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Almot

out there

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Posted: 02/12/18 06:50pm Link  |  Quote  |  Print  |  Notify Moderator

What red31 said.

Voltmeter for SOC is like a broken clock that is right twice a day.
With voltmeter it will be only once a day, - after 12 hours rest.

2oldman

Blanding UT

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Posted: 02/12/18 07:35pm Link  |  Quote  |  Print  |  Notify Moderator

Almot wrote:

Voltmeter for SOC is like a broken clock that is right twice a day..
It's close enough.

red31

Bryan

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Posted: 02/12/18 07:58pm Link  |  Quote  |  Print  |  Notify Moderator

get a meter that reads 75% all the time. a little test done by BFL shows 65%-100% when the voltage is 14.4v!

[image]

MrWizard

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Posted: 02/12/18 09:03pm Link  |  Quote  |  Print  |  Notify Moderator

there is no hand held soc meter, except a hydrometer

you need a meter mounted inline, that counts the amp hours

you fully charge the batteries to the point that they are accepting less than 1 amp per battery at 14.8v,
now fully charged you program the meter with the total ampHr capacity of the bank

now that meter will display the SOC by counting ampHrs in / out and compute the percentage


Radiate The Happy
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Almot

out there

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Posted: 02/12/18 11:05pm Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

It's close enough.

Marginally better than OEM panel with indicators Full/Empty for black tank and batteries.

What he wants - handheld digital SOC meter - doesn't exist, except for once a day with a rested battery.

ksg5000

Oregon

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Posted: 02/13/18 03:51am Link  |  Quote  |  Print  |  Notify Moderator

If your looking for something simple and inexpensive you can use a plug-in voltmeter combined with one of the battery tables already posted. I keep something similar plugged in all the time so I can monitor my converter -- rig needs to be disconnected and battery rested b4 trying to measure status of batteries.


Kevin

RJsfishin

Winston Or.

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Posted: 02/13/18 08:08am Link  |  Quote  |  Print  |  Notify Moderator

10.5 volts can mean anything between near Full, and stone dead,...all depends on the load at the time.

In reality, once you are experienced at off grid camping, you won't have much use for battery monitoring. My living habits don't change, so its just routine, charging x amount of hrs per day, keeps it all going fine.
The exception to that would be if you have inconsistent solar charging, that could affect generator run time. But on full sun days, everything will be routine.


Rich

'01 31' Rexall Vision, Generac 5.5k, 1000 watt Honda, PD 9245 conv, 300 watts Solar, 150 watt inv, 2 Cos 6v batts, ammeters, led voltmeters all over the place, KingDome/sat, 2 Oly Cat heaters, and towing a 2012 Liberty, Lowe bass boat, or a Kawi Mule.


2oldman

Blanding UT

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Posted: 02/13/18 09:28am Link  |  Quote  |  Print  |  Notify Moderator

Almot wrote:

2oldman wrote:

It's close enough.
Marginally better than OEM panel with indicators Full/Empty for black tank and batteries..
So all these charts showing voltage and percentage of charge are, what.. nonsense?

Almot

out there

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Posted: 02/14/18 12:50pm Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

So all these charts showing voltage and percentage of charge are, what.. nonsense?

Those tables are "approximate".
Open-circuit tables make sense. The longer it had rested, the correct-er they become.
Under-load tables depend on the load.

Tables during charging - I think you know the answer [emoticon]... The could be graphs for charging process, not simple tables like those linked above, and it depends on what battery and what charger. 3-stage charger may generate a graph different from the one by BFL13.

MEXICOWANDERER

las peƱas, michoacan, mexico

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Posted: 02/14/18 02:27pm Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

Almot wrote:

Voltmeter for SOC is like a broken clock that is right twice a day..
It's close enough.




These folks would tend to agree...

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