DC VOLTAGE CONTROLLER FOR SOLAR PANEL

Switch allows battery to be charged in the off position is a nice feature. Instructions for mono jacks are incorrect: it says the jacks all take a 3.5MM mono jack--when actually the 12V is a 1/4" mono jack, not a big deal. Great little unit.

2/6/2009, Works great. Output shuts down when battery drops below 11.5V to avoid discharge too deep. From there takes full day to charge back full (neighbor's tree blocks few hours in the afternoon). Beware of blown fuse(on the load side)!! In that case, the charging voltage might be too high with high sun.

As advertised. Great. Solar Instructor using for charging lessons. Used a Siemens 75W at 17Voc and 4.4Isc with no problems to charge 12v batteries from 1.3 ah to 33ah. Works great!! High School and Adults students used it with ease without the manual even. Charging circuit good. Red led flashes at a faster and faster rate as you reach Pmax. 14.7 peak charging voltage I measured with the Siemens 75W panel.
Buy if you need one!!!!

Taking Solar power to another Level.
After the success using the SOL4UCN2 with my Solar panels and Yamaha P60 in 2006.
I have a new Challenge for 2007.
Two electric motors for my Black Rose Beach Cruiser Chopper Bike. Extra Solar panels for each motor Total 4x Solar Panels + two SOL4UCN2.Voltage Controllers
The electric Motors have two 12volt 12 amp batteries in each motor.
If I was able to play all day long in the summer with One Set of the Velleman Briefcase Panels and a 12volt 4amp batterie.
In theory I should be able to ride this bike powerd by the sun all day long.
Ill follow up this review after tests.

I have yet to fully test this combination:
SOL4UCN2+ SOL8Panels + 12v 4amp batterie + YAMAHA P60 Piano.
I recently Toured Germany and Switzerland on a Street Performing Tour, with just the Solar Panels the 12volt 4amp Batterie and the Yamaha P60 many times I just ran out of batterie power and had to spend all day charging the batterie, In theory this device;(SOL4UCN2) should resolve this problem and give me continuouse play in Daylight, and enough charge in the batterie for evenings or late night performance. again I have to test this fully over a period of weeks both day and night, to give a real example of using the SOL4UCN2 combined with the other equipment. As soon as I have one will let you know.