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 > What's a good battery level monitor?

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naturist

Lynchburg, VA

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Posted: 11/17/20 07:16pm Link  |  Quote  |  Print  |  Notify Moderator

Victrons are spendy. Try this: Clicky





time2roll

Southern California

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Posted: 11/17/20 07:46pm Link  |  Quote  |  Print  |  Notify Moderator

Since you don't mention any inherent issues with the existing method I recommend getting a panel mount LCD voltmeter.

https://www.amazon.com/Display-Voltmeter-Digital-Voltage-Backlight/dp/B07Q21N5ZW

[image]

Otherwise I recommend the Victron.


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rlw999

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Posted: 11/17/20 08:25pm Link  |  Quote  |  Print  |  Notify Moderator

obiwancanoli wrote:



Go to www.amazon.com, type "Victron 712" in the search box at the top of the page....


That's a good way to find the Victron 712, but @HomelessByChoice was asking about the picture that @MrWizard posted, which is not a Victron.

I'd like to know too.

I found what I think is a product link for it based an image search, the DROK Automotive Multimeter, but that link leads to an error page, so apparently it's been discontinued. But Drok sells many other inexpensive meters, so I'd still like to know if @MrWizard has been happy with their products.

* This post was edited 11/17/20 08:37pm by rlw999 *

FWC

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Posted: 11/17/20 08:52pm Link  |  Quote  |  Print  |  Notify Moderator

The OP did ask for a 'good' meter not necessarily a 'cheap' battery monitor. For a good meter, you can't go wrong with the Victron 712 (with a display) or the Victron SmartShunt if you are happy to look at the data on your phone/tablet/laptop. If you would prefer 'cheap' then any of the many no-name panel voltmeters or current shunts will work.

SJ-Chris

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Posted: 11/17/20 09:02pm Link  |  Quote  |  Print  |  Notify Moderator

I recently posted this:
https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/30168196.cfm

Aili battery monitor is what I am using and I love it. And it's only ~$45 on Amazon. Gives you all the info you probably want/need. Doesn't connect to your phone, but it's way less expensive.

FWC

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Posted: 11/17/20 09:11pm Link  |  Quote  |  Print  |  Notify Moderator

The issue with many (most?) of the cheaper battery monitors is that they don't resynchronize with a fully charged battery, and they don't account for charging efficiency. As a result they can drift well away from the true SOC over time, which can provide confusing information.

Better monitors will detect when your battery is fully charged (based on the charger switching over to float) and will reset the SOC back to 100% and will also account for the fact (with lead acid) that you need to put 21A back in to replace the 20A you took out.

MrWizard

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Posted: 11/17/20 10:29pm Link  |  Quote  |  Print  |  Notify Moderator

Charging inefficiency is a problem that never goes away with any lead acid battery, and only gets worse as the battery ages,
That's why an auto reset monitor, is not as important to me , as knowing my batteries and system,I know by looking at the charge amps near the end of cycle, the monitor already says 100%,

What's important to me, is the discharge count and the SOC from my use, so I know how many Amp hrs were used, Capacity (50% ,70%, 90% ?) right now
I know whether I must charge right away or have sufficient unused capacity to hold me until later in the day,
I do not know how many Amp hrs recharge it takes to replace 100 Amp hrs used, 5 more, 10 more, 15 more ??
And it's been many years since I even attempted to find out, when I tried I had (2) amp counting power meters wired in series with the house batteries in a different MH, identical meters,they only counted one direction, so I installed them in reverse to each other, one only counted discharge , the other only counted charging , I reset them each day at the end of that days recharge, I don't remember the numbers, but the recharge to full, goto float, was more than I expected, no MW no coffee maker , a 300w inverter for the laptop, tv, and phones, it was about 2005 I think, maybe before then
This monitor I have now, is the best one I have used, the most useful,the most info
I will try to find the brand/model info, it's been almost 3 years, and I think the seller was in kentucky, I'm thinking this was on eBay,
BTW the display/control module (in the picture) is powered 5v usb, and is wireless,
The brain module and the Hall Effect Sensor are located at the 198 ampHR Deka 4D AGM that is one half of my 400 AmpHR battery bank, there is No Wiring connecting the 2 modules, I can move the display any where in the RV, without changing any wiring

* This post was last edited 11/18/20 09:01am by MrWizard *   View edit history


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MrWizard

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Posted: 11/18/20 12:19am Link  |  Quote  |  Print  |  Notify Moderator

This is the seller elite.element on EBay, I bought from, and the power monitor, he is in Walton Ky,,
DC battery power monitor

It's all over ebay for less $$$ , but shipping from China sellers,
I think he was the first one to bring it to the USA

[image]
[image]Click For Full-Size Image.

* This post was edited 11/18/20 01:01am by MrWizard *

StirCrazy

Kamloops, BC, Canada

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Posted: 11/18/20 05:29am Link  |  Quote  |  Print  |  Notify Moderator

this is the one I recomend. accurate, simple and deicent shunt.

https://www.amazon.com/AiLi-Battery-Moni........7GGP4M&psc=1&refRID=XBNJSY5Z5WY7NH7GGP4M


Steve


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phemens

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Posted: 11/18/20 08:15am Link  |  Quote  |  Print  |  Notify Moderator

dieseltruckdriver wrote:

phemens wrote:

I like the Victron 702, with Bluetooth so you can monitor from your phone.

I really like my Victron 702 also, but the 712 is the one with bluetooth, unless you add a dongle.


You're right, I have the dongle, thanks for the clarification!


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