Guide

Epever settings for a LiFePO4 battery

Epever's built-in lithium profile is a compromise. Here is what it uses, why many owners change it, and the values we run on a 12 V LiFePO4 battery, with the rules the controller enforces.

What the built-in LiFePO4 profile uses

The current Epever manuals (XTRA-N G3, Tracer AN G3) list these values for the built-in LiFePO4 profile, LFP4S, at 12 V:

Setting	Built-in value
Float charging	13.3 V
Boost / equalize charging	14.2 V
Boost reconnect	13.0 V
Low voltage reconnect (load back on)	12.8 V

Owners also report a boost duration of only 10 minutes on this profile. A float of 13.3 V lets a LiFePO4 battery drift down before charging resumes, and a short boost rarely leaves time for the cells to balance.

The values we use on a 12 V LiFePO4

These are the settings validated on our own test van (300 Ah, 4 cells, BMS over-charge protection at 14.6 V). They follow Epever's lithium rules and the battery maker's recommendations. Set the battery type to User first, otherwise the controller ignores custom voltages.

Setting	Value	What it does
Over voltage disconnect	14.80 V	Stops charging to protect the battery
Charging limit	14.50 V	Highest voltage the controller charges to
Over voltage reconnect	14.50 V	Charging resumes after an over voltage cut
Equalize charging	14.40 V	Equal to boost: lithium is never equalized
Boost charging	14.40 V	Main charging voltage
Float charging	13.50 V	Held once the battery is full
Boost reconnect	13.00 V	Below this, a new boost starts
Low voltage reconnect	12.40 V	Load output switches back on (see the note below)
Under voltage warning reconnect	12.20 V	Warning clears
Under voltage warning	12.00 V	Low battery warning
Low voltage disconnect	11.30 V	Load output switches off
Discharging limit	11.00 V	Lowest allowed voltage

Boost duration 120 minutes, equalize duration 0 minutes. With a lithium battery, also set the low-temperature limits: no charging below 0 °C, no discharging below -20 °C.

Why 12.40 V to reconnect? It is a balance between two problems. Set too low, the load comes back too early: after a low voltage cut, the battery voltage bounces back up as soon as the load is off, so the load switches straight back on without any recharge, and is cut again a minute later. Set too high, the load stays off much longer than needed, and your van is left without electricity when you may need it. 12.40 V waits for a real recharge without keeping you in the dark.

For 24 V (8 cells) multiply every voltage by 2, for 48 V (16 cells) by 4.

The rules the controller enforces

Epever rejects a set of custom voltages that breaks its ordering rules, sometimes after writing only part of it. The rules from the manual (section 4.1):

Over voltage disconnect > charging limit ≥ equalize ≥ boost ≥ float > boost reconnect
Over voltage disconnect > over voltage reconnect
Low voltage reconnect > low voltage disconnect ≥ discharging limit
Under voltage warning reconnect > under voltage warning ≥ discharging limit
Boost reconnect > low voltage reconnect
Lithium only: equalize = boost, and over voltage reconnect = charging limit
Every value between 9 and 15.5 V per 12 V (over voltage disconnect up to 17 V)

Check your BMS. Epever's manual adds two rules that depend on your battery's own protection (BMS): the over voltage disconnect at least 0.2 V above the BMS over-charge protection, and the low voltage disconnect at least 0.2 V above the BMS over-discharge protection. Your battery's manual gives these values. Our 14.80 V matches a BMS that cuts at 14.6 V.

Doing it with OmniViz Solar

OmniViz Solar ships with these LiFePO4 values as a ready-made preset for 12, 24 and 48 V. Pick it, enter your battery's capacity, and push it to the controller: the app reads the current settings first, shows you every change, saves a backup, checks Epever's rules, writes the whole set at once, and reads it back to confirm.

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