PD or Iota for my upgrade?
I'm thinking about a converter and battery upgrade. The batteries will be wet cell lead acid 6 volt Possible T-105s or the 230AH, EGC2 from Sam's club. I'll probably go for four. (Does nayone have...
Forum Discussion
I didn't mean that the Iota is at 14.8 from the start of Bulk, but that it goes to 14.8 in order to get the batteries to 14.6. That would be like I see when converter voltage is above battery voltage as both rise during Bulk (as seen on my ugly graphs up thread somewhere)
(Salvo has some Iota charging graphs he did that might show what really goes on with them in that regard. If he is here, those might help...)
The converter uses voltage to "know" when to start Stage 2 "Absorption" by limiting its voltage rise from there on, which lets battery voltage catch up. As it catches up, the spread between converter voltage and battery voltage shrinks, which makes the amps taper.
The graphs at the bottom of this blurb are what we are aiming for. The confusion is just about how much spread you need between charger and battery voltages.
Fisherguy shows his readings too with a good spread between converter and battery voltages on both the WFCO and his PD, similar to what I get. Note how his un-modified PD tapers during Bulk much like the first graph in the US Battery blurb. We want that bulk amps line to go straight across instead, which the mod PD, PowerMax, Vector, and many others do.
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/24129716/srt/pa/pging/1/page/1
Just how they do that I am unclear but it involves "current limit" which AFAIK means it would go higher in amps but can't, so it is stuck at its current limit and gives us that straight across amps until it reaches its voltage trigger (threshold voltage) to begin Stage 2.
http://www.wholesalesolar.com/pdf.folder/battery-folder/charging_instruction_2011_2.pdf
(Salvo has some Iota charging graphs he did that might show what really goes on with them in that regard. If he is here, those might help...)
The converter uses voltage to "know" when to start Stage 2 "Absorption" by limiting its voltage rise from there on, which lets battery voltage catch up. As it catches up, the spread between converter voltage and battery voltage shrinks, which makes the amps taper.
The graphs at the bottom of this blurb are what we are aiming for. The confusion is just about how much spread you need between charger and battery voltages.
Fisherguy shows his readings too with a good spread between converter and battery voltages on both the WFCO and his PD, similar to what I get. Note how his un-modified PD tapers during Bulk much like the first graph in the US Battery blurb. We want that bulk amps line to go straight across instead, which the mod PD, PowerMax, Vector, and many others do.
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/24129716/srt/pa/pging/1/page/1
Just how they do that I am unclear but it involves "current limit" which AFAIK means it would go higher in amps but can't, so it is stuck at its current limit and gives us that straight across amps until it reaches its voltage trigger (threshold voltage) to begin Stage 2.
http://www.wholesalesolar.com/pdf.folder/battery-folder/charging_instruction_2011_2.pdf
