Date:         Sat, 30 Aug 2014 09:56:07 -0700
Reply-To:     Alistair Bell <albell@SHAW.CA>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Alistair Bell <albell@SHAW.CA>
Subject:      Re: Fridge on 12V
Comments: To: Rocket J Squirrel <camping.elliott@gmail.com>
In-Reply-To:  <54020094.7080402@gmail.com>
Content-Type: text/plain; charset=us-ascii

Yeah, amps in equals amps out. I should have said you have a voltage drop across the connection s you pointed out.

I agree that ditching the lighter connection is the way to go. I was looking at Anderson power pole connectors at an electronics shop with the thought of using the to connect my solar panel. But instead i bought sae type connector. You know the type, sort of like a moulded pair of bullet connectors. Had 10 gauge wire pigtails. Not saying they would be e best for you but I'm liking them, making a good tight connection and are holding up fine in the last month of use.

Alistair



> On Aug 30, 2014, at 9:49 AM, Rocket J Squirrel <camping.elliott@gmail.com> wrote:
> 
> No reason to measure amps through the cooler because amps to the socket = amps going through the cooler because amps in always equal amps out.
> 
> But heating at the socket indicates that some voltage is being lost there because heat comes from power (watts) and power = volts x amps.
> 
> Rather than measure amps going through the refrigerator, more to the point is volts lost across the socket/plug connection. If there are 2 volts (say) dropped across the connection, then the cooler has 2 fewer volts to work with, thus less power, thus less heat, thus less cooling.
> 
> 12 volts @ 9 amps = 108W, but 10 volts @ 9 amps = 90W. The other 18 watts are being dissipated at the socket, instead of in the cooler's element.
> 
> That said, there's also no need for me to measure this stuff because the hot plug is reason enough on its own to sort out, and it indicates that it is stealing power from the element. I may switch over to a burlier connector. A little Anderson Powerpole, mebbe.
> 
> -- 
> Jack "Rocket j Squirrel" Elliott
> 1984 Westfalia, auto trans,
> Bend, Ore.
> 
>> On 08/30/2014 09:27 AM, Alistair Bell wrote:
>> You are drawing 9 Amps from the battery yes, but if the lighter socket is getting hot that would indicate resistance in the connection and some portion of the current is being lost, converted to heat, before it gets to the cooler. Can you measure amps at the cooler?
>> 
>> Right?
>> 
>> Alistair
>> 
>> 
>> 
>> 
>>> On Aug 30, 2014, at 9:09 AM, Rocket J Squirrel <camping.elliott@GMAIL.COM> wrote:
>>> 
>>> This came up about a week ago. In theory, the 120V and 12V elements
>>> should While driving I had it hooked to the house battery,
>>> and I can tell that it was drawing plenty power because the cigar
>>> lighter plug got real warm -- hot almost. Shouldn't get that hot, I'm
>>> going to look into the thing to see if I can sort it out. The house
>>> battery ammeter showed about 9A of constant current draw, indicating a
>>> solid current path.
>>> 
>>>>