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9
April 2021
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Solar Stik
®
, Inc.
PRELIMINARY DRAFT
24VDC HyPR 3000 Operator and Maintenance Manual
DC Functions
The DC bus is effectively the nervous system of the HyPR. All HyPR functions are regulated directly
or indirectly by the DC bus voltage. The DC bus voltage is functionally equivalent to the System
battery voltage. Direct connections to the DC bus can be made via the two (2) Inter-Connect ports
and the NATO port. Ports for PV, the scavenger circuit, AC Input and AC output ports are indirect
connections to the DC bus (See “Figure 1. Schematized power flow from a top-down view of the
interior of the HyPR 3000” on page 7).
DC power will flow into or out of the HyPR via the direct connections (Inter-Connect and NATO
ports).
The indirect connections allow power to flow to the bus after being altered from its original form, for
example:
• 30-57 VDC power from PV arrays converted by the solar charge controller to 29.0 VDC
• 9-36 VDC scavenged power converted to 28.4 VDC
• AC power converted to 28.2 VDC
• Inverter converts energy stored in batteries to 120 VAC power output.
Utilization of power sources to charge batteries and support loads is prioritized by voltage.
Prioritizing PV and scavenged DC power over AC power reduces reliance on fuel-powered
generators.
Solar Power
The SOLAR INPUT port is the only port that may be used to connect PV power to the HyPR.
Connecting a PV array to any other input port will damage to the HyPR.
Any PV array input must meet the following specifications: 400 W or less, voltage between 30 and 57
VDC, and a maximum current rating of 15 A at 24 VDC.
The HyPR converts incoming PV power to a 29.0 VDC charging current. When multiple power inputs
are present, 29.0 VDC PV power is automatically prioritized for battery charging.
When a PV array is present, all features of the HyPR DC INTERFACE are available. If PV power is not
an integral part of a HyPR 3000-based System, only the voltage and current metrics on the home
screen are accurate while the System is operating.
Power Scavenging
Scavenged power is converted to 28.4 VDC charging voltage placing it second, after PV power,
in the rank order of prioritization of power sources. Therefore if PV power is present, scavenged
sources may not contribute to the charging current on the bus.
The scavenged power source must be able to provide at least 250 W of power. Total Internal power
consumption of the HyPR is ~100 W. If passing power through to a load when in Scavenge mode,
then only about 150 W will be available for use.
