[RE-wrenches] DC Solenoid Coil Current

[Jerry Shafer]

OK So if you only have the 600 watts per day when you are either on shore
power or on a genny can you design the system to not be needed when they
are off and kill that load
Jerry
On Feb 13, 2014 11:51 AM, "Larry Crutcher, Starlight Solar Power Systems" <
larry at starlightsolar.com> wrote:

> 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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