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I'm not sure I fully understand your problem. You say that the charger charges your batteries and goes from absorption mode to float. Then as you turn on DC loads (which are supplied by the battery), your voltage drops, the charger senses it and reverts to absorption mode to top off the battery. That's what it is supposed to do, but it probably shouldn't do it quite as quickly as it is. Perhaps there is not enough reserve in the chargers capacity to stay in the float mode or the problem could be that the battery voltage is dropping too quickly under load. It almost seems to me that some of your problem could be insufficient house battery capacity.
Are you using deep cell batteries or battery for your house loads (starting or auto batteries are not appropriate for house loads)? What would happen if you used the loads without the charger connected? Does the charger provide enough extra DC current for the loads when it does go into the absorption mode?
If so maybe you really don't have a problem with the charger and should look harder at the batteries.
Good Luck
Joe S
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