[RE-wrenches] DC Solenoid Coil Current

[Larry Crutcher, Starlight Solar Power Systems]

Hi Jerry,

The no-fault condition from the CPU is +12Vdc. A fault causes 0 volts. These are the contactors I plan to use: http://www.alliedelec.com/search/productdetail.aspx?SKU=70062412

Larry

 

On Feb 13, 2014, at 12:38 PM, Jerry Shafer <jerrysgarage01 at gmail.com> wrote:

So Ian clear does the fault activate the relay or does the absence of the fault activate the relay because its usually best to have a absent or no fault hold the relay on and if anything fails as a the relay will rest this can be done with motorized on or contactor high load switch, you should also look at the switch AIC rating also
Jerry

On Feb 11, 2014 4:43 PM, "Larry Crutcher, Starlight Solar Power Systems" <larry at starlightsolar.com> wrote:
Hello Wrenches,

We're preparing to offer Lithium batteries to some of our customers as a replacement to lead acid in recreational vehicles. RV batteries can have multiple charge sources simultaneously so I have worked out protective circuitry to interface with a EMS computer. To insure failsafe operation, I need to install 2 solenoids that will be active 24/7, opening only when fault conditions are met.

The solenoids I have looked at (200 amp) have a coil current of about 1 ampere each which equates to 600Wh daily consumption. I'de like to reduce that BUT the computer only provides a +12v or 0 volt state. 

Does anyone know of a latching solenoid that will work with a 12v hi/lo voltage state,
OR an interface or circuit for hi/lo to control latching relay
OR a solenoid with a very low quiescent current when on? 

Many thanks in advance, 

Larry Crutcher



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