Trojan 31-GEL · Solar battery 102Ah GEL

Solar battery Trojan 31-GEL 102Ah 12V

The Trojan 31-GEL with GEL technology stores 102 Ah at 12 V for off-grid photovoltaic installations and storage systems. It replaces the original battery without adaptation in off-grid PV systems with a 329 × 171 × 245 mm format: same 102 Ah capacity.

• Good tolerance to extreme temperatures.
• Long life on float and moderate cycling.
• GEL technology: gelled electrolyte, fully sealed and maintenance-free.
• Optimised for daily charge and discharge cycles.

What the Trojan 31-GEL is for

Designed for off-grid photovoltaic installations and storage systems, the Trojan 31-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 32 kg and 7 terminals.

Technology inside the Trojan 31-GEL

Trojan builds the 31-GEL to the same standards as the rest of its catalogue; what changes between references is capacity, format and terminal position.

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.

Dimensions, polarity and mounting

The Trojan 31-GEL is made in the 329 × 171 × 245 mm format and weighs 32 kg. It uses 7 terminals, the system that anchors and connects it in the vehicle. Checking the three dimensions and the terminal position before buying avoids the most common mistake when replacing a battery.

What Trojan does differently

Founded in 1925 in California, Trojan invented the golf cart battery and remains the standard in deep-discharge applications that demand thousands of cycles. We guarantee that every Trojan arrives new, charged and with the manufacturer's full warranty.

Usage and maintenance tips

In the darker months, check the voltage periodically and avoid full discharges. GEL batteries need lower charging voltages: always use a charger with a GEL mode so as not to damage the electrolyte.

Warranty and coverage

The Trojan 31-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.

Delivery times and returns

Order before 6:00 pm with stock available and it leaves today: mainland Spain and Portugal receive it in 24-48 working hours, the islands and the rest of the EU in 3 to 5 days. You have 14 days to return it if it has not been installed, with free collection on the mainland, and shipment tracking by email.