ECOFlOW DELTA PRO SOLAR EAST / WEST DESIGN 12/16/23

[sustainableengineer]

Design specification for review.

ECOFlow Delta Pro(s)
(2) ECOFlow Delta Pros with battery extension
(2) ECOFLow Battey Extension
(1) ECOFLow Double Voltage Hub
(1) ECOFlow Transfer Switch
Charging inputs: 120VAC and D.C. Solar
Solar Panels
12 total 300W panels, 6 for each ECOFlow Delta Pro’s A and B See diagram

ECOFlow A and array A
ECOFlow A has an array of two strings on an east-west roof, with a string of three series panels and another series string connected in parallel. 3S + 3S connected in parallel.
32.5 vdc x 3 = 97.5 vdc
9.85 dc amps x 2 = 19.7 dc amps
Total over-paneled wattage of 1900 watts. (Due to losses, panel placement, solar irradiance, and efficiencies, this over-paneling should be fine.)
See diagram

ECOFlow B and Array B
ECOFlow B has an array of two strings on an east-west roof, with a string of three series panels and another series string connected in parallel. 3S + 3S connected in parallel.
32.5 vdc x 3 = 97.5 vdc
9.85 dc amps x 2 = 19.7 dc amps
Total over-paneled wattage of 1900 watts. Due to losses, panel placement, solar irradiance,
32.5 vdc x 3 = 97.5 vdc
9.85 dc amps x 2 = 19.7 dc amps
Total over-paneled wattage of 1900 watts
See diagram

Questions:
In an ECOFlow combined configuration, how do the batteries from each balance out?
Can the A.C. output be fed back into the A.C. charge input?
Will this help to balance the battery charge level between the two units?
The series/parallel combined solar array configuration ensures maximum solar power for the inputs of the ECOFlows.
See diagram

 

[Crowz]

If they are two separate systems what balancing is needed? Or am I not understanding this one.

 

[Dr Nerd]

Design specification for review.

ECOFlow A and array A
ECOFlow A has an array of two strings on an east-west roof, with a string of three series panels and another series string connected in parallel. 3S + 3S connected in parallel.
32.5 vdc x 3 = 97.5 vdc
9.85 dc amps x 2 = 19.7 dc amps
Total over-paneled wattage of 1900 watts. (Due to losses, panel placement, solar irradiance, and efficiencies, this over-paneling should be fine.)
See diagram

I'm thinking the DP only see or can use 15 amps so you probably only getting maybe peak of 1462 watts. It's hard to get the full 1600 watts from a DP because of the 150v limit.