SimpliPhi ESS Battery Installation Manual

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3.2 – SimpliPHI Battery System Sizing
SimpliPHI Batteries are designed to operate at the continuous ratings specified in Table 1.0 – SimpliPHI
Battery Specifications. SimpliPHI Batteries with communications, when paired with an approved inverter will
enable proper settings for any size battery bank up to 72 battery modules. Settings also specified in Table 1.0
will be automatically communicated to the inverter. Battery bank sizes larger than 72 battery modules are not
supported since sufficient communications to the inverter and between the batteries cannot be achieved.
CAUTION: An SimpliPHI Battery bank cannot exceed 72 battery modules per bank. Sizing
SimpliPHI battery banks larger than 72 battery modules potentially causes damage to the
SimpliPHI batteries and Violates the terms of the Warranty.
3.2.1 – Sizing for All Systems
SimpliPHI Batteries in DC Coupled or AC Coupled Systems should be sized according to the
connected loads’ energy (kWh) and power (kW) requirements. While as few as one SimpliPHI Battery
may be paired with compatible equipment without voiding the battery warranty, consider that the
SimpliPHI Battery is rated according to the specifications listed in Table 1.0 above and that, without a
backup AC power source, loads that exceed the battery bank’s total capacity or power rating will result
in the entire system shutting down.
3.2.2 – Additional Sizing Considerations for AC Coupled Systems
In an AC Coupled system, significantly limiting the solar array’s charging power does not work well. In
addition, because the solar charging cycle in an AC coupled system will frequently have minimal absorb
time, the level of charge achievable with a full absorb is not equivalent to the battery’s 100% SoC. This
effect is less significant at slower charging rates. Therefore
, SimpliPhi recommends sizing a larger
battery bank relative to the AC Coupled PV array. In the below AC Coupling example, the batteries’
typical maximum continuous charge rate is multiplied by a de-rate factor of 0.8.
The charge calculation uses the nomenclature below:
Battery maximum continuous charge rate (kW
DC
) = Bat
kW
(typically @ C/2)
= (maximum battery charge current × battery voltage nominal)
PV charge maximum = PV
kW
Charge Example: 
#
≥


.×

AC Coupled Solar PV Array is rated at 8 kW
SimpliPHI 4.9 battery has a maximum continuous charge rate of 2.5 kW
DC

#
≥


.  × . 

= 
A properly sized SimpliPHI battery bank based on the maximum charge from the AC Coupled solar PV