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
Posting a short msg from my phone:
The transformer can be replaced or turns ratio modified, but we agree, that's not the easiest solution. I remain unconvinced that is the problem - it may just be control related. It's annoying, as I have the stuff needed to test it, but I just can't do it yet. I'm in the middle of several other RV projects now (remote water pump switch and waste hose storage and motorcycle carrier and cargo carrier), and don't want to drop those to scratch this curiosity itch. I will eventually, as I'm pretty sure the itch won't go away. :)
The transformer can be replaced or turns ratio modified, but we agree, that's not the easiest solution. I remain unconvinced that is the problem - it may just be control related. It's annoying, as I have the stuff needed to test it, but I just can't do it yet. I'm in the middle of several other RV projects now (remote water pump switch and waste hose storage and motorcycle carrier and cargo carrier), and don't want to drop those to scratch this curiosity itch. I will eventually, as I'm pretty sure the itch won't go away. :)
Salvo wrote:
We agree on the issues in regards to the PD. I don't however believe you can fix the problem by modifying the PD front end. "By "front end", I presume you mean the capacitor peak charge circuit. I believe the transformer is at fault. It doesn't have enough turns-ratio to output 14.4 at minimum cap bank voltage.
The minimum ac voltage the converter is supposed to supply full current is 105Vrms. That translates to a cap bank voltage of:
V_cap = 105Vrms * sqr2 - 2 * Vd = 152V - 2V = 150Vpeak
You want to operate at least 20V below peak voltage.
The minimum transformer turns ratio is:
N_min = (V_cap - 20V) / V_reg
N_min = 130V / 14.4V = 9
If you look at the PD patent, I bet you'll find the transformer turns ratio is higher than 9.
Sal
