In order to determine what your maximum VoC of an array can be, use one of the conservative estimate tables below or you can compute the temperature coefficients precisely if you have the solar panel specs.
Example 1
You might choose 0°C or 32°F as it almost never freezes in Georgia and the table shows 136.4v as your VoC maximum. The EcoFlow 400w portables have a VoC of 48.0v which means two solar panels in series have a VoC of 96v (Solar Rule #4 above)- well within the 136.4v limit. Three solar panels in series would exceed the 136.4v limit and result in black magic smoke.
Example 2
Since it gets really cold in Canada you would likely choose -40°C or -40°F and the table shows 48.0v as your VoC maximum at the coldest temperature. The EcoFlow 220w bifacial portables have a VoC of 21.8v which means you can safely put two solar panels in series (43.6v). Since the Delta 2 Max has two solar input XT60i ports, you can actually add four solar panels, two strands of two panels per port.
Published: September 20, 2023
Updated: