This is a great charge controller that works and a super value under $30, it is only for 12V systems and is best suited for using up to 15 amps. So that is up to 200 watt output total for a 12V system. If you use it at the rated output (above the 15 amps) you need to cool the unit with an external fan running during the higher output. Note it does not exceed 26 amps and at that output it will not survive without a fan, for sure stay below 20 amps. You can run more than one of these charge controllers into the same battery bank at the same time allowing you to increase the total amps into the battery bank without risk of over heating the controller. Each controller must be connected as a stand alone unit to the battery bank as if it were one by itself, meaning do NOT have any interconnections between the controllers. You can have as many as you like so in theory you would have say 5 connected to one battery bank and easily have 75 amps feeding a battery bank with no risk of overheating. That's 5X$30=$150 for a 75 amp system! Also by doing this if one fails you are still up and running with 4 till you replace it.Read full review
Verified purchase: Yes | Condition: New
Works as anticipated. Great job for such a fair price. Still need more panels to reach the 500 watts max but so far is working excellent!
Verified purchase: Yes | Condition: New
I just set it up today and everything reads like it should, we are under very cloudy sky's so it will be a slow solar charge.
Verified purchase: Yes | Condition: New
The only thing that bothers me with this unit is that connections are different from those on the panel(s). Both are Thunderbolt.
Verified purchase: Yes | Condition: New
I did not like the way everything connects to this unit. You need to strip wires and insert them in a screw down. Does not come with any type of pigtail to connect with factory plug on Solar panel. I wasn't going to cut my factory plug off so I never tried the unit.
Verified purchase: Yes | Condition: New
My Renogy solar panels have large wires from off the roof. I could not get them into the connections on the charge controller. It works on my 45 watt small system but I wanted it to work on my 400 watt system.
Verified purchase: Yes | Condition: New
Works fine. Wish it had the features that were in the 100 amp controller to plug accessories into.
Verified purchase: Yes | Condition: New
Once we figured out how to hook it up, everything works just as stated. Gave it a 4 because it was difficult to hook up. Would buy again if needed!
Verified purchase: Yes | Condition: New
Buttons are hard to press. Need to press twice sometimes to scroll through menu.
Verified purchase: Yes | Condition: New
The said Thunderbolt Magnum Solar 500 watt Controller 68738 is a very good product for the money and for the management pertaining to using a 500 watt solar system, etc.
Verified purchase: Yes | Condition: New
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