# Trojan J305-AGM · Solar battery 6V 310Ah

![Trojan J305-AGM · Solar battery 6V 310Ah](https://bateriasonline.es/3380-home_default/trojan-j305-agm.jpg)

> Trojan J305-AGM: 310 Ah solar battery, 296×176×358 mm, AGM. Equivalent to Trojan SAGM 06 315. Compare sizes and equivalents; 14-day returns.

**Category:** [Solar batteries for off-grid systems](https://bateriasonline.es/en/off-grid-solar-batteries) → [Trojan](https://bateriasonline.es/en/trojan-batteries)

- **Canonical URL**: https://bateriasonline.es/en/trojan-j305-agm
- **Language**: en
- **Brand**: Trojan
- **Reference**: BOL-TROJAN-J305-AGM
- **MPN**: J305-AGM
- **Price**: 801,93 € (VAT incl., Spain)
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Trojan |
| Range | TROJAN AGM RELIANT |
| Application | Solar and off-grid systems |
| Technology | AGM |
| Voltage | 6 V |
| Capacity | 310 Ah |
| Length | 296 mm |
| Width | 176 mm |
| Height | 358 mm |
| Weight | 44 kg |
| Terminal type | 5, 6, 15 |

## Quick description

The Trojan J305-AGM is a solar battery with 6 V and 310 Ah, measuring 296 × 176 × 358 mm.

## Description

## Where the Trojan J305-AGM fits

The Trojan J305-AGM is made for stand-alone photovoltaic and off-grid systems. Its capacity is rated at 20 hours (C20); at slower discharge rates the usable capacity is higher.
The J305-AGM belongs to the Trojan TROJAN AGM RELIANT range. [More Trojan batteries](https://bateriasonline.es/en/trojan-batteries)

## AGM technology in the J305-AGM

Inside, the J305-AGM has glass fibre separators (AGM) that hold the electrolyte. It is fitted in cars with advanced Start-Stop and in deep-cycle equipment.

## Trojan J305-AGM vs SAGM 06 315 and SAES 06 315: differences

Torn between the J305-AGM and another similar Trojan? This is what changes:

| Model | Capacity | Dimensions (mm) | Weight |
|---|---|---|---|
| Trojan J305-AGM (this one) | 310 Ah | 296 × 176 × 358 | 44 kg |
| Trojan SAGM 06 315 | 315 Ah | 296 × 176 × 355 | 43 kg |
| Trojan SAES 06 315 | 285 Ah | 296 × 176 × 355 | 45 kg |

- Trojan SAGM 06 315: 5 Ah more, a different case (296 × 176 × 355 mm).
- Trojan SAES 06 315: 25 Ah less, a different case (296 × 176 × 355 mm).

## Equivalents and alternatives to the Trojan J305-AGM

As the J305-AGM is an AGM battery, we only list other AGM batteries with its dimensions and polarity: neither an EFB nor a conventional battery can replace it.

| Model | Technology | Capacity | Dimensions (mm) |
|---|---|---|---|
| Trojan SAGM 06 315 | AGM | 315 Ah | 296 × 176 × 355 |

## Trojan J305-AGM codes and part numbers

Shops, garages and catalogues identify the J305-AGM with these codes:

| Commercial reference | J305-AGM |
|---|---|
| Terminal type | 5, 6, 15 |

## What to look at before buying the J305-AGM

- With 310 Ah, the J305-AGM replaces an original battery of that capacity or slightly less.
- Measure the space: the J305-AGM takes up 296 × 176 × 358 mm.

## Frequently asked questions about the Trojan J305-AGM

### Trojan J305-AGM or SAGM 06 315?

Compared with the J305-AGM, the Trojan SAGM 06 315 has 5 Ah more. With 315 Ah, the SAGM 06 315 runs longer between charges than the J305-AGM (310 Ah). Mind the space: the SAGM 06 315 measures 296 × 176 × 355 mm.

### How much does the Trojan J305-AGM weigh?

The J305-AGM weighs 44 kg. For reference, the Trojan SAGM 06 315 (315 Ah) weighs 43 kg.

### Which battery is equivalent to the Trojan J305-AGM?

Only other AGM batteries with its dimensions and polarity: Trojan SAGM 06 315. Neither an EFB nor a conventional battery replaces the J305-AGM.

### Which regulator do I need?

One with a profile for the battery technology (AGM, gel, flooded or lithium) and temperature compensation. MPPT regulators get more out of the panels.

## Other options if you are unsure about the J305-AGM

- [All solar batteries for off-grid systems](https://bateriasonline.es/en/off-grid-solar-batteries)
- [More Trojan models](https://bateriasonline.es/en/trojan-batteries)
- [Trojan SAGM 06 315](https://bateriasonline.es/en/trojan-sagm-06-315) · 315 Ah, 296×176×355 mm

---
*bateriasonline.es — Batteries and accessories · 2026-11-10*