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19
December 2020
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Solar Stik
®
, Inc.
Operator and Maintenance Manual for the PRO-Verter S 3000
PRELIMINARY
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 Charge 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 power 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 the 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
the grid/generator at zero crossing of the voltage waveform for seamless transfer and for better
protection of transfer relay contacts.
Solar Charging and Solar Prioritization
Charging the HPS Expander Paks can be supplemented by connecting a PV array to the PRO-
Verter. The maximum PV current must not exceed
50 A
. The value of the PV current is displayed as
“EXTERNAL”, the bottom line of the user interface.
The net bulk charging current fed to the battery bank is as follows:
• Net Bulk Charging Current fed to the battery bank = Adjusted Bulk Charging Current from the
PRO-Verter c Current available from the PV array.
The measured value of the charging current received from the PV array is monitored by the control
circuitry of the PRO-Verter charger. The amount of bulk charging current produced by the internal
battery charger is adjusted in real time to satisfy the following condition:
• Internal Bulk Charging Current = Programmed Value of “Bulk Current” – External Charging
Current
For example, if “Bulk Current” in the PRO-Verter is programmed to 40 A and the PV array is
generating 15 A, the PRO-Verter charger will reduce its current from 40 A to 25 A so the net charging
current is equal to the programmed value of 40 A.