That's similar to the setup that International uses on the ProStars. Celadon's trucks are equipped with them. The system will run for 10hrs without a problem, but not when running the A/C. After 2-3 hours sitting in Laredo on a hot day, the truck will set off the low battery alarm. The truck has 8 batteries all tied together instead of the normal 4. One good thing with theirs is that you can use the Auto-Start feature, which will start the truck to recharge the batteries when it senses that they're getting low. On a hot day, it'll go 2-3 hours without the engine, start the engine to run 1-1.5hrs to recharge, shut down and the cycle continues.
In an area with 'normal' summer temps, where the outside temperature will drop to the low 70's at night, the truck easily went 10-14hrs without needing to restart itself.
It definitely helped with the idling, that's for sure. In fact, their trucks are set up so that they won't idle for more than 5 minutes unless the outside temperature is below 20 or above 150. The downside to their idle setup is that all it took was for the truck to be stopped for that amount of time - the brakes didn't have to be set for it to shut itself down - just stopped.
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