--- title: "Havensis 40A DC-DC Battery Charger — Caravan Alternator Charging | GESPA Energy" description: "Havensis DCDC-1224 40 A DC-DC battery charger: fast charging of the caravan house battery from the alternator. 12-12, 12-24, 24-12, 24-24 V, 96.4% efficiency, engine-off detection." canonical: https://www.gespaenerji.com/en/havensis-dcdc-40a.html lang: en dateModified: 2026-09-29 publisher: "GESPA Enerji" --- [Home](https://www.gespaenerji.com/en/) / [Online Store](https://www.gespaenerji.com/en/online-satis.html) / Havensis DCDC-1224 One-Way DC-DC Battery Charger 12/24 V 40 A ![Havensis DCDC-1224 DC-DC battery charger](https://www.gespaenerji.com/assets/img/products/havensis-dcdc-1224.webp) 🚐 Caravan · DC-DC Charging # Havensis DCDC-1224 One-Way DC-DC Battery Charger 12/24 V 40 A Product code: **DCDC-1224-40** In stock / available to order One-way DC-DC battery charger that quickly charges the caravan's house battery from the alternator while you drive: 40 A charging current and every combination of 12 and 24 V vehicles and batteries. It detects when the engine stops and protects the starter battery. **₺11.800** ≈ $240 Price includes VAT. 💰 By bank transfer: **₺11.450** [🛒 Add to cart](https://www.gespaenerji.com/en/sepet.html) [⚡ Buy it now](https://www.gespaenerji.com/en/sepet.html) [💬 Ask on WhatsApp](https://www.gespaenerji.com/en/iletisim.html) - 🚚 Shipped by courier to anywhere in Türkiye. - ⏱️ Estimated delivery after order confirmation: **2–5** business days. - 🔄 Right of withdrawal (distance sales): **14** days — return shipping is paid by the buyer. - 🔋 Batteries are not included. - 🏭 Made in Türkiye · Havensis 🔋 12/24 V · 40 A 🚐 Charging from the alternator 🔁 12-12 · 12-24 · 24-12 · 24-24 V ⚙️ 96.4% efficiency 🏭 Made in Türkiye The Havensis DCDC-1224 is a one-way DC-DC battery charger designed especially for caravans. This model works with a 40 A charging current; it accepts a 10–35 V input, delivers a 12–32 V output and has a conversion efficiency of 96.4%. While the vehicle runs, the alternator charges the starter battery; the caravan's fridge, lights and water pump run from a second battery, the house battery. Linking the two batteries directly also drains the starter battery when parked; a simple relay often cannot charge the house battery fully, and long cables lose voltage. A DC-DC battery charger sits between the two batteries: it takes the energy from the alternator and passes it to the house battery in a controlled way. Because it can charge 12-12, 12-24, 24-12 and 24-24 V, your house battery can be 12 V or 24 V whether your vehicle is 12 V or 24 V. Engine-off detection recognises when the vehicle stops and blocks reverse current, so the starter battery is not drained for the house battery while parked. All parameters are programmed from the display; because the digital display connects with a 5 m extension cable, you can mount it inside the caravan while the unit sits next to the batteries. The unit is made in Türkiye by Havensis. We ship it anywhere in Türkiye and offer optional on-site installation in the Antalya region. | Brand | Havensis | | --- | --- | | Model | DCDC-1224 | | Type | One-way | | Battery voltage | 12/24 V | | Charging combinations | 12-12, 12-24, 24-12, 24-24 V | | Charging current | 40 A | | Input voltage | 10–35 V | | Output voltage | 12–32 V | | Conversion efficiency | 96.4% | | Charging source | Alternator (via the starter battery) | | Settings | All parameters programmable via the display | | Indicators | LED status indicator | | Display | Digital display connection, 5 m extension cable | | Protection | Reverse-current protection (engine-off detection) | | Design | Designed especially for caravans | | Dimensions | 162 × 210 × 70 mm | | Origin | Made in Türkiye | Values are taken from the manufacturer's (Havensis) product list. If you need a value that isn't listed, write to us and we'll confirm it with the manufacturer. What is a DC-DC battery charger? [Solar Glossary →](https://www.gespaenerji.com/en/sozluk.html#dc-dc-sarj) - Products are shipped by contracted courier to every province of Türkiye; delivery is not limited to Antalya. - Estimated delivery is 2–5 business days after order confirmation; the tracking number is sent via WhatsApp. - Shipping is paid by the buyer and is stated exactly at order confirmation. Prices include VAT. - Under distance-selling rules you may withdraw within 14 days of delivery; for a problem-free delivery the return shipping is paid by the buyer. - For damaged or defective goods all costs are ours — please inspect the parcel in front of the courier on delivery. - Optional on-site installation and training is offered in the Antalya region. Applications ## Where is it used? Anywhere a second battery in a vehicle needs charging from the alternator on the road. 🚐 ### Caravans and motorhomes Fills the house battery from the alternator on the road; when you reach camp, the battery is ready for the fridge, lights and water pump. ⛵ ### Boats and yachts Charges the service battery while the engine runs; the starter battery stays ready to start the engine. 🚑 ### Service and work vehicles Charges the second battery while the engine runs in ambulances, mobile sales, camper and workshop vehicles. 🚚 ### 24 V trucks and buses Charges a 12 V (24-12) or 24 V (24-24) house battery in a 24 V vehicle, so your 12 V devices need no separate converter. Installation ## How is it connected? The unit is connected between the starter battery and the house battery; the digital display can be placed inside the caravan with its 5 m cable. - ⚙️ **Alternator**While the engine runs - 🔋 **Starter battery**12/24 V - 🔁 **DC-DC charger**DCDC-1224 - 🔋 **House battery**12/24 V - 🏕️ **Caravan devices**Fridge, lights, pump 📟 The digital display connects to the unit with a 5 m extension cable, so charging is monitored and programmed from inside the caravan. - 1 ### Connect the input Connect the unit's input to the starter battery, with a suitable fuse close to the battery. - 2 ### Connect the output Connect the output to the house battery, again with a fuse close to the battery. - 3 ### Place the display Put the digital display where you can see it using the 5 m cable, and program the charging values for your house battery. - 4 ### Start the engine Charging happens while the engine runs; when the engine stops, the unit detects it and protects the starter battery. **Installation tips** - Mount the unit close to the batteries in a ventilated, dry place and keep cable runs short. - Choose cable size and fuses to match the model's current; because of losses, the input line carries slightly more current than the output. - Check that your alternator can handle the extra load; for newer vehicles with smart alternators, ask us. - We recommend having an auto electrician install it; send us your system diagram on WhatsApp and we'll check it together. Choosing a model ## Which model should I choose? Your choice depends on your house battery capacity and whether you need to support the starter battery. | Model | Type | Charging current | Boost | Input | Output | Efficiency | Size | | --- | --- | --- | --- | --- | --- | --- | --- | | DCDC-1224-30 | One-way | 30 A | — | 10–35 V | 12–32 V | 96.4% | 158 × 210 × 60 mm | | DCDC-1224-40 This product | One-way | 40 A | — | 10–35 V | 12–32 V | 96.4% | 162 × 210 × 70 mm | | DCDC-1224B-40 | Bidirectional | 40 A | 10 A | 10–35 V | 12–32 V | 96.4% | 162 × 210 × 70 mm | - If charging the house battery on the road is enough and your drives are long: DCDC-1224 30 A. - For a large house battery or faster charging on short drives: DCDC-1224 40 A. - For vehicles parked for long periods with a weakening starter battery, or to let a solar-charged house battery support the starter battery: the bidirectional DCDC-1224B. Complementary products ## Complete your system Order them together and everything arrives in one shipment. [![Havensis Solar-30AMPS MPPT Charge Controller 12/24 V 30 A](https://www.gespaenerji.com/assets/img/products/havensis-s30amps.webp)Havensis Solar-30AMPS MPPT Charge Controller 12/24 V 30 AAdd a panel to the caravan roof and the house battery keeps charging from the sun while parked.₺6.400 View the Product →](https://www.gespaenerji.com/en/havensis-mppt-30a.html)[![Lexron 285 W Solar Panel](https://www.gespaenerji.com/assets/img/products/panel-lexron-285w.webp)Lexron 285 W Solar Panel780 × 1536 mm, 8.5 kg: a compact TOPCon panel that is easy to lift onto the roof.₺7.500 Add to cart →](https://www.gespaenerji.com/en/sepet.html?ekle=panel-lexron-285w)[![Solar Cable Set (5 m Black + 5 m Red)](https://www.gespaenerji.com/assets/img/products/kablo-solar-5m.webp)Solar Cable Set (5 m Black + 5 m Red)Panel to controller: 5 m black + 5 m red.₺1.000 Add to cart →](https://www.gespaenerji.com/en/sepet.html?ekle=kablo-solar-5m)[![MC4 Connector Set](https://www.gespaenerji.com/assets/img/products/mc4-set.webp)MC4 Connector SetJoins the panel lead to the solar cable.₺100 Add to cart →](https://www.gespaenerji.com/en/sepet.html?ekle=mc4-set) Frequently Asked Questions ## Frequently asked ### Why do I need a DC-DC charger; can't I just link the batteries directly? A direct link also drains the starter battery when parked; simple relays often cannot charge the house battery fully, and long cables lose voltage. A DC-DC charger separates the two batteries and charges the house battery in a controlled way. ### Which vehicles is it for? Vehicles with 12 V and 24 V systems. The unit can charge 12-12, 12-24, 24-12 and 24-24 V: for example, it can charge a 12 V house battery in a 24 V truck. ### Does the starter battery drain when the engine stops? No. Engine-off detection recognises that the vehicle has stopped and blocks reverse current; the starter battery is not used for the house battery. ### How long does it take to charge my house battery? Roughly battery capacity ÷ charging current: an empty 100 Ah battery is largely charged after about 2.5–3 hours of driving at 40 A. The last part charges more slowly depending on the battery type. ### Which battery types does it work with? Since all parameters are programmed from the display, the charging values are set for your house battery. Send us your battery type and charging values and we'll check compatibility together before you order. ### Where does the display go? The digital display connects to the unit with a 5 m extension cable. While the unit sits next to the batteries, you place the display inside the caravan where you can see it, and monitor and program the charging from there. ### Should I choose 30 A or 40 A? If your house battery is large or your drives are short, the 40 A model fills the battery faster. When choosing, also consider whether your alternator can handle the extra load and the cable size. ### Should I get the one-way or the bidirectional model? If you only want to charge the house battery on the road, the one-way DCDC-1224 is enough. If your vehicle is often parked for long periods, or you want a solar-charged house battery to support the starter battery too, choose the bidirectional DCDC-1224B. ### Can I monitor it from my phone? Havensis Bluetooth and Wi-Fi monitoring modules can be fitted to this unit, letting you follow all its values on your phone. The module is not included; ask us for the price. ### Who installs it, and do you ship outside Antalya? We ship anywhere in Türkiye; an auto electrician can do the installation. In the Antalya region we offer optional on-site installation. **Is your battery bank 36–72 V?** To charge a high-voltage battery bank from a 12/24 V vehicle battery, see our BOOST DC-DC charger. [BOOST DC-DC charger →](https://www.gespaenerji.com/en/havensis-boost-dcdc-2448.html) ## Charge your house battery on the road Message us on WhatsApp for stock and delivery; we reply the same day. [🛒 Add to cart & complete order](https://www.gespaenerji.com/en/sepet.html) --- Kaynak sayfa: https://www.gespaenerji.com/en/havensis-dcdc-40a.html · GESPA Enerji · 0543 743 42 09 · info@gespaenerji.com · Örnek Mah. 1551 Sok. Yaşar Apt. No:10 İç Kapı No: Z01, Manavgat / Antalya Tüm sayfalar ve ürünler: https://www.gespaenerji.com/llms.txt · Ayrıntı: https://www.gespaenerji.com/llms-full.txt