# Trojan 31-AGM · Solar battery 12V 100Ah

![Trojan 31-AGM · Solar battery 12V 100Ah](https://bateriasonline.es/3313-home_default/trojan-31-agm.jpg)

> Trojan 31-AGM: 100 Ah solar battery, 341×173×233 mm, AGM. Equivalent to Trojan OverDrive AGM 31. Ask for a no-obligation quote.

**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-31-agm
- **Language**: en
- **Brand**: Trojan
- **Reference**: BOL-TROJAN-31-AGM
- **EAN**: 8404653001537
- **MPN**: 31-AGM
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Trojan |
| Range | TROJAN AGM |
| Application | Solar and off-grid systems |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 100 Ah |
| Length | 341 mm |
| Width | 173 mm |
| Height | 233 mm |
| Weight | 31 kg |

## Quick description

Trojan 31-AGM: solar battery with 12 V and 100 Ah, measuring 341 × 173 × 233 mm.

## Description

## Who the Trojan 31-AGM is for

The Trojan 31-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 31-AGM belongs to the Trojan TROJAN AGM range. [The full range of Trojan batteries](https://bateriasonline.es/en/trojan-batteries)

## Equivalents and alternatives to the Trojan 31-AGM

Other AGM batteries that fit the 31-AGM's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Dimensions (mm) |
|---|---|---|---|
| Trojan OverDrive AGM 31 | AGM | 102 Ah | 341 × 173 × 234 |

## Trojan 31-AGM vs OverDrive AGM 31 and SAGM 12 105: which one to choose?

What sets the 31-AGM apart from its neighbours in the Trojan range:

| Model | Capacity | Dimensions (mm) | Weight |
|---|---|---|---|
| Trojan 31-AGM (this one) | 100 Ah | 341 × 173 × 233 | 31 kg |
| Trojan OverDrive AGM 31 | 102 Ah | 341 × 173 × 234 | 31 kg |
| Trojan SAGM 12 105 | 105 Ah | 325 × 173 × 237 | 30 kg |

- Trojan OverDrive AGM 31: 2 Ah more, the same dimensions.
- Trojan SAGM 12 105: 5 Ah more, a different case (325 × 173 × 237 mm).

## Inside the 31-AGM: AGM technology

Inside, the 31-AGM has glass fibre separators (AGM) that hold the electrolyte. It is fitted in cars with advanced Start-Stop and in deep-cycle equipment.

## What to look at before buying the 31-AGM

- Length, width and height of the 31-AGM: 341 × 173 × 233 mm.
- Your current battery should say about 100 Ah; a little more is also fine.

## Part numbers and codes for the Trojan 31-AGM

Shops, garages and catalogues identify the 31-AGM with these codes:

| Commercial reference | 31-AGM |
|---|---|
| EAN | 8404653001537 |
| Not to be confused with | Trojan U1-AGM (33 Ah) |

## Frequently asked questions about the Trojan 31-AGM

### 31-AGM or OverDrive AGM 31: which one suits me?

Compared with the 31-AGM, the Trojan OverDrive AGM 31 has 2 Ah more. With 102 Ah, the OverDrive AGM 31 runs longer between charges than the 31-AGM (100 Ah). Both measure 341 × 173 × 233 mm, so they fit the same tray.

### How much does the Trojan 31-AGM weigh?

31 kg, with 100 Ah of capacity. For reference, the Trojan OverDrive AGM 31 (102 Ah) weighs 31 kg.

### Which battery is equivalent to the Trojan 31-AGM?

Only other AGM batteries with its dimensions and polarity: Trojan OverDrive AGM 31. Neither an EFB nor a conventional battery replaces the 31-AGM.

### How far can I discharge the Trojan 31-AGM each day?

To make it last years, do not go below 50% routinely. Size the bank so daily consumption is half the installed capacity.

## More batteries to compare with the 31-AGM

- [Other solar batteries for off-grid systems](https://bateriasonline.es/en/off-grid-solar-batteries)
- [The whole Trojan range](https://bateriasonline.es/en/trojan-batteries)
- [Long CWP100-12N](https://bateriasonline.es/en/long-cwp100-12n) · 100 Ah, 338×170×217 mm

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