Outback Power Integration Guide

SimpliPhi Power, Inc. | 3100 Camino Del Sol | Oxnard, CA 93030, USA | [phone] | [e-mail] |
SimpliPhiPower.com
| 4 |
REV101918
1.0 – Introduction
This integration guide covers the recommended setup and configuration of Outback Power equipment for
optimizing performance with SimpliPhi PHI 3.5 kWh batteries. More information on SimpliPhi products can
be found on our website: http://simpliphipower.com/.
Outback Power offers many products which are too numerous to be covered here. The specific Outback
Power products covered in this guide include, but are not limited to:

Radian Series Inverters/Chargers

FLEXmax Series Charge Controllers

FXR/VFXR Series Inverters/Chargers

MATE Series System Display & Communications

OPTICS RE System Monitoring & Control

FLEXnet DC
2.0 – Charge Controller and Inverter Settings
Outback Power has performed qualification testing of the PHI 3.5 kWh battery with their equipment. Per their testing
and recommendations, the following parameters (refer to the table below) have been validated. More information on
Outback products can be found on their website: http://outbackpower.com/.
3.0 – Battery Bank Sizing
A properly sized PHI battery bank should be at least double (2x) the kW rating of the inverter(s) and have
a C/2 rating greater than the maximum charge controller rating. Depending on the specifications of the
equipment used in the system, sizing the PHI battery bank based on these two criteria may yield different
results. Therefore, the best practice is to calculate the PHI battery bank based on both criteria and use
the greater of the two results as the minimum quantity. We can compare these two calculation methods
assuming the nomenclature below:

Battery rated power = Bat
kWh
(typically @ C/2)

Inverter power full load = Inv
kW

Maximum battery charge current = I
BatChrgMax

PV charge controller maximum = I
PVChrgMax

Recommended minimum number of batteries = B
#
Discharge equation: B
#Inv
≥ Inv
kW
/ Bat
kWh
Charge equation: B
#PV
≥ I
PVChrgMax
/ I
BatChrgMax
3.1 – Discharge Calculation: Inverter Power Bank Sizing
To optimize the PHI battery bank and protect against over-discharge (voiding the battery Warranty), the
PHI battery bank should be sized at least double (2x) the kW rating of the inverter.
Discharge Example: B
#Inv
≥ Inv
kW
/ Bat
kWh

Inverter is rated at 8 kW

Battery is rated at 3.5 kWh, therefore the C/2 load rating is 1.75 kW
B
#Inv
≥ 8 kW / 1.75 kW = 4.57
So a properly sized PHI battery bank based on maximum discharge would have a minimum of 5
batteries. This ensures no greater than C/2 battery load. If the PHI battery bank has fewer batteries than
calculated, special care must be taken with 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.