1. Configure the battery Ah capacity

The installer must program in the "C20" Ah capacity of the battery bank. The battery voltage is automatically detected.

("C20" means the Ah capacity when the battery is discharged over 20 hours)

Press the Setup key for 2 seconds - the display shows 'Cb    0200Ah'

Use the Select key and (+) and (-) keys to set the Ah value

Press the Setup key for 2 seconds to lock your setting

Press the Setup key again for 2 seconds and the display goes back to normal operation

2. Sync the State of Charge (SOC)

The State of Charge needs to be calibrated - this happens automatically when the battery reaches a full state of charge.

You can also sync manually: hold the (+) and (-) keys simultaneously for 3 seconds to set State of Charge to 100%.

3. Configure the rest of the settings if required

The default settings are suitable for a standard lead-acid battery bank.

The standard settings are shown in the table below, you can change these values to change how your BMV behaves.

The BMV has an 'alarm relay' which can be used to switch a back-up generator.

The Discharge Floor sets the low State of Charge (default 50%) when the generator switches on.

The Clear SOC relay determines the high State of Charge (default 90%) when the generator is switched off.

You can also set the Relay minimum enable time and Relay disable delay to control how long the generator is allowed to run.

Question - what about Li-ion batteries?

The default Charged Voltage is often suitable for the most common Li-ion batteries (LiFePo4 type).

Some Li-ion chargers stop charging when the charge current drops below a set level - the Tail current value may need to be increased so that the full State of Charge is detected.

The Charge Efficiency Factor (CEF) should be set at 99% to reflect the higher efficiency of Li-ion batteries.

With Li-ion batteries the Peukert exponent (PC) should usually be set to 1.15 but please check the suppliers datasheet.