# Solar battery Trojan 8D-GEL 12V 225Ah GEL ![Solar battery Trojan 8D-GEL 12V 225Ah GEL](https://baterias.com/680-home_default/battery-trojan-8d-gel-12v.jpg) > Trojan 8D-GEL solar battery 12V 225Ah GEL. Dimensions 534×279×233 mm. Designed for PV systems with daily cyclic loads. **Category:** [Batteries for Solar Applications](https://baterias.com/gb/batteries-for-solar-applications) → [TROJAN](https://baterias.com/gb/trojan) - **Canonical URL**: https://baterias.com/gb/battery-trojan-8d-gel-12v - **Language**: en-GB - **Brand**: TROJAN - **Reference**: BCOM-TROJAN-8D-GEL - **EAN**: 8404653000028 - **MPN**: 8D-GEL - **Price**: 1.841,95 € - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | TROJAN | | Reference | 8 D-GEL | | Model | TROJAN GEL | | Voltage (V) | 12 V | | Largo | 534 mm | | Ancho | 279 mm | | Alto | 233 mm | | Peso | 71 kg | | Tecnología | GEL | | Terminal type | 5 | | Capacity (C20) | 225 Ah (c20) | | Capacity (C5) | 188 Ah (c5) | ## Quick description **Trojan 8D-GEL 12V 225Ah** is a solar battery designed for PV systems with daily charge/discharge cycles. Tolerates extreme temperatures well, with low self-discharge during winter shutdowns or between stays at vacation homes. ### Why this solar battery? - **Designed for solar systems** optimised for daily charge/discharge cycles - **Handles extreme temperatures** in technical rooms or outdoor installs - **Minimal self-discharge** when left idle over winter or holidays 🔌 Voltage 12 V ⚡ Capacity 225 Ah C20 📏 Dimensions 534×279×233 mm ⚙️ Technology GEL ⚖️ Weight 71 kg 🏷️ Model TROJAN GEL ## Description ## Solar battery Trojan 8D-GEL 225Ah 12V 12*V* Voltage 225*Ah* Capacity 71*kg* Weight The **12 V**, **225 Ah** **Trojan 8D-GEL** solar battery with GEL technology is designed for off-grid photovoltaic installations and storage systems. It measures 534 × 279 × 233 mm, the format sought by anyone replacing a 225 Ah battery in off-grid PV systems. - Long life on float and moderate cycling. - Good tolerance to extreme temperatures. - Optimised for daily charge and discharge cycles. - GEL technology: gelled electrolyte, fully sealed and maintenance-free. ### What the Trojan 8D-GEL is for The Trojan 8D-GEL is designed for off-grid photovoltaic installations and storage systems. Size the capacity so as not to discharge more than 50% daily and you will greatly extend its life. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 71 kg and 5 terminals. ### Technology inside the Trojan 8D-GEL The 8D-GEL is one of the Trojan references for this type of use; it shares the same manufacturing and quality-control criteria as the rest of the brand's catalogue. A GEL battery is the choice when cycle resistance and safety matter most: no gases, no liquid and thousands of partial discharges in its lifetime. ### Size, terminals and hold-down of the Trojan 8D-GEL It has external dimensions of 534 × 279 × 233 mm and weighs 71 kg. It uses 5 terminals, the system that anchors and connects it in the vehicle. For a direct replacement, the current battery tray must accept these dimensions and the same terminal layout; otherwise adapters will be needed or the hold-down will change. ### What Trojan does differently Trojan Battery is the world reference in deep-cycle batteries: golf carts, cleaning machines, aerial platforms and solar systems rely on its T2 technology and longevity. At baterias.com we work directly with the manufacturer or its official distributor: real stock, brand-new product and official warranty. ### Care and maintenance GEL batteries need lower charging voltages: always use a charger with a GEL mode so as not to damage the electrolyte. In the darker months, check the voltage periodically and avoid full discharges. ### Warranty and coverage The Trojan 8D-GEL comes with the **manufacturer's official warranty** against manufacturing defects. If it fails through a defect within the warranty period, we replace it at no cost to you. ### Shipping, delivery and returns Same-day dispatch from our warehouse for in-stock orders placed **before [[ks:cutoff]]**: 24-48 working hours in mainland Spain and Portugal, 3 to 5 days in the islands and the rest of Europe. Returns are accepted for **[[ks:return_days]] days** if the battery has not been used (free collection on the Iberian mainland). You will receive tracking by email. ## Frequently asked questions ### Is the 8D-GEL model a gel battery? Where is it used? Yes, this model is a GEL battery: sealed lead-acid where the electrolyte is in gel form. It tolerates deep discharges very well and is ideal for cyclic use (solar, motorhomes, electric wheelchairs, motorcycles). Requires a GEL-specific smart charger — max charge voltage ~14.1 V (vs 14.4-14.7 V for AGM). Lifespan 6-10 years. ### How is the Trojan 8D-GEL battery installed in the vehicle? In most devices it fits in 15-30 minutes with a 10 mm wrench; if the battery is under the seat or in the boot the time can double. See the step-by-step guide on this page. Quick summary: 1) switch off the engine and remove the key; 2) locate the original battery (engine bay, boot or under seat); 3) disconnect the negative (−) terminal first, then the positive (+); 4) loosen the hold-down clamp and remove the old battery; 5) fit the new one in the same orientation — match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (−). On devices with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile. ### How many years does this battery last? Expected lifespan of the Trojan 8D-GEL is 6 to 10 years in cyclic use (marine, caravan, solar) with controlled discharges. In cold regions it drops slightly due to cold-start stress; in very hot regions it also drops because of electrolyte evaporation. To extend its life: avoid deep discharges (headlights on with engine off), have the alternator checked yearly, and keep the battery clean and properly secured. ### What are the dimensions of the Trojan 8D-GEL battery? Dimensions (length × width × height) are 534×279×233 mm — also written as 534x279x233 mm — following the European DIN standard. Always measure the space in your device before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals. ### What are the equivalents of the 8D-GEL model? Directly interchangeable batteries (same dimensions, same polarity, same Ah and CCA) are the OEM equivalents from leading brands: Bosch, Tudor, Exide and, depending on the model, Banner or Yuasa. Exact equivalence depends on technology — an EFB cannot be replaced with a conventional battery in Start-Stop devices. See the "Equivalents" section to view recommended options at the same performance level. ## Reviews - **Average rating**: 4.59 / 5 (6 reviews) ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — over 25 years of experience validating automotive batteries. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-09-28*