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19
June 2020
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Solar Stik
®
, Inc.
SYSTEM SETUP AND OPERATION GUDIE FOR THE 1 kW HYBRID POWER SYSTEM (HPS)
PRELIMINARY DRAFT
to defer the load (via the transfer switch) onto the external source, which will cause the inverter
circuit to go into standby mode. In standby mode, the inverter circuit is not actively providing power
from the batteries to the loads, rather, the loads connected to the inverter are powered directly
using the external AC power (pass-through power). However, if power from the external AC source
is interrupted, the inverter senses these conditions and immediately starts inverting to maintain AC
output to the loads.
Transfer of Loads From Grid / Generator Input to Inverter (Batteries)
When the PRO-Verter is operating in “Charging Mode”, the phase and frequency of AC input power
are tracked continuously. If AC input power fails or is disconnected, the load will be transferred,
within 16 ms, to the inverter at the same phase and frequency as the AC input power that was
disconnected.
Transfer of Loads From Inverter (Batteries) to Grid / Generator
When Grid / Generator becomes available, its voltage and frequency are checked to determine
if they are within the programmed limits. If so, the output voltage of the Inverter is synchronized
with Grid / Generator through “Phase Locked Loop” (PLL). This synchronization process takes few
seconds. Once synchronization is completed, the load is transferred instantly (within 1 ms) to Grid /
Generator at Zero Crossing of the voltage waveform, for seamless transfer and for better protection
of Transfer Relay contacts.
PV Charging Management
Charging the System Expander Paks can be supplemented by connecting a PV array(s) to the
PRO-Verter. The value of the PV current is displayed as “EXTERNAL”, the bottom line of the User
Interface.
The PRO-Verter S 2000 can be programmed to manage PV power in either one of two ways:
1. Incoming PV power can “replace” or offset some generator power. For example, if “Bulk Current”
is programmed to 20 A and the PV array is generating 15A, the PRO-Verter charger will reduce
its current from 20 A to 5 A so the net charging current is equal to the programmed, maxiumum
value of 20A
2. Incoming PV power can be “added” to generator power. For example, if the “Bulk Current” is
programmed to 20 A and the PV array is generating 15A, the PRO-Verter charger will combine
the currents 20 A and 15 A so the net charging current is 35 A, exceeding the programmed,
maxiumum charging value of 20A.
Note
: When managing PV power using method #2, do not exceed the maximum combined rated
charging current of the batteries in the bank.
