how quickly will it inflate a queen sized air mattress?

Its an inverter, not a compressor, so it will inflate your air mattress at the same rate that an overripe banana would... ie, it wont. It cant. So eat the banana and purchase an inflator. Now, if you are using this inverter it to *power* an inflator, then the inflator will work at the same speed as it would plugged into a wall socket. But I’d still eat a banana because its clear you have a potassium deficiency (but I’m not a doctor so you may want a second opinion).

is this a three phase inverter?

500W Three Phase @ $60? In what world is that?

I'll be attaching a relay on the (+) connector, so I'll keep the switch in the ON position all the time, is there a problem with this setup?

Max power draw is very close to 40 amps (34-38 depending on battery voltage). The relay would have to be a 50 amp rating MINUMUM, and higher if you can get it. I believe the next common rating is 70 or 75 amps.

What size are the posts on the inverter? 5/16 or 3/8?

It is neither. The posts on my unit are 3/16, which is adequate for the loop connectors and any load I'll be creating while using the unit.

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

BESTEK 500W Pure Sine Wave Power Inverter DC 12V to AC(2 Outlets) 110V Car Charger Plug Inverter Adapter Converter with 4.2A Dual USB Charging Ports, ETL Listed

Product ID: 177529791

Details

Battery Capacity
12
Brand
BESTEK
Power Source
DC
Recommended Uses For Product
Vehicle
Wattage
500 watts

⚡500W Pure Sine Wave Output

🔌2 AC Outlets + 2 USB Ports (4.2A max)

🛡️Multi-layer Safety Protections

544.72 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered 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 Tunisia.

Secure transaction

Description

🔋 Power your hustle anywhere with pure, reliable energy!

DUAL AC USB CHARGING PORTS - Power up laptops, phones, and more simultaneously with 2 AC outlets plus fast 4.2A dual USB charging.
COMPACT TRAVEL READY DESIGN - Lightweight 2.2 lbs with rugged aluminum casing—your perfect on-the-go power companion for work or adventure.
SEAMLESS PURE SINE WAVE POWER - Protect your sensitive electronics with clean, grid-quality AC output—no interference, no compromise.
VERSATILE POWER INPUT OPTIONS - Plug into your 12V cigarette lighter for convenience or use alligator clips for full 500W power from your car battery.
ROBUST THERMAL FUSE PROTECTION - Stay worry-free with built-in fan cooling, replaceable fuses, and safeguards against overload, overheat, and voltage spikes.

The BESTEK 500W Pure Sine Wave Power Inverter converts your car’s 12V DC into clean 110V AC power with two outlets and dual USB ports delivering up to 4.2A. ETL listed and equipped with advanced thermal management, replaceable fuses, and multiple safety protections, it ensures safe, efficient charging for sensitive electronics on the road or off-grid. Compact and versatile, it supports both cigarette lighter and direct battery connections for flexible power needs.

Specifications

ASIN	B082MDRC64
Antenna Location	Vehicle
Battery Capacity	12
Best Sellers Rank	#7,780 in Automotive ( See Top 100 in Automotive ) #21 in Power Inverters
Brand	BESTEK
Built-In Media	500W Pure Sine Wave Power Inverter DC 12V to AC 110V Car Plug Inverter Adapter Power Converter with 4.2A Dual USB Charging Ports and 2 AC Outlets Car Charger
Color	1 Red
Customer Reviews	4.5 4.5 out of 5 stars (3,365)
Electrical Output Waveform	Pure Sine Wave
Energy Specifications Met	ETL
Frequency	60 hertz
Input Voltage	12 volts
Item Dimensions L x W x H	8.7"L x 4.3"W x 2.4"H
Item Weight	2.2 pounds
Manufacturer	BESTEK
Mfr Part Number	MRZ5011BU
Model Name	MRZ5011BU
Model Number	MRZ5011BU
Number of Items	1
Number of Outlets	4
Output Power	500 watts
Output Voltage	110 volts
Power Source	DC
Standby Power Shutoff	90
Unit Count	1 Count
Voltage	110 volts
Warranty Description	2-year Warranty
Wattage	500 watts

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.