Neg loads - Solar and Engine chargers - 2024 R27NW

[DDean]

2024 R27 NW

It appears to me that the path for the negative loads from the solar charger and the engine alternator no longer attach direct to either of the house batteries, as per previous years. My '24 R27 house batteries have negative loads from the inverter, ground bus and the ACR, plus the negative bridges between the batteries (H-H-T), and that’s it.

I’ve looked a the schematics for 2024 and don’t see them. Are they on the ground bus?

Anyone know where the negative loads for the solar charger and the alternator have been moved to?

 

[DDean]

Closing this loop for future searchers:

Solar Controller negative goes to neg ground bus in port lazerette.

Engine negative goes to starter battery and recharges house when engine battery is topped up via ACR.

All as suspected - but I couldn’t find it anywhere in print!

 

[CruisingElvinRay]

All of your negatives for all the 12V systems should end up tied together (common ground). I have multiple negative bus bars in different locations, but that all end up connected together. This includes batteries, bus bars, etc.


Sent from my iPhone using Tapatalk

 

[DDean]

Has anyone else noticed differences between the wiring schematics in the Owners Manual for a 2024 R27 and the actual boat?

The owners manual shows that the neg from the solar controller goes to the house bank. It does not on my boat.
The owners manual does not show a neg (maybe a yellow 10) going to the thruster battery neg terminal, but there is one on my boat.

My smart shunt is missing the load from the solar controller somehow. I was guided by the electrician at the selling dealer that, if it’s not attached directly to the house as per the manual, it was probably attached to the house battery via the ground bus, which I believe I have properly connected. It appears that it’s not because my battery monitor is showing that I’m missing the solar charger. My SoC counts down with electrical use and charges up with shore power, but does not charge up with solar even with the house bank off. Voltage does however reflect solar inputs, solar is simply ignored in the SoC.

Interestingly, battery draw shows negative with all banks off and, while I’m guessing, it seems to be inversely proportional to the power solar might be putting in. Showing -70 watts with all banks off and mid sunny day. I suspect that positive from solar charger is on house but negative might actually be that mystery yellow on the thruster battery and that the system works because the thruster negative and house bank negative are connected but it’s bypassing the shunt.

Pulling that battery tray out and sliding it back into exact position was an experience I do not want to repeat (aligning the bolt holes was brutal with the three batteries on it). I’ll repeat if I have conviction that the mystery connection on the thruster is the solar charger (and I’ll move that to a bus that I have feeding the smart shunt), but I’d rather not experiment.

Questions:
1) has anyone found this same difference between the manual and actual?
2 if the positive for the solar charger was on the positive for the house bank and if the neg for the solar charger was on the thruster neg terminal, bypassing the shunt, would increased solar charge show as increased neg draw?
3) would what I have described result in voltage showing properly but State of Charge failing to capture solar inputs?

Many thanks! It’s a bit of a riddle!