PSS-G/RAID Alternative Energy System Deployment Guide
August 2020
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Solar Stik
®
Inc.
118
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Heat and System Derating
The function and efficiency of all electronic equipment is related to and dependent upon the
temperature at which it is operating. It performs optimally within a narrow temperature range and
less so as the temperature exceeds the upper end of that range. Solar panel output drops off
significantly in high heat as well. The Power Hub, PRO-Verter and Expander Paks generate heat as
a by-product of their normal function. Under normal circumstances, the amount of heat generated
in this way will not exceed the rated temperature of these components to function at their rated
capacity.
Causes of Overheating
The two (2) most common reasons for overheating are
high ambient temperature
and
solar
loading
(heat accumulation due to the sun shining directly the a component). These two factors
work together to elevate the internal operating temperature to the point where the internal
subcomponents of the PRO-Verter, Power Hub and Expander Paks may automatically derate or
even temporarily suspend operation to prevent damage to their internal electronics. The solar
chargers in the Power Hub are rated to operate normally up to 104 ºF (40 ºC), the PRO-Verter up
to 140 ºF (60 ºC) and the Expander Pak up to 149 ºF (65 ºC) Performance of the each of these
components will decline as the temperature increases or is sustained above this value.
Keep the System Cool
Thermostat-controlled, internal, cooling fans in the Power Hub and PRO-Verter turn on 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 the internal temperature does
not reach critical levels. Expander Paks do not have cooling fans and vents making it even more
important to keep them shaded to reduce solar loading.
Power Hub Overheating and Derating
The function and efficiency of all electronic equipment is related to and dependent upon the
temperature at which it is operating. It performs optimally within a narrow temperature range and
less so as the temperature falls outside of that range. The solar charge controllers within the Power
Hub are rated to perform at full capacity until the internal temperature reaches 104 ºF (40 ºC). At
this point, the charge controller will “derate”, or reduce its level of activity, to prevent the internal
temperature from rising further. When the internal temperature of the charge controller reaches
160 ºF (71 ºC) it will “shut down” to prevent damage. If this uncommon situation occurs, it is most
likely to happen during the hottest, sunniest part of the day when power from the PV arrays should
be producing power, but the report on the LCD user interface may say that they are producing no
power at all.
