Question on shunt

The Renogy Shunt should have come with its own LCD Display/Controller.

https://www.renogy.com/500a-battery-monitor-with-shunt/

The shunt connects directly to the battery negative (-) terminal... The other side of the shunt is where your charge controller(s), DC loads, DC input to AC inverter, etc. are connected:


You you can see, the Positive Bus Bar and Negative Bus bar are where all of the rest of the DC electrical connections. There is no specific connection between the Shunt+LCD display and either charge controller.

Not sure what you mean with "The 40 amp will be hooked up in parallel and the 100 amp will be in series."

If you are talking about solar panels in series and/or parallel... Need to know exactly what charge controllers, what solar panel Vmp/Imp ratings, and battery bank voltage (12/24/48 volts).

Details do matter here.

-Bill

The "Bus Bars" can be just a long bolt and nut with a bunch of terminal ends bolted together--A flattened copper water pipe with bolt holes, etc... Nothing special about Bus Bars other than a handy single place to connect the wiring (and fuses/circuit breakers to protect + wiring to loads).

The diagrams show that there is no difference how many sources and loads you have for the "shunt" connection. Just connect B- to Battery negative, and P- to All Other Loads/Sources so that the shunt measures all current into/out of the battery. If you were to connect a load/source between B- and Battery-, that current flow would be "invisible" to the shunt. Which then prevents the shunt+display for accurately displaying the battery current flow/state of charge/etc.

I cannot really help you with the panel/array wiring without knowing exactly which solar charge controller(s) you have. PWM controllers (simple, cheap) require Vmp-array to "match" battery bank voltage (i.e., Vmp-array ~ 18 volts charging a 12 volt battery bank or Vmp-array = 2x 18 Vbatt-charge = 36 corrected BB volts Vmp-array-std minimum/optimal).

MPPT controllers (more sophisticated/expensive are much more flexible. More or less, you can connect Vmp-array~18 volts to a Vbatt of 12 volts... But ideally, the Vmp-array should be ~2x the battery bank charging voltage--2x 15 volt battery charging = 30 volts minimum/optimum for Vmp-array...

And for MPPT, there is a Vpanel-max input voltage... These can run from 80 to 100 to 150 to 400+ volts... Although for most MPPT controllers Vmp-array = 2x battery charging voltage is "most efficient" for MPPT controller. There are other reasons to have Vmp-array >> 2x Vbatt-charging. Basically P=V*I, double the voltage, 1/2 the current, and 1/2 the voltage drop... If you have more than 10-20 feet or so between Array and charge controller, then having high Vmp-array lets you use much smaller AWG copper cable--And you can save lots of money by using less copper for the wire run.

Details matter here... Most controller manuals are pretty clear about Array Wiring options.

You also need to worry about cold weather. Voc (voltage open circuit and Vmp voltage maximum power point) rise in cold weather. If you ar in a subfreezing/bitter cold area, a 150 Amp charge controller should be connected to a Vmp-array that 0.7x Vpanel-max (150 Vmax * 0.7 = ~105 Vmp-std array--Pretty much "worst case cold weather design estimate).

You where around Oklahoma (?) so not in bitter cold, but do be careful not to have too high of Voc-array-cold does not over-voltage the charge controller.

Details matter here. Do paper designs... And follow each design/validation step.

-Bill