|> So you are a dealer of very large cells/batteries. | | No longer. Today the only solar work I do is helping people fix the | problems caused by poor design. |>
|> | I can only repeat what I learned getting my accreditation. That was |> | many years ago and I am sorry that I no longer have the notes to show |> | you. |> | |> | The science says that parallel strings do not charge and discharge |> | equally. Parallel strings should be avoided where ever possible and GC |> | batteries belong in a golf cart. |>
|> That's not science. Science would tell you why and how that happens. |> Further, science would tell you how they behave under various methods |> of connecting charging and discharging circuits. | | The science is that cells all have different internal resistances.
I guess you don't have an EE degree.
Not that I have one, either. But I respect the knowledge AND understanding real engineers need to have. The information I seek is what would be learned in an Electrical Engineering, Power Elective, curriculum (not all of it, of course ... just the parts I'm interested in right now).
|> You're taking the training you've been giving regarding certain finite |> methods to install battery systems, and calling it "science". Real |> science comes from research laboratories and investigative processes |> that explore all options and find out why things really happen and how |> control methods may or may not work. | | As you wish, but, all the systems I designed using my training have | worked to spec.
Are you talking about true design, or just mere deployment configuration?
Bob needs twice the capacity as Carl, so you install a system for Bob that has a string of cells twice as big as those you installed for Carl, that's NOT "design". That's "configuration". You select a design (one single string) and you select a capacity based on available models.
Configuration is when you select from existing known designs. Have you ever installed a system which was wired different than _any_ example you ever saw before?
|> | If you want to use them, fine. But in the long run you will say, "That |> | bastard was right". |> | |> | The tests were done at Royal Melbourne Institute of Technology in |> | Melbourne. The test was done on a rig of six parallel strings of six |> | two volt cells. They tried all the tricks like isolating the strings |> | with diodes and fancy interconnecting of cells. The results were |> | always much the same. Unbalanced charging across the array. |>
|> What kinds of chargers did they use? Did they have separate chargers for |> each string? | | Shit, that was close to twenty years ago. Battery technology has not | changed much since.
But you didn't want to answer my question. Don't worry, you are under no obligation to answer it. And, besides, this is Usenet. Most questions go unanswered, anyway.