Scott, a solid state device that can isolate & parallel batteries with no voltage drop, producing no heat, and drawing little energy would be a first and quite a feat. I look foreward to seeing spec's & details. but it will not be in time for the dual batt project in my FZJ80.
I have been interested in the Blue sea solenoid (standard 9012 not the auto sensing 9112) since finding a link to it in the 80 section. called them up and talked to one of thier reps, he stated they are suplied by a subcontractor, they took a solenoid used in a Electic vehicle (I think he said GM EV1?) and "upgraded the specs for marine use"
did some digging online and I found Tyco electronics markets 2 lines of these solenoids and is either the suplier to Blue sea or they have a common supplier. Tyco sells it with many diffrent opions
kilovac cap200
Kilovac Ev200
been searching EV forums looking for a cheaper source for one, they were available for arround $65 in 2000/2001 but have not found a current price that low. seam to be about $100 and up now. they seam to be well thought off in smaller EV convertions, in larger higher amp installs when they have to break current higher than thier rating they are not reliable.
asked about using a capacitor in parallel with the contacts he stated was not necisary with the amperage I will be making/breaking he did sugest using one in parallel with the control contol input as the Pulse width modulation circuit that keeps the contact closed makes electrical noise, sounds like it draws a square wave current averaging .13A, frquency and duty cycle unknown. also asked about case materal, it is some kind of plastic, exact type unknown,
there are some diffrences in the specs (mailny voltage) I have been trying to figure out if they are acually diffrent or if the data is just truncated in the Blue sea version. unless i can find the Kilovac in the $60-$70 range I will pick up the blue-sea for the life time warrenty.
besides price these solenoids/contactors are the best I have found, low power use, sealed, good reliability, compact,
anyway tomorro if it is not to cold going to wire in a rear heat switch in the cab as the solenoid control switch, will have auto (alturnator good wire) off and constand parallel with matching backlighting and switch form factor to the rest of the dash also has built in lights for the diffrent positions.
sorry for the spelling grammer, bu my windows machine died last week. open office under linux is giving me problems. have to type bareback.