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Old 07-08-2013, 01:45 PM   #11
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Is 50% the same on all batteries or how do you know how many volts it is at 50%?
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Old 07-08-2013, 05:05 PM   #12
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I use this chart showing DC Voltage verses deep cycle battery state of charge



This gives me an approximate state of charge. To be more specific you should use the specific gravity of the electrolyte method for each cell.

Hasn't let me down yet just reading the DC VOLTAGE and it is slowly being discharged.

When it gets around 12.0VDC I go into battery disconnect mode until I am able to do my re-charge battery routine...

Roy ken
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Old 07-08-2013, 08:17 PM   #13
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Ok that is very helpful thanks.
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Old 07-10-2013, 10:27 AM   #14
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I like it! Couple of questions -

- the link on the ebay auction says in one place up to 99.9 but then in the specs says 0-9.99 volts...can you verify that is the right one?
- Did you check the accuracy with a known good meter? I have had a couple of those cheap meters be off quite a bit - is it pretty accurate?
- Do you know how much current it draws? Thinking about putting a switch on mine so it wont drain the battery.

thx!
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Old 07-10-2013, 11:13 AM   #15
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Quote:
Originally Posted by Terry View Post
I like it! Couple of questions -

- the link on the ebay auction says in one place up to 99.9 but then in the specs says 0-9.99 volts...can you verify that is the right one?
- Did you check the accuracy with a known good meter? I have had a couple of those cheap meters be off quite a bit - is it pretty accurate?
- Do you know how much current it draws? Thinking about putting a switch on mine so it wont drain the battery.

thx!
Terry...it's a convoluted auction description to say the least! The Main Auction Description and picture shows a XX.X Meter and that's what I received. However, I must add that I received a (3) wire meter vs the (2) wire meter as pictured. It was no problem as I simply tied the source and variable voltage wires together. The meter I received had a wide source operating range (something like 3-99VDC)

I did not check the meter accuracy with my (2) digital meters...however, there is a tweaking potentiometer on the back (should the meter voltage be off)

Lastly, I wasn't worried about the draw as I wanted the meter visible at all times. I wanted the meter (off) to give me a visual that I had disconnected the battery. However, I bunched plenty of slack to add a switch later if I changed my mind. The in-line blade fuse I installed is easy access and I can pull that if I want to kill the meter.

Hope that helps! - B
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Old 07-10-2013, 11:51 AM   #16
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Terry...it's a convoluted auction description to say the least! The Main Auction Description and picture shows a XX.X Meter and that's what I received. However, I must add that I received a (3) wire meter vs the (2) wire meter as pictured. It was no problem as I simply tied the source and variable voltage wires together. The meter I received had a wide source operating range (something like 3-99VDC)

I did not check the meter accuracy with my (2) digital meters...however, there is a tweaking potentiometer on the back (should the meter voltage be off)

Lastly, I wasn't worried about the draw as I wanted the meter visible at all times. I wanted the meter (off) to give me a visual that I had disconnected the battery. However, I bunched plenty of slack to add a switch later if I changed my mind. The in-line blade fuse I installed is easy access and I can pull that if I want to kill the meter.

Hope that helps! - B
Thanks....that guy has some pretty neat tinkering stuff...... I might need to get one of his voltage and amp meters and try it out. I have always wanted to monitor DC current as well as I do on the AC side with my EMS. It looks like his show negative current as well so I could monitor both battery pull and charge output
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Old 06-13-2014, 06:13 AM   #17
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Nice idea guys. Question for RoyBraddy. where did you get all three of those meters? Thanks
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Old 06-13-2014, 06:45 AM   #18
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There is a company in the US called Datel that sells all sorts of panel meters. Not for $10 from Hong Kong on Ebay price, but they look pretty good. http://www.datelmeters.com

The sell one that measures AC volts, AC current, Hz, and watts, along with all sorts of DC volt and amp meters.
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Old 06-13-2014, 07:19 AM   #19
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CHUCKWORKB - I got my meters from SURE ELECTRONICS ebay/china some six years ago now... Good prices on all three meters then. Now the HALL EFFECT +/- 75AMP DC CURRENT is not available anymore and the only place I find the exact unit cost over $800.. Sure wish I bought several from SURE ELECTRONICS when they were $30...

Plenty of the 2" by 3" Digital AC and DC meters this size on the markets now at good prices. Just do a google search and when it loads up select IMAGES and pick your poision....

I need to get a DC VOLTMETER installed in my 2010 F150 truck dash. It has an unused hole already there I can use. I would like to watch the Truck Alternator go through its smart mode charging as well...

One post above said something about it being a good NITE LIGHT. My meters were super bright at night. Made me install an ON-OFF switch in the trailer for them...

Ordering from ebay/china is a great way to go for good prices. Delivery is just a few days - Didn't have to pay any extra fees to get them here. I imagine some items are drop shipped from a stateside location. Using PAYPAL is a great insurance for what you are getting to your satisfaction...

Roy Ken
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RETIRED DOD DOAF DON CONTRACTOR Electronics Tech 42YRS

"We're burning daylight" - John Wayne
2008 STARCRAFT 14RT OFF-ROAD POPUP with PD9260C and three 85AH 12VDC batteries
2010 F150 FX4 5.4 GAS with 3.73 gears - Super Cab - Towing Package - 2KW Honda EU2000i Gen
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Old 06-19-2014, 06:20 PM   #20
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You may want to compare your meter's output with that of a VOLT meter. If need be, you can fine tune the voltage reading on the meter by turning the little PHILLIPS slotted Potentiometer (POT) on the back side of the meter. One of my meters was .5volts off the other was .3volts off, and I had one that was right on the money. Just do not put much pressure on the POT. .

Don
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