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Old 05-04-2014, 09:38 AM   #21
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Herk, I will do that. I am pretty sure the battery "boost" side of the system works, as I had to use that a couple of months ago. I believe that system travels through the isolator from the picture of the isolator manager. The other really strange thing is that recently when I turn on the ignition key, I get nothing. If I turn the key in the opposite direction (left) and then right again, the ignition works. I looked behind the ignition switch, only 4 light red wires coming in, and none of the wires were loose. Since I installed the upgraded remote controller for the inverter, that ignition system problem appears to have gone away, but I haven't driven it enough lately to be sure. Craig
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Old 05-04-2014, 12:19 PM   #22
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Originally Posted by boowho View Post
And I'm still curious as to why my batts willl drop from 12.7+ to 12.2 after running the inverter for less than 4 hours at a 9 Amp draw. I previously thought that it was because my original batts were completely "cooked", but now I have 4 brand new Trojans and I still don't get the capacity I think I should.
Boowho??
Question...how do you KNOW that :
A) You have only a 9 amp draw for 4 hours?
B) Your real battery voltage is 12.2?
Are you using a real battery monitor (like a trimetic or victron) or clamp meter or something else for your measurements?

One thing I can say is that when you are using something with a decent amp draw for a while...it will pull down your voltage below what resting voltage is...after the load is off it will slowly creep back up...so be sure to give it a couple of hours with NO LOAD before you determine that it is at 12.2...I'd be surprised if it isn't really at 12.4 after letting it rest.
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Old 05-04-2014, 12:58 PM   #23
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Herk,
Lots of good info.
Thanks,
Tom
X2..... Now if I can just under stand it!!!

boowho??
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Old 05-04-2014, 01:11 PM   #24
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Originally Posted by camaraderie View Post
Question...how do you KNOW that :
A) You have only a 9 amp draw for 4 hours?
B) Your real battery voltage is 12.2?
Are you using a real battery monitor (like a trimetic or victron) or clamp meter or something else for your measurements?

One thing I can say is that when you are using something with a decent amp draw for a while...it will pull down your voltage below what resting voltage is...after the load is off it will slowly creep back up...so be sure to give it a couple of hours with NO LOAD before you determine that it is at 12.2...I'd be surprised if it isn't really at 12.4 after letting it rest.
A) that's what was showing on the Magnum panel. 9 AMPS. There may be additional loads on the batts that don't go thru the inverter, but I would think they'd be fairly light.

B) again, that's what was showing on the Magnum panel. 12.2

With regard to the the voltage creeping back up, or the range not being linear, I understand that. However, next morning my slides would BARELY pull in, especially the front two hydraulic ones.

Thanks for you interest/info/suggestions. (to everyone, actualy)

Boowho??
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Old 05-04-2014, 01:13 PM   #25
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X2..... Now if I can just under stand it!!!

boowho??

Here is one that is "Zoom-able" so you can follow the traces.
Herk
Attached Files
File Type: pdf Georgetown-Battery Connect Center.pdf (318.6 KB, 16 views)
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Old 05-04-2014, 01:28 PM   #26
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Originally Posted by boowho View Post
A) that's what was showing on the Magnum panel. 9 AMPS. There may be additional loads on the batts that don't go thru the inverter, but I would think they'd be fairly light.

B) again, that's what was showing on the Magnum panel. 12.2

With regard to the the voltage creeping back up, or the range not being linear, I understand that. However, next morning my slides would BARELY pull in, especially the front two hydraulic ones.

Thanks for you interest/info/suggestions. (to everyone, actualy)

Boowho??
So a couple of things are going on here:

Accepted at face value, 9 amps for 4 hours is 36 amp hours.
A typical OEM battery is about 70 amp hours at 100% charge

12.2 Volts DC equates to a 60% of capacity battery (assuming it was "rested" when tested. (or about right for an unstressed battery when tested).

When a deep cycle battery is "stressed" (asked to provide more than 5 amps), the capacity to deliver amperage decreases rapidly (see attached graph). This graph is for a 100AH battery, but you can use the plot as a percent of capacity for any battery.

If you ask a 50 or 60% charged battery to deliver the 15 or so amps a slide requires (more if the slide is loaded near its maximum capacity), you can see how the battery voltage will rapidly decline.

If you enter the graph at 100% = your 60% discharged battery and demand 15 amps, the available capacity will be reduced an additional 40% (or so).

This equates to a deliverable voltage of a battery at 25% (or less) capacity or around 11.5 volts under load (or less).

Hope this helps to see what is going on.
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Name:	battery voltage and capacity Curve vs Discharge Rate.jpg
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Old 05-04-2014, 01:28 PM   #27
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Herk,
I'm not sure that the schematic for a Georgetown would be the same as for a Berkshire. I have found that there are differences in Berkshires even though they are the same model and same model year.
Tom
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Old 05-04-2014, 01:31 PM   #28
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Herk,
I'm not sure that the schematic for a Georgetown would be the same as for a Berkshire. I have found that there are differences in Berkshires even though they are the same model and same model year.
Tom
The schematic should be "representative" of the process. Locations and values may be different, but the process is identical for troubleshooting.
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Old 05-04-2014, 01:31 PM   #29
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Originally Posted by boowho View Post
A) that's what was showing on the Magnum panel. 9 AMPS. There may be additional loads on the batts that don't go thru the inverter, but I would think they'd be fairly light.

B) again, that's what was showing on the Magnum panel. 12.2

With regard to the the voltage creeping back up, or the range not being linear, I understand that. However, next morning my slides would BARELY pull in, especially the front two hydraulic ones.

Thanks for you interest/info/suggestions. (to everyone, actualy)

Boowho??
Bill,
Was the coach plugged in overnight when your slides barely pulled in? If so, something else must be going on that would cause them not to charge.
Tom
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Old 05-04-2014, 01:39 PM   #30
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Bill,
Was the coach plugged in overnight when your slides barely pulled in? If so, something else must be going on that would cause them not to charge.
Tom
I got the impression he was boondocking...
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