NRG Instructions
SRA System | All-Weather PVH Kit
SRA_All-Weather_PVH_Kit_Instructions
Rev. 5.0
support@nrgsystems.com | Page 29
18 April 2018
Press ESC.
Use the up and down arrows to select the RUN menu.
Press OK.
The screen will show YES and NO for options.
Select YES and press OK.
The menu will no longer show RUN as an option. Instead it will show STOP. The PLC is now
running its program.
6.3 Understanding the NRG Default Control Algorithm (PLC)
The battery bank and PV sizing follows the expected climate conditions for a particular site.
Kit 11708: (1) 60W PV panel; (1) deep-cycle battery. Optimized for sites that experience dust
and dew accumulation.
Kit 11709: (2) 60W PV panels; (2) deep-cycle batteries. Optimized for sites with minor snow
accumulation.
Kit 11710: (3) 60W PV panels; (3) deep-cycle batteries. Optimized for sites where snow
accumulates and ice builds up.
The 3 PVH Kit options contain a PLC preloaded with a control algorithm which works as follows:
Heater turns on 6 AM to 8 AM
Heater turns on between 8 AM and 8 PM when ambient temperature is below 3
C
Heater turns off between 8 AM and 8 PM when ambient temperature is above 5
C
Ventilator turns on between 6 AM and 8 PM (14 hours/day)
Heater operation times and temperatures are user-adjustable, if desired. Ventilator operation times are
user-adjustable up to 24-hours (continuous operation).
For kits 11709 and 11710, the system will require the heater to be connected. For kit 11708, the user
should disconnect the heater leads to ensure adequate power for the ventilator.
6.4 How to Configure the Controller for Kit 11708
When using kit 11708, disconnect the heater to ensure adequate power reserves. To accomplish this,
disconnect the heater wires from the Q1 and Q2 terminals of the PLC. No modification of the PLC
program is necessary.
