They should be able to deliver mostly populated PCBs. There is a general parts shortage for a few components but there are other sources for them and for the most part they are not too challenging to solder by hand with ~22AWG solder (under 1mm diameter) and a bit of solder wick to pick up any extra solder. Solder paste works as well but will also require solder wick for excess.
Did someone already replaced the RS-485 chip SN65HVD75DR by a MAX3485ESA ?
As far I can see they are pin identical and have compatible electrical specs.
Hover TI claims 20mbps and Maxim only 10mbps.
I cannot get hold on the TI chip, this is the only one missing.
However obtaining IC’s of the shunt design are next level…
I agree they look near identical and very likely will work fine. The difference in maximum data rate is not super critical since the shunt and controller both operate at 19200 today and most other RS485 devices are either 115200 (EPSolar/EPEver) or 9600 (many other inexpensive devices).
C57928. LCSC has nearly 7000 available to ship within a couple days. I highly recommend submitting a batch order with all parts you will need for the controller and shunt if you are opting for both, this will save on shipping costs.
I ordered boards from JLCPCB and had them assembled, there are a couple part swaps necessary (capacitors) as JLCPCB often has stock issues and there are often a few components that can be swapped.
INA228AIDGST - Order direct from TI, most other suppliers seem to be out of stock.
These are the links which I’ve used for sourcing parts for the shunt that were not available from Mouser/DigiKey/LCSC. I was hesitant to order them on AliExpress but I’ve had luck with these suppliers in the past and have been using the above linked parts in the shunt PCBs that I’ve assembled (still have a couple available in the USA).
I’ve tested IFX1050GVIOXUMA1 and can confirm it is a drop in replacement, but it is not available in most places. I have a supply of them on hand as well as TJA1057GT/3 since I use them for other projects as well.
I think you mean D2 instead of D1 for the modules. However, it looks like C10204 should be a suitable drop in replacement. I don’t find any reference to FDS6690A on the module or controller PCBs.
You are right though, it is D2 in the stock 4.4 module (for some reason swapped # with D1 in the LISHEN…) I notice the one is 6V and the one you suggest is 5V. Not sure why the larger one was specified, obviously with LifePO4 cells up to 3.6something V the 5V is plenty, so sorted that, thanks!
re the Q1 it looks like it’s larger (also in footprint to the one used on Stuart’s stock design) Will study a bit more before choosing an alternative stocked by JLC!
The usage of a slightly higher voltage reverse current diode is usually ok in this case. There are a few options on how to handle reverse current protection, this being one of the simplest. I use a slightly more complex one using a P-Channel MOSFET, there are even designs using an IC out there.
no idea, haven’t (and possibly cannot!) examine the operation of this part.
Thought it was used as a switch to enable/disable balancing, am I missing something I wonder!