Does the 100 amp work good with car amplifier and subwoofer over 800watt rms?

Yes if you run an appropriate car battery in parallel with the 100 amp power supply. Stereo shops use the 100 amp unit as well. Think of it like this, the power supply is the alternator and the battery is the power source. Car batteries are everywhere and cheap. Run the two together and you will be just fine.

Anyone know how to contact the manufacturer regarding faulty product???

I also got a 120a pm3 LK for charging my lifepo4 bank. The unit fan did not work for 4 days then started working and the converter changes volts and amps constantly after it is on for 15min.. clearly a defective unit.. I emailed powermax. They responded a few times to trouble shoot. Then once we established the unit is faulty now they refuse to respond to my emails… disputed charge on my credit card… not a good way to run a business.

Which model (Amps?) would be suitabe from 900 starting watts/700 running watts?

900W equates to 75A at 12V dc. W=V*I or Watts=Voltage times Current. So though the 75A model will work, but I would use the 100A model just to be on the safe side.

Is there any reason i can't replace my 55amp with this? Will my 3500 watt generator run it?

Yes, a 3500 watt generator will provide 29.2 amps at 120 volts, however my 100 amp charger draws 17.1 amps when providing 91 amps output, so 120×17.1=2052 watts consumed to provide 12×91=1092 watts, giving a 53% efficiency ratio. Your 3500 watt generator will run one charger with power to spare, and would run two at low output figures, but would trip a breaker if two chargers were both supplying maximum output.

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PowerMax PM4-100A 100A Deck Mount RV Converter Charger Lithium

Product ID: 37672863

Details

Brand
PowerMax
Color
Metallic
Input Voltage
110 volts
Item Weight
7 pounds
Item dimensions L x W x H
12 x 9 x 5

⚡100A regulated 12V DC output

🔋Smart multi-stage charging tech

🔧Deck-mount design for easy install

₨7387

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Description

🔌 Power your adventure with precision and peace of mind!

BUILT IN SAFETY SHIELDS - Current limiting, reverse polarity, and thermal protection ensure reliable, worry-free operation.
SLEEK DECK MOUNT DESIGN - Compact standalone unit installs right by your battery bank for streamlined setup.
POWER PACKED 100 A OUTPUT - Delivers robust, clean 12V DC power to keep your RV running smoothly.
LITHIUM READY FLEXIBILITY - Adjustable output tailored for modern lithium battery systems—future-proof your power.
SMART MULTI STAGE CHARGING - Optimizes battery health with intelligent charging for lead-acid and lithium batteries.

The PowerMax PM4-100A is a high-performance 100 amp 12V DC converter charger designed for RVs, featuring smart multi-stage charging compatible with lead-acid and lithium batteries. Its deck-mount design allows easy installation near your battery bank, while built-in protections ensure safe, dependable operation. Ideal for millennial RV owners seeking reliable, efficient power management on the go.

Specifications

ASIN	B01ER3LH5W
Best Sellers Rank	#16,510 in Automotive ( See Top 100 in Automotive ) #4 in RV Power Converters
Brand	PowerMax
Built-In Media	Battery Charger Install guide
Color	Metallic
Customer Reviews	4.4 4.4 out of 5 stars (716)
EU Spare Part Availability Duration	5 years
Global Trade Identification Number	00685867998228
Input Voltage	110 volts
Item Dimensions	12 x 9 x 5 inches
Item Type Name	PowerMax PM4 100A 110V AC to 12V DC 100 Amp Power Converter with Built-in 4 Stage Smart Battery Charger
Item Weight	7 pounds
Manufacturer	PowerMax
Mfr Part Number	PM4 100A
Model Number	PM4 100A
Number of Items	1
Number of Outlets	1
Output Voltage	12 volts_of_direct_current
Plug Type	Type B
Power Source	Battery Powered
UPC	685867998228
Unit Count	1 Count
Warranty Description	2 Years

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₨7387

Duties & taxes included

In stock

Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Seychelles.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

View all Trustpilot reviews