the_german
New Member
- Joined
- Apr 20, 2022
- Messages
- 7
Hello community.
I was away for a long time and a few weeks ago I swapped my 3x Axpert 7200 for a Deye 12kw 3-phase hybrid inverter, which I want to use as an island system with a network bypass via the generator input. Netzparallel is not possible for legal reasons.
Technically, I largely understand how to install the device, but the 2+1 MPPT confuses me.
So far I had 6 MPPTs from the 3 devices and the modules were relatively evenly distributed across all MPPTs. The fact that the 6 areas do not all receive full sun at the same time or are shaded differently was a very useful solution.
To make it easier for those reading along, I'll include the values of my PV modules and the values of the inverter.
Max power 230w +/-3%
Max voltage 29.7V
Max current 7.75A
Open circuit voltage 37.2V
Short circuit current 8.3A
I have 46 modules spread over 3 roofs
18x PV field 1 (2x9)
14x PV field 2 (2x7)
14x PV field 3 (2x7)
I can change the fields to 1x18,14,14 without much effort.
The DEYE can handle a maximum of 15600W, which I can't reach because the modules are already 15 years old and together they would only be 13600W.
The MPPT range is 200V-650V (start voltage 160V)
MPPT1 has 2 inputs with a total of 26A (34A Max.PV ISC)
MPPT2 has 1 input with 13A (17A Max.PV ISC)
My question is. Can I use MPPT1 (2 inputs) with 2 different voltages, e.g. use 14 and 18 modules or does the voltage have to be approximately the same? And how will the MPPT behave because each of the 3 possible fields is in the sun or is shaded at different times.
I would be grateful for a few suggestions.
I was away for a long time and a few weeks ago I swapped my 3x Axpert 7200 for a Deye 12kw 3-phase hybrid inverter, which I want to use as an island system with a network bypass via the generator input. Netzparallel is not possible for legal reasons.
Technically, I largely understand how to install the device, but the 2+1 MPPT confuses me.
So far I had 6 MPPTs from the 3 devices and the modules were relatively evenly distributed across all MPPTs. The fact that the 6 areas do not all receive full sun at the same time or are shaded differently was a very useful solution.
To make it easier for those reading along, I'll include the values of my PV modules and the values of the inverter.
Max power 230w +/-3%
Max voltage 29.7V
Max current 7.75A
Open circuit voltage 37.2V
Short circuit current 8.3A
I have 46 modules spread over 3 roofs
18x PV field 1 (2x9)
14x PV field 2 (2x7)
14x PV field 3 (2x7)
I can change the fields to 1x18,14,14 without much effort.
The DEYE can handle a maximum of 15600W, which I can't reach because the modules are already 15 years old and together they would only be 13600W.
The MPPT range is 200V-650V (start voltage 160V)
MPPT1 has 2 inputs with a total of 26A (34A Max.PV ISC)
MPPT2 has 1 input with 13A (17A Max.PV ISC)
My question is. Can I use MPPT1 (2 inputs) with 2 different voltages, e.g. use 14 and 18 modules or does the voltage have to be approximately the same? And how will the MPPT behave because each of the 3 possible fields is in the sun or is shaded at different times.
I would be grateful for a few suggestions.