A: Before you buy, ask the seller about their warranty procedures. Does the retailer provide customer service or service department phone number? Due to the fact that we cannot guarantee that you are being sold a new product, any warranty issues should be handled by the retailer who sold the product. For further information regarding our warranty procedures call 1-800-730-2557, extension 234; email us at warranty@parallaxpower.com
A: Remote camping in a recreational vehicle in areas without shore power or in some cases a generator power source requires an electric power source (i.e. your 12v battery system). The power converter recharges the battery and supplies 12-volt power for the lights and appliances when 120–volt AC power is available. Most RV Manufacturers now specify Electronic Power Converter/Chargers.

Provided there are no other 12-volt systems operating and if the battery is discharged enough, the maximum rate the converter will recharge the batteries is the maximum amount of amps created by the converter. The last two digits of the part number indicate its maximum current capability in amps.


Maximum Output & Charging Rate 4400 Series Model 5400 Series Model
35-amps 4435/4435TC
45-amps 4445/4445TC
55-amps 4455/4455TC
65-amps 5465/5465TC
75-amps 5475/5475TC
90-amps 5490TC

Power Centers

Maximum Output & Charging Rate 7100/8300 5300
45-amps 8345/8345TC
55-amps 7155/8355/8355TC 5355/5355TC
65-amps 8365/8365TC 5365/5365TC
75-amps 8375/8375TC 5375/5375TC
A: When the battery reaches full charge, its internal resistance will stop, or resist the current being provided by the converter and current entering the battery is between 20 and 25 milliamps. Fully charged batteries will self-discharge themselves and will always accept some small amount of current to offset this self-discharge
A: The fan installed on your 4400/8300 series converter is thermostatically controlled and will only run when needed. The 5300 series models 5355 is also thermostatically triggered and will cycle on and off as needed. The 5400 series models 5465, 5475, and 5490 cooling fans operate constantly. Simplified 45 and 55 DC Ampere model fans are thermostatically triggered. 65, 75, and 90 DC ampere model fans operate constantly.

A: Parallax converters feature over current protection, short circuit protection, reverse polarity protection, and thermal shutdown protection.

In a short circuit, over current, or thermal issue the converter will shut down nearly instantaneously to protect itself. The converter will reset itself once the issue is resolved. Additionally, protection is also included to help protect your property and safety in the event of catastrophic failure which can be caused by liquid intrusion, etc.

A: Your new Parallax Power Supply converter is protected by a 2 year warranty from the date of original purchase, to the original owner. An extended warranty is available which extends your coverage for an additional 12 months.
A: These fuses protect the converter from damage in the event of a reverse polarity scenario. In the event the battery or batteries are connected backwards, the two 30A ATC fuses will blow to protect the converter. Before replacing a converter suspected of being inoperative, always check these fuses first! These are standard automotive type 30 amp fuses.

A: The issue we have with "smart charger technology" (when used in an RV) lies more with the application of the technology than the technology itself. In a typical RV 12 volt electrical system, the converter/charger and the battery or battery bank is connected in parallel with the rest of the 12 volt distribution system. In "parallel" means where the charging source (converter/charger) positive and negative output is electrically connected to both the battery bank positive and negative, and the 12-volt distribution system positive and negative, at the same time. The voltage output of the converter "smart charger" is based on a "detected" battery voltage. The converter "smart charger" claims to "monitor" and respond to battery condition while connected to the entire 12 volt system. Unless the charging source (converter) has a separate or isolated charging output, we do not agree that a converter or charger can effectively differentiate requirements of the batteries from other 12 volt loads while simultaneously connected to the rest of the 12 volt distribution system in the RV.

Detected use or voltage change on the RV 12-volt load system (i.e. lights, pumps, etc. being turnedon) generally keeps these devices at a 13.6 -13.8 "float" voltage. This raises the question whether any real additional benefit is being provided to the battery bank unless the coach remains in a "non-use" storage condition. If a converter "smart charger" is only connected to the battery bank and can therefore monitor only battery voltage or current, and is not also connected "in parallel" with the 12 volt distribution system, we have no problem with the application of "smart charger technology".

A: There are many people using Gel Cell and AGM batteries with our converters/chargers. We do recommend that the battery manufacturer’s specifications be checked to ensure that the batteries chosen have "float voltage" requirements consistent with the converter output float voltage which is 13.2 - 14.1 VDC. Using a Parallax converter with patented TempAssure capability will enhance the charging function to more effectively charge a Gel Cell or AGM style battery.

A: Yes, adding a solar panel will not adversely affect your converter.
A: Schematics for Parallax electronic "switch mode" converter/chargers are proprietary and are not available for release. We appreciate your understanding.
A: Parallax converter models deliver a nominal "float voltage" output of 13.2 -13.8 volts DC. Leaving the RV connected to 120VAC and the converter output connected to the battery should present no problems as long as this "float voltage" is between 13.2 - 14.1 volts DC and recommended battery maintenance is performed.