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Old 05-02-2016, 09:24 PM   #11
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This evening my batteries were measuring around 12.4V (roughly in the 80% range) so I plugged in the shore power. 13.66V at the power center and 13.48V at the batteries.....that puts the drop around 1.24%


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13.66V seems right in line with what I would expect. Since the batteries were down to 12.4V, your charging current was most likely fairly high to start off, I would think about 15Amps. 1.24% looks to me like a reasonable voltage drop. As the batteries charge the current will continue to drop and the voltage drop will decrease as well.
If you really what to find out what is going on invest in a clamp-on DC amp meter so you can see what your current draw/source really is.
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Old 05-03-2016, 07:36 AM   #12
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Try the test again with the RV UNPLUGED..(no 30 amp service)
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Old 05-03-2016, 08:23 AM   #13
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Try the test again with the RV UNPLUGED..(no 30 amp service)
x2
Use only the battery as the voltage source

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Old 05-03-2016, 08:58 AM   #14
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That drop will only be there with that sort of charge(like you said, 80%), and will change (be higher drop for lower percentage of battery and lower drop when approaching 100%). In the current (no pun intended) condition I wouldn't worry about that small amount of drop, if there is more draw...

What is the largest conductor your power center can take? If you are that worried, change it to a heavier gauge and report your findings here, I don't think you will see that much of a difference.
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Old 05-10-2016, 01:37 PM   #15
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I just tried this with my trailer. My PD 55amp converter was putting out 13.68 volts and my batteries (Trojan 6V) were reading 13.2 volts. This was after letting the batteries drain down to 12.4 volts and plugging in. My wire from battery to converter is 6 gauge and the converter is about 1/3 of the way back from the front of the trailer. I was somewhat surprised to see that much of a drop.

Is this going to harm my batteries? It seems like the converter is trying to give them 13.7 and they're only getting 13.2.
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Old 05-14-2016, 12:37 PM   #16
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I just tried this with my trailer. My PD 55amp converter was putting out 13.68 volts and my batteries (Trojan 6V) were reading 13.2 volts. This was after letting the batteries drain down to 12.4 volts and plugging in. My wire from battery to converter is 6 gauge and the converter is about 1/3 of the way back from the front of the trailer. I was somewhat surprised to see that much of a drop.

Is this going to harm my batteries? It seems like the converter is trying to give them 13.7 and they're only getting 13.2.


Based on the manufacture specifics for your batteries, I would say they are never going to get the recommended voltage during the bulk phase of the charge. I would venture to say this will cause a shorter life.
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Old 05-14-2016, 01:15 PM   #17
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Based on the manufacture specifics for your batteries, I would say they are never going to get the recommended voltage during the bulk phase of the charge. I would venture to say this will cause a shorter life.
I agree. Here's a screenshot from the Trojan T-105 data sheet. It calls for 14.8 VDC for the bulk charge period.
http://www.trojanbattery.com/pdf/dat...ata_Sheets.pdf
I'm pretty sure that the low charging voltage my onboard converter supplies has caused my Trojans to deteriorate faster than they would have than if they were charged with the recommended voltages.
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Old 05-14-2016, 01:52 PM   #18
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Based on the manufacture specifics for your batteries, I would say they are never going to get the recommended voltage during the bulk phase of the charge. I would venture to say this will cause a shorter life.

You may or may not hit 14+ VDC for the charge voltage if the batteries are near fully charged. If so, it may for a brief time, then the charge controller will drop the voltage. If you want to see if the battery controller will hit 14+ Volts, pull your shore power connection, put your ceiling fan on, all the interior lights on, radio on, for about 4 to 6 hours (or the battery voltage discharges to 12.0VDC), then plug in to shore power. (monitor the battery voltage during the discharge so the battery does not drop below 12VDC) Check your battery voltage level. It should hit 14+ volts then. If not, check the charger specifications...

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Old 05-15-2016, 12:34 PM   #19
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I left the Fridge and lights on last night, planning to put significant drain on the batteries for some more testing. This AM the voltage at the batteries read 9.67V (Bad batteries....blah blah blah, I blame the four months the trailer spent at the dealer). Upon plugging in I had 13.6 at the converter, and 13.06 at the batteries. 24amps was the draw the batteries were getting at first plug in.

Three times the external breaker attached to the outside of the trailer popped. I never saw the type of voltage that should be coming with a "bulk charge" from the WFCO (14.4) as advertised.

Should the charger immediately go to 14.4 with Battery levels that low? When does the 14.4 mode turn on?


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Old 05-26-2016, 01:17 PM   #20
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Did a battery box project this weekend, which forced me to do some rerouting of wires. Low and behold, the charge wire was running through a 20amp auto-rest breaker on the front of the trailer.



I replaced it with a 40 amp, since it was always popping on and off when I would first add shore power after running the batteries down. Upon powering up, I'm at 14.56v at the converter and 14.22v at my batteries. Pushing about 24 amps 15 minutes after plugging in.


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