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Old 11-11-2022, 08:42 AM   #1
mrmotoguzzi00
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Default Battery Meters for Lithium... Roypow could be better :)

Looking for a better meter for my Roypow 48v 105ah battery.... Recently installed an Eco Battery in another club car and the meter is much better than the very basic led bar meter i got with the Roypow.

Been poking around and came across a couple but figured i'd toss it out here to see if anyone has any real life experience with theirs :)

Thanks

Mike
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Old 11-11-2022, 09:45 AM   #2
nathank
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Default Re: Battery Meters for Lithium... Roypow could be better :)

https://www.renogy.com/500a-battery-monitor-with-shunt/
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Old 11-11-2022, 10:14 AM   #3
Tom47
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Default Re: Battery Meters for Lithium... Roypow could be better :)

The Renogy is probably the best available.

The CAN meter now sold by EB is only able to connect to the newer EB's.

However, an identical meter to the ones EB had in the gen1 kit like mine is available on line for less than $40.00 and would work great with your Roypow.
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Old 11-11-2022, 10:42 AM   #4
CP241
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Default Re: Battery Meters for Lithium... Roypow could be better :)

3rd vote for the renogy. I have one in my club car and love it.

I’ve used the Victron energy meter many times in the past as well. It’s pricey, but very nice and offers a Bluetooth app where you can gather additional information as well.
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Old 11-11-2022, 10:59 AM   #5
jasonojordan
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Default Re: Battery Meters for Lithium... Roypow could be better :)

Are monitors with the Shunt more accurate then ones without or?
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Old 11-11-2022, 11:24 AM   #6
Volt_Ampere
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Default Re: Battery Meters for Lithium... Roypow could be better :)

You really need a shunt to accurately monitor LiFePO4 batteries for SOC. Voltage alone won't cut it.
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Old 11-11-2022, 12:47 PM   #7
CP241
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Default Re: Battery Meters for Lithium... Roypow could be better :)

Quote:
Originally Posted by jasonojordan View Post
Are monitors with the Shunt more accurate then ones without or?
Yes shunts are necessary with lifepo4 batteries.

With lead acid a simple volt meter is fine, because the state of charge decreases pretty evenly as voltage drops.

With lithium the discharge curve is MUCH more flat. So you will maintain a very close voltage at 30% state of charge as you have at 100% SOC. Once you get near the end of the SOC however, the drop off is very quick. Because of the way they hold almost full voltage during the discharge, it’s impossible to gauge your SOC or remaining capacity on voltage alone.

The shunt meters basically count electrons flowing through them. They’ll do all the math for you, and watch the amperage that’s being discharged real-time and monitor that. Based on what you program as “full capacity” (90aH, 105aH, whatever you pack is) it does all the math for you and calculates a much more accurate state of charge.

Attached chart will illustrate a bit better as well for you
Attached Images
File Type: jpg 60748E85-0E65-4C1E-BBAA-96B084B46316.jpg (63.8 KB, 0 views)
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Old 11-11-2022, 01:05 PM   #8
jasonojordan
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Default Re: Battery Meters for Lithium... Roypow could be better :)

Thanks good to know. I am still on FLA.

Quote:
Originally Posted by CP241 View Post
Yes shunts are necessary with lifepo4 batteries.

With lead acid a simple volt meter is fine, because the state of charge decreases pretty evenly as voltage drops.

With lithium the discharge curve is MUCH more flat. So you will maintain a very close voltage at 30% state of charge as you have at 100% SOC. Once you get near the end of the SOC however, the drop off is very quick. Because of the way they hold almost full voltage during the discharge, it’s impossible to gauge your SOC or remaining capacity on voltage alone.

The shunt meters basically count electrons flowing through them. They’ll do all the math for you, and watch the amperage that’s being discharged real-time and monitor that. Based on what you program as “full capacity” (90aH, 105aH, whatever you pack is) it does all the math for you and calculates a much more accurate state of charge.

Attached chart will illustrate a bit better as well for you
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Old 11-11-2022, 03:24 PM   #9
Pat911
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Default Re: Battery Meters for Lithium... Roypow could be better :)

+1 for the Renogy 500A. It’s the only one I use and recommend.
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Old 11-14-2022, 07:23 PM   #10
WalterM6
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Default Re: Battery Meters for Lithium... Roypow could be better :)

Another vote for the Renogy. For the first time, I can feel comfortable knowing exactly how much of my battery capacity is remaining.
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