question

2 comments,

you have to move the mppt's negative to the "system" side of the shunt.

move the temp sensor to 1 of the batteries positive post. better to keep an eye on 1 batteries temp, and hope the other matches, than measure the temp of a busbar.

Also, the fuse on the MPPT should be at the busbar not close to the MPPT. Fuses (and circuit breakers) are there to protect wiring from shorts. If you short the wire going to the MPPT it will most likely burn up. If you locate a fuse in that line at the bus bar then that fuse will blow.

If battery to bus bar connections are long, then fuse each battery for the same reason.

Many thanks to both of you for your sterling answers and suggestions; I have revamped my diagram to reflect the changes. Battery to bus bar connections are 50 cm / 20"

Best regards

Currently you only show two batteries, and only the inverter and the MPPT so it is the same number of connections on both sides of the shunt.

If you don't plan on future expansion, then you could eliminate the negative busbar and use the shunt as the connection point for batteries and loads. One or two connections to each post should be pretty easy.

For best current balance between batteries, also make sure the positive connections between battery and shunt are the same length and the negative connections between battery and shunt are the same length. It is not necessary to make the positive and negative lengths the same.

Busbars make it easier for more than one or two connections. So the positive busbar already makes sense.

Another simplification: jumper the two batteries to each other, then take the positive off one battery and the negative off the other. That keeps the current balanced between the two batteries. This only works with two batteries. Some people do more than two batteries this way but it's not possible to exactly balance currents to all batteries without a common point (busbar).

Thank you so much once again for your help I really appreciate it! Excellent idea regarding the negative busbar - I never would have thought of this.