Epever MPPT 3210AN 30 Amp calibration question. reading different that its sister,

[kanelr]

Hi Just added a second Epever for a different group of panels. Running two Epever units, one a seven month old 40 amp unit, and one a week old, 30 amp. They both connect to the same battery buss with the same length of wire (3' of #6), however the newer one reads battery voltage about a tenth of a volt lower.....any ideas?

 

[Browneye]

They'll display higher voltage of they're charging, lower if they're not, and lower if there's current draw. Any charging on the bus will show a higher voltage.
Any charge controller is not a good gauge of SOC nor battery voltage. If you have a BT app for your BMS you'll likely get more accurate readings. But the true value is when the battery is at rest - no charge or discharge current.

 

[kanelr]

They'll display higher voltage of they're charging, lower if they're not, and lower if there's current draw. Any charging on the bus will show a higher voltage.
Any charge controller is not a good gauge of SOC nor battery voltage. If you have a BT app for your BMS you'll likely get more accurate readings. But the true value is when the battery is at rest - no charge or discharge current.

well for example, at one point my inverter, The EpEver 40A, and my battery monitor all read 26.6v when the new EpEver 30 read only 26.5 in dark of night, all connected the same. Would think there would be the same readout from at least the two which are the same brand, but no

 

[Symbioquine]

Hi Just added a second Epever for a different group of panels. Running two Epever units, one a seven month old 40 amp unit, and one a week old, 30 amp. They both connect to the same battery buss with the same length of wire (3' of #6), however the newer one reads battery voltage about a tenth of a volt lower.....any ideas?

• Check your connections
  • tarnish on the bus bar
  • loose bolts
  • bad crimps
  • etc
• Only expect the voltage to match when neither SCC is charging - differences in charging current will affect the unit's perceived bus voltage
  • The larger Epever tracer 50A+ units have a separate voltage sense input to address this, but the smaller ones don't
• They might just not match - different manufacturing batches, defect, etc

 

[clskinsfan]

Dont want to hijack your thread but how did you get the software to work. I downloaded the Solar station Monitor from the Epever site and have been trying for days to get it to connect to my laptop. It is frustrating as all get out.

 

[Bud Martin]

well for example, at one point my inverter, The EpEver 40A, and my battery monitor all read 26.6v when the new EpEver 30 read only 26.5 in dark of night, all connected the same. Would think there would be the same readout from at least the two which are the same brand, but no

That is only about 1% off, the Volt meter circuit will have accuracy spec which Epever and other Solar charge controller do not supply.

Digital Multimeter: What is the accuracy, range and resolution? | Fluke

Using a multimeter that provides the right measurements is important. Knowing what those measurements mean is even more important. Accuracy and precision ensures the measurements you take will be useful; higher precision enables easier repeatability and higher accuracy means the your readings will b

www.fluke.com

 

[Checkthisout]

Dont want to hijack your thread but how did you get the software to work. I downloaded the Solar station Monitor from the Epever site and have been trying for days to get it to connect to my laptop. It is frustrating as all get out.

How did you connect it to your computer? You have to have the RJ45 to USB adapter from Epever.

And, you have to deprecate the USB driver in your computer in order for it to work.

 

[clskinsfan]

How did you connect it to your computer? You have to have the RJ45 to USB adapter from Epever.

And, you have to deprecate the USB driver in your computer in order for it to work.

Yes. I have the RJ45. And downloaded the driver after the software. Cant figure it out. Ill keep working at it in my spare time.

 

[Checkthisout]

Yes. I have the RJ45. And downloaded the driver after the software. Cant figure it out. Ill keep working at it in my spare time.

You have it connected to the USB port on your computer?

Are you able to open the program?

Start a different thread.

 

[Browneye]

Dont want to hijack your thread but how did you get the software to work. I downloaded the Solar station Monitor from the Epever site and have been trying for days to get it to connect to my laptop. It is frustrating as all get out.

Thread jack...
Do a search here or on google for the site - several good threads on how to configure and get it working.
You do need the proprietary cable, and you need to configure the port for RS485 or it won't connect.

 

[Checkthisout]

Yes. I have the RJ45. And downloaded the driver after the software. Cant figure it out. Ill keep working at it in my spare time.

 

[kanelr]

That is only about 1% off, the Volt meter circuit will have accuracy spec which Epever and other Solar charge controller do not supply.

Digital Multimeter: What is the accuracy, range and resolution? | Fluke

Using a multimeter that provides the right measurements is important. Knowing what those measurements mean is even more important. Accuracy and precision ensures the measurements you take will be useful; higher precision enables easier repeatability and higher accuracy means the your readings will b

www.fluke.com

of course. my concern is that two pieces which should read the same don't. the only thing not checked is if the breakers between the controllers have different resistance- which I will check with my digital meter.

 

[kanelr]

Yes. I have the RJ45. And downloaded the driver after the software. Cant figure it out. Ill keep working at it in my spare time.

I tried the computer cable as well (created 2 threads here I think in the process) it didn't work. I found the black add on box MT50 thingie for less than 20USD on amazon it works well. I think they are a little more usually. It is a nice add on, and in the time I wasted trying to get their software to work I could have earned enough to buy three of the things.

 

[Leeds]

There are a lot of tradeoffs in designing I/O on circuit boards. The most accurate ones my company has made were 24 bit a/d converters with 1% resistors and even with them we had to calibrate each board on a bed of nails before assembling them. In our case the I/O was flexible so we had 2 calibration points for them in voltage mode, 2 more for current mode and 2 more for resistance mode. With those controllers you could rely on all of them reading identically.

While I love epever, (I have used a few of them now) they are not sold at a price point that suggests they are designed to be that accurate. A tenth of a volt could easily be within spec for their design.

If the tenth of a volt bothers you I'd suggest just working around it. Set that panel with "user" settings and set all of the values a tenth of a volt lower than the other panel(s).

 

[kanelr]

There are a lot of tradeoffs in designing I/O on circuit boards. The most accurate ones my company has made were 24 bit a/d converters with 1% resistors and even with them we had to calibrate each board on a bed of nails before assembling them. In our case the I/O was flexible so we had 2 calibration points for them in voltage mode, 2 more for current mode and 2 more for resistance mode. With those controllers you could rely on all of them reading identically.

While I love epever, (I have used a few of them now) they are not sold at a price point that suggests they are designed to be that accurate. A tenth of a volt could easily be within spec for their design.

If the tenth of a volt bothers you I'd suggest just working around it. Set that panel with "user" settings and set all of the values a tenth of a volt lower than the other panel(s).

makes sense. based upon viewing longer i would say they are less than a tenth apart. I will live with it. Thanks