Stay below the maximum voltage specs of the solar generator
Stay way below the maximum voltage specs when it gets cold (how far below will be discussed later)
You can exceed the amperage specs
In series, volts add
In parallel, amps add
With mixed solar panels, the lowest amps in series prevails
With mixed solar panels, lowest volts in parallel strands prevails
We cannot stress #1 and #2 enough so it is worth repeating - do not exceed the volts
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.
Examples
Example 1
Live in Georgia
Own a Delta Pro
Using EcoFlow 400w portable solar panels
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
Live in Canada
Own a Delta 2 Max
Using EcoFlow 220w bifacial solar panels
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.