February 2020
|
Solar Stik
®
, Inc.
20
|
System Setup and Operation Manual for ATSC MS3 L0
Lag Time and Surge Rates
The PRO-Verter’s inverter function can provide up to 130% of its rated power output for brief surges
that may be required to support a load. Most generators are also rated to support brief surge loads.
A PRO-Verter should be paired with an appropriately rated generator, but if it is paired with a smaller
generator, the AC INPUT setting must be set to limit the AC power the PRO-Verter will expect from
the AC source. In this scenario, it is possible for the PRO-Verter to put up to 130% load on the AC
source (generator or grid utility), which can occur when charging mode is engaged and a sudden AC
surge is demanded by the load. Since the PRO-Verter can’t determine in advance how much power
will be demanded at the time of the surge, it can only “react” to the surge condition. It may take up
to 1 full second for the PRO-Verter to react, and this period is known as “lag time”. Lag time results
in 130% of the AC INPUT setting being demanded from a generator for up to 1 second.
If the generator can’t handle 130% surge, it will likely crash the System in the following ways:
• The generator AC output voltage may drop below the VAC DROPOUT setting in the PRO-Verter.
• The generator AC contactor (if present) or circuit breaker may open, causing a loss of AC at the
PRO-Verter.
• If the generator has an electronic protection circuit, it may cause the unit to shut down entirely.
All of these issues are resolved by dropping the AC INPUT setting less than 130% of the output
rating of the connected AC source.
Figure 3. Hybrid Power System in Operation
