NOMAD E2 and E2 ULTRA Battery Charging Guide

Recommended Charging Settings for three stage charging

Stage 1. Bulk. Check the maximum current rate for your size E2 battery, this is listed on that models specification sheet, do not exceed that rate.

Stage 2. Absorption The recommended voltage for absorption is between 2.4V – 2.44V per cell (14.4 – 14.6V for a 12V battery), 14.6V is Recommended. Never ever exceed 2.45V per cell (14.70V for a 12V battery).

Stage 3. Float. Float voltage should be between 13.5V and 13.8V. 13.7V Recommended.

On Battery Chargers and Solar Chargers, choose the battery type selection that best matches these settings.

NOMAD E2 ULTRA G2 Battery Charging Guide

Recommended Charging Settings for three stage charging

The E2 ULTRA G2 charges at a higher voltage than the E2 and E2 ULTRA. Don’t use the E2 settings above, they are too low for this battery and it will not reach a full charge.

Stage 1. Bulk. The maximum charging current depends on the size of your battery: 19Ah is 3A, 160Ah is 20A, 300Ah is 40A. Do not exceed that rate.

Stage 2. Absorption. The recommended voltage for absorption is between 14.6V and 14.8V for a 12V battery, 14.7V is Recommended. Never ever exceed 14.80V.

Stage 3. Float. Float voltage should be between 13.5V and 13.8V. 13.7V Recommended.

On battery chargers and solar chargers, choose the battery type selection that best matches these settings.

NOMAD C2 CARBON Battery Charging Guide

Recommended Charging Settings for three stage charging

The C2 CARBON charges at a lower voltage than the E2. Don’t use the E2 settings above, they are too high for this battery.

Stage 1. Bulk. The maximum charging current depends on the size of your battery: 85Ah is 25A, 140Ah is 40A, 220Ah is 65A. Do not exceed that rate.

Stage 2. Absorption. The recommended voltage for absorption is between 14.1V and 14.4V for a 12V battery, 14.3V is Recommended. Never ever exceed 14.40V.

Stage 3. Float. Float voltage should be between 13.3V and 13.7V. 13.6V Recommended.

On battery chargers and solar chargers, choose the battery type selection that best matches these settings. The C2 will also take a much faster charge than a standard AGM, 0 to 80% in around 2 hours, so it is possible to set the charging rate to be much higher in your charging setup.

SETTINGS FOR SPECIFIC CHARGERS

The settings below are for the E2 and E2 ULTRA range. If you have an E2 ULTRA G2 or a C2 CARBON, use your own section above instead: the G2 wants 14.6V to 14.8V absorption, and the C2 wants 14.1V to 14.4V, not 14.6V.

CARSPA 12/24V 20/40/60/80A MPPT Solar Charge Controller

Absorb Voltage. 14.6V for 12V System. 29.2V for 24V System.

MUSTPOWER PC1600 MPPT Solar Charge Controller Series

(20A, 30A, 40A , 45A, 60A)

PC1600 uses different terminology in the menu and manual. Use the following x2 and x4 for 24V and 48V systems.

Menu (what it means in other literature) recommended setting

Setting 4, Absorb Voltage, 13.5V for 12V System

Setting 5, Refloat Voltage, (Float Voltage), 13.7V for 12V System

Setting 6, Float Voltage. (Absorb Voltage), 14.6V for 12V System

Setting 7, Max Charging Current. This is listed on your size battery’s specification sheet (or as high as you can set it up to that figure)

Absorb Current. Set this to the lower of the: max charge current of your battery and the maximum charge rate of the controller

NOTE: If you have batteries in parallel then multiply the current values by the number of batteries you have in parallel, as they are sharing the charging current

MUSTPOWER PV18 Solar Inverter Series

The default AGM setting on these inverters is too low. Change battery type to user defined and adjust voltages to this

24V batteries set absorption stage voltage to 29.2V

48V batteries set absorption stage voltage to 58.4V

On PV18 HM series Inverters this is settings 45 and 46

3kva [46] 29.2V

5kva [46] 58.4V

Float is ok as the default

3kva [45] 27.4V

5kva [45] 54.8V

On PV18 VHM series Inverters this is settings 14, 17 and 18

Change battery type in setting [14] to User Defined USE

3kw [17] 29.2V

5kw [17] 58.4V

3kw [18] 27.4V

5kw [18] 54.8V

MUSTPOWER Inverter Chargers

Choose setting ‘AGM 2’

Other Chargers

In general choose the setting that says AGM, Sealed, Lead Acid in that order of preference.

State of Charge vs. Battery Voltage for Sealed Lead Acid Batteries

(not disturbed by charging or discharging effects and with surface charge removed)