Outback Power Integration Guide

REV042920
SimpliPhi Power, Inc. | 3100 Camino Del Sol | Oxnard, CA 93030, USA | [phone] | [e-mail]| SimpliPhiPower.com
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Example B: Two PHI 3.8 kWh-25.6V
nominal
batteries (used in a 24-Volt system) must be paired with a 2,000-Watt
solar PV array wired to a 100 Amp-rated charge controller. In this case, the 2,000-Watt solar array is used to
determine the minimum PHI Battery quantity needed to prevent over-charging from the solar PV.
 =  × 
2,000     =  × 24 
2,000 
24 
= .   =      
83.3  < 100  → .   =       ℎℎ ℎ ℎ 
(
  ℎ 
)
÷
(
 ℎ   
)
=      ℎ
(
83.3
)
÷
(
45
)
= 1.85 →   
Refer to the Battery Bank Sizing for Maximum Instantaneous Charge Rate table below for a complete list of
OutBack charge controllers and the minimum quantity of PHI Batteries those controllers need to be paired with
to ensure that the PHI Battery bank does not over-charge (assuming that the charge controllers’ full current
output rating is utilized). Failing to do so will destroy the PHI batteries and Void the Warranty.
Sizing for Maximum Instantaneous Charge Rate
Assume the charge controller’s current output is fully utilized.
Minimum Battery Quantity
Charge Controller
Model
Max
Output
(ADC)
PHI 3.8
51.2V
PHI 2.9
51.2V
PHI 3.8
25.6V
PHI 2.9
25.6V
PHI 1.4
25.6V
PHI
730
25.6V
PHI 1.4
12.8V
PHI
730
12.8V
OutBack FM 100 / AFCI
100
3
4
3
3
4
8
3
4
3.3 – Sizing for Maximum Instantaneous Charge Rate (AC Coupled)
In an AC Coupled system, charge controllers do not regulate the PV solar array’s output, and many battery-based
inverters fail to effectively regulate the array’s output for battery charging. Therefore, in an AC Coupled system,
SimpliPhi assumes that all the connected PV array’s potential power output will charge the system’s batteries.
Determine the minimum quantity of PHI Batteries needed to prevent over-charge from the solar PV array by
dividing the solar array’s power rating by the MAX Continuous Charge Rate per PHI Battery (found on the
relevant battery’s specification sheet).
Example: Four PHI 3.8 kWh-51.2V
nominal
batteries must be paired with 7.6 kW of AC Coupled solar PV to ensure
the PHI Battery bank does not over-charge from the solar array.
(
7.6 
)
÷
(
1.92 
)
= 3.96 →   4
In addition to the Battery Bank Sizing requirements outlined above, also adhere to OutBack’s AC Coupling
Guidelines and system sizing considerations.
• AC Coupling with the Radian:
http://www.outbackpower.com/downloads/documents/appnotes/ac_coupling_radian.pdf
• AC Coupling with the SkyBox:
http://www.outbackpower.com/downloads/documents/appnotes/ac_coupling_skybox.pdf