Battery Monitor for small system that is off most times?

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Battery Monitor for small system that is off most times?

Postby Jman » Sat Dec 15, 2018 9:11 pm

From what I can gather by reading some battery monitor manuals online is the monitors actually need to spend time getting to know the battery as it cycles & be calibrated for accurate results.

If the battery gets disconnected out of the setup for some time & put back in later will the monitor need to get to know the battery again?


Just wanting an accurate basic monitor for a system where the battery gets shut off from everything & when I want to use/reconnect the battery again I don't have to do anything with the monitor.

Is there such a monitor I could use?

thanks
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Re: Battery Monitor for small system that is off most times?

Postby jules » Mon Dec 17, 2018 8:06 am

Jman wrote:From what I can gather by reading some battery monitor manuals online is the monitors actually need to spend time getting to know the battery as it cycles & be calibrated for accurate results.

If the battery gets disconnected out of the setup for some time & put back in later will the monitor need to get to know the battery again?
thanks


Impossible to generalize for all monitors or regulators but usually they will start afresh if the battery is removed and replaced. This shouldn't be a problem though. The big issues for batteries are the depth to which they are discharged and maybe in this case [?] the length of time they're left in a discharged state.

In what situation do you see the battery getting "shut off from everything", how long would it be in that state and are there any particular reasons that this could be problematic?
Primary system: .8KW Trina panels; Plasmatronics PL40; 1,000Ah VRLA 12X2V battery bank; 1.7KW Selectronic inverter. Off grid for 30 years.

Spares; 5 x 12V, 1,000 Ah batteries plus a couple of regulators
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Re: Battery Monitor for small system that is off most times?

Postby Jman » Tue Dec 18, 2018 6:04 pm

Hi jules

I think this idea is not gonna happen now, reading alot how ah counters require real capacity testing. other inputs like peukerts exponent & CEF etc. Too much work I think.

In storage and not being used I shut off battery by turning off switch so it avoids parasitic drains & less wear on components. Usually stays in storage for 2-3months before getting a top up charge by AC. And used a handful of times a year.
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Re: Battery Monitor for small system that is off most times?

Postby davidg » Wed Dec 19, 2018 3:49 am

Batteries tend to last better if there on a smart charger in float most of time when not in use
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Re: Battery Monitor for small system that is off most times?

Postby jules » Wed Dec 19, 2018 7:02 am

Jman wrote:Hi jules

I think this idea is not gonna happen now, reading alot how ah counters require real capacity testing. other inputs like peukerts exponent & CEF etc. Too much work I think.
.


I think you might be over-complicating things here Jman.

davidg wrote:Batteries tend to last better if there on a smart charger in float most of time when not in use


As davidg says, the best option for battery life is to use a [small, good quality] smart charger [available from places like Supercheap] and vastly prolong your batteries' life. Is there an AC source where you store the battery?
Primary system: .8KW Trina panels; Plasmatronics PL40; 1,000Ah VRLA 12X2V battery bank; 1.7KW Selectronic inverter. Off grid for 30 years.

Spares; 5 x 12V, 1,000 Ah batteries plus a couple of regulators
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