Now, let's consider the intended use of this unit. It is NOT a high end solar/wind charge controller and it does not pretend to be so my rating is not comparing it to a MidNite Solar MPPT 250VDC 61A unit costing $700+. This is an inexpensive piece of Chinese electronics made for 4-stage battery changing in tiny-to-small PV systems. Based on everyone else's comments, it works fine when used within it's rated capacity and does not work when used outside of its rated capacity. Go figure. If like some comments indicate you have no idea what wire gauge to use given your voltage and resistance due to temperature and conduit run length, if you don't know to look at the NEC sections 310.15 310.17 to determine appropriate conductor ampacities, well... you may need to either do a little more studying (Photovoltaic Design & Installation for Dummies by Ryan Mayfield is a most excellent resource if read diligently and not a dust collector on a shelf), or pay someone who knows what they are doing to set up your PV system, or simply return your unit and cease talking about things you don't know about. DIY projects should only be undertaken by DIYers willing to perform due diligence research instead of purchasing mismatched components. If you smoke your inverter it is 95% probably because you screwed up, not because the inverter was mis-wired internally. Even diligent research may not be enough, but it is better than ordering things randomly and rating it a 1 without even knowing what wire gauge to wire it up with.
As for the product review: The controller is housed in a respectably thick plastic box with a metal backplate. As someone complained, yes it rattles when it is shaken. This is due to two things: the On/Off button (far right) rattles on the housing, and the wire connection panel (center bottom) which is attached to the circuit board rattles when no wires are secured. Neither of these are defects, it's just that this is made using inexpensive design (a spring would have stopped the On/Off button rattle) and the rattles of an out of the box unit are a by-product of that. When screwed into a plywood mounting board, nothing will be rattling. There are no loose parts in the unit.
This unit is made by an unknown manufacturer. HQRP purchases the units from the manufacturer, slaps an HQRP sticker on the unit face, and ships it. The packaging box does not even show HQRP anywhere. The take away from this is that this is a commodity item, purchased by many companies such as HQRP who put their own peel-off sticker on the housing. The brand is not really HQRP, the brand is China.
I certainly do not expect this unit to last long a few years at best. It has two 35A (or was it 30A?) auto-style fuses soldered directly onto the circuit board. If your unit ever quits working, remove the 4 back plate screws, then remove the 4 circuit board screws, and pull the board and check the fuses. It that's the problem, just use a soldering iron ($8 on Amazon) with rosin-core solder to replace fuses if necessary. Make sure the finished solder got hot enough to solidify smooth and shiny and not gray and grainy looking.
I plan on putting 20A fuses (what it's rated at) in front of the unit to insure they burn out before the 35A fuses inside the unit, and I'll gang my 24V panels appropriately to keep peak amperage under 20A.
My plan is to build out my PV system over years as finances allow. As a starter controller, this is a good choice given my current panel/battery setup. Later as I upgrade it can be re-purposed for my horse trailer or shared with my daughter for a science project or reboxed and shelved in a Faraday cage as a backup.
Compared to a "real" PV system component such as from MidNite Solar or Outback Power, this unit rates a 2. But that's comparing an apple to an orange tree. For it's niche, this is a nice little controller with a lot of good features. It does exactly what it is intended to do to provide an inexpensive controller/regulator functionality for a small 12/24VDC PV system. In achieving that goal, it deserves a 5.
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I bought this so I could expand my two panel system up to four panels. It appears to be working fine. The instructions were lacking but the diagrams on the unit give all the info needed. This unit does not have the auto on and timed shut off the 10 Amp units appear to.Best Deals for HQRP 20A Solar Panel Battery Charge Controller / Regulator 12V
This 20 amp controller is exactly what I needed for my Solar electric trike.I previously purchased an MPPT 15 amp controller that would trip out daily during my ride to and from work (about 1.5 miles one way) That was my poor shotgun guessing skills. When I did the math and found I was drawing 18 amps I saw my problem.
So far the unit has tripped once due to an undervoltage, this was after putting about 10 miles on the bike and then climbing a hill.
I've had this controller for about 3 weeks and have had no other issues.
Honest reviews on HQRP 20A Solar Panel Battery Charge Controller / Regulator 12V
The controller worked great, instructions really aren't necessary, there are symbols on the controller showing postive and negative for the solar panels, positive and negative to your battery, and positive and negative for a 12 volt light if you want to hook a light up to the controller. If all you are using this for is charging batteries, there is no need to mess with the programming. I tested for any drainage back towards my solar panels, there is no drainage at all. This should not be an issue anyways if the solar panel has internal diodes as most do. 2, 100 watt solar panels hooked up to this, charging at 8 amps under direct sunlight. Took about 3 minutes to wire into my existing system.Find helpful customer reviews and review ratings for HQRP 20A Solar Panel Battery Charge Controller / Regulator 12V
Well am from St. vincent (st.vincent and the grenadines), a small beautiful island located in the Caribbean. I've ordered some mixed solar cells (broken and whole) from ebay and built two homemade solar panels from them. I manage to get two old used golf cart batteries from my work place, wire em up in parallel (at first) and connect my panels directly to em they took charge yes but when its discharging i noticed the loads only lasted about an hour. I then did some research about the real need for a charge controller and found that mppts are the best over pwm but i dug a bit deeper and found that pwm type controller is best for my region cause there is no winter here, only sun and rain. Started looking for a pwm controller and based on other reviews i found that hqrp is the best affordable one (for me). I ordered it, got it, followed directions and connect it to my setup. Leave it to control the charging for a whole day uninterrupted, time finally came to test at night. Turned on my inverter with my 53w 14inch tv and the batteries lasted 2hrs and a few mins. The next day, 4hrs and more. I'm really pleased with this controller, works flawlessly. Building another panel to add to the setup.This is my honest and longest review ever written.
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