Samlex-america SAM-3000-12 User Manual download pdf (Page 13)

10 | SAMLEX AMERICA INC.

SAMLEX AMERICA INC. | 11

Figure 4.4 above shows a series – parallel connection consisting of four 6V, 200 Ah batteries

to form a 12V, 400 Ah battery bank. Two 6V, 200 Ah batteries, Batteries 1 and 2 are con-

nected in series to form a 12V, 200 Ah battery (String 1). Similarly, two 6V, 200 Ah batteries,

Batteries 3 and 4 are connected in series to form a 12V, 200 Ah battery (String 2). These two

12V, 200 Ah Strings 1 and 2 are connected in parallel to form a 12V, 400 Ah bank.

Caution!

When 2 or more batteries / battery strings are connected in parallel and are then connected

to an Inverter Charger (See Figs. 4.3 and 4.4 given above), attention should be paid to the

manner in which the Inverter Charger is connected to the battery bank. Please ensure that

if the Positive output cable of the Inverter Charger (Cable “A”) is connected to the Positive

batterypostoftherstbattery(Battery1inFig.4.3)ortothePositivebatterypostofthe

rstbatterystring(Battery1ofString1inFig.4.4),thentheNegativeoutputcableofthe

Inverter Charger (Cable “B”) should be connected to the Negative battery post of the last

battery (Battery 4 as in Fig. 4.3) or to the Negative Post of the last battery string (Battery 4 of

Battery String 2 as in Fig. 4.4). This connection ensures the following:

• Theresistancesoftheinterconnectingcableswillbebalanced.

• Alltheindividualbatteries/batterystringswillseethesameseriesresistance.

• Alltheindividualbatterieswillchargeatthesamechargingcurrentandthus,willbe

charged to the same state at the same time.

• Noneofthebatterieswillseeanoverchargecondition.

If the Positive output cable of the Inverter Charger (Cable “A”) is connected to the Positive

batterypostoftherstbattery(Battery1inFig.4.3)ortothePositivebatterypostofthe

rstbatterystring(Battery1ofString1inFig.4.4),andtheNegativeoutputcableofthe

InverterCharger(Cable“B”)isconnectedtotheNegativebatterypostoftherstbattery

(Battery1asinFig.4.3)ortotheNegativePostoftherstbatterystring(Battery1ofBattery

String 1 as in Fig. 4.4), the following abnormal conditions will result:

• Theresistancesoftheconnectingcableswillnotbebalanced.

• Theindividualbatterieswillseedifferentseriesresistances.

• Alltheindividualbatterieswillbechargedatdifferentchargingcurrentandthus,

will reach fully charged state at different times.

• Thebatterywithlowerseriesresistancewilltakeshortertimetochargeas

compared to the battery which sees higher series resistance and hence, will

experienceovercharginganditslifewillbereduced.

Sizing Inverter Battery Bank

The following basic rules are used to determine the size of the battery bank:

• ActivePowerinWatts(W)=

VoltageinVolts(V)xCurrentinAmperes(A)xPowerFactor ...................... Formula 1

• Foraninverterrunningfroma12Vbatterysystem,

the DC current required from the 12V batteries is the

AC power delivered by the inverter to the load in Watts (W)

divided by 10 ..................................................................................................... Formula 2

• Energyrequiredfromthebattery=

DCcurrenttobedelivered(A)xtimeinHours(H) ........................................ Formula 3

• AsaRuleofThumb,Ahcapacityofthebatteriesrequired=

2xEnergyrequiredfromthebattery ............................................................. Formula 4

SECTION 4 | Installation

11002-SAM-1000-1500-2000-3000-12-0814.indd 13 14-08-12 9:59 AM

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 31 32

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Samlex-america SAM-3000-12 User Manual Page 13

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