Magnum Energy Integration Guide

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SimpliPhi Power, Inc. | 3100 Camino Del Sol | Oxnard, CA 93030, USA | [phone] | [e-mail] | SimpliPhiPower.com
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3.1 – Discharge Calculation: Inverter Power Bank Sizing
To optimize the PHI battery bank and protect against over-discharge and voiding the battery Warranty,
the PHI battery bank should be sized at least double (2x) the kW rating of the inverter.
Discharge Example
This example uses the following calculation:
B
#Inv
≥ Inv
kW
/ Bat
kW
This example assumes the following:
• Inverter is rated at 4.4 kW
• PHI 3.5 48V battery has a load rating of 1.74 kW (34 Amps DC x 51.2 Volts nominal)
The calculation and assumptions correspond to:
B
#Inv
≥ 4.4 kW / 1.74 kW = 2.53
So, a properly sized PHI battery bank based on maximum discharge of the inverter would have a
minimum of 3 batteries.
Discharge Example: B
#Inv
≥ Inv
kW
/ Bat
kW
• Inverter is rated at 4 kW
• PHI 3.5 24V battery has a load rating of 1.15 kW (45 Amps DC x 25.6 Volts nominal)
•
B
#Inv
≥ 4 kW / 1.15 kW = 3.48
In this example, a properly sized PHI battery bank based on maximum discharge of the inverter
has a minimum of 4 batteries. This ensures no greater than C/2 battery load. If the PHI battery bank
has fewer batteries than calculated, configure the inverter settings to limit the load below the specified
rating of the PHI battery. These settings are described in the following sections of this Integration Guide.