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1.5.2 Backup Solar plus Storage

During  a  grid  outage,  the  Evolve  Hub  islands  the  battery  system  and
backup  electrical  panel  off  the  grid.    In  this  mode,  the  EMC  is  in  a
monitoring state, with most control handed over to the Evolve ESS.  The
Evolve  ESS  curtails  PV  when  the  battery  is  either  full  or  exceeds  the
charge limit of the battery.  On low SOC, the battery system goes into a
standby state until either the solar resource or the grid returns.

IMPORTANT!

Shutting off the Evolve Hub circuit breaker at the main

electrical panel will place the ESS into backup mode and continue to
energize the backup panel.

1.5.3 Backup Solar PV curtailment method: Frequency Shift Power Control (FSPC)

During backup power operation of the Evolve ESS, PV curtailment is achieved by shifting the frequency up or down to trip
the PV inverter. This curtailment method, defined as frequency shift power control (FSPC), is required to prevent solar from
over-charging the battery. By default, the Evolve ESS will ramp up frequency to a PV trip range of 62.1 Hz, but this is
adjustable depending on the regulatory frequency trip limits within the jurisdiction.

IMPORTANT!

PV inverters connected to the backup panel must have frequency trip settings programmed within the

following ranges: PV low frequency trip range: 57.0 to 59.3 Hz, PV high frequency trip range: 60.5 to 62.0 Hz.
If the PV inverter cannot be adjusted within the range specified, the PV inverter must not be connected to the backup panel.

Note:

The Evolve Hub is not suitable for use in applications where the electric utility prohibits PV power export to the grid.

For non-export applications, consult your Eguana dealer for alternate EMS panel solutions.

1.5.4 Circuit and system sizing for 100 / 125 / 150 Amp electrical panels

Line side tapping the main electrical panel is required for ESS installations where the electrical service rating is under 200
Amp. Refer to section 2.3, figure 11.

1.5.5 Circuit and system sizing for 200+ Amp electrical panels

The Evolve Hub may be connected to a 200+ Amp electrical panel using a single 40A breaker.  For this configuration, the
total solar PV output connected to the backup electrical panel will depend on the curtailment features of the solar PV inverter.
If the PV inverter is equipped with its own curtailment controls that can limit PV output to 5kW or less in backup mode, the
maximum rating of the PV inverter connected to the Evolve hub is 7.6 kW AC.  For PV inverters without internal curtailment
methods, the 5 kW PV restriction applies.   Regardless of PV size, this configuration permits the Evolve Hub’s EMS to limit
continuous combined solar plus storage output to 7.6 kW AC (32 Amp).

1.5.6 Over-sized PV systems

For installations with PV systems that are larger
than the Evolve Hub and Evolve ESS can
accommodate, the PV inverters must be split up
such that the balance of PV is wired directly to the
main electrical panel.

An additional CT must be added to the main
panel connected PV inverter.

Solar

Inverter

Evolve

Hub

Evolve

ESS

Load

Home loads

Backup

Electrical

Panel

Solar