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Old 01-13-2016, 09:05 AM   #1
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Converter/Charger Question

I see many of you upgrading your converter/charger. Many to the Progressive Dynamics. Sometimes to a 55 AMP (which is what my OEM is) sometimes to a 65 AMP. Why? I have a WFCO WF8955 in mine. I am not challenging you, just trying to understand what the advantage is. Is it due to a high failure rate or is there some other advantage i.e. with the charger? (I am hoping RodeoGeorge is listening as I was reading your mods that made me wonder, but I have read of a few others doing this as well. And thanks RodeoGeorge for the details in your mods. They are very helpful.)

Thanks for your expertise.
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Old 01-13-2016, 09:43 AM   #2
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I'm installing a magnum hybrid inverter.

It's a 3k inverter, plus it's a 120amp charger!

Best of both worlds.


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Old 01-13-2016, 09:46 AM   #3
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Quote:
Originally Posted by Kenny kustom View Post
I'm installing a magnum hybrid inverter.

It's a 3k inverter, plus it's a 120amp charger!

Best of both worlds.
I have a basic question on that. Is there a problem installing an inverter with a charger while having a converter with a charger built in. Are 2 chargers ok or do you disable the OEM charger when you install the inverter?
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Old 01-13-2016, 09:51 AM   #4
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My converter is out board from the panel.

With the built in ones, I would assume you just remove the dc lines going to the battery.


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Old 01-13-2016, 10:18 AM   #5
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To answer the original question,

The Progressive Dynamics converter offers a much better charge management system which will prolong the life of your batteries and reduce potential for premature damage ( ie cell evaporation).

The PD converter is also a higher quality unit which in theory is less likely to cause problems when you need it.

The main electronics panel in most RVs consists of two sub units, the converter and the distribution/fuse/breaker panel. The replacement is fairly simple as you just replace the converter assy. In most cases they are same size ( or very close). Think the PD sizes are 45A and 65 A ( no 55A) hence the switch to 65A
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Old 01-13-2016, 02:20 PM   #6
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frwright2A 65A converter is overkill in most situations. Converter size should be driven by battery bank size (max charge rate = 25% of battery capacity in AH), and other camper DC loads (not including any inverter) that would be used while hooked up to shore power or generator.


For my little A-frame with a standard single size 24 battery (80 AH), max charge rate is 20 amps. Fridge in DC mode doesn't count because I use AC mode while camping with electric. Remaining DC items are lights (5A total), heater fan (4A), and vent fan (3A). Both fans would not be running at the same time. So max DC load is about 8A. The stock 30A converter is fine, a 45A converter would not change charge times at all.


I installed 2 size 24 batteries to dry camp for 4 days/nights using heater at night. Yes, I could now use a 45A converter. But the whole point of the 2nd battery was to keep the batteries above 50% of capacity. Bulk charge can only be used to 80% of battery capacity, then the charge rate needs to drop and then taper as charge slowly climbs to 100%. With 1 battery, it takes 75 minutes (1.25hrs) in bulk mode to get to 80% from 50% - and at least 4 more hours to fully charge. With 2 batteries, it takes 2.5hrs in bulk mode to get to 80% - and the same 4 hours to get to full charge. I would save 1 hour 15 minutes in charge time (of a total 6.5hrs plus) by replacing my 30A converter with a 45A converter. The time savings with the bigger converter is only significant if I'm using a generator to charge my batteries. And then, it only matters if I'm taking my batteries down to 50% before charging. If I start charging when the batteries are at 80%+, I gain nothing with the bigger converter.


Since we are setup for short-term dry camping (4 nights), and have a camper that stores in the garage, I don't carry a generator. Battery recharging that does not happen while driving is done by plugging in when we get home. An overnight charge time to 100% is not an issue, so again the 30A converter does just fine.


just my thoughts and experiences
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Old 01-14-2016, 11:37 AM   #7
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I have in my Cedar Creek a 55amp converter/charger, I have 4 6 volt batteries. I plan to install a Progressive Dynamics converter, what amp should I go with? I looked at a 60amp, 70amp, and a 80amp. On the 80amp it said something about a 20amp plug. I am thinking maybe the 60amp or 70amp. I need advice


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Old 01-14-2016, 11:40 AM   #8
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Anything past 70 amp will need another feed from the panel.


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Old 01-14-2016, 11:48 AM   #9
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Quote:
Originally Posted by spock123 View Post
I have in my Cedar Creek a 55amp converter/charger, I have 4 6 volt batteries. I plan to install a Progressive Dynamics converter, what amp should I go with? I looked at a 60amp, 70amp, and a 80amp. On the 80amp it said something about a 20amp plug. I am thinking maybe the 60amp or 70amp. I need advice


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Assuming that your batteries are 225 Amp hours, you have a total of 450 AH at 12 volts. For true deep cycle batteries, you can discharge down to 20% state of charge. That means you recharge with 360 amp hours to full. Based on a C/8 maximum charge rate, a 55 Amp. converter/charger would do. Personally, I would go to 65 amp so that it doesn't run at full power.
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Old 01-14-2016, 01:41 PM   #10
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They only come in 60amp and 70amp. I'll get the 70amp. Many thanks


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