Electrical Systems, Charging and Solar Electrical components and wiring, batteries, charging systems, generators and solar topics.
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Old 07-07-2019, 06:50 PM   #1
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Default Refrig running down battery.

When traveling I put the fridge on 12 V and several hours later when we arrive at rv park I find that the camper battery is practically dead. I have the power line from the truck battery to the 7 terminal connector and have tested with a voltage meter all the way to the battery on camper and am getting power. I can hook up truck and disconnect camper battery and fridge is working off of truck power. Also with camper positive cable disconnected and truck running I have power all the way to end of camper battery positive cable from the truck. Hooking camper battery back up and also connected to truck why is it not keeping my battery charged while I travel with fridge turned? Fridge works great on A/C or D/C power.
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Old 07-07-2019, 07:55 PM   #2
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Freddie, the truck wiring is not heavy enough to prevent too large a voltage drop. It will go below the camper battery voltage and then the fridge will draw from the camper battery. I ran a separate 6 gage line direct from the truck battery to a separate connector.
Works great
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Old 07-10-2019, 11:15 AM   #3
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^^^

What he said! In my truck the 10 gauge wiring to the trailer plug was not able to keep up with the refrigerator's demand either. However, my 300 Watt solar panel installation on the roof of my trailer works constantly when traveling and we arrive at a campsite now with a fully charged battery now.

So, those are two options for you.

- Jack
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Old 07-10-2019, 11:35 AM   #4
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Default Replacing wiring first

I currently have a # 12 wire running from battery. Am going for a #6 wire and see if that helps. If not I may attempt the solar panel if I think I can actually install and wire up one.

I appreciate the answers and will keep on it since my wife really likes to have cold things in the fridge when we set up and I like to have power to raise the camper immediately.
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Old 07-10-2019, 12:32 PM   #5
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Freddie - I think 6-gauge may be a bit of "overkill". 8-gauge should be enough to carry the needed Amperage. Of course, you can install anything, but 6-gauge is awfully thick and quite difficult to work with. And, I think I misspoke in my previous post. I think the wiring in my vehicle is 12-gauge, not 10. Higher numbers are thinner. My solar wiring is all 10-gauge.

The other consideration is your tow vehicle's alternator. It may not have the capacity to provide the needed additional current. If your vehicle is equipped with a "tow package", it probably does, but you MAY find that to be problematic too, but I suspect the wire size is the main culprit.

- Jack
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Old 07-11-2019, 08:15 AM   #6
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If you haven't already, you may want to add a second 12-volt battery, that will double your battery power.
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Old 11-07-2019, 01:42 PM   #7
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back to dealing with this problem. Bought a heavier and newer truck for towing but same battery problem. Can you actually hookup two 12v batteries in tandum and not mess up the 12v system? There is room for a second battery and a second tie-down in the compartment.
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Old 11-07-2019, 02:05 PM   #8
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Freddie - Yes, you CAN hook up two 12V batteries in a 12V system and not mess up anything, as long as there is room for both. The key is: you HAVE to connect them in parallel, which means you MUST connect the two positive posts of the batteries together and the two negative posts of the batteries together using short, heavy, "jumper cables". Then you simply attach the positive cable of the trailer to a positive battery terminal and the negative trailer cable to a negative battery terminal. It does not matter which battery is connected to the trailer, because the parallel unit is "seen" by the trailer as ONE bigger battery, at 12V.

The other, WRONG way to connect the batteries would be in "series". This would use only ONE jumper cable, connecting the positive post of one battery to the negative post of the other. Then, the trailer cables would be attached to the two remaining free posts. Again, this is the WRONG way, because the batteries now deliver 24V, which will damage electronics and/or blow fuses.

- Jack
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Old 11-07-2019, 02:25 PM   #9
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Thank you.........Jack. Am going to give this a try. Was thinking it might could be an alternative.
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Old 11-07-2019, 03:07 PM   #10
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This is the way I have mine hooked up - second post in this thread: Adding a second battery - Forest River Forums

A quick scan through that thread revealed some other useful information too. I suggest you read it.

- Jack
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Old 11-07-2019, 05:34 PM   #11
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I replaced old with larger 6 gauge wire on all my trailers. Dedicated + and - wires straight from battery and fused on the positive side, the fuse tucked away in battery box. For example on my PopUp trailer (the most recent one I did) I took some before and after voltage reading. Old wire with fridge off I had 12.65 volts at battery and it was 12.2 volts back at the fridge terminal block. Turned the Fridge on and my battery went to 12.0 volts and back at the fridge was at 10.3. There was only about 15 feet of wire but probably 12-14 gauge. That was a loss of 1.7 volts or .11 volts per foot of circuit.

After changing the wire ( required a new terminal block at the fridge to handle the larger gauge ) I had 12.65 volts at battery and fridge with the fridge off. When I turned it on the battery went to 12.55 volts and at the fridge I had 12.2 volts, a drop of .35 volts.

This was a supply voltage increase at the fridge of 1.9 volts or .127 volts per foot of circuit. A huge improvement.
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Old 11-07-2019, 05:50 PM   #12
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Thanks for all the info. Made copies for my file folder and will be doing this before next trip on the day following Thanksgiving.
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