PD or Iota for my upgrade?

NinerBikes wrote:
Dry Camper, do you see this single mod with adding a pot /resistor to get 14.8 volts in bulk scaleable to other PD 92XX series chargers, so as to get a set of golf cart batteries up to 14.8V as Trojan recommends?

Yes. I believe they use the same control scheme for all 92xx (and 91xx models with the charge wizard.)

I've bought a 9245C and will mount it within 3 feet of the batteries, and again use some 4 gauge wire. Battery for starters will most likely be a trojan T1275 at 150 amp hours, later the 225 ah Trojan T105's, and it seems topping the charge off fully to the 14.8 to prevent sulphation is something that should be done a few times on a 3 week trip of boondocking.

Agreed. That's what Trojan recommends.

I've read this thread a couple of times now, and know just enough to be dangerous to my self. Have you looked inside your PD 9245,

I have the PD9280. I have seen inside a PD9245, but I didn't get a really good look and it was at a time when I was not that familiar with the circuit. Still, IIRC, it was nearly the same as the patent describes.

would the resistor values be the same to get a 9245 with pendant.

Possibly. You'd need to check. See what microcontroller it uses and we can compare to the way the PD9280 works. I strongly suspect you can find the resistor that needs to changed in the same basic location, but it may not be the same value. It's part of a resistor divider, and my mod just lowers the value on one side of the divider, which increases the output voltage.

Or am I just better off trying to adjust the PWM 10 amp convertor to finish off the battery daily with 14.8 volts out of a 120 watt portable solar panel? 6.5 amps is not a lot to work with on the solar panel to finish the charge, considering how much the resistance increases in the last 5 to 10% to finish charging.

I do think that using solar is the best way to finish off the batteries, but I don't have solar. I use the voltage mod to 1) get to the recommended 14.8, as that's the only way for me to get there, 2) speed up charging (it enters the asymptotic current decay later) and 3) to adjust charge voltage for different temperatures.