zrn984 - dc analysis_50a.xls
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0 DC POWER ANALYSIS
4G3 EARLY START PROJECT
Site no.: ZRN984 Date : April 18, 2023
Region : CENTRAL
U900+G900 COMBINEDLoad 0 + 6 + 6 + 6 :
2517.00Watts
Load 0 + 1 + 1 + 1 : Watts
3G 2100 Load 0 + 4 + 4 + 4 : 2426.00 Watts
LTE1800 Load 0 + 1 + 1 + 1 : 1655.00 Watts
LTE2300 Load 0 + 1 + 1 + 1 : 1456.00 Watts
TRM : 300.0 Watts
Battery Rating 300 Ah
Rectifier Size 65 Amperes
TOTAL REQUIRED POWER BY 0 SYSTEM : 8354.00 Watts
Plus 8% battery charging 8354.00 W x 1.08 : 9022.32 Watts
RECTIFIER CALCULATION
Total required current by the equipment 9022.32 / 54 Volts : 167.08 Amperes
No. of required rectifiers 167.08 A / 65 A : 2.57
say : 3.00 Units
Total no. of required rectifiers including
standby and future loads ( n + 1 ) : 4 Units
BATTERY STRING CALCULATION
Total demand load : 8354.00 Watts
Total current requirement by the equipment
from the battery system 8354.00 W / 48.0 Volts : 174.04 Amperes
No.of 300 AH battery string to meet the above requirement
4 hours = 174.04 / 60 = 2.90 : 2 Strings
STC STANDARD
REQUIRED DC POWER UNITS
Required Rectifiers 65 Ampere : 4 Units
Required Battery Strings 300 Ampere Hour : 2 Strings
EXISTING DC POWER UNITS
Existing Rectifiers 65 Ampere : 3 Units
Existing Battery String 300 Ampere Hour : 2 Strings
MISSING DC POWER UNITS
Missing Rectifiers 65 Ampere : 0 Units
Missing Battery String 300 Ampere Hour : 0 Strings
ADDITIONAL DC POWER UNITS
Additional Rectifiers 65 Ampere : 1 Units
Additional Battery String 300 Ampere Hour : 0 Strings
With 2 x 300 AH battery strings, battery back up time of 2.76 hours can be achieved.
Type of existing + NEW rectifier : 4 x 65 A 0
Type of existing + NEW battery String : 2 x 300 AH 0
Maximum number of rectifier modules can be installed : 9
NOTE: Therefore install new 1 0
in order to adequetely carry the loads.
No. of Rt's ERICSSON RBS6201
rectifier modules and battery strings to DC powerplant