|Item Weight||5.3 pounds|
|Package Dimensions||12.36 x 9.21 x 4.88 inches|
|Item model number||PM4 35A|
|Is Discontinued By Manufacturer||No|
|Manufacturer Part Number||PM4 35A|
|OEM Part Number||WF 9835|
|Cover Included||Battery Charger^Install guide|
|Vehicle Service Type||Street-sport-motorcycles, Marine-personal-craft, All-terrain-vehicles|
Powermax PM4 35A 110V AC to 12V DC 35 Amp Power Converter with Built-in 4 Stage Smart Battery Charger
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|Sold By||Available from these sellers||Boat and RV Accessories||Amazon.com||Amazon.com||Amazon.com||Amazon.com|
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AC to DC Converter, Battery Charger and Power Supply with Built-in 4 Stage Smart Charger. Unit plug into a standard 110/120Vac outlet with DC output via set screw style terminal +positive, -negative and grounding lug (when required). The built-in Smart charger automatically regulates output between the different charge rates of Bulk (14. 7V) Absorption (13. 8V) and Float (13. 2V) and with Reverse Polarity, Overload and Thermal Protection the PowermaxIQ PM4 Series provides High output, reliable, safe and clean DC Power. Great for use with RV's, Boats, Automotive, Car Audio, Off Grid Battery bank and anywhere you need 12Vdc Power with high amperage output. PowermaxIQ units also do DC to DC conversion for electric car application. Units can be wired in series and/or parallel to achieve high output if needed.
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The manual says it is a "100 Amp and 3 Stage Charging Option" on the front. Inside it has a section called "4 Stage Charging Option Description" which is very poorly written. What I can gather from it is that what they are calling the 4th Stage is a switch which you must manually access and then using a digital volt meter adjust to the value desired. That is worthless once the unit is installed as typical for an RV as it is usually inaccessible or at the best difficult to access. This may work fine if you don't want the stated functionality, but I am returning it and will purchase from another seller that clearly implements the automatic 4 Stage function.
I am going to report this product to the company. I cannot say anything (for now) about PowerMax, the company that makes this product, but if they do not back their products when I ask for a return, I will recommend on websites to avoid this company.
!!!!!!!***PLEASE******READ******UPDATE***!!!!!!! >>>>>>>>> 13 JAN 2018 <<<<<<<<<<<<
After calling PowerMax and explaining my situation, they were completely willing to fix the problem!! They were not only understanding, but they were very quick in sending (UPS 2-day) a new PowerMax replacement immediately! Totally impressed!! Would do business with this company in the future!! I respect people who stand behind their products!!
I will update in a few months as to the reliability of the product.
Thank You PowerMax for your exemplary professionalism and service!!! Company gets 5 Stars, 3 stars for product.
Top international reviews
This is an ADJUSTABLE 13.2v~16.5v DC converter with a built-in 3 stages charger. This means that the output voltage in fixed mode can be adjusted using a #1 Phillips screwdriver to turn the potentiometer and this adjustment will also be applied to the charging mode output (bulk will be increased or decreased and the other charging steps will be increased or decreased by the same amount).
This might seems like an ordinary thing, however if using 6v deep cycle lead acid batteries such as the GC2 type from Trojan, USBattery, etc, which requires a 14.8v (for a 12v configuration) charging voltage at 25°C ambiant and then a significant increase/decrease in charging voltage as the battery temperate moves away from 25°C ( such as requiring 15.25v of charge at 10°C and 15.4v at 5°C), there aren't any marine or stand alone battery chargers out there (beside the expensive and short living inverter chargers or some solar controller) that can match those charging requirements.
This converter is the perfect match to provide an accurate charge voltage and offer almost enough output (80a out of an ideal 120a) to match the charging power of a 900ah battery bank (4 parallel strings of 2 series 6v batteries) giving up to 20a of charge per string and since you can adjust the output voltage freely, it is possible to compensate for voltage drop in case your cable run is either too long or undersized, and then to also perform equalizing by being able to pump the voltage up to 16.5v under load (my batteries needs 16.2v at 25°C, and 16.55v at 10°C).
Now the little downsides or improvements would benefit are :
A 5/16-18 power stud instead of a mechanical set-screw lug would go a long way into making installation faster, more secure, sealed and versatile, as the lugs are barely big enough to take a 2 AWG fine stranded type 3 wire (takes a lot of patience to fit the cable without strands catching and sticking out) and that so the sake of voltage drop at such high amp, one would be expecting to use at least 3 AWG and up. Then being able to make a bolted connection with sturdy cable lug and sealed heat shrink is much more reliable than exposed strands molested by a sets crew in a marine or vehicule environment. A power on/off switch on the unit would be great too to prevent sparking or arcing when plugging the unit under load as well as leaving it plugged when not operating. The potentiometer adjustment is very sensitive, having a slower moving range would make adjustment much more faster (for temperature compensation when charging).
Regardless, this unit is well priced and the staff at PowerMax were very helpful over the phone in answering technical question about their product prior to purchasing. I hope the build quality will be enough to last a few years, without any long term expectations. Upon inspection of the inside, thermal paste and wicking screw glue where used most everywhere. The temperature controlled fan moves enough air to keep the unit from burning up.
Update on January 2nd : after running down my house batteries to about 50% capacity during the holiday parties on the yatch, I proceeded to charge them back and ultimately equalize them only to find out that the converter won't output more than 80a even when the batteries could be using over 120a of charging current. That being said, I was using a 15.4v fixed output and I suspect that the 100a output rating is limited to the 13.6v nominal rating as there is no other indications or rating available on the unit or the included owner manual. Even more, there are no input power ratings other than 110v-130v AC. No mention of nominal power or current rating. Further more, and maybe this has to do with using a standard generator to power the unit with 115v AC 60Hz and not a generator inverter that provides a cleaner sine wave 60Hz, but the converter was pulling 15a and more when running at full capacity, and for an extended period of time (several hours). And despite pulling almost 1 800w from my genset, I was barely getting 1 200w out of the unit. That's over 500w of heat and apparent power that the unit is wasting. The power factor of this converter is most likely low and could use a capacitor to rectify it's power consumption, but what has me worried is the undersized wiring on both input and output, as both ends were dissipating a lot of heat during normal use (using a Flir E8+ Thermal imager). This unit should be made with a 12gauge power cord and 20a plug or at least require hardwiring since a standard 15a receptacle (especially a gfci one) will produce a lot of heat. Same thing for the DC output, even though 2 gauge wire with a 105° rating is good for up to 200a when not bundled and below 30° ambiant, it will heat up to 10° above ambiant and that's the best case scenario. So once again, this 100a converter should have accommodations to use much bigger wiring. Lastly, the fan blowing hot air directly on the output cables sure doesn't help, but can be addressed with a simple deflector shield along the cable. If uou plan on running this unit at full output for more than a few minutes, definitively hardwire it with 12gauge on a 20a breaker to stay within the 80% duty (federal law) and be careful about your DC cables overheating when they run trough walls or doesn't have a 1" clearance around them (like running them together or in between equipment/structures). And you will need to have forced air movement of mounting inside a cabinet or where air cannot be renewed easily, as this converter will generate a lot of heat (enough to raise a 30"x30" open top cabinet to 30° C above ambiant).
Bottom line, I was expecting an advertised 100a output and a compliant max input power, so it's a fluke on both ends, but the unit does appear to operate properly in term of holding a steady output voltage and cooling itself even under max load for several hours. I was hoping to get the batteries recharged much faster, but it looks like I'll have to get another 100a unit in parralel if I want to achieve a steady 120a output without having the power input overheating. This knock a star off my initial review since it didn't not perform as advertised or at least from the few specs available.
Installation was easy. check the net to confirm your wire size based on amps and total length needed. Connect to batteries and plug it in. That's it.
After watching voltages for a few days, I was able to confirm it is a four stage charger. I think the labels and instructions ( and listing picture) are for a older 3 stage charger that has been upgraded.
Final thoughts is that I would give it one star for confusion and literature, but once you get past that the performance and price required me to give it a 5 star. So I would recommend.
I purchased this unit as it was rated very highly on several websites when compared to other 55 amp charge converters, but unfortunately my experience with this unit was disappointing. It worked fine for the first two weekends we camped and topped up batteries afterwards ( we do have a 400w solar setup so the demand wasn't high on the charger on our return as it was sunny) but when trying to charge 4 6v Trojan T-105 batteries from 77% charge level it died. It managed to get up to 92% charge then blew a fuse and had a burned wire smell 2 it. It was quite warm when I disconnected it.
I let it cool down and installed fresh fuses the following day, but they blew as well. I've tried emailing PowerMax but they have not responded over the last 6 days. My experience with Customer Support seems to be common as others have noted a lack of response to their issues as well.
That was a waste of $200, now I've ordered a Progressive Dynamics PD9260CV. I hope that experience will be better. Another $300 bill, its a gamble I guess as I've read mostly good things but some mixed reviews.
good luck and I hope your experience is better than mine of you choose this unit
It works good. A word of caution this charger uses 15 amps right on the nose. It might be wise to put in an outlet and breaker that is 20 amps so that it doesn't trip on you. I've had that happen a couple of times. It seems to be on a 30 minute timer for max charge and then eases down. Uses 1800 watts for the first 30 minutes and then around 1500 (IIRC) watts after that for charging.
I used 4 AWG cable for the 12 volt portion. Cable gets a little warm but not uncomfortably warm to the touch. The inlet cable (120 volt) doesn't get warm either. I suppose the fan is a little loud but I'm sure my plants don't mind the noise. Not even much heat leaving the charger with the fan on.
A bulk charge at 14.6 volts, and then drops down to 13.6 volts, then down to 13.2 volts. The 4th stage is a selected fixed voltage.
The unit has a switch on side to select between fixed voltage and multi stage charging, it also has a pot meter to adjust the fixed voltage from 13-16.5 volts.
Rock solid power supply
Easy to install. Nice little bonus LED indicating unit has power.
These should be considered for any older RV with single voltage output for battery tending, this upgrade WILL dramatically increase battery life. (properly charged batts will last a lot longer!)
I am using them to power a 12v DC stereo system I have set up in my workshop.