# Voltage balancer QOLTEC 51098 for 48V systems — 4×12V battery equalizer

**URL:** https://aio.lv/en/product--qoltec-51098--11558564
**Data updated:** 2026-02-15 12:51 (EET)
**Category:** Batteries
**Manufacturer:** QOLTEC
**Manufacturer code:** 51098
**EAN:** 5901878510989
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 54.99 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 45.45 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--qoltec-51098--11558564

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 22.06.2026 | free |
| Pickup points | 29.06.2026 | 1.99 EUR |
| Courier delivery to door | 29.06.2026 | 4.99 EUR |

## Summary description

Voltage balancer QOLTEC 51098 is designed for 48V battery systems composed of four 12V batteries. It balances voltages across the 4×12V string to improve battery life and system reliability. Intended for use in renewable energy setups, UPS, and off-grid systems, it helps prevent overcharge/undercharge of individual batteries and maintains stable operation.

## Long description

Voltage balancer QOLTEC 51098 for 48V systems — 4×12V battery equalizer is designed to maintain voltage balance across a series string of four 12V batteries used in 48V installations. The device continuously monitors and redistributes charge between individual batteries to reduce voltage differences, helping to prolong battery service life and ensure consistent performance in renewable energy installations, uninterruptible power supplies (UPS) and off-grid power systems.
Advantages
The balancer reduces the risk of overcharging or deep discharging of single batteries by equalizing voltages across the 4×12V string, which supports longer overall battery lifespan and more reliable system operation. Its passive, maintenance-free operation integrates with existing battery banks without complex setup. The device is compact and suitable for installation in confined spaces near the battery array, contributing to improved system stability and reduced need for frequent battery replacement.
Suitable for
48V battery banks built from four 12V lead-acid or AGM batteries
Small to medium renewable energy systems (solar or wind) with a 48V battery string
UPS, telecom backup and off-grid power systems requiring battery voltage equalization
Key specifications
Compatibility: designed for 48V systems composed of four 12V batteries
Function: passive voltage equalization across a 4×12V series string
Installation location: connects across individual 12V batteries within the series string
Operation: continuous balancing during normal battery charge and discharge cycles
Form factor: compact unit suitable for mounting close to battery terminals
How to use
Install the balancer by connecting its leads to the corresponding terminals of each 12V battery in the 48V series string according to the manufacturer’s wiring diagram. Ensure the system is de-energized or follow appropriate safety procedures before making connections. After proper installation, the balancer operates automatically and requires no user adjustments; it works during normal charging and discharging to redistribute charge and reduce voltage differences between batteries.
Usage recommendations
Use the balancer with batteries of similar type, age and capacity for best results. Regularly inspect battery connections and terminal corrosion, and follow safe handling and maintenance practices for lead-acid or AGM batteries. Do not use the device with battery chemistries or configurations other than a 4×12V series string designed for 48V systems.

## FAQ

### How much does the Voltage balancer QOLTEC 51098 for 48V 4×12V cost, and is it available for purchase?

The price is 54.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 214 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 22.06.2026 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/11558564/66562576_large.webp