Installation Manual

2. The AC input voltage falls < 85 VAC – the charger reduces the charge

current to zero to help stabilize the incoming AC voltage; or

3. FET Temperature.

The automatic 4-stage charging process includes:

Bulk Charging: This is the initial stage of charging. While bulk

charging, the charger supplies the battery with constant current.

The charger remains in bulk charge until the absorption charge

voltage is achieved (14.6 VDC/12 volt models or 29.2 VDC/24 volt

models)* – as determined by the Battery Type selection**.

Absorb Charging: This is the second charging stage and begins

after the bulk voltage has been reached. Absorb charging pro-

vides the batteries with a constant voltage and reduces the DC

charging current in order to maintain the absorb voltage setting.

The absorb charging time is 120 minutes – as determined by the

Battery AmpHrs selection**.

Float Charging: The third charging stage occurs at the end of the

absorb charging time. While ﬂ oat charging (also known as a main-

tenance charge), the batteries are kept fully charged and ready if

needed by the inverter. The Float Charging stage reduces battery

gassing, minimizes watering requirements (for ﬂ ooded batteries),

and ensures the batteries are maintained at optimum capacity.

In this stage, the charge voltage is reduced to the ﬂ oat charge

voltage (13.4 VDC/12 volt models or 26.8 VDC/24 volt models)*

— as determined by the Battery Type selection** — which can

maintain the batteries indeﬁ nitely.

Full Charge (Battery Saver™ mode): The fourth stage occurs

after four hours of ﬂ oat charging. The Full Charge stage maintains

the batteries without overcharging, preventing excessive loss of

water in ﬂ ooded batteries or drying out of GEL/AGM batteries. In

this stage, the charger is turned off and begins monitoring the

battery voltage. If the battery voltage drops low (≤12.7 VDC/12

volt models or ≤25.4 VDC/24 volt models), the charger will auto-

matically initiate another four hours in ﬂ oat charge.

* These voltage settings are based on the Battery Temperature Sensor

(BTS) being disconnected, or at a temperature of 77° F (25° C). If the BTS

is installed, these voltage settings will increase if the temperature around

the BTS is below 77° F (25° C), and decrease if the temperature around the

BTS is higher than 77° F (25° C).

** The MM-AE Series uses changeable settings (see Table 6, Inverter Default

Settings) that are adequate for most installations. However, if you determine

that some of your operating parameters need to be changed, the ME-RC50

remote control can be purchased to allow changes to those settings.

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3.0 Operation