Forum Discussion

ctrout's avatar
ctrout
Explorer
Mar 18, 2016

Upgrading power system

I have an old camper but I would rather just take care of it and fix/upgrade it as necessary as opposed to get rid of it and spend tens of thousands for another one. With that in mind, I'm at the point where I need to revamp the power. The converter crapped out on me halfway through the season last year and I couldn't afford or justify the repair then but things have changed and I'm ready to drop some serious cash.

Please give me your opinions on the planned system. This is a 1992 Dutchmen 26' bumper tow that I gave about $3000 for it in 2008 I think and it has been a really good camper for our family. We have used it maybe three times on "shore power" as we prefer to camp far from others if possible. I had a set of 6v deep cycle flooded batteries that I got brand new in 2009 but I wasn't really good about caring for them so they are all but worthless now. Last year I finally checked them and they were probably only half full of electrolyte so I filled them but the damage was already done.

So here is my plan. A pair of batteries made by Universal Power Group. I have a pair of 12v, AGM, 110ah UB121100s running my ham radio shack and I am happy with them so far but I've only had them about six months and haven't really given them a workout yet. I thought of getting the UB62000s but they would hold 20ah less and I can't think of any advantage in running s6v AGMs vs the 12v set. Am I missing something here?

On to the converter. The previous converter was the standard 30amp el-cheapo that came in almost every camper in the early 90s. Since this one let the magic smoke out, I figured why put the same el-cheapo back in there so I'm thinking of putting in the Progressive Dynamics (PD9245CV) 45 Amp Power Converter with Charge Wizard. I don't think I need a 45 amp converter but I have read all the rave reviews on the PD converters and I think that a 45 amp is the smallest they make.

Finally, the boon docking magic. I have a single 100w Renogy mono crystalline solar panel with PWM charge controller on my ham shack and it works great so far. I can run my 100w Kenwood at about 20% duty cycle, run a strip of about 100 LEDs, a standard 15w (?) camper bulb, a 50w Kenwood dual band radio on standby, all for about three hours at night and by the time I check the batteries the next day at noon, they are sitting at like 13.6v. The plan for the boon docking castle is to get the 300w Renogy kit that comes with the 40A MPPT charge controller so I can have my 16 day hunting trip in October and not worry about the heater running all night killing my batteries.

Does all of this sound like it will work well together or is there something else I need to consider?
  • No real battery difference in 6v vs. 12v in AGM. Only difference is series connection is always balanced. Nothing really bad about 2x 12v in parallel either if main power is connected across both. (+ connected to first battery and - connected to the second)

    9245 is fine and about max for a 1000va generator. There is a 9140. IOTA has a 30a and a 15a if you want to go smaller.

    400w solar seems like a lot of solar for two batteries. Yes you will need it in the winter and I think you may also find more battery will increase your solar harvest to stay in bulk longer.

    Definitely swap all lights to LED.
  • The one addition I would make is a battery monitor Trimetric or Victron to keep you above the 50% SOC
  • I'd suggest to mount the 300W on the roof and maintain the batteries. With the right controller, you will never need to turn on the converter. I wouldn't buy any other brand of converter than PD. Mine is going strong and is 45 yrs old.
  • Well, I went ahead and ordered everything and it should all be here sometime next week. I got brand new tires on the F250 today and new ball joints to come on Monday. The truck and camper are coming along nicely now for the new season and I'm stoked!

    I heavenly ordered 300w in panels and my single panel on my radio station puts out 5.5 amps (measured) open circuit, at noon so the 3 panel kit should theoretically get me about 16 amps. Not bad for 2 batteries. I think I'll be ok with that.

    The other thing, concerning the converter, I will pretty much never use it except when the camper is stored so I have no use for quick charging. If I have to recharge with the generator for some reason, I've never encountered generator restrictions on the BLM and national forest where I boondock except that I have to meet the requirements for the spark arrestor. One mountain I was camping on for 12 days and never even saw another soul to complain! I HATE generator noise myself so if my batteries are in bad enough condition that I need to run the generator, I'd sooner pack up and go home anyway. This is why I am investing in solar.

    I can't believe that my panels won't replace what I use except for an extreme exception perhaps. We have nearly non-stop sun during the season and I usually only run a max of two lights at a time for 5 hours max each night. During hunting season I run the furnace all night but without solar and a brand new set of wet cells, I could run the furnace for 5 nights before the batteries needed a recharge.

    I do plan on adding perhaps one more battery and panel somewhere in the next three months or so though. I think that 330Ah and 400 watts should do anything I want to do while camping, even calling CQ DX for three hours a night. In the past, I have spent 2-3 hours working DX on a 8.4Ah Lifepo4 battery and I expired before the battery did. I got into 13 countries in one night from the bottom of a canyon on an inverted vee with a feed point only about 14 feet off the ground.
  • wa8yxm's avatar
    wa8yxm
    Explorer III
    Well, I will say the Progressive Dynamics Wizard controlled converters are the best.. I have done a lot of research and yet to find one better.

    My battery choice leans toward Flooded Wet Cells. a pair of GC-2's can be had for around 200 total or less (Costco or Sam's will be less) hold 220 amp hours give or take 10, and are the very battery that converter is designed for. So long as you can access them for cleaning and topping off every once in a while they should last close to 10 years,,,,, Mine lasted 9.