Hello,
based on some recommendations and a webinar from 2016 Victron published, I have reconsidered my project and think it is a better idea to have DC coupled batteries than AC coupled batteries ( I could be wrong again though).
There are other posts talking about DC vs AC coupled system. I don't know why it is often said that DC Coupled cannot be extended as much as AC coupled batteries. Anyway. my questions about the Victron
QUESTION 1:
Beyond the exact specs of the Smart Solar MPPT, I am wondering if I do need one per string or not. Also how good are there to start with very low voltage?
I have a situation with the Lower Roof SE. As you can see from the picture, The shade is created by the main part of my house and the shade travels from left to right on that roof.
I am planning to have the 3 panels oriented as per email illustration (2 portrait the 450W and one landscape the 600W)
in the morning
in the evening
The panel 2 will be the first one to be out of the shade in the morning and I want to make sure the SmartSolar or whatever I use will be able to start from that one panel. Even more than this. the panels are half cut cells with 3 diodes. Therefore as the 2 panel will be vertical, when the shade has travel a third of the width of the panel, the panel will start generating electricity. I originally planned to have Enphase microinverters for those panels but this will not allow me to have DC coupled batteries. Late in the evening this array will have the panel 1 having the longer the light.
Please let me know where I can confirm that the SmartSolar MPPT will be able to start with so low voltage.
QUESTION 2:
If the diagram is correct. where is the BMS and where do I control how I want to charge/discharge the battery (thinking about Agile, Flux, SEG and manually force charge/discharge). Regardless of the number of devices in parallel, can this be done from only one (the master)?
QUESTION 3:
Due to my requirements to have 7-8kW continuous charge/discharge, I understand that I can only achieve it by having 2 strings of batteries (running in parallel). I am looking at the Fogstar Rack 5.12kWh . Can the MultiPlus II support this or do I need two Mutliplus II? (actually this should be question 2 and question 2 the question 3).
Alternatively, can I have one string of batteries that will allow me to charge discharge at 7-8kW ? I have seen Solax and their Triple Power. These are HV Batteries but only work with Solax and you can only have a max of 3 batteries (15kWh) when you are on single phase as I am (or 6 2x3 if you use their BMS Parallel Box).
QUESTION 4:
As far as the DNO and G99/G100 is concerned, are there any differences between AC Coupled and DC Coupled batteries?
Thank you very much in anticipation.
based on some recommendations and a webinar from 2016 Victron published, I have reconsidered my project and think it is a better idea to have DC coupled batteries than AC coupled batteries ( I could be wrong again though).
There are other posts talking about DC vs AC coupled system. I don't know why it is often said that DC Coupled cannot be extended as much as AC coupled batteries. Anyway. my questions about the Victron
QUESTION 1:
Beyond the exact specs of the Smart Solar MPPT, I am wondering if I do need one per string or not. Also how good are there to start with very low voltage?
I have a situation with the Lower Roof SE. As you can see from the picture, The shade is created by the main part of my house and the shade travels from left to right on that roof.
I am planning to have the 3 panels oriented as per email illustration (2 portrait the 450W and one landscape the 600W)
in the morning
in the evening
The panel 2 will be the first one to be out of the shade in the morning and I want to make sure the SmartSolar or whatever I use will be able to start from that one panel. Even more than this. the panels are half cut cells with 3 diodes. Therefore as the 2 panel will be vertical, when the shade has travel a third of the width of the panel, the panel will start generating electricity. I originally planned to have Enphase microinverters for those panels but this will not allow me to have DC coupled batteries. Late in the evening this array will have the panel 1 having the longer the light.
Please let me know where I can confirm that the SmartSolar MPPT will be able to start with so low voltage.
QUESTION 2:
If the diagram is correct. where is the BMS and where do I control how I want to charge/discharge the battery (thinking about Agile, Flux, SEG and manually force charge/discharge). Regardless of the number of devices in parallel, can this be done from only one (the master)?
QUESTION 3:
Due to my requirements to have 7-8kW continuous charge/discharge, I understand that I can only achieve it by having 2 strings of batteries (running in parallel). I am looking at the Fogstar Rack 5.12kWh . Can the MultiPlus II support this or do I need two Mutliplus II? (actually this should be question 2 and question 2 the question 3).
Alternatively, can I have one string of batteries that will allow me to charge discharge at 7-8kW ? I have seen Solax and their Triple Power. These are HV Batteries but only work with Solax and you can only have a max of 3 batteries (15kWh) when you are on single phase as I am (or 6 2x3 if you use their BMS Parallel Box).
QUESTION 4:
As far as the DNO and G99/G100 is concerned, are there any differences between AC Coupled and DC Coupled batteries?
Thank you very much in anticipation.
