Trojan 27-GEL · Solar battery 12V 91Ah GEL
Specifications
| Brand | TROJAN |
|---|---|
| Part number | 27-GEL |
| Voltage (V) | 12 |
| Capacity (C20) | 91Ah (c20) |
| Capacity (C5) | 76Ah (c5) |
| Technology | GEL |
| Length | 324.00 mm |
| Width | 171.00 mm |
| Height | 234.00 mm |
Trojan 27-GEL 12V 91Ah 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 systemsoptimised for daily charge/discharge cycles
- Handles extreme temperaturesin technical rooms or outdoor installs
- Minimal self-dischargewhen left idle over winter or holidays

Solar battery Trojan 27-GEL 91Ah 12V
For off-grid photovoltaic installations and storage systems, the Trojan 27-GEL stores 91 Ah with GEL technology through daily charge and discharge cycles. It measures 324 × 171 × 234 mm, the format sought by anyone replacing a 91 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.
Will it fit your current battery tray?
In terms of format, the Trojan 27-GEL measures 324 × 171 × 234 mm (length × width × height) and weighs 29 kg. It uses 7 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 the Trojan 27-GEL is for
Designed for off-grid photovoltaic installations and storage systems, the Trojan 27-GEL tolerates extreme temperatures and long periods of low activity. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 29 kg and 7 terminals.
Technology inside the Trojan 27-GEL
The 27-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.
In a GEL battery the electrolyte is gelled with silica: it is fully sealed, cannot spill and tolerates deep discharge very well. It is the preferred technology in electric mobility, marine service and heavy-cycling applications.
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. All the Trojan batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty.
Warranty and coverage
The Trojan 27-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.
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.
Delivery times and returns
Orders placed before 6:00 pm with the battery in stock ship the same day. Delivery in mainland Spain and Portugal takes 24-48 working hours; for the Balearic Islands and the rest of the European Union allow 3 to 5 working days. You have 14 days to return an unused battery; in mainland Spain and Portugal collection is free. We email you the tracking number as soon as the parcel ships.
Codes and references Trojan 27-GEL
| Brand | Trojan |
|---|---|
| Manufacturer range | TROJAN GEL |
| Manufacturer part number (MPN) | 27-GEL |
| Also known as | 27GEL · 27 GEL |
| EAN-13 barcode | 8404653001322 |
| Dimensions (length × width × height) | 324 × 171 × 234 mm (324x171x234) |
Recommended accessories
Compatible vehicles
The Trojan 27-GEL fits 22 vehicles. Most searched below:
Frequently asked questions
Is the 27-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 27-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 our blog. 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 long does the Trojan 27-GEL battery last?
Expected lifespan of the Trojan 27-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 27-GEL battery?
Dimensions (length × width × height) are 324×171×234 mm — also written as 324x171x234 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.
Which batteries are equivalent to the Trojan 27-GEL?
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.
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