---
title: "CoolMax Battery Sense — Datasheet"
revision: "1.0.0"
publisher: AERL (Australian Energy Research Laboratories)
url: https://www.aerl.com.au/docs/coolmax-battery-sense-datasheet
pdf: https://www.aerl.com.au/documents/datasheets/AERL_CoolMax_Battery_Sense_Datasheet_REV_100.pdf
description: "Technical specifications for the CoolMax Battery Sense remote battery temperature and voltage sensor for CoolMax SRX controllers."
---

# CoolMax Battery Sense — Datasheet

*Rev 1.0.0. Markdown copy of the AERL document at https://www.aerl.com.au/docs/coolmax-battery-sense-datasheet; the PDF (https://www.aerl.com.au/documents/datasheets/AERL_CoolMax_Battery_Sense_Datasheet_REV_100.pdf) is the controlled version.*

# Battery Sense

Remote Temperature and Voltage Sensor

**18–200Vdc** Voltage sense input

**CANRJ45** To the CoolMax SRX

**12V / 2 A** Float output relay

**0.1W** Idle consumption

## Specifications

Battery Sense · BAT-SENSE

The Battery Sense is an accessory for the AERL CoolMax SRX solar charge controller. Mounted beside the battery bank, it measures the battery’s temperature and its voltage at the terminals and sends them to the SRX over CAN bus, so the controller compensates its charging for temperature (factory default 50 mV/°C per bank, set in AERL Link) and monitors the battery more accurately. Use it on banks that do not report their own temperature, typically flooded or sealed lead-acid; a battery whose BMS reports its temperature over CAN, such as an AERL LiFe², needs no Battery Sense.

![Battery Sense top view with the three LEDs](https://www.aerl.com.au/docs/_assets/assets/images/battery-sense/aerl-battery-sense-mechanical-top-unlabelled.png) ![Voltage input side, 18–200 V](https://www.aerl.com.au/docs/_assets/assets/images/battery-sense/aerl-battery-sense-mechanical-side-power.png) ![Termination switch side, 120 Ω on / off](https://www.aerl.com.au/docs/_assets/assets/images/battery-sense/aerl-battery-sense-mechanical-side-on-off.png)

![Connector side: CAN, USB, RLY and IN](https://www.aerl.com.au/docs/_assets/assets/images/battery-sense/aerl-battery-sense-mechanical-front.png)

*Top view, voltage input and termination switch sides, connector side (CAN · USB · RLY · IN). Not to scale.*

### General

### Electrical

### Communication

### Environmental

- Temperature-compensated charging from the battery’s own temperature
- Battery voltage read at the battery terminals
- Float switch input and float indication relay for other chargers
- Data and power over one CAN cable to the SRX

AERL reserves the right to change any product, product specifications and data without notice to improve reliability, function, or design or otherwise.

#### Manufactured by

**Australian Energy Research Laboratories** 1/75 Bluestone Circuit, Seventeen Mile Rocks QLD 4073

#### Origin and warranty

Australian made 2-year warranty

#### Contact

sales@aerl.com.au 1800 950 865 aerl.com.au