Samlex Integration Guide

REV070219
SimpliPhi Power, Inc. | 3100 Camino Del Sol | Oxnard, CA 93030, USA | [phone] | [e-mail] | SimpliPhiPower.com
| 5 |
2.1 – 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 2.2 kW
• PHI 730 kWh-24V battery has a maximum continuous discharge rate of 14 Amps DC, or
0.3584 kW at the battery’s 25.6V nominal voltage
B
#Inv
≥ 2.2 kW / 0.3584 kW = 6.14
A properly sized PHI battery bank based on maximum discharge of the inverter would have a
minimum of 7 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.
2.2 – Charge Calculation: Charge Controller Power Sizing
To optimize solar harvesting, a properly sized PHI battery bank should be able to accept the maximum
PV charge current. To determine the minimum number of PHI batteries required to optimize PV, divide
the output of the charge controller(s) by the “max continuous charge current” per PHI battery. Be sure to
verify the “max continuous charge current” for the PHI battery model that you’re using, because it may
differ from C/2 depending on the model.
Charge Example
This example uses the following calculation:
B
#PV
≥ I
PVChrgMax
/ I
BatChrgMax
This example assumes the following:
• Max. continuous charge current for PHI 730 24V = 14A
• PV charge controller max = 30A
B
#PV
≥ 30A / 14A = 2.14
In this example, a properly sized PHI battery bank based on the available PV charge has a
minimum of 3 batteries. This maximizes the use of available PV while ensuring the batteries are never
stressed by overcharging. If the PHI battery bank has fewer batteries than calculated, configure the
inverter settings to limit the charge rate below the specified rating of the PHI battery. These settings are
described in the following sections of this Integration Guide.
In summary: When comparing the same system using these two calculations to size the PHI
battery bank, the minimum number of batteries should be the greater of the two results (Discharge
Calculation & Charge Calculation). In this example, this translates into 7 PHI batteries in the
system.
Note: Samlex charge controllers are not compatible with PHI batteries.