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Old 02-21-2019, 10:15 PM   #71
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I'd buy a similar 20A DC-DC if they had it. 25A may blow Tow fuses.
My Tow is fused for 30A. I would have to rewire my TOW for 40A output. Which might need 60A wiring.
People just don't understand fuses ! A 30A fuse will happily pass 30A of power all day long. I would probably do 35A for many minute/hours. That is just the way they are designed.

Voltage drop is a different issue. With a DC-DC power supply, if the input voltage is low, it is just going to draw more amps to maintain the output voltage.

The real issue with DC-DC power supplies is there is no "smarts" so undercharging or overcharging IS a reality !
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Old 02-22-2019, 11:59 PM   #72
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Right On. People don't understand fuses. They blow due to heat. The environments temperature effects the AMP rating. Fuses are self heating per watts law: W=A*A*R. With R being the fuses resistance.
BTW My DC-DC Watts was based on it's 93% efficiency rating. I don't trust it.
Know your batteries! The DC-DC has a set output voltage. It could over or under charge. Ditto for the wrong charger or charger setting.

13.8V worked just fine for me. PHX AZ to the Rim Country (mountains) is a 4 hour run. It's 1000 miles to see my grand kids.
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Old 02-23-2019, 10:40 AM   #73
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Right On. People don't understand fuses. They blow due to heat. The environments temperature effects the AMP rating. Fuses are self heating per watts law: W=A*A*R. With R being the fuses resistance.
BTW My DC-DC Watts was based on it's 93% efficiency rating. I don't trust it.
Know your batteries! The DC-DC has a set output voltage. It could over or under charge. Ditto for the wrong charger or charger setting.

13.8V worked just fine for me. PHX AZ to the Rim Country (mountains) is a 4 hour run. It's 1000 miles to see my grand kids.
I agree. How many hours are you going to drive. We have a 6 hour limit. Years ago we may drive 24 hours. Either way 13.8 on a already charged battery for 24 hours is ok.

Putting your TT in storage for 5 months with 13.8 volts would consume a lot of water in Flooded lead/acid and probably cause venting in AGM's.
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Old 02-23-2019, 05:33 PM   #74
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Generator 12v charging

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I boondock a lot but don't have solar. This is what I use to keep both house and battery banks charged without using my 8KW Onan generator. It's a lot cheaper and I can run into town in the toad for gas a lot easier than driving the coach in for diesel.

Hooking up straight to the battery terminals with the smart charger is much faster and more efficient than using the the 8 amp outlet on the the generator or powering the whole coach just to use the coach's charger.
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Are you charging a 12 volt battery or 2 6volts in series ?A smart charger I was looking at stated that charging the 6 volts would result in one being charged more than the other. Curious as to your experience.
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Old 02-23-2019, 06:33 PM   #75
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Are you charging a 12 volt battery or 2 6volts in series ?A smart charger I was looking at stated that charging the 6 volts would result in one being charged more than the other. Curious as to your experience.
My 4 6Vdc house batteries are wired with each pair in series and then both pairs in parallel with an output of 12Vdc. I charge them as a 12 volt bank. My chassis batteries are a pair of 12Vdc batteries wired in parallel with an output of 12Vdc. I charge them as a 12 volt bank. I start them out charging at 40 amps and my charger automatically reduces the amperage and voltage as the battery banks' SOC increases.
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Old 02-23-2019, 08:25 PM   #76
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Are you charging a 12 volt battery or 2 6volts in series ?A smart charger I was looking at stated that charging the 6 volts would result in one being charged more than the other. Curious as to your experience.
A 6 volt battery has 3 cells in series.

A 12 volt battery has 6 cells in series.

2, 6 volt batteries in series are identical to 1, 12 volt battery ( 6 cells in series ). In that case you will charge it as 1, 12 volt battery.
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Old 02-24-2019, 01:45 PM   #77
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Are you charging a 12 volt battery or 2 6volts in series ?A smart charger I was looking at stated that charging the 6 volts would result in one being charged more than the other. Curious as to your experience.
It's possible. That's why there is an Equalization Charge Voltage for occasional use.

Not good for my new Outback Nano-Carbon AGM 12v batteries.
Know your batteries.
https://batteryuniversity.com/
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