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27
October 2019
24VDC Power Hub 2500 Operator Manual
Heat and Derating
The function and efficiency of all electronic equipment is related to and dependent upon the
temperature at which it is operating. All equipment performs optimally within a narrow temperature
range and less so as the temperature exceeds the upper end of that range. PV panel output drops
off significantly in high heat as well. The Power Hub generates heat as a by-product of processing
incoming PV power. Under normal circumstances, the amount of heat generated in this way will not
exceed the rated temperature for the Power Hub to function at its rated capacity.
Causes of Overheating
The two (2) most common reasons for the Power Hub to overheat are high ambient temperature
and solar loading (heat accumulation due to the sun shining directly the Power Hub). These two
factors work together to elevate the internal operating temperature to the point where the solar
chargers may automatically derate or even temporarily suspend output to prevent damage to
their internal electronics. The solar chargers are rated to provide full power up to 104 ºF (40 ºC).
Performance of the Power Hub will decline (charging current reduced) as the temperature increases
or is sustained above this value.
Note:
The charging current reported by the Power Hub battery monitor will also approach zero
(0) A as the batteries approach a fully-charged state.
DEVICE LIST
Battery Monitor
Time
100% 0.0A
0.0W
Solar Charger #1
Solar Charger #2
Solar Charger #3
>
>
>
>
Battery Monitor
Battery
Time
26.33 V 0.0A
0.0W
State of charge
Temperature
Starter voltage
Consumed AmpHours
Time-to-go
Relay state
100%
0.01V
0.0Ah
--
Off
75 ºF
Figure 22. Power Hub internal temperature report on user interface
Power Hub Internal Cooling
Thermostat-controlled, internal cooling fans turn on at ~104 ºF (40 ºC) to maintain the internal
temperature within the optimal operating range. The fans are audible when operating. Clogged
air intake filters can significantly exacerbate heat-related problems, so they should be cleaned as
often as necessary to maintain maximum airflow.
Clean or replace the air filter
monthly, or more
frequently if operating in very dusty environments. Do not operate the Power Hub in direct sunlight
or directly on the ground. It should be placed in a shaded, well-ventilated location. Proper air filter
maintenance and shading the Power Hub will help to ensure that the internal temperature does not
reach critical levels.
Power Hub Internal Temperature Report
The Power Hub has a sensor that measures and reports the internal temperature. The internal
temperature of the Power Hub (NOT the batteries) is reported in the Battery Monitor menu page. To
access this and other battery-related data, press the Menu button to show the device list. Select/
highlight “Battery Monitor” and either right-click or press the Select button to display.
