You may have one or a whole host of questions about the electrical systems we manufacture. At Parallax Power Supply, we believe good information solves a great many problems. Here are answers to FAQs about our recreational vehicle products.

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Q: Are you purchasing a Parallax Power Supply product online?
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 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) 443-4859, Option 3; or email us at warranty@parallaxpower.com.

Q: Why do Recreational Vehicles need Converter/Chargers?
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.

Q: What is the maximum rate my Parallax Converter will recharge my batteries?
A: 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

Q: Does my Converter/Charger completely shut-off when the battery reaches full charge?
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

Q: Why doesn’t the fan on my converter run all of the time?
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.

Q: Does my converter have any protection from electrical issues?
A: Parallax converters feature overcurrent 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.

Q: What is the term of the converter warranty?
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.

Q: What are the fuses on the front of the converter designed to do?
A: These fuses protect the converter from damage.

Q: Can I leave my Parallax converter system constantly connected to 120VAC power? Will this damage my batteries?
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.

Contact us today when you have questions other than these. We proudly serve RV dealerships throughout North America.