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IMPORTANT:
Respecting the Voc limit is very important. Never exceed the maximum Voc voltage of 450V.
A general rule is 0.6 V Per cell Voc. However, the user should be aware that some of the newer
technologies may have higher voltages.
Do not rely on your multimeter to work out the Voc. You must also check the solar panel ratings. By all
means, double-check with your meter.
If there is no sunshine, then you may get a false reading. Also, pay attention to cold weather conditions
because the Voc can increase dramatically. Again, please check with the solar panel manufacturer on the
performance in very cold weather, especially below zero. Warmer weather is less of a problem as panels give
less power when hot.
WARNING:
If the voltage is too high on the MPPT, you can burn out the front-end. DC to DC converter damage also
invalidates your warranty.
Keep your Voc below 450V. Regardless of the power of the solar panel, the inverter will only draw what it
needs (basic ohms law). Please refer to our training manual part one.
When wiring to string-inverters in parallel, please make sure the string inverters have identical power,
identical size, and identical manufacturer. Do not mix panels if one string is only eight panels and the other
nine. This will create an imbalance and cause major efficiency losses. However, you can mix panels between
the MPPTs since both inputs work independently.
A common question often asked is: ‘I have a lot of solar panels and the sun is shining, my the array is not
producing much power?’ To produce power, you must have to use the power that is being produced. If you
are not using the power, then they will simply not produce anything.
In this circumstance, check if your battery is full and the usage is minimal. Unless you switch the power
to the smart load or export the power, it will simply be lost, and you will not be producing any energy from
your solar array. Refer to Aux Load output section.
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