I have a 100 W panel charging a 100AH lead acid starter battery (SB) through a Smart MPPT. When the 'engine on' voltage signal is given an Orion DC-DC takes input from the SB and charges a 300AH house bank (HB). (Currently also lead acid but possibly Lithium in the future.)
If the HB has a significant draw it causes the SB to give the 'engine off' signal and until the SB has recovered, a few seconds usually , the Orion sleeps. This results in the voltage in both HB & SB cycling around near the float voltage until either the demand drops or the panel provides enough power to keep everyone in the absorption phase, or later float.
My QUESTION is this. Does this cycling have any detrimental effect on either the batteries or the Orion?
This is of course an issue when the boat engine is off. When the engine is on the alternator has enough power to hold the start battery up whatever the Orion chooses to draw. Most of the time boat engines are not running however.