I installed two SOK 12 volt 206 AH batteries on trays under my Roadtrek 190 RV in September 2021. I live in Pennsylvania, and so far, the various charge and BMS systems seem to be dealing with the cold below freezing weather just fine. My question involves battery capacity and locations, so some background detail is necessary. One battery is located on a factory installed tray up under the middle of the RV, and the second battery is located in a protected tray that I constructed in the space where a rear mounted factory installed Onan generator used to be. Out of necessity, the positive from each battery is connected to a frame mounted (and isolated) common positive connection point, rather than connecting the positive of one battery to the positive of the second battery, and then connecting the positive of the second battery to the common positive connection point. Four zero cable is used for the long run, and one zero cable is used everywhere else. The three sources of battery charging (solar MPPT controller, shore power charger, and RV alternator via a Victron DC-DC controller) also connect the positive of each device to the common positive connection point, as does a 3000 watt pure sine wave inverter. The significant one at a time loads on the inverter are a microwave oven, a toaster oven, a coffee maker, and an induction cooktop. While the inverter can power each device separately, the battery voltage appears to drop to 11.9 volts very quickly, like after just 10 minutes of continuous cooking, before I need to run the RV motor to recharge. I thought I would have more useful power with the two 206 AH batteries. I am planning to purchase a third SOK battery to improve my power situation, and the third battery will be mounted next to the second battery in the custom tray that replaced the generator. Now for the question. Because two of the batteries will be in the same location, I was planning to connect the positive of one battery to the positive of the other, and then connect the positive to the common connection point. I would connect the negative terminals and then connect the negative terminal (of the battery not connected to the common positive terminal) to the RV frame ground. This is the way I typically see RV batteries connected when all batteries are in the same location, and the method requires less cable. Is there any difference in available energy when each battery positive is connected directly to the common positive connection compared to connecting the positive of one battery to the positive of the battery next to it? Also, would it matter that two batteries would be connected as a pair and one distant one be connected via a separate cable to the common positive connection point? Roadtrek and my RV dealer have both voiced the opinion that either configuration should give the same end result. I also have a second question regarding charging batteries while using the inverter. My solar controller charges whenever the voltage drops. In the past, if we parked in a rest area to brew coffee, we would often leave the RV engine running to keep the air conditioning on and the batteries charging as we use them. My recently acquired pure sine wave inverter vendor recommends that the charging stop when the inverter is being used. Any thoughts regarding charging while using the inverter?