# Power inverter QOLTEC Monolith 4000 MS Wave 12V to 230V 2000/4000W with USB

**URL:** https://aio.lv/en/product--qoltec-51928--10670604
**Data updated:** 2026-03-07 17:57 (EET)
**Category:** Car Inverters
**Manufacturer:** QOLTEC
**Manufacturer code:** 51928
**EAN:** 5901878519289
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 119.99 €
**Prices and availability valid until:** 2026-07-16 23:59
**Price without VAT (21%):** 99.17 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--qoltec-51928--10670604

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 26.06.2026 | free |
| Pickup points | 01.07.2026 | 1.99 EUR |
| Courier delivery to door | 01.07.2026 | 4.99 EUR |

## Summary description

The QOLTEC Monolith 4000 MS Wave is a 12V to 230V power inverter offering 2000 W continuous and 4000 W peak output. Designed for automotive and off-grid use, it converts vehicle or battery power to mains-grade AC and includes USB ports for charging mobile devices. Suitable for powering appliances, tools and electronics where temporary AC supply is needed.

## Long description

The QOLTEC Monolith 4000 MS Wave is a 12V to 230V power inverter that provides a continuous output of 2000 W and a peak output of 4000 W, suitable for converting vehicle or battery DC power into mains-grade AC. Designed for automotive and off-grid scenarios, this inverter produces a modified sine wave output and includes integrated USB ports for charging phones and small devices. It is intended for temporary AC supply to household appliances, power tools and electronic equipment where mains connection is not available.
Advantages
The inverter supports high continuous and surge power levels that allow operation of a range of appliances and tools. Its 12V input compatibility makes it suitable for use with car batteries, leisure vehicle electrical systems and standalone 12V battery banks. Built-in USB ports enable simultaneous charging of mobile devices without occupying AC outlets. Compact design and durable housing provide straightforward installation and reliable performance in mobile and temporary installations.
Suitable for
 Powering small to medium household appliances (kettles, microwaves, fans) within the device power limits
 Running power tools and workshop equipment for temporary jobs on-site
 Supplying AC power to laptops, chargers and consumer electronics during travel or outdoor activities
 Backup power for critical devices during short grid outages
Key specifications
 Input voltage: 12 V DC
 Continuous AC output: 2000 W
 Peak/surge AC output: 4000 W
 Output voltage: 230 V AC
 Output waveform: modified sine wave
 Integrated USB charging ports for mobile devices
 Cooling: built-in fan cooling
 Protection features: overload, over-temperature and low-voltage shutdown (functional protections)
How to use
Connect the inverter to a suitable 12V DC source such as a vehicle battery or a dedicated 12V battery bank, observing correct polarity. Place the inverter on a stable, ventilated surface and ensure clearance for airflow around the cooling fan. Plug AC devices into the 230V outlets and connect USB devices to the USB ports as needed. Monitor the inverter load to avoid exceeding the continuous or peak power ratings. If the inverter includes status indicators, use them to confirm proper operation and to identify protective shutdowns.
Usage recommendations
Use the QOLTEC Monolith 4000 MS Wave with appliances and tools whose starting and running power requirements are within the inverter's specified continuous and peak limits. Avoid prolonged operation near the maximum continuous load to reduce heat buildup. Ensure battery capacity and vehicle alternator output are sufficient for the intended run time, and follow standard safety precautions for DC connections, ventilation and grounding where applicable.

## FAQ

### How much does the Inverter QOLTEC Monolith 4000 MS Wave 12V–230V cost, and is it available for purchase?

The price is 119.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 114 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 26.06.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can Inverter QOLTEC Monolith 4000 MS Wave 12V–230V be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All QOLTEC products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized QOLTEC service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/10670604/57704066_large.webp