Sunforce 60032 30 Amp Digital Charge Controller

by Sunforce

Product Features

• Charge controller prevents overcharging of 12 volt batteries
• Intended for use with 12 volt solar panels
• Handles up to 30 amps of array current and up to 450 watts of solar power
• Continuously displays the charging current or battery voltage on the LCD digital meter
• Automatically indicates the charged condition of your battery on the LED bar graph

Product Details

USA Sun and Wind Map [150kb PDF]

• Product Dimensions: 4.2 x 7.2 x 2 inches
• Shipping Weight: 1.2 pounds (View shipping rates and policies)
• Shipping: This item is also available for shipping to select countries outside the U.S.
• ASIN: B000FIWKQE
• Item model number: 60032
• Average Customer Review: 4.2 out of 5 stars  See all reviews (34 customer reviews)
• Amazon Best Sellers Rank: #2,872 in Automotive (See Top 100 in Automotive)

Product Description

Amazon.com Product Description

The Sunforce 60032 30 Amp Digital Charge Controller prevents overcharging of 12 volt batteries. It is intended for use with 12 volt solar panels, and can handle up to 30 amps of array current and up to 450 Watts of solar power. The controller will continuously display the charging current or battery voltage on the LCD digital meter, and also automatically indicates the charged condition of your battery on the LED bar graph. The 60032 is designed to work with a variety of 12 volt solar panels for indoor use.

Key Component of a Solar System Over 15 Watts

A charge controller is a very important feature of a solar system and must be used on all systems over 15 Watts. A charge controller protects your batteries from overcharge and discharge. Charge controllers are the maintenance free protection of your solar panel and batteries.

A charge controller monitors the battery’s state-of-charge to insure that when the battery needs change-current, it gets it, and also insures the battery isn’t overcharged. Connecting a solar panel to a battery without a regulator seriously risks damaging the battery and potentially causing a safety concern.

Charge controllers are rated based on the amount of amperage they can process from a solar array.

Product Description

The Sunforce 60032 30 Amp Digital Charge Controller prevents overcharging of 12 volt batteries. It is intended for use with 12 volt solar panels, and can handle up to 30 amps of array current and up to 450 watts of solar power. The controller will continuously display the charging current or battery voltage on the LCD digital meter, and also automatically indicates the charged condition of your battery on the LED bar graph. The 60032 is designed to work with a variety of 12 volt solar panels for indoor use.

Customer Reviews

Most Helpful Customer Reviews

139 of 143 people found the following review helpful:

4.0 out of 5 stars The two types of charge controllers / what is MPPT?, May 13, 2010

By 

HMMWV "God, Country, Corps" (santa clara, CA USA) - See all my reviews
(TOP 100 REVIEWER)    (VINE VOICE)   

Amazon Verified Purchase

This review is from: Sunforce 60032 30 Amp Digital Charge Controller (Misc.)

If you've read the reviews, by now the acronym MPPT has shown up more than once. If you know what that means, read no further as this is not too entertaining. If you would like to know the difference in MPPT and non-MPPT solar regulators, and can tolerate some basic math or skim through it, read on and I can explain why this non-MPPT regulator will do the job, just not the BEST job possible.

MPPT stands for Maximum Power Point Tracking, which sounds like a good thing, and it definitly is a must for large house size systems, but what exactly is it? Simply put MPPT finds YOUR solar array's Maximum amount of power for a given condition (full sun/overcast/panel tilt). It is always searching for the best voltage and current conditions to maximize power from the panels, which after all is what you paid big bucks for, right?

Let's explore how MPPT works. Normal power regulators like this one interface between the solar panel array and the storage battery. When the battery is full, they quit charging to protect the battery from boiling the electrolyte away. Pretty simple. But what if you need more power from your solar panels than the simple case? It turns out that MPPT can, using more electronics and some intelligence, harness more power from your solar arrays than a simple on/off charge regulator. How? by using a small IC chip that searches for the highest POWER from the panel, hence the name maximum power point tracking. The tracking just means that as the sunlight changes, so does the maximum power location.

Unfortunately Solar Panels are not just a source of simple DC power - that is they don't behave like a battery does. The fewer amps you draw from the panel, the higher the panel's voltage across the wires becomes. This is where most MPPT discussions end but with a couple simple equations (ohm's law) we can dive deeper into what MPPT does and why its good (and costs more).

Ohms law is really simple: there are two parts: Voltage = Current times Resistance (V=I x R)
Of course we can re-arrange it other ways: R = I/V, I = V/R Where I is in amps, V in volts, R in ohms. If we connect a 1 ohm (R) resistor across a 12V battery (V) then solving for I must be 12 AMPs flowing through the resistor.

For POWER (one P in MPPT) we need to know another simple equation Power = Volts x Amps (DC version)
In the above example, the resistor is most likely a power resistor (i.e. big) because 12 volts x 12 amps = 144 watts which gets hot real fast. In this case, the 144 watts is a power point from a battery. They are simple since small currents do not make large swings on the battery voltage and we can assume it to be nearly constant when using large storage batteries. Solar panels are quite the opposite - their voltage changes with current change. With power being the multiplier of voltage and current, you can see how this function can be maximized, which is the aim of a MPPT tracker. So how do they work this magic? read on....

Finally we need to know a little about DC to DC converters, as they are the logic controlled core of the MPPT solar battery charger. True they don't convert DC directly to another DC voltage, but they are pretty efficient (97%+) by taking an input DC POWER, making a AC voltage from it much like an inverter would, then converting that AC back to DC again for their output to the battery. And they may alter the battery voltage depending on temperature for optimal charging or even change the voltage depending on how many cells you choose to make a battery array (e.g. 12V, 24V, 48V etc). They are flexible and always seek to get as much power from your solar array as possible and put as much power in your batteries until they are full. Some models take the remaining power from your array and produce AC to be sold back to the utility company, but not all have this feature. Big Solar systems can use 6000 watt DC/DC converters that have a 240 Volt AC output as well. They are not small or cheap but they do work.

How does MPPT work? Shine a constant amount of light on a solar panel so that it's output can be characterized. A "12V" panel isn't really 12.000 Volts. It may be 16-19 Volts if you put a digital voltmeter across its output terminals. This is known as it's Voc or Voltage, open circuit meaning zero current flows because the circuit is open. The compliment to Voc is Isc which stands for Current (I) short circuit. Very few devices can have the Isc measured directly, but for small (60W give or take panels) it is safe to put an ampmeter across the same two wires from the panel and know how many amps flow when the voltage is zero (it's zero because you shorted the wires with the ampmeter - the definition of zero volts is a short circuit) If you were to plot on the X axis of a graph voltage, from the two endpoints, 0 and Voc (say it's 19V) and on the Y axis you plot the multiplication of amps times voltage, which we know to be power, you will find a curve with a peak. The MPPT seeks to operate your solar array at that peak. Without MPPT, the voltage is more a function of the battery's state of charge (from 11-13.8V) and the current that flows is on the graph of your panel's power function for a given voltage. In other words, without the dc/dc converter logic and MPPT smarts, the battery is a big tail that wags the dog (solar array) - I have a plot of the MPPT lines in my review of the 60W sunforce array - its located in the photos section and plots how the voltage reacts to the current, and where the maximum power point is - for those panels it's optimal for charging 12V lead acid batteries so MPPT controllers won't pay for themselves but the graph is interesting to understand Voc, Isc, and the curve in between.

If all this electrical stuff is getting confusing, lets change the example. Think of voltage (V) as RPM from your car's engine. Now think of Amperage (I) as being Torque on the crankshaft. Work done is RPM x Torque. If either is zero, no work is done. And just hooking the crankshaft to the differential doesn't give you alot of options, so we invented the transmission which allowed us to get the most work out of th e engine no matter the conditions. MPPT is just an automatic transmission - it finds the peak RPM and Torque for your conditions (accellerator pedal, slope, tire size, etc) and gets the most out of the engine (panels) for any operating point. For 12VDC systems, you don't alwyas need a transmission - just hooking the output of the panel (crankshaft) to the battery (differential) will work. Granted it's oversimplified but the idea is the same - you want to find the peak in the curve (in the sunforce 4 panel set I actually plotted the I vs V curve over the panel's entire operating range - its in the photographs for that product, the sunforce 50048 Sunforce 50048 60-Watt Solar Charging Kit look at the black photo - it's got pink and blue lines representing the voltage and current you can get from the panel. Think of the graph as an engine plot and it makes better sense but the analogy still isn't perfect, just close.

A 16V, 30 watt panel might give you 33 watts at a particular voltage, or an extra 10% using MPPT. In other installations, wiring your panels in series for higher voltages may be where the maximum power is found. The chip inside the MPPT tracker searches for this peak in your system and operates the solar panel (or array of panels) at it's absolute maximum power, which is sent to the DC/DC converter to charge your batteries.

We might get 10-30% more power doing this, but the voltage will be all wrong for charging our battery, or our battery array. And that's where the DC/DC converter steps in. As a simple example, say you find that 2 panels in parallel give you 14.5V at 1.9A going through your non-MPPT charge controller, or 27.5W delivered to your batteries. Wired in series using MPPT they give you 37V at 1.25A or ~48W. You would get more power by wiring in series for a higher solar voltage of 37V, which is too high to charge a 12V lead acid storage battery. Now you need a MPPT.

The MPPT takes the 37V, 1.25A from your panels and gets ~48W, looses 2W in conversion inefficiencies(give or take) for 46W out, and converts it to 13.6V to charge your battery array at 3.38A [45.96W] whereas had you wired the two panels in parallel you would get about 27.5 watts in this illustration.

MPPT systems are found in high voltage solar arrays (100V+) because the peak power points in these systems are up high in voltage and low in current. It has a second advantage - by running lower current through the panels, you can get by with smaller wire which lowers the project cost given the price of copper.

To sum it all up -

For really small solar panels, (1w) and big batteries (100 AH) you really don't need a charge controller just a diode to prevent backflow when the sun is down. Car battery mainters are made this way.

As you increase power and run the risk of overcharge, some controller is needed. The cheapest is like the one sold here - the non-mppt which works well with solar panels that are close to the battery voltage and would not optimize much with MPPT.

And finally as you cover your house with solar panels, MPPT systems sqeeze every last drop of power so long as you operate them within their specified parameters (often limits on voltage and current comming in or watts converted) Outback is a major MPPT converter which can handle a VERY wide range of input voltages and run a grid-tie system with or without batteries. As for 4 stars - you can buy MPPT trackers about this size for $112 now.

69 of 73 people found the following review helpful:

3.0 out of 5 stars Affordable but not efficient, November 1, 2008

By 

Andy Baird "-------" (Princeton, NJ US) - See all my reviews
(REAL NAME)   

This review is from: Sunforce 60032 30 Amp Digital Charge Controller (Misc.)

The Sunforce #60032 controller is a decent product at a reasonable price. Unfortunately, it doesn't include maximum power point tracking (MPPT) technology, so it wastes about 15-25% of the incoming power, especially at times of low solar input (which of course is when you need it most). To be fair, no charging controller that I know of in the under-$100 price range has MPPT, so I'm not knocking the #60032's value--just pointing out that if you're planning on spending the money for hundreds or thousands of watts of panels (like one recent reviewer), it probably makes sense to spend another hundred bucks and get an MPPT controller (e.g., Blue Sky or Heliotrope models) that can milk the maximum power from that expensive array... instead of throwing away part of it, as this unit does.

30 of 30 people found the following review helpful:

5.0 out of 5 stars Will keep your battery at the pefect level, May 30, 2009

By 

Tim G "The KOBK" (madison) - See all my reviews

This review is from: Sunforce 60032 30 Amp Digital Charge Controller (Misc.)

When I hocked this up I instantly started ruining some tests to see exactly how well it works and after some tweaks I can tell you I am very happy and recommend this to any one that wants to keep there battery's healthy.
This thing will automatically throttle up and down the current to any battery to keep the voltage exactly were it belongs. The only had 3 problems with mine.
1. The voltage meter was off by +.2 volts!
2. The amp meter was off by -600ma!
3. This is not a mppt controller and wastes about 1 amp in my set up but for the price that is not bad.
Both points 1 and 2 were easily fixed by tweaking 2 pot's inside that are very easy to get to.