Re: Three batteries, two motors, two switches
First off if you don't use switches in your set up then you're asking for trouble. Wires linked from battery directly to engine? You'll still bleed off amps and slow drain the battery.
If leaving your battery hooked up, drains it, then you need to figure out where your problem is.
That hellfire set up sounds hokey pokey to me. Bottom line is that any isolator out there relies on diodes to work. If a diode fails you don't know about it until your batteries fail you. They claim that the voltage loss is less than half an amp or whatever when the battery approaches full charge, but what about when the battery is taxed and in need of a decent charging current? My guess is you are losing almost a volt like all other isolators. The Blue Sea ACR's are also a lot smaller than any isolator out there. The one on my boat is less than 3" by 3" and you can find them thinner than that. The best part is that you have zero, none, nada in the loss of voltage department.
First, "hokey pokey", that's strange because they are designed to do EXACTLY what the OP is looking for. I think if you actually R E A D the link you may see that.
Second, your full of crap about your Sea Blue having no voltage loss. R E A D thier website.
ML Series Heavy Duty; <40mA Charge state, <10mA Sensing state.
L series w/coil; 12 Volts DC/0.13 Amperes DC, 24 Volts DC/0.07 Amperes DC
SI Series; 15mA
And here's thier version of a "hokey pokey" auto-charge/combiner unit.
CL-Series BatteryLink;
Automatically combines battery banks during the charging cycle and isolates under discharge
Limits current flow allowing smaller wire size
Adjustable high voltage disconnect
Adjustable low voltage disconnect and combine voltages
Activates from any charging source?alternators, battery chargers, or solar panels
Senses charge voltages on up to two battery banks
Ignition protected?safe for installation aboard gasoline powered boats
Noise free circuitry will not interfere with other devices
Low current draw when closed: <0.2A
.2??? The hellroaring product does the same thing, and is rated .012...
Sure sounds hokey pokey to me...
on edit;
Here's hellroarings stated voltage drop fot the 75300a model;
Voltage drop at 5 amps to the auxiliary battery system
< 0.05, <0.02, or < 0.01 Volts
(depends on configuration used)
Not anywhere near half a volt...