteries in parallel, about 327.7kWh. In January 2026, EG4 published an app note on a newer “Model 3” version (SR-48-100-LP4-IN-03) that drops the DIP switches entirely and sets itself up automatically. This guide covers both versions: the specs, the protocol DIP codes for each inverter brand, battery ID addressing, and how to mix old and new units in one rack.
As an Amazon Associate I earn from qualifying purchases, at no cost to you.
EG4 sells the battery through its dealers. You can find specs and documents on EG4’s LifePower4 48V V2 page.
Working on a 48V battery bank is dangerous. Turn off every battery breaker and BMS switch before changing DIP switches or cables, and follow EG4’s manuals and your local electrical code.
Specs from EG4’s spec sheet
| Parameter | LifePower4 48V V2 |
|---|---|
| Nominal voltage / capacity | 51.2V, 100Ah, 5.12kWh |
| Cells | 16 × 3.2V UL-recognized prismatic LiFePO4 in series |
| BMS | 100A internal; max continuous discharge 5.12kW |
| Charge voltage (bulk/absorb) | 56.8V |
| Charge current | 100A max continuous; 30A recommended |
| Low cutoff | BMS 44.8V; recommended 48V ±0.2V or 20% SOC |
| Cycle life | >6,000 cycles at 80% DoD |
| Communication | CAN and RS485; closed loop |
| Parallel / series | Up to 64 in parallel; no series |
| Cell balancing | Passive, 120mA, above 40mV difference |
| Charge temperature | 32–113°F (0–45°C) |
| Discharge temperature | -4–122°F (-20–50°C) |
| Size / weight | 6.1 × 19 × 17.4 in; 99.6 lb (45.2kg) |
| Enclosure | IP20 (indoor) |
| Certifications | UL 1973; UL 9540A passed; UL 9540 listed with the EG4 18kPV-12LV |
| Extras | E-Stop input, dual on-board fire arrestors |
| Warranty | 10 years |
Two numbers are worth a second look. EG4 recommends 30A charging even though the BMS allows 100A, and it recommends stopping discharge at 20% SOC to stay at the 80% depth of discharge its cycle rating is based on. In open-loop setups, EG4 notes that SOC and voltage don’t track each other exactly, so it suggests adjusting the voltage cutoff in 0.2V steps.
Model 2 vs Model 3: check which one you have
The “V2” name now covers two hardware versions. EG4’s app note explains how to tell them apart:
| Model 2 | Model 3 | |
|---|---|---|
| Model number | SR-48-100-LP4-IN-02 | SR-48-100-LP4-IN-03 |
| DIP switches | Yes: 6-position protocol + 6-position ID | None |
| Protocol selection | Set by DIP switch (CAN) or auto-detect (RS485) | Auto-Match: detects the inverter automatically |
| Battery IDs | Set by hand, 1–64 | Auto-ID: master assigns IDs as each battery powers on |
| Terminating resistor | Not required | 120Ω on master Batt Comm 1 and on last battery’s Batt Comm 2 |
| Release firmware | BMS firmware starts with “S” | RS485 Z03T14, RS232 S02T14 |
If your battery has no DIP switches, skip to the Auto-ID section below.
Protocol DIP switch codes (Model 2)
The protocol DIP switch tells the battery which inverter brand’s CAN protocol to use. EG4’s Connections & Paralleling Guide (v1.1.7, section 7.1) lists these codes:
| Code | Inverter brand | Communication | Switches changed in EG4’s diagram |
|---|---|---|---|
| 1 | EG4 / Lux | CAN | 1 |
| 2 | Growatt | CAN | 2 |
| 3 | Sol-Ark | CAN | 1 and 2 |
| 4 | Deye | CAN | 3 |
| 5 | Megarevo | CAN | 1 and 3 |
| 6 | Victron | CAN | 2 and 3 |
| 7 | Luxpower | CAN | 1, 2 and 3 |
| 8 | SMA | CAN | 4 |
| 64 | EG4, Growatt, Schneider | RS485 (auto-detect) | None needed |
The codes follow a binary pattern on switches 1–4. Always match the up/down orientation to the diagram in EG4’s guide and the label on your battery before powering up. A switch set the wrong way just means the battery and inverter won’t talk, but it’s a frustrating thing to troubleshoot.
Switch 6: Complete vs Simplified LINK protocol
Switch 6 sets how the battery talks to other EG4 batteries in the same rack:
- ON = Complete LINK protocol: for mixing with EG4 Indoor and Outdoor WallMount batteries, version 2 LL batteries, and original batteries running Multipack firmware.
- OFF = Simplified LINK protocol: for version 1 LL batteries and the original LifePower4 with Multipack firmware.
EG4 notes that both LINK protocols work only over CAN, not RS485.
RS485 users
On RS485, the battery detects the inverter protocol automatically. EG4 lists EG4, Growatt and Schneider for this mode. Check that your RS485 cable is pinned correctly for your inverter. On the battery side, EG4 lists pin 1 as RS485-B and pin 2 as RS485-A. After any DIP change, EG4 says to turn the BMS switch off and on again so the new setting takes effect.
Battery ID DIP switch (Model 2)
The second 6-position switch sets each battery’s address. EG4’s Quick Start Guide gives the rules:
- The battery set to ID 1 is the host (master). It’s the only one wired to the inverter, through its CAN or RS485 port.
- IDs run from 1 to 64. Every battery in the bank needs a different ID.
- EG4 recommends addressing batteries in ascending order down the rack.
- Link batteries through the Battery-Comm ports, starting at the bottom battery and working up.
- Power on each breaker and BMS switch one at a time, starting with the host.
EG4 also asks you to charge each battery to 100% on its own before paralleling it with others, so the bank starts balanced.
Auto-ID setup (Model 3, no DIP switches)
On the newer batteries, EG4 says the BMS checks for inverter signals when the first battery powers on, picks the right protocol, and names itself ID 1. For example, paired with an EG4 FlexBOSS21, it selects the EG4/Lux protocol with no user setup. Each battery added after it gets the next ID automatically. EG4’s setup steps:
- Turn off every battery breaker in the bank.
- Daisy-chain Batt Comm ports, from Comm Port 1 on the last battery up to Comm Port 2 on the next, until you reach the master.
- Plug the inverter cable into the master’s CAN or RS485 port.
- Fit a 120Ω terminating resistor in Batt Comm 1 on the master and Batt Comm 2 on the last battery.
- Turn on the master’s BMS first, then each remaining battery in order.
- Confirm no faults or protections appear on the batteries or the inverter.
EG4 lists these inverter brands for closed-loop communication. RS485: EG4, Growatt, Schneider and Voltronic. CAN: EG4, Growatt, Sol-Ark, Deye, Megarevo, Luxpower, Pylon, Victron, Solis and Sunny Boy.
Mixing Model 2 and Model 3 in one rack
EG4’s January 2026 app note covers mixed banks. The key points:
- Special cable: any battery-to-battery cable that touches a Model 2 must be wired on RJ45 pins 7 and 8 only, with pins 1–6 left unconnected. Model 3 to Model 3 can use standard Cat 5 or Cat 6.
- Model 3 goes first: the master must be a Model 3, terminated with the 120Ω resistor in its left Battery-Comm port.
- Model 2 IDs continue the count: with three Model 3 batteries, set the Model 2 units to 4, 5, 6 and so on.
- Turn-on order: start with the master Model 3, then the other Model 3s about 5 seconds apart, then the Model 2s in DIP-ID order.
- Firmware: both models share BMS firmware starting with “S”, but communication-board firmware starting with “Z” is model-specific. EG4 asks owners to confirm with its support team before flashing.
How much storage do you need? (estimate)
| Batteries | Nameplate | Usable at 80% DoD | Example backup (estimate) |
|---|---|---|---|
| 1 | 5.12kWh | ~4.1kWh | Fridge, lights, internet for about a day |
| 2 | 10.24kWh | ~8.2kWh | Essential loads overnight plus a well pump |
| 4 | 20.48kWh | ~16.4kWh | Most of an average home’s daily use |
| 6 | 30.72kWh | ~24.6kWh | A full day with some AC, or two days of essentials |
Usable figures follow EG4’s 20% SOC cutoff recommendation. The backup examples are my rough estimates and depend on your loads. Power is the other limit: each battery is rated for 5.12kW continuous, so a 12kW inverter needs at least three batteries to deliver its full output from the bank (estimate).
Where it fits
The LifePower4 V2 is a rack battery for DIY home and off-grid systems built around a 48V hybrid inverter. EG4 lists it as UL 9540 listed with its 18kPV-12LV, which helps with permits. I cover that inverter in my EG4 18kPV review. If you’re still choosing an ecosystem, see Victron vs EG4. Victron users will want protocol code 6. If you’d rather mount batteries on a wall than in a rack, EG4’s WallMount line is the alternative, and I cover the 314Ah version in my EG4 WallMount 314Ah review.
It’s an indoor battery (IP20), so plan for a conditioned or at least sheltered space within its 32–113°F charging range. EG4 publishes a separate battery spacing white paper for rack layouts.
FAQ
What DIP switch setting do I use for a Victron inverter?
Protocol code 6 on a Model 2 battery, over CAN, per EG4’s guide. Model 3 batteries detect the protocol automatically.
What is the DIP setting for Sol-Ark?
Code 3, over CAN.
Do I need to set DIP switches on RS485?
No protocol code is needed. EG4 says the battery auto-detects EG4, Growatt and Schneider over RS485. You still set a unique battery ID on Model 2 units.
How many LifePower4 V2 batteries can I parallel?
Up to 64, per EG4, for about 327.7kWh. They can’t be connected in series.
Can I mix the V2 with an original LifePower4?
Yes, with conditions. EG4 says original batteries need Multipack firmware, and switch 6 on the V2 selects Complete or Simplified LINK protocol depending on what else is in the rack.
What’s the warranty?
10 years, per EG4’s spec sheet. EG4 asks owners to register the product on its warranty page.