Looking for battery monitor recommendations - SailNet Community
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post #1 of 31 Old 3 Weeks Ago Thread Starter
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Looking for battery monitor recommendations

The battery monitor I purchased appears to be junk.

It tells me that overnight I drain 150 AH from the house bank. If the refrigerator were running constantly it will still only deplete about 60 AH and it's not running constantly. My estimate is that I use about 20 AH between sunset and sunrise ... so this thing appears to be off by a factor of 7.

I obviously need a new one. I expect that all I really need is something that will accurately track amps used and amps replaced so I can make a reasonable estimate of SoC at any point in time. Really, the only thing I _need_ to know is whether the SoC is low enough that I should run the engine for a while (in the event that the solar can't keep up for some reason).

So ... recommendations?
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Re: Looking for battery monitor recommendations

Read the voltage
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Re: Looking for battery monitor recommendations

For lead SoC, not Ah counting

Merlin SmartGauge

Lead or LFP, Ah counting

Victron BMV-712
Xantrex Link Pro
Bogart Trimetric TM-2030*

Balmar SG-200 but IMO too new.

If you want integration with shore charging, Magnum w/ 'Advanced' remote control ARC / BMK

Go here https://marinehowto.com And CTRL-F for battery monitor and read closely those three articles
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Re: Looking for battery monitor recommendations

See Maine Sail's article on State of Charge:

https://marinehowto.com/under-load-b...oltage-vs-soc/

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Re: Looking for battery monitor recommendations

I have the Victron BMV-712. It’s been a solid purchase. The phone app is quite nice and I’ve used it to really dial in the necessities and what their impact is to our battery.
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Re: Looking for battery monitor recommendations

Link20 seems to be OK for 2 banks. All the fancy functions like SOC are hard to use and keep synchronized. Ammeter and voltage function work beautifully... and that's really all you need.

Your system needs to be properly set up... batteries of the capacity to match typical loads without repeatedly going to deep discharge - charge cycles. That's what shortens battery life. Essentially you'll want a lot more battery capacity than typically needed. Alt charging sources are a good thing to have as when you are away from the boat they are topping up your batteries and you don't rely on a alternator.

Discontinued product...

pay attention... someone's life depends on it

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Re: Looking for battery monitor recommendations

Have a phillipi system. Monitors solar and wind input individually as well as both banks. Get running count of input from each source, instantaneous input, voltage and %of charge of each battery bank. Also the shunts measure current input/draw from the batteries. Input from alternator and generator isn’t split but can be inferred by which one is running.
Information is helpful as you get an idea not only about your batteries but also draw from each piece of equipment and your various inputs.
Also get via ultrasound amount in each of 4 fuel tanks, 2water tanks and 2holding tanks.
Takes awhile to set up but then one and done. Biggest plus is tank monitors actually work and everything is accessible on one little (~3 x3”) screen.
Also have voltages on the electrical panel.
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Re: Looking for battery monitor recommendations

Second the Victron 712. Reasonably priced
Easy to read and understand.


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Re: Looking for battery monitor recommendations

I've been using a Blue Sea System, M-2 1834 battery multimeter and it works flawlessly to monitor exactly what goes into and the draw on my house batteries.
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Re: Looking for battery monitor recommendations

Quote:
Originally Posted by capta View Post
I've been using a Blue Sea System, M-2 1834 battery multimeter and it works flawlessly to monitor exactly what goes into and the draw on my house batteries.
That is a DMM, V&A instantaneously only, no Ah totalizing.

Usually to call a given gadget a BM, needs to at least be trying to guesstimate SoC.
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