Progressive Dynamics PD9105V Lead Acid Battery Charge Wizard

• Size: 2 inchL x 2 inchW x 3/4 inchH
• Cable Length: 6 feet
• Feedback: Charge status indicator light
• Activation Switch: Automatic with manual override button

This wizard works great and is absolutely easy to install provided you know how to use a small screwdriver and plug it in.

I love how it conditions my RV batteries and will help extend their live. I couldn't be happier with this product and my only complaint is that it should have been stock with my RV charger ;-)

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Like so many others, our 2004 motorhome came equipped with the "dumb" (set voltage) charging program built into their standard converter, which provides 12-volt DC current to the coach when plugged into shore power as well as charging for the house battery bank.

When I had to replace the house batteries recently I decided to go for Trojan T-105's, and wanted to provide a better charging profile to help them work better and last longer. Our camping experience to-date had not supported a need for an inverter (which typically come with an advanced multi-stage charging program), so I was curious about an alternative to just buying a new "smart" charger.

Progressive Dynamics offers this line of "Wizard" plug-ins as an after-market application to enhance the charging capability of their popular converters (why, for such a relatively small expense they don't just make it part of the OEM package, I have no idea...I guess the RV builders just prefer to trim the few extra bucks from their building costs). Plugging it into a port in the converter changes it from a single stage charger to a three stage, with a "float" mode and a "boost" and "desulfation" mode (the last kicks in for 15 minutes every 21 hours).

The charging profile does not exactly match Trojan's recommendations, but it's a lot closer than the stock converter. Hook-up is plug-and-play, but the plug is fairly large, so, like in my case, because I wanted to mount the Wizard inside the coach, I had to cut the plug off and then splice it back on to prevent having to drill overly large holes in my cabinetry (and the cord is only about 36" long). But with the device inside, I can monitor the tell-tale diode that blinks at different rates to let you know which mode the charger is using, and if I feel I need to manually change to a different charge rate, I can do that with the button on the face of the Wizard.

Again, not perfect, but a pretty convenient (albeit compromise) solution for a little bit of cost.

As a footnote, over the winter I left the motorhome at a campsite in Florida, where it sat plugged in but unattended for a couple of periods of 3 and 4 weeks at a stretch, and when I got back the batteries were fully charged and had not lost a measurable amount of water. That's not too bad, in my opinion.

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Installed this last winter, simple installation and seems to be working as advertised. Previous owner of RV said to disconnect the batteries when not using it or they would boil and go bad. Since installing I keep them hooked up and the RV plugged in 24 / 7 with no issues.

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Great product . . .does exactly what it says it will do. Saved the cost of purchasing a new (and more advanced) charger/converter. For the price, I can't understand why Progressive Dynamics does not just build it into their 9100 series chargres/converters. EASY to install . . . just remove 1 screw, plug it in, and replace the screw.

Fast shipping; as described; good packing. One problem is that the CW has a non-detachable plug many times larger than the cable; if you want to thread it through a 1/4" panel hole, then you need to cut and re-splice the cable. I would have loved to X-ray the sealed case, as I suspect that all the CW contains is a switch and an LED, which would make it rather over-priced. Still, it's nice to have a blinky light that remotely tells you the charger is really working.