Here are two examples I just researched:

**Bluetti AC2000P **- blurb from a review by

Ben Gillmore. Even though the input limit from solar is 700 watts, this unit can apparently be "over-paneled" without the unit shutting down:

The AC200 MPPT charge controller has a solar input rating of 35-150v and 12a. It is rated to let up to 700w of solar go through it. The beauty of having such a large charge parameter is that it is capable of “over-paneling.” That means that I can install more than 700w of solar panels on the system to ensure I am getting the full 700w charge and that I can lengthen how many peak solar hours I get each day.

He can double the panel wattage to 1,400 watts, and get the full 700 watts into the generator for several more hours per day.

**EcoFlow Delta** - As I understand from various reviews of this unit, if the 400 watt max is exceeded by very much, say up to 420 watts, the system does not simply not allow more than 400 from entering the system, but the whole system kicks off and needs to be manually reset. So if you have 460 watts of panels so that you get around 390 watts during the best 4 hours of the day and the input happens to spike much beyond 400 watts, the unit will trip off and has to be manually reset.

Is the 700 vs. 400 watt max solar input, plus the over-paneling feature of the Bluetti plus a tripling of the number/cost of panels worth the extra $500 cost of the unit over the EcoFlow Delta. For my proposed use, probably not.

Thinking out loud, I would probably resort to Chrisski's method and see how close to maximum wattage input I can achieve with my initial panel array. If I'm still far short, I guess I could add another panel if I stay under the 65 volt and 400 watt max.

Can different wattage panels be placed in series?

Another downside of the

**EcoFlow Delta** is that the User Manual states that if non-EcoFlow panels are used, the warranty is void. And EcoFlow has only 110 and 160 watt panels. But they mention that 4, 110 watt panels can be attached in parallel for 440 specified watts, but likely high 300's in practice.

Technical Specifications for 110 watt panel:

110W Solar PanelRated Power: 110W(+/-5W)

*Open Circuit Voltage: 21.7V(Vmp 18.5V)

Short Circuit Current: 6.3A(Imp 6.0A)

Efficiency:21%-22%

Cell Type: Monocrystalline silicon

Connector type: MC4

Operating & Storage Temperature: -4° F to 185° F (-20° C to 85° C

With the 3, 110 watt panels that come with the EcoFlow system (rated total of 330 watts) I would probably get 300 watts, max., during the best 3 or 4 hours, and less than a 150 watts during the rest of daylight - not considering the potential for "partly cloudy." Not good. So 4 in parallel is the way to go.

**Is there such a thing as an external panel wattage input limiter that can be plugged in-between the panels and the generator?**