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    1. · Premium Member
      Joined
      ·
      1,237 Posts
      Thanks, maybe you can give me your opinion on this.

      I own one of those original 99mpg grid chargers, while it does the job it is always a pain to use it and just want something easier. I just want to plug 110 volts AC into the exterior of my car and the grid charger starts until I unplug it. I don't want to have to lug the 99mpg grid charger into my hatch, go through settings, and all that stuff everytime I want to charge.

      What I would like to do is connect permanently the 500 mA LED driver.

      Not sure if this is needed, but for safety I will use this temperature controller.

      https://www.amazon.com/dp/B00862G3TQ?ref_=pe_623860_70668520

      What I will do is have the temp probe connected to a single battery stick and this will shut off charging if the battery gets too hot. Most likely if I forget to shut off the grid charging.

      I can also have that temperature controller turn on the 12 volt cooling fan on the pack. It has dual outputs, so it can turn on the LED Driver and the 12 volt cooling fan.

      This temp controller also automatically starts if there is a power failure, so all I have to do is simply plug in 120 volts AC from the outside and the LED Driver starts, the battery fan starts, and I have the safety of shutting everything off if a battery stick gets too hot.

      I would run an AC power outlet to the front of my car so I can easily plug into AC power to my house without having to run an extension cord through my hatch and back the car up my driveway.

      I would keep all these units inside the car permanently.

      What is your opinion on this as an easy, just plug it in on the outside, and have it safely charge my battery until I unplug it again? Is a temp controller even needed for safety when charging at 500 mA, like even if you left it on forever would that be enough current to overheat the batteries?
       
    2. · Registered
      Joined
      ·
      2,058 Posts
      Thanks, maybe you can give me your opinion on this.

      I own one of those original 99mpg grid chargers, while it does the job it is always a pain to use it and just want something easier. I just want to plug 110 volts AC into the exterior of my car and the grid charger starts until I unplug it. I don't want to have to lug the 99mpg grid charger into my hatch, go through settings, and all that stuff everytime I want to charge.

      You may end up with a MIL with the charger connected while driving the car. Search the forum and see if this is true or not for your charger. If it is true then you will need to use a double pole relay to disconnect the hi voltage leads inside the charger when the AC power is removed.

      What I would like to do is connect permanently the 500 mA LED driver.

      Not sure if this is needed, but for safety I will use this temperature controller.

      https://www.amazon.com/dp/B00862G3TQ?ref_=pe_623860_70668520

      What I will do is have the temp probe connected to a single battery stick and this will shut off charging if the battery gets too hot. Most likely if I forget to shut off the grid charging.

      Ahh but which cell is the hotest one to connect the sensor to?

      I can also have that temperature controller turn on the 12 volt cooling fan on the pack. It has dual outputs, so it can turn on the LED Driver and the 12 volt cooling fan.

      It's much simpler to just run the fan whenever the AC voltage is applied to the charger.

      If the 12v supply is permanently connected to the positive fan lead (which is the car's "Switched 12v" & "Start" system wiring) and if the negative output lead of the supply isn't isolated from ground then the fan will run all the time while driving the car if the charger is grounded in the instillation.

      While the fan might run ok you will be applying 12v to the car's electrical system while charging even with the key set to OFF. The 12v supplies normally used in grid chargers will not have enough current capability to run the 12v system. In addition: the 12v supply will have to capable of withstanding 14v applied to it while driving the car (depends upon if the supply is regulated and how it is done).


      This temp controller also automatically starts if there is a power failure, so all I have to do is simply plug in 120 volts AC from the outside and the LED Driver starts, the battery fan starts, and I have the safety of shutting everything off if a battery stick gets too hot.

      What is your opinion on this as an easy, just plug it in on the outside, and have it safely charge my battery until I unplug it again? Is a temp controller even needed for safety when charging at 500 mA, like even if you left it on forever would that be enough current to overheat the batteries?
      I would guess in Arizona even charging the battery with the car closed in the sun would stresses the pack.

      More charge current isn't always more better. The idea is to give the weak cells time to get fully charged. Cells with high resistance can appear to fully charged when they are charged at higher currents. At the same time the cell voltage while charging goes down as the cells get hotter.
       

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