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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?
  • Thanks for the input. It's good to know that I am on the right track and that all of the research I did on this system was accurate.

    We lived with the 30A charger for several years without any issues so I'm sure the 45A will serve us well, especially since, as you mentioned, we will be pretty much all solar from this point on. The only times we ever connected to 30A service before was in the summer, when it regularly tops triple digits here, we would run the AC with a 4k generator only while we cleaned up and packed up to leave. The other time is when we got home and parked it to charge the batteries. Now I won't even have to plug it in to charge.
  • Sounds like should be fine, couple of things to think of.

    LED lights if you are up at night in the fall - cheap upgrade.
    These are most of the ones I used, you do not have to get ones this bright.

    With 220 AHs of AGM you may want to consider a larger charger, the $delta for extra amps is not much. On the other hand if you plan on solar power only, as may be the case, then 45 AMPs should do.

    An example of prices.

    Note even with AGMs it will be hard to use that extra charging current unless you have a very low resistance to the batteries (something the stock setup likely does not have). This suggestion totally depends on your intended use.
  • I realize that the flooded cell 6v batteries are the best choice for longevity but since I know myself and know how I treated my last set of flooded 6v batteries, I think that AGMs might be better for my lazy personality. I have seen reports of plenty of folks why get 10+ years from AGMs while flooded cells, which should theoretically last longer, typically don't because too many people let them dry out. I'm one of those people.

    What do you know about any advantages of 6v AGM over 12v AGM though? Is there any?
  • 300 watts of solar should work great for you but I would go with four 6 volt wet cells instead of the AGM's.
  • Sounds pretty good to me but I'm no expert.
    My batteries are all 6 volt golf cart type. Have 4 of them for a 40 foot rig plus two large 12 volt for the engine/chassis.