so I wana make it a flat layout so 10cells wide by 5 cells high, and I want to sandwich that between two pieces of ABS plastic for rigidity (or at least hot glued to one) then shrink wrap that then mount the BMS/Booster on top of the ABS with its own shrink wrapping.
gotta play with it though, but that’s whats in my head.
@DerelictRobot the solar charge controller PCB sleeps on in storage. For now, golf cart style 48v to 12v step downs does the conversion work to make a decent 12v output.
Thanks @Fosterqc i was already planning to convert my backpack into a mobile charge station and this thread was super helpful! Ill be going back here for more info many many times.
My plan is to have a dc-dc converter, or maybe a few if need be, with an xt90 input and several outputs at varying amps with all the common charge ports and maybe a usb and a type c output as well, built into one or more boxes spread around and sewed into my pack. Then, i can use most packs as a backpack range extension, plus charge other devices on the fly, or make adapters for any batteries i cant use… it just sounds great to have a mobile electron directing station. And when my mtb is done i can just detach its peli case and throw it in my bag to extend my street boards range. Theres no downside.
Voltage matching. when connecting two different battery pack together, you have to make sure they have very close voltage level, if you conncect two battery that has big difference in voltage , a surge of current will flow between the two packs and damaging your BMS in side the original battery. The PMS inside GT40 does voltage matching automatically by comparing the internal and external battery level 600 times per minute, and it decide wether it is safe to feed power into your board, if it is safe, the PMS will establish a connection between the external and internal battery pack by turning on a high speed switch inside, and showing a flashing green light on the indicator. If the voltage of your board is below safe limits, the PMS will show a blue light and you can connect your board to the charger until the PMS turns green. If the voltage of your board exceeds the safe limits, the PMS will show a red light, you can go out and ride your board with GT40 connected and the PMS will automatically establish the connection once the board is within safe limits.
This sounds awesome! It would mean never having to worry about your batteries being at unequal voltages when connecting them in case you forgot to charge one / your BMS messed up. And because it doesn’t do any voltage converting, the PCB doesn’t take up much space or power.
Anyone know if there are ready-made solutions for this that we could use? Build an external pack, add a module like this to the output – boom! Smart external range pack! Or do we have to ask someone like @SimosMCmuffin to design one for our needs?