I have a solar inverter that's rated for a maximum input capacity of 150 volts, 12 amps, and 1,200 watts. I'm planning to add four 250-watt Trina solar panels to my setup. Each panel has a Voc of 37.8 volts, which will give me a total of 151.2 volts if I connect them in series. That's just 1.2 volts over my inverter's limit. Is this a problem, or is there some leeway I can work with when it comes to the voltage rating?
3 Answers
The voltage limit is pretty strict—you can't exceed that hard limit, or you risk damaging your inverter. However, exceeding wattage isn't usually a problem. Just keep the voltage in check!
I’m no expert, but remember that temperature also plays a role. In cooler weather, panels can output more than their rated voltage, so keep that in mind as well!
It's generally advised not to exceed the maximum Voc of your inverter. You really should aim to have a buffer, especially in colder temperatures, since MPPTs often go into overvoltage protection if you get too close to the max. If possible, consider using different panels that fit better within the voltage limits, or if you're using both inputs on your inverter, try splitting up the panels.