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08-16-2018 10:09 AM  3 months agoPost 1
Jonty

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Wellywood

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Hey team

I’ve picked up a second hand charging case with a 308 duo charger and 12v power supply. I want to be able to connect it to the 12v power supply in my car (for charging small batts) so I’m keen to know if I can add a parallel connector between the 12v power supply and the charger that can connect to alligator clips for a 12v car battery. Would this work?

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08-16-2018 12:35 PM  3 months agoPost 2
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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Yes it will work.
There is no advantage of doing it.
Once the battery depletes the power supply will overheat if it's not able to provide the amps.

I use My vehicle battery and the charger I use has a low voltage cut off. I start the vehicle every other charge for 5 minutes or I let it run while charging larger batteries.

spending time, paying attention

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08-16-2018 09:06 PM  3 months agoPost 3
Jonty

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Wellywood

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Thanks for coming back to me. Just so I undersatnd though, the 12V car supply will connect in parallel between the AC/12V power suppy module and the 308 duo (i'm in effect trying to bypass the plug in AC/12v power supply with an alligator to car 12v supply). Given this I'm not sure what you mean by overheating the power supply.

All of this is becuase I dont have an AC generator at the feild so cant plug in my AC/12V power supply so need to run off the car batt.

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08-16-2018 10:05 PM  3 months agoPost 4
RM3

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Killeen, Texas - USA

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Jonty
so I’m keen to know if I can add a parallel connector between the 12v power supply and the charger that can connect to alligator clips for a 12v car battery. Would this work?
Dont do it!

Chances are that the 12V supply you have with the charger is a switching type (not a big inefficient linear type)... Many of these supplies dont like to have power applied to the output even though the output is set to 12V because circuitry inside the supply is designed to limit the output to exactly 12... which in the case of a car is often around 13.5V or as high as 14V when the car is running. Basically you'll be back feeding the power supply and thats not good.

So its best to isolate the power supply's output leads from the 12V coming from the car with some sort of switch that will select either the power supply OR the 12V from the car.

you can use a big Diode inline with the power supply's 12V positive output lead rated for the amps you'll be pulling to prevent back feeding it... but they can get hot under load as they do have a voltage drop across them when forward biased.

either way... best to use either the supply or the car wired separately and not mess around with rigging something up to allow you to plug in after the power supply.

showing a preference will only get you into trouble, 90% of everything is crap...

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08-16-2018 10:53 PM  3 months agoPost 5
fastflyer20

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N. Tonawanda, NY

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A less expensive alternative than a genny is to buy a deep cycle 12V battery. Charge lipos at field then use a car charger and recharge the deep cycle at home.

Tom
CAUTION - my posts are based on my experiences, yours may be different.

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08-16-2018 11:23 PM  3 months agoPost 6
Dan Minick

rrKey Veteran

Columbus, WI

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I would get a set of 6 or 8mm banana plugs so you can just plug in whatever power supply you want at the time. Completely eliminating the box mounted when not in use

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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08-17-2018 10:06 AM  3 months agoPost 7
Jonty

rrVeteran

Wellywood

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Thanks all - the issue you guys indentified was exactly what I was concerned about (effectively back loading a 12v power supply at the out put end). I’ll look to make sure I have an isolated supply. Glad I checked thanks team

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08-17-2018 07:42 PM  3 months agoPost 8
Heli_Splatter

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USA

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fastflyer20
A less expensive alternative than a genny is to buy a deep cycle 12V battery. Charge lipos at field then use a car charger and recharge the deep cycle at home.
I think that this is the worst solution. I went through several marine deep discharge batteries before I learned. Best solution is to buy the generator. I wish that I had a lot earlier.

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