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Old 25-06-2014, 08:45   #31
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Re: Victron bmv600 confusion

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Originally Posted by Ex-Calif View Post
Manual resets...
You think doing a manual reset is a problem? It takes a couple of seconds.

I have my voltage programmed for reset at 14.5V and charge via a solar panel. The only way it resets is if the batteries are charged AND the sun is high in the sky since the voltage from the solar wouldn't get that high till the batteries are almost fully charged. I haven't done a manual reset in 2 months but can tell by the voltage in the morning that the SOC is reading close enough to expected to not worry about it. Some people seem to be too worried about whether the batteries are at 100% or 98% SOC by the meter when they don't really know the actual battery capacity to start with.

A BM is just a tool, not a physics law!
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Old 25-06-2014, 09:56   #32
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Re: Victron bmv600 confusion

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Originally Posted by sailorboy1 View Post
Why? All the problems over the years I've read of (including mine) where the BMV reset too early are due to not setting the voltage high enough to ensure that the battery had to be in absorption when the low amp setpoint is reached.
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Originally Posted by Ex-Calif View Post
Manual resets...
Quote:
Originally Posted by sailorboy1 View Post
You think doing a manual reset is a problem? It takes a couple of seconds.

I have my voltage programmed for reset at 14.5V and charge via a solar panel. The only way it resets is if the batteries are charged AND the sun is high in the sky since the voltage from the solar wouldn't get that high till the batteries are almost fully charged. I haven't done a manual reset in 2 months but can tell by the voltage in the morning that the SOC is reading close enough to expected to not worry about it. Some people seem to be too worried about whether the batteries are at 100% or 98% SOC by the meter when they don't really know the actual battery capacity to start with.

A BM is just a tool, not a physics law!
Ok - I think the answers are not matching the questions. And i may be the cause.

You said the problems are caused by the reset voltage being too low, I intended to respond by saying use manual resets - that's what learned folks (like mainsail) say to do. Set the reset voltage higher than the system will see and never get an automatic reset.

Your experience may be different but many believe (like me) that the state of the battery (actual capacity) may not be accurately reflected at the current time because of the operator not the equipment.

Needing to know puekert numbers, battery temps, 20 hour discharge rates etc. to get accurate SOC is a PITA and I'm not up for that - Smartgauge is better - apparently - at least I like the concept. Plug it in and algorithms do the rest..

Then there are those that say - I'm fine with just knowing voltage - Then you don't need BMV either you just need a much cheaper but accurate voltmeter.

These are just the conclusions I came to for me- I like my technology to unload my task list not add to it.

- I want accurate SOC - Smartgauge is the easiest and best shot at that as far as anyone knows
- I want to count amps in/out cum in cum/out
- I want to display voltage

For the last two I have found nothing that will do that for a reasonable price except BMV602.

What I am saying is that for me I will not bother to calibrate the SOC of BMV - I'm pretty lazy...

Sorry for the confusion.
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Old 25-06-2014, 10:18   #33
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Re: Victron bmv600 confusion

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What I am saying is that for me I will not bother to calibrate the SOC of BMV - I'm pretty lazy...

I just told you that I have found no need to reset my BMV for months, how much more lazy are you looking for?
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Old 25-06-2014, 10:32   #34
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Re: Victron bmv600 confusion

I have been using a Victron bat monitor for three years and love it. It makes monitoring my batteries health much easier. But it doesn't tell me anything that a volt meter, a bat temp gauge, an amp meter, and some arithmetic won't say.

A couple of thoughts from reading previous posts: The monitor must be installed and calibrated properly. Mine is in the salon, not at the helm, because I want to read battery data when I am at anchor. Be sure to connect the bat temp wire, and input your batteries actual capacity, not the manufacturers rating when new. The Victron has a programable relay, and I set mine up to illuminate a bright red led when the batteries get down to 50% charge (as determined by voltage). This tells me to manually start the generator, although it could also be used to automatically start a generator. As for SOC, the number on the screen is a rough guide, and depends partly on rate of charge (and discharge). Time To Go to 50% discharge is actually more useful as I can use it to determine in advance when I will likely have to start the generator. A wind turbine or solar panels will make this number less relevant.
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Old 25-06-2014, 12:00   #35
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Re: Victron bmv600 confusion

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....I've been Googling but have not found a (cheap) gauge that simply does that. I haven't looked everywhere but certainly a lot of the major boat and solar suppliers...
Try ebay - from 5$ to 50$, but some come without shunts. You want at least a 100 Amp shunt.
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Old 25-06-2014, 12:15   #36
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Re: Victron bmv600 confusion

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Originally Posted by Ex-Calif View Post
I am reconciled to buying both BMV and Smartgauge and ignoring the BMV SOC. IN the big scheme of things it's $160 over the cost of the SmartGauge.
It can't hurt!

If you have both, you can use the Smartgauge to help calibrate the Victron, and then you can compare both gauges to really get a higher level of an accurate picture of SOC.

The only question is why you need that much accuracy? But it certainly doesn't hurt anything.
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Old 25-06-2014, 12:58   #37
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Re: Victron bmv600 confusion

So, for FLA, what's considered 100% charged?

The BMV defaults to =>13.2v and <=.04C for 3 minutes.
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Old 25-06-2014, 13:18   #38
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Re: Victron bmv600 confusion

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So, for FLA, what's considered 100% charged?

The BMV defaults to =>13.2v and <=.04C for 3 minutes.
I have mine set to 14.4V and 6 amps for 5 minutes for my 440AH bank.

I charge with solar and it would hit 13.2V at 8am on a sunny day with batteries less than 90% SOC.
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Old 25-06-2014, 13:34   #39
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Re: Victron bmv600 confusion

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I have mine set to 14.4V and 6 amps for 5 minutes for my 440AH bank.

I charge with solar and it would hit 13.2V at 8am on a sunny day with batteries less than 90% SOC.
13.2V with less than 17.6amps?

Ah, yes solar may not be putting out that much, I understand, hence you have to raise the voltage.
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Old 25-06-2014, 16:59   #40
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Re: Victron bmv600 confusion

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I just told you that I have found no need to reset my BMV for months, how much more lazy are you looking for?
I apologize but I'm still not sure what you are trying to advise here. You do not do manual resets, I understand.

Do you calibrate the SOC per the manual?

How often?
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Old 25-06-2014, 17:05   #41
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Re: Victron bmv600 confusion

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I apologize but I'm still not sure what you are trying to advise here.
I'm not advising anything I'm just telling you what I do and that it works.

Other than that since I have nothing to gain and no reason to convince anyone; that's all folks.
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