Magnum Energy Integration Guide

REV070219
SimpliPhi Power, Inc. | 3100 Camino Del Sol | Oxnard, CA 93030, USA | [phone] | [e-mail] | SimpliPhiPower.com
| 5 |
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