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Old 03-12-2018, 19:19   #1
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Boat: 1981 Bristol 32 Sloop
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Inexpensive Battery Monitoring Devices

MICTUNING DC 6.5-100V 0-100A LCD Digital Display
- Ammeter - Amps
- Voltmeter - Volts
- Multimeter - Multiple locations
- Power - Watts
- Energy - Watthour
$17

Monitor Dishcharge and Charging separately. See
https://www.amazon.com/dp/B01JOUZELG...v_ov_lig_dp_it

Includes a 100A/75mV Shunt, accurate to 0.5%
Convert Watthour to aH
Simply divide by the average voltage.

Would be interested in what others have found.
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Old 03-12-2018, 19:49   #2
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Re: Inexpensive Battery Monitoring Devices

I would call these AH meters.

A full-fledged BM should include settings for Peukert coefficient and CEF.

$17 is very inexpensive for 100A capacity, the ones I see on eBay are usually 2-3x that.
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Old 06-12-2018, 09:08   #3
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Re: Inexpensive Battery Monitoring Devices

I prefer a true battery monitor. It may require effort to keep calibrated, but I at least want a % battery used or remaining. The amps and volts are nice to see what is happening while it is happening.
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Old 06-12-2018, 10:04   #4
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Re: Inexpensive Battery Monitoring Devices

At a low enough price, great to be able to measure specific device draws, or a source's individual contribution,

as well as tracking overall bank SoC with a separate proper BM.

Think of it as an "accumulating ammeter", can be made portable by inserting Anderson plugs if there are particular circuits you want to rotate between regularly.

Anyone ever see one using clamps rather than requiring an inline shunt?
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