# Solar charge controller QOLTEC MPPT 15A for powering DC systems, model 53666

**URL:** https://aio.lv/en/product--qoltec-53666--11563770
**Data updated:** 2026-02-15 18:35 (EET)
**Category:** Battery chargers
**Manufacturer:** QOLTEC
**Manufacturer code:** 53666
**EAN:** 5901878536668
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 25.49 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 21.07 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--qoltec-53666--11563770

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 25.06.2026 | free |
| Pickup points | 30.06.2026 | 1.99 EUR |
| Courier delivery to door | 30.06.2026 | 4.99 EUR |

## Summary description

MPPT solar charge controller QOLTEC 15A (model 53666) is designed to regulate charging of batteries from photovoltaic panels for DC-powered systems. The device implements Maximum Power Point Tracking to improve charging efficiency, supports up to 15A charge current and protects against overcharge, short circuit and reverse polarity. Suitable for small off-grid installations, boat or caravan power management and backup systems.

## Long description

QOLTEC MPPT 15A solar charge controller (model 53666) is a compact device for regulating battery charging from photovoltaic panels in DC-powered systems. The controller uses Maximum Power Point Tracking (MPPT) to optimize energy harvest from solar modules, delivering up to 15A of charging current while providing essential protections such as overcharge prevention, short-circuit protection and reverse-polarity safeguard. Its design is intended for small off-grid installations, recreational vehicles, boats and backup power systems where efficient battery management is required.
Advantages
The MPPT algorithm increases charging efficiency compared with simple PWM controllers, enabling higher energy conversion from the same solar array. The controller supports regulated charging current up to 15A and includes built-in protection features to prolong battery life and ensure safe operation. Its compact form factor and straightforward connections make installation and integration into DC systems fast and practical.
Suitable for
 Small off-grid solar installations for cabins and sheds
 Boat and marine 12V DC power management
 Caravan and RV battery charging systems
 Backup power setups and small energy storage systems
Key specifications
 Maximum charging current: 15 A
 Operating voltage range: compatible with common 12 V DC battery systems
 MPPT charge regulation for improved photovoltaic efficiency
 Protection functions: overcharge protection, short-circuit protection, reverse-polarity protection
 Compact dimensions suitable for limited-space installations
How to use
Mount the controller in a dry, ventilated location close to the battery bank and protected from direct weather exposure. Connect the battery first, observing correct polarity, then connect the photovoltaic panel array to the controller input and finally connect any load outputs if required. Configure the controller according to the battery type and system voltage settings following the manufacturer’s instructions. Regularly check wiring connections and battery state to ensure stable operation.
Usage recommendations
For optimal performance, match the solar panel array voltage to the controller’s recommended input range and size the array so the peak current does not exceed the 15A charging limit. Use proper cable gauges and quality connection terminals to minimize voltage drop. Periodic inspection of battery health and terminal cleanliness will help maintain efficient charging and prolong battery life.

## FAQ

### How much does the Solar charge controller QOLTEC MPPT 15A 53666 cost, and is it available for purchase?

The price is 25.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 6 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 25.06.2026 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. 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

https://aio.lv/img/cache/product/11563770/66569282_large.webp