# Solar charge controller QOLTEC MPPT 20A 12V/24V with 2×USB ports

**URL:** https://aio.lv/en/product--qoltec-53661--11041850
**Data updated:** 2026-02-13 15:48 (EET)
**Category:** Battery chargers
**Manufacturer:** QOLTEC
**Manufacturer code:** 53661
**EAN:** 5901878536613
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

QOLTEC MPPT 20A solar charge controller is designed for 12V and 24V battery systems and provides maximum power point tracking (MPPT) for improved solar panel efficiency. With a 20A charging current rating and two USB ports for charging small devices, it suits off-grid solar setups, RVs, boats and backup systems. It regulates charging, protects batteries and helps extend battery life.

## Long description

QOLTEC MPPT 20A 12V/24V solar charge controller provides maximum power point tracking to optimize energy harvest from photovoltaic panels for 12V or 24V battery systems. The controller supports up to 20A charging current and includes two USB ports for direct charging of phones and small devices. It performs regulated charging, battery protection and basic system monitoring functions suitable for off-grid installations, recreational vehicles, boats and small backup power systems.
Advantages
The MPPT algorithm increases charging efficiency by continuously adjusting panel operating point to extract maximum available power. Built-in battery regulation protects against overcharge, deep discharge and reverse polarity, while the two USB ports allow convenient on-site charging of mobile devices without additional adapters. Compact housing and clear connection terminals simplify installation in limited-space applications.
Suitable for
Small off-grid solar systems for cabins and remote power
RVs, campervans and caravans requiring battery maintenance
Marine applications such as boats and yachts with 12V/24V battery banks
Backup power systems for lighting and low-power electronics
Key specifications
Nominal system voltages: 12V and 24V automatic detection
Maximum charging current: 20A
MPPT algorithm for improved solar panel efficiency
Two USB output ports for charging small devices
Battery charge regulation with multi-stage charging profiles
Protection features: overcharge protection, deep discharge prevention, reverse polarity protection
Connection type: screw terminals for PV, battery and load
Compact form factor suitable for small installations
How to use
Mount the controller in a dry, ventilated location close to the battery bank and within reach of PV cable runs. Ensure correct system voltage selection (the device supports automatic detection of 12V/24V). Connect the battery first, then the solar panel input, and finally any load; follow correct polarity to avoid damage. Use the USB ports to charge phones or small electronics directly. Observe wiring guidelines and recommended wire gauges for the 20A current rating.
Usage recommendations
For optimal performance, pair the controller with panels whose combined open-circuit voltage remains within the device's allowable PV input range and size the array to match the 20A maximum charge current. Regularly check battery electrolyte levels if using flooded batteries and inspect connections for corrosion. Avoid installing the controller in direct sunlight or near heat sources to maintain thermal stability and prolong service life.

## FAQ

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

### 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

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