I'd like to use the Orion TR48V-12V 30A converter/charger to keep a bank of 3x12V series AGM boat house batteries at charge. Solar will charge the 48V (2x24V) lithium source. The manual for the Orion states that it is "overload and short circuit proof". Does 'overload proof' mean that the Orion will stop charging when the 12V bank is at 100%? Then automatically resume charging when there is a load on the 12V bank? Finally is there a better equipment choice to accomplish this? The Smart Orion can do it, but only up to a 24V input, unless I missed the 48V model. Thanks.