Marine Inverter-Chargers Test Part 2

Practical Sailor evaluates eight products charger functions and taps two as top picks among the double-duty devices.


The February issue launched our evaluation of marine inverter-chargers with a look at the inverter capabilities of devices from six manufacturers. This month, we compared the battery charger functions of the multi-tasking tools.

In Practical Sailors Oct. 15, 2002 review of dedicated battery chargers, we discussed the advantages of “smart charger” technology. Without question, the constant rate, Ferro-resonant transformer-based battery chargers of the past are rapidly fading into history-as well they should. Those early chargers were problematic and lacked sophistication, which led to the destruction of many a battery. That is certainly not the case with todays “smart” chargers.

Marine Inverter-Chargers

Photos by Ed Sherman

Why the Need?

Battery technology has seen some major shifts in the last decade. These days, its difficult to find a battery with serviceable cells. Whether its a flooded cell, gel cell, or AGM battery, increasingly the cell caps are fixed, meaning that periodic checking of electrolyte levels and replenishment of dry cells is becoming a thing of the past.

On the surface, this is a wonderful evolution that eliminates at least one periodic maintenance hassle, but it puts some important burdens on the charging system used to reverse the electro-chemical reaction that occurs as part of battery discharge. The chemical reaction that occurs during charging is quite violent and still produces some gassing inside the battery. Plate chemistry has brought gassing down to a minimum under normal charging circumstances, but gas is still generated as a part of the process.

Contrary to popular belief, todays “sealed” batteries are not totally sealed. They are properly referred to as “SVR,” or sealed valve regulated. Under normal charging conditions, they are sealed, but if cell pressure exceeds 1.5 PSI, a check valve will open, and the excess pressure will be relieved. If this condition, which is caused by an over-charging situation, continues, the cell will eventually dry out, increasing the risk of a battery explosion. Remember that in spite of all the chemical “tweaking” thats occurred over the last 10 years with battery technology, they still can generate explosive hydrogen gas in an overcharging situation.

The bottom line is that modern batteries must be re-charged by properly calibrated, multi-stage chargers, preferably those with temperature monitoring.

What we Tested

The chargers in this test group are all very sophisticated-they have to be to accommodate modern onboard battery demands and technologies. In the last five years, battery chargers have consistently gotten smarter as charging-regimen algorithms have gotten more precise and in general, the needs of modern battery technology are easier to meet than ever.

Marine Inverter-Chargers

We tested marine inverter-chargers from Charles Industries, Magnum Energy, Mastervolt, ProMariner, Tripp Lite, and Xantrex. Newmar and Xantrex recently released new units that were not yet available when this test began; we plan to test these in a follow-up report.

Charles IQ-2600

The Charles IQ-2600 is not a new design. In fact, it was included in our 2005 inverter test group. Although it did have the highest maximum rated output of our group this time around, it was also the most expensive test product.

If you add in the optional remote monitoring panel-which we categorically recommend for all battery chargers and inverters-its priced at over $3,700, more than $1000 over the closest price competitor in the test field. It also has the shortest warranty period at 1 year.

The IQ-2600s programmability is quite limited as well, using fixed-value dip switch settings with course settings only available for gel-cell and flooded-cell batteries. There is no fine tuning voltage outputs on this unit.

The IQ-2600 had the second highest AC ripple reading at 0.347 volts AC.

Although its heavy weight, almost twice that of its competitors, may account for its historic reliability and higher output, we think its time for a new design with more consideration for where we are technologically.

Bottom line: If youre still using conventional flooded-cell batteries with removable caps and serviceability, this may be a good choice.

Magnum MS2000

Relatively new to the marine market, the Magnum MS2000 has some strong attributes on the battery charger side. Testers really liked the single-knob programming on the remote panel as it allows infinite programming capability and precise adjustment of the charging regimen for flooded, gel, or AGM battery technologies.

Testers would prefer that the $230 optional remote panel was standard, but we do understand that in some applications, it may not be needed. Having optional add-ons allows consumers to customize a package based on their needs.

Our AC ripple test demonstrated that the unit has some excellent filtering in its output.

Bottom line: With a three-year warranty and its true-sine wave inverter output, the MS2000 is a good option for an inverter-charger in this power and charging range.

Magnum ME2012

In terms of its charging capability and functionality, the ME2012 is totally on par with its MS2000 sibling. We did notice, however, that the AC ripple test showed one of the lowest levels of AC leakage in our grouping at 0.023 volts AC-compared to the MS2000s 0.147 volts AC leakage. They both perform beautifully and are quite acceptable for anything out in the field today, in our opinion.

Bottom line: The ME2012 is only $120 less than the MS2000, so between the two, wed opt for the additional functionality of the true-sine wave version.

Mastervolt Combi 12/200-100

Marine Inverter-Chargers

The Mastervolt Combi 12/200 impressed us in many ways. It was the lightest unit, which can be attributed to its high-frequency transformer design, which the Xantrex ProSine 2.0 also uses. It was also one of the quietest in terms of EMI and RFI emissions, again, partially attributable to the high-frequency transformer at the heart of the unit.

The Combi 12/200 includes a standard remote panel and offers an optional deluxe panel for more advanced systems utilizing power sharing and to monitor AC loads when in inverter mode. It also includes a standard battery temperature sensor, an important feature.

At $2,599, it was the second most expensive in our test group, but that includes the remote panel, temperature sensor, and its handy paralleling capabilities in inverter mode.

Because of this units European heritage, many of its dip-switch settings deal with issues related to global power differences and frequency variations. The course settings for battery technologies identify gel, AGM and AGM spiral, flooded, and what Mastervolt describes as a “traction battery.” To most Americans, this is what we generally refer to as a deep-cycle battery. Fine tuning for battery maker-specific voltage requirements can over-ride the dip switch settings and can be achieved from the remote panel or via the free “MasterAdjust” software and built-in computer link port. Adding this software to a boat already equipped with a PC will enable the operator to monitor charging and inverter functions from the PC.

Our AC ripple tests put the Mastervolt Combi at a mere 0.013 VAC ripple. Exceptionally clean, this level of ripple wont affect even the most finicky of batteries.

Bottom line: The Mastervolt Combi 12/200-100 is the most sophisticated inverter-charger in our test. It performed flawlessly and gets the Practicla Sailor Best Choice pick for an inverter-charger in this range.

ProMariner Combi 2500QS

The ProMariner 2500QS had the lowest maximum current rating of the chargers we compared at 50 amps, which will increase charge time. It does have remote-panel capability as the on-case panel can be removed and mounted remotely, a cost-saving feature that we liked. A remote battery temperature sensor is not available, a serious drawback, in our opinion.

It measured very low AC ripple in our tests, which is a plus. The 2500QS offers only fixed-value programming for the charging regimen, but it does offer some unique features in this area.

The above photo of the unit shows settings for two gel-cell, two AGM, sealed flooded, traditional flooded, and Calcium batteries. (Lead and calcium apply to many sealed battery types and have specialized voltage requirements.) These are fixed values, but based on our survey of the various battery manufacturer recommendations for voltage settings, careful selection here should get you what you need to maximize battery cycle life.

Marine Inverter-Chargers

The recondition setting is equivalent to the “equalization” phase discusses in “How We Tested” on pages 14-15, and we do not recommend its use on anything other than a traditional flooded battery, and even then only rarely.

Bottom line: With a $1,300 price tag, the 2500QS is one of the least expensive tested, but it also was one of the noisiest, in terms of RFI and EMI emissions.

ProMariner Combi 2000PS

For $100 more than the 2500QS, the ProMariner 2000PS offers pure-sine wave functionality and a 70-amp charger, but its peak output is 500 watts less than the 2500QS in inverter mode. So there are pluses and minuses in terms of specifications when comparing it to its ProMariner sibling.

The unit offers the identical charger functionality as the 2500QS in terms of programming. We also found the 2000PS to be quite noisy in our EMI and RFI emissions testing. AC ripple was extremely low at 0.070 volts AC, but it is in all other respects, identical to the Combi 2500QS already discussed.

Bottom line: The ProMariner Combi 2000PS is held back by its noisy performance in the emissions tests.

Xantrex ProSine 2.0

The Xantrex ProSine 2.0 is not a new design, but it was a bit ahead of its time when it first came out, and it remains a solid contender today.

Like the Mastervolt Combi, the ProSine is lightweight compared to all the other units tested. It comes with a remote panel, and its $1,900 cost is in the middle of the pack. The unit has a maximum charger output of 100 amps and comes standard with a battery temperature sensor.

In terms of emissions, it is one quiet unit and needs only about 12 inches of separation from other electronics to eliminate magnetic field interference.

Like the ProMariner models, the ProSine also recognizes PbCa (Lead/Calcium) battery technology in its default programming modes for battery charging regimens. But unlike the ProMariner units, the ProSine offers a more detailed and infinite level of adjustment via its remote panel-a very useful feature for fine-tuning specifications to exact battery maker requirements.

Xantrex plans to slowly phase out the Prosine 2.0, starting in 2011. It will be replaced by the Freedom SW2000, which we plan to review once its launched.

Bottom line: The ProSine 2.0 offers all of the features we consider desirable in an inverter-charger and does a great job delivering them. Its among the less expensive top performers we tested, and the fact it will be phased out means buyers can likely find a good deal on one in the upcoming year. It gets the Practical Sailor Budget Buy nod.

Tripp Lite MRV2012-UL

The least expensive of all the test units at just over $1,100 (with optional remote panel), the MRV2012 is also fairly unsophisticated compared to the others.

It does offer an available battery temperature sensor, but it only has default settings available for flooded-cell and gel-cell batteries.

We found the Tripp Lite to be a high emitter of EMI and RFI, so youll want to keep this inverter-charger as far away from sensitive equipment as possible.

Using conventionally wound transformer technology, the MRV2012 is among the heavier units tested.

Testers measured considerable AC ripple leakage at 0.374 volts AC, the highest in the group.

Bottom line: We could only recommend this unit for those on a really tight budget with otherwise unsophisticated needs in terms of battery technology and AC equipment to be run from the inverter side.


So where do we stand in terms of overall recommendations for an inverter-charger combined unit? Depends on your needs.

For those with larger AGM or gel-cell batteries onboard who are planning to expand their systems down the road, we would definitely recommend the Mastervolt Combi 12/100. It has a steep price tag, but it also offers a high level of sophistication in terms of charger calibration and output for a reasonably large bank of batteries. On the inverter side, its clean, pure-sine wave output and low noise make it a winner for high-level audio and video power supply systems. Also, don’t forget that as the boats systems grow, an additional unit can be easily piggy-backed on to double the power capacity.

If no major expansion is planned for the future that would require doubling capacity, the ProSine 2.0 offers the best combination of price, features, and sophistication, in our opinion. Its the best value in our eyes, and gets the PS Budget Buy pick among these inverter-chargers.

Darrell Nicholson
Practical Sailor has been independently testing and reporting on sailboats and sailing gear for more than 50 years. Supported entirely by subscribers, Practical Sailor accepts no advertising. Its independent tests are carried out by experienced sailors and marine industry professionals dedicated to providing objective evaluation and reporting about boats, gear, and the skills required to cross oceans. Practical Sailor is edited by Darrell Nicholson, a long-time liveaboard sailor and trans-Pacific cruiser who has been director of Belvoir Media Group's marine division since 2005. He holds a U.S. Coast Guard 100-ton Master license, has logged tens of thousands of miles in three oceans, and has skippered everything from pilot boats to day charter cats. His weekly blog Inside Practical Sailor offers an inside look at current research and gear tests at Practical Sailor, while his award-winning column,"Rhumb Lines," tracks boating trends and reflects upon the sailing life. He sails a Sparkman & Stephens-designed Yankee 30 out of St. Petersburg, Florida. You can reach him at