Forum Discussion

hondochica's avatar
hondochica
Explorer
Feb 06, 2016

Batt charging Q - PD9245; and adding solar

Greetings;

I am trying to get my little Rialta up to speed for full-timing. And need advice/help on charging my batteries and adding solar.

I have 2 27 group walmart marine/deep batteries - about 1 year old - both in good condition.
I just added a Trimetric 2030rv battery monitor.
I have a PD9245 charger/converter which I installed several years ago. Am not fully convinced it's operating properly.

Q: How long should it take to fully charge my batteries? My trimetric indicated my batteries were at 12.3 volts. So I fired up the gen (onan) to recharge. I've been running it for nearly 4 hours now and have not yet hit "full"; the PD is on 'boost' - according to the monitor charging at 14.1 at now +1.15 amps (started at about 5 amps) - no current draw. Seems to be taking toooo long!

I use very little power and would like to add solar to minimize gen use. Have spent several hours reading now. Could probably spend Days reading and still have Qs. I would like enough solar power to: recharge my laptop battery (not necessarily run the computer); run small portable dometic fridge/freezer (pulls about 3 amps when already at set temp - so only runs periodically); . . gee . . my internet access thingy (pulls 1 amp w/ small inverter; a light or two at night (pulls 1 amp each) . . don't need much else. (amps from battery monitor which each item on individually (no other draw)). Oh - and the furnace - at night - looks like the fan pulls about 3.5 amps but only kicks on 5-6 times a night for 2-3 min.

How much solar power would I need? Any recs for 'portable' panels - not mounted.

thanks so much!!

Kelly
Rialta 01FD twins
currently in Quartzsite, AZ

22 Replies

  • landyacht318 wrote:
    PD should seek and hold 14.4v. If trimetric is reading only 14.1c, well that 0.3v unaccounted for, somewhere, or indicating some inaccuracy somewhere.


    Yea, I always thought the PD should seek 14.4 or 14.6 while charging - which is why I wonder if it's working properly. But then, it may be that the monitor is reading the actual charge on the battery (?) not what's going in? As I'm new to this Trimetric - I'm not sure which it is. Will have to call them on Monday.

    I'm sure the shunt is wired correctly, as I have no other cables on the house batteries except the ground - which is now on one side of the shunt, with the other side 'grounded' back to the batttery. In other words - there's no other way to wire it!

    As for the engine ground? I have no idea.

    Appreciate your time!

    Kelly
  • PD should seek and hold 14.4v. If trimetric is reading only 14.1c, well that 0.3v unaccounted for, somewhere, or indicating some inaccuracy somewhere.

    Many people wire their trimetric's Shunt incorrectly. No wire can go directly to battery(-) terminal that does not go to the shunt. The only wires on the battery(-) should be the one from the battery side of the Shunt.

    If the house battery is directly grounded to engine battery, nothing can be directly grounded to engine battery either as current can than also bypass the shunt.

    Pretty much impossible to reach full charge in less than 5 hours with Lead acid, and 5 to 7 is more likely when the charging source maintains a 14v+ absorption voltage for the last 4 hours

About Technical Issues

Having RV issues? Connect with others who have been in your shoes.24,284 PostsLatest Activity: Jul 20, 2025