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Questions & Answers
Yes it will charge 2 12 v batterys and it is a good cheap unit that works as not all do.
By John R. on March 1, 2018
You can attach an indicator light to show the charging. We think it is optional.
By Rosalie S. on September 15, 2017
You can charge two 12 v batteries connecting both baterry on battery post.
By Semi on March 2, 2018
The unit I got does use 0.05A constantly for the lights even overnight doing some "draining" of the battery. If the battery/system is a small one like 20AH battery or less (and 30 watt solar panels) that may seem like a drain on it, yet if you're charging bigger batteries like 50+AH with 100+ watt panels it shouldn't … see more The unit I got does use 0.05A constantly for the lights even overnight doing some "draining" of the battery. If the battery/system is a small one like 20AH battery or less (and 30 watt solar panels) that may seem like a drain on it, yet if you're charging bigger batteries like 50+AH with 100+ watt panels it shouldn't be that significant. The load light will stay on allowing power to go to the "load" connection until the battery voltage drops to 10.5V, then the controller cuts that off (to stop further drain on the battery which can damage it). Since your question was cut off (I know they limit the length), feel free to add comments to add details or other questions you have. see less
By Thomas H. Lawler on June 25, 2017
I've hooked up a drained battery to my truck and had a 50 amp breaker pop (showing how much power can go between batteries), so there's no way I'd use something rated for only 10 amp between such (unless you have some way of being sure you'll never have over 10 amps current flow thru it).
By Thomas H. Lawler on June 13, 2017
I wouldn’t buy this item again
By Mike Z on July 22, 2018
you can purchase a 10 amp or 20 amp model either will work.
By Clark Howle on June 29, 2018
I did and didn't see an over charge condition. You should see the battery charge to about 12.2 - 12.6v when fully charged. When the controller is charging you should see about 12.5 - 13.5v. I have been using this one for about 1 year and it works great for me. The only thing I have found is that I don't get is... it do… see more I did and didn't see an over charge condition. You should see the battery charge to about 12.2 - 12.6v when fully charged. When the controller is charging you should see about 12.5 - 13.5v. I have been using this one for about 1 year and it works great for me. The only thing I have found is that I don't get is... it doesn't show all bars being charge but I thought it is because I'm using it with a 5w solar panel and not enough sun hours last winter. see less
By David on May 14, 2018
Ok, so what is the voltage of the panels you have? You cannot test inline voltage in this case. You can test the battery voltage separately, but NOT the entire system through this box. You have to test the voltage on the Light Bulb side WITH putting your test instruments in circuit between the bulb and the unit connec… see more Ok, so what is the voltage of the panels you have? You cannot test inline voltage in this case. You can test the battery voltage separately, but NOT the entire system through this box. You have to test the voltage on the Light Bulb side WITH putting your test instruments in circuit between the bulb and the unit connection on the Red side to test the DRAW of the light bulb. You can test the voltage from your panels if it is a 12V panel then the out put should be 12-18V which is the normal voltage from the panels. The concept if you are not familiar is that in order to charge a 12V battery (which at full charge is really 14V), you need to have panels producing from 14-18V in order to CHARGE it... as it require MORE V than what the battery is in order to PUSH in charge. It doesn't matter how many volts are coming out as it only matters that it is within range of 12-18V as the real test is the DEMAND that you are asking for i.e. is the device 12V then it can handle up to 14V and it will NOT draw any more even if feed 20V. Also, realize just in setting up any solar battery situation, you will loose up to 25% in the fluctuation of the voltage from the sun as it is NOT constant Solar power is more like drops of water it drips into the bucket over time and the battery when it is full contains the push power like a bucket to power a device. That is why you need the battery to run a device to stabilize the output and make it consistent enough to run motors etc. So, again, recheck your voltage and configuration on your panels? If you are hooking them up Parallel then you are connecting the + to the + and the - to the - so if you have 2 panels each producing 12V and 4 amps each you would end up with 12V and 8 amps. If you are hooking them up in Series then you ADD them or 12V + 12V = 24V and 4 amps. So do you see the relationship if you up the voltage by adding them together in Parallel you reduce (or half) the amperage... if you simply add the like electrodes together it remains the same 12V and doubles the amps. Go to Images on Google and search for Parallel Batteries and you will see what I am talking about. So, which do you want 24V or 12V as I believe this charge controller knows how to deal with both. This unit is very simple and graphically labeled. I believe that the order of hook up is also important from the gentleman below Thomas H. Lawler. see less
By Leseagle on May 1, 2018
The correct answer is NO. Why? Because Lithium Ion batteries have tighter voltage tolerances and the absence of trickle or float charge at full charge. While lead acid offers some flexibility in terms of voltage cut off, manufacturers of Lithium Ion cells are very strict on the correct setting because Lithium Ion's can… see more The correct answer is NO. Why? Because Lithium Ion batteries have tighter voltage tolerances and the absence of trickle or float charge at full charge. While lead acid offers some flexibility in terms of voltage cut off, manufacturers of Lithium Ion cells are very strict on the correct setting because Lithium Ion's cannot accept overcharging. This charger works great for lead acid batteries. However, I would advise against using this for Lithium Ion's. see less
By Anthony on April 16, 2018
Please note that TOMTOP Forums are a community for all communicating and getting help each other. There will be some enthusiastic friends participate in your discussions. Of course TOMTOP customer service (with tomtop customer service icon) response is guaranteed ,which is the same way you contact us at http://www.tomtop.com/contactsopen this forum in full page
based on 204 Customer Reviews
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December 22, 2017
By Bill N Ochinero
December 18, 2017
By Robert LaMott
December 14, 2017
By Goat People
December 9, 2017
Good product the led display helps monitor and keep my back up battery ready to go. For the price yes No it is not for a full blown solar system but works well on back up power system I use. Yes would have liked different out put adaptor but any DIY experenced person can make their own to solve that issue.
By Edgar E. Duvall
December 7, 2017
By Crazy Craig
December 5, 2017
November 30, 2017
By JESSE ONEY
November 29, 2017
By Raymond D. Grosser
November 29, 2017
I rated this at a 4 because 2 out of six I bought originally did not charge the battery in my solar powered large scale railroad signal system, however they are not expensive so I didn't whine to the MFG, besides they come from the Chicoms and I decided to not be bothered. They work well when they are working and I now have a couple of spares in case someone figures out how to fix one. I am satisfied with the product.
November 18, 2017
my solar panel is 30 watts and this is 10 watts is that OK? i hooked it up to everything and nothing died . that,s a success. I'm using a 12V car battery, fairly new it powers my Sirius XM radio and the battery charger I keep it in my Honda 2000 Odessy also I could jump my starter if the primary batttery goes down.. how handy! JMT
July 28, 2017
July 26, 2017
By Earl Floyd
July 26, 2017
By Brian D
July 24, 2017
July 20, 2017
July 13, 2017
By Kim L. Rozell
June 27, 2017
Needed a way to regulate the voltage to my Solar Powered Attic vent system. Works perfectly! I substituted a bank of high capacity capacitors in place of the battery and it regulates the voltage just like it was a battery. This is the ideal Charge Controller for small solar projects. I like it.
By Steve Eligoyo
June 12, 2017
Custom Built a wiring harness for it. Bought ring terminals to fit in those grooves by the screws, then drilled the screw holes with a 5/32" titanium drill bit. Warning: drill halfway through both sides. It'll get caught in the bit and pinch your fingers if to don't. Good for small battery apps.
May 25, 2017
By James M. Price
April 18, 2017
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