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Description
- Shunt Rating: 500A
- Battery Capacity Range: 10–999Ah
- Supply Voltage: 10–100V
- Accuracy: ±1% voltage and current
- Compatible With: Lithium, lead-acid, NiMH
The iTECHBM500 Battery Monitor with 500A Shunt
Guessing at battery voltage tells you almost nothing about how much power you've actually got left. The BM500 puts a 500A shunt in the negative line and counts every amp-hour going in and out, so the display shows real state of charge rather than a rough voltage reading.
Real-Time Amp-Hour Counting
The 500A shunt tracks charging and discharging current and calculates the amp-hours flowing in and out of the battery. A separate field-installed sense wire reads voltage directly at the battery, so what you see on screen is what the battery is actually doing — not an estimate taken from somewhere down the circuit.
Accurate to 1%
Voltage and current are both measured to within ±1%. That accuracy is what makes the state-of-charge figure worth trusting when you're deciding whether to run the fridge another night or start the generator.
Works Across the Range
Compatible with lithium, lead-acid and nickel-metal hydride batteries, with a supply voltage range of 10–100V and a capacity range of 10–999Ah. That covers a single 100Ah 12V house battery through to a large 24V or 48V off-grid bank.
Digital LCD Display
Everything on one screen, with adjustable brightness. The monitor itself draws under 2mA with the screen off, under 20mA at 10% brightness and under 60mA at full brightness, so it isn't meaningfully adding to your overnight draw.
Mounting and Installation
The display mounts through a 106 x 81 x 18mm bracket with 95 x 70mm fixing points, and connects to the shunt via the supplied 3m shielded cable so you can put the screen where you'll actually see it. Bracket, screws, shunt holder and sense wire are all in the box. The monitor is rated IP20, so mount it inside the van, canopy or cabin where it's protected from moisture.
Warranty
Covered by a 12-month statutory warranty from date of purchase, in addition to your rights under the Australian Consumer Law. Support is handled here in Australia — speak to a Power Expert on 1300 483 249, Monday to Friday 8:30am to 5pm AWST.
What's in the Box
- 1 x iTECHBM500 Battery Monitor
- 1 x 500A shunt
- 1 x Shunt holder
- 1 x Shielded wire (3m)
- 1 x B+ sense wire, 22AWG (1m)
- 1 x Plastic bracket
- 4 x Screws
- 1 x Instructions
Maximum measured current500A
Supply voltage10–100V
Battery capacity range10–999Ah
Voltage accuracy±1%
Current accuracy±1%
Battery compatibilityLithium, lead-acid, nickel-metal hydride
Screen off<2mA
Screen brightness at 10%<20mA
Screen brightness at 100%<60mA
Exterior bracket dimensions (L x W x H)106 x 81 x 18mm
Mounting bracket points (L x W)95 x 70mm
Monitor backing dimensions (L x W x H)80 x 59 x 16mm
Shielded cable length3m
B+ sense wire22AWG, 1m
IP ratingIP20
Operating temperature-20°C to 80°C
Warranty1 year