You may want to consider replacing the stock alternator with a high output unit. I started running into trouble when I swapped out the Renogy 20A DC-DC for a 40A, same brand. At idle, the Renogy was only providing around 25 amps and the TV battery was not being properly maintained. When using the A/C via inverter during brief stops, I generally keep the TV running so the DC-DC can augment the power consumption of the A/C; this has proven to be detrimental to the vehicles charging system! Also, I have issue in stop and go traffic when transiting cities. When running at speed, I get full charger output, but the alternator struggles to keep the TV’s battery appropriately charged. I recently purchased a 320A alternator (at high rpm) to replace the stock 165A, which produces 200 amps at idle; awaiting delivery of supplies needed for the install.