HyperVOC

On cold mornings the PV panels will put out full voltage even before you can see the
sun. Ambient light may not have much current behind it but it does have voltage
exceeding the possible voltage limits that destroy the controller. The fact that there is
no power behind the output voltage means that the controller will not be able to turn
on and drag the panels down from VOC to max power voltage.
The controller requires a few watts of power coming in from the PV panels to overcome
its internal power requirements. While the controller is waiting for enough power to
wake up, the PV array is at its highest output voltage. This is very dangerous if the
maximum operating voltage is exceeded.
The MidNite Solar controller gives you bonus headroom for those cold mornings that
would potentially destroy any other controller. We have advised thousands of custom-
ers to play it safe in conditions like our example above. MidNite has a unique character-
istic of the circuitry that allows it to go beyond the maximum operating voltage for
these conditions, it’s called HyperVOC.
Do not abuse the HyperVOC zone though. For example, let’s take a 150V Classic cong-
ured with 4 modules in series that have 36.9 VOC, 4 x 36.9 = 147.6. In Alberta with a
-32
0
C temperature, the max VOC will reach 181.54. This is well within the HyperVOC
zone on a 48V battery bank.
Wake up
Output Current
PV Voltage
Output Curren
Output Curren
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www.midnitesolar.com
Max Input Voltage
Non-Operative HyperVOC Zone
Temp: -32
o
C
OUTPUT
CURRENT
0 Amps
20 Amps
40 Amps
60 Amps
80 Amps
100 Amps
4 AM 5 AM 6 AM 7 AM 8 AM 9 AM
PV VOLTAGE
25V
0V
50V
75V
100V
125V
150V
175V
200V
Classic 150 Wake-up VOC
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ative HyperVOC
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6
AM
9AM
up
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