I do a considerable amount of mobile operations based on using golf cart deep cycle batteries (vented). These batteries are isolated from the automotive house battery via an isolator. While driving the output of the system does provide enough voltage to enable operations including a 500w amp. In a parked/idle state that is another story. I was trying to use the cars external battery bank for powering up an HF rig while camping. Didn't work very well as the voltage drop did not allow proper input to the HF rig without running a generator. I then tried a 1700w inverter that was close to the batteries and ran a extension cord out to a 30amp solid state power supply. I fully expected to hear a lot of noise due to the modified sine wave inverter but that was not the case. This combo actually worked and kept the input voltage to the HF rig at 13.9vdc. What did make noise was the laptop brick used to power up a laptop for digital operations. This is definitely not a "poor man's" solution to a boost regulator as the cost of the inverter and power supply most likely exceeds the cost of the booster. But it did work for me during generator quite hours (8pm at night till 10am the next morning). I am also experimenting with a Honda EU-2200i inverter inside of a baffle box made out of 3/4 plywood. I have cut down the generator noise in half without applying any sound absorbing/damping material. The box is a forced air design that exits the baffle box via a 4inch heavy duty dryer vent. Experimenting further, I found that an open cell foam (e.g. egg crate or felt) is not desired due to the fact that it restricts air flow, any fuel leaked is collected and holds the heat in. Maybe something like automotive dynamat or hushmat may be a better choice. I would like to hear comments toward some material to line the baffle boxes that does not cost hundreds of dollars (e.g. marine engine room dampening mat). Maybe something in the Butyl family? I also learned that I need two input fans to provide proper airflow. 1ea. fan 4.5"dia 3000rpm works but two would be better. Another side note is that the baffle boxes are designed to be taken apart for storage and transport. I have tried looking at the TGE N8XJK battery boosters but the site appears to be either down or has been redirected to external search engines vice a product line. The MFJ-4416C may work for just the HF rig but certainly not the amplifier. So for now at least the inverter and power supply solution is working for me as a interim for the HF rig only during the generator quite hours.