We're getting side tracked here and comparing apples to oranges.
A battery protector prevents your batteries from being over discharged, prolonging the life span of those batteries and preventing a dead starting battery.
Battery isolators have the ability to isolate the starting battery from your house battery, but do nothing to protect either battery from being over discharged.
I isolate my house and starting batteries manually, so that each system is a separate entity, even though I do occasionally use my starting battery for house power. With these protectors, it will kill my house power, but leave me plenty of starting power.
I charge my house battery by plugging it into my vehicles cigarette lighter outlet, and unplug it when I'm not driving. Since I have protectors on both batteries, neither can be drawn so low as to leave me stranded.
I would classify isolators as optional, and protectors as essential.
A battery protector prevents your batteries from being over discharged, prolonging the life span of those batteries and preventing a dead starting battery.
Battery isolators have the ability to isolate the starting battery from your house battery, but do nothing to protect either battery from being over discharged.
I isolate my house and starting batteries manually, so that each system is a separate entity, even though I do occasionally use my starting battery for house power. With these protectors, it will kill my house power, but leave me plenty of starting power.
I charge my house battery by plugging it into my vehicles cigarette lighter outlet, and unplug it when I'm not driving. Since I have protectors on both batteries, neither can be drawn so low as to leave me stranded.
I would classify isolators as optional, and protectors as essential.