ASHAPOWER NOVA-40 Manuale d'uso - Pagina 8

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charging voltage, to remove sulfation and bring all cells of the battery to similar levels by increasing the

voltage to 2.50V/cell or 10 percent higher than the recommended charging voltage. Equalization charging

also equalize acid stratiﬁcation, a condition where acid concentration is greater at the bottom of stationary

batteries than at the top level. Battery experts recommend periodic equalization charging to keep the

batteries healthy (once in every three month).

SMF, VRLA, AGM, GEL Batteries.

SMF (sealed maintenance free), SLA (Sealed lead acid) and VRLA (Valve regulated lead acid) batteries are

same. Its 2 types of cells are (AGM (Absorbed glass mat) and GEL cells. They are maintenance free batteries

which do not require regular water ﬁlling, its composition of electrodes and electrolyte is same as ﬂooded lead

acid batteries. These batteries do not need to be kept upright as the electrolyte is in the form of gel or paste).

Un-attended equalization charging of battery is risky as there is chance for overheating of battery

plates, overﬂowing of electrolyte and damaging of batteries.

Remove all loads from the batteries before starting equalization charging. Fill all the battery cells with distilled

water in the required level. It is better to remove all the lids of the batteries before starting equalization

charging as the batteries will begin gassing and bubbling vigorously at the peak stage of boost charging.

Ensure the batteries are installed in a good ventilated area. Even a spark from a metal cutter, loose contact of

battery wires may cause ﬁre hazard and explosion of batteries. During equalization charging, check the

changes in the speciﬁc gravity of acid of each cells every hour and stop charging if the gravity and voltage of

cells no longer rises during the gassing stage. Further improvement of the cell is not possible and continued

charging will spoil batteries.

Enabling limited ampere charging in MPPT charge controller.

Enter settings menu 13. AMP-LT

Select option "0" to disable all initial limited ampere charging. (In default the charger is preset in "0"mode)

Select option "1"

for limited ampere charging up to the preset value of 7th menu.(Grid to Solar shifting volt)

(14.2V default) When kept in this mode charger delivers only 30 amps of charging current to the

connected battery if the Ah is set to 150. After shifting to solar mode the entire current is shared between

the connected inverter load and for battery charging.

Select option "2"

for limited ampere charging up to the preset value of 2nd menu. (Bulk charging limit)

(14.8V default) Charger delivers only 30 amps of charging current to the battery if the Ah is set to 150 and

the ampere limit is released when the charger enters float charging mode.

Select option "3"

for ampere limiting irrespective of charging mode.

If the battery is still in float charging mode in the morning, the charge controller will not limit the charging

current and the entire ampere will enter the battery.So it is recommended to set the option 3 to start with initial

limited amp charging everyday morning.

Enabling equalization charging in MPPT charge controller.

Enter settings menu and conﬁgure menu 5.N-DAYS "0" to disable all modes of equalization charging.

Enter settings menu and conﬁgure following settings for enabling equalization charging.

3.EQLZ-V :

Set the equalization voltage.

As the equalization is an over charging process, ask a battery expert before setting the maximum applicable

upper voltage limit. Blind settings will spoil the batteries.

4.BVLC-V :

Select the battery low voltage level to enable equalization charging based on battery terminal

volt. (Conﬁgure a value slightly less than inverter low voltage cut o to avoid frequent equalization charging)

5.N-DAYS :

Set period of Equalization charging.

N-DAYS = 0 =>Disables all modes of Equalization charging

N-DAYS = 1 =>Equalization charging starts every alternate days

N-DAYS = 2 =>Equalization charging starts every 2 days

............................................................................................

N-DAYS = 30 => Once in a month (Recommended)

N-DAYS = 90 => Once in 3 months

N-DAYS = 180 => Once in 6 months

13.AMP-LT :

It is recommended to preset AMP-LT in mode "2" (initial limited ampere charging) on

Equalization charging mode.This option is recommended because system will not shift from grid to solar

mode till the equalization charging is completed which helps to rise battery terminal voltage gradually

and attains maximum gravity of electrolyte and gets good backup from batteries.

(See function settings page in user manual)