SBMS - Solar BMS from electrodacus

[froggy]

What sort of wattage should I expect to see from 500w solar panels.
Currently I’m seeing 313w and I would have thought it’s perfect solar conditions full sun about 28 degrees.

[BruceS]

Depends on the controller and the state of charge of the battery pack.
Sounds about right depending .........
Turn on your biggest user and see if it goes up a bit more.

[T1 Terry]

What sort of wattage should I expect to see from 500w solar panels.
Currently I’m seeing 313w and I would have thought it’s perfect solar conditions full sun about 28 degrees.

500w x 70% = 350w. We often see more like 80% or even 90% when charging lithium batteries via the Dingo and solid state relay method, so .......

T1 Terry

[T1 Terry]

I still haven't read the manual, slack of me I know, but you only read the instructions when all else has failed and that hasn't happened yet [emoji1]
What settings have you used for the bulk charge voltage, absorption stage voltage and time and the float voltage? The high cell cut off should only ever be a secondary level protection required if the cell balance is excessive at the top end of the bulk charging cycle

T1 Terry

I may be looking in the wrong spot but i cant see settings to do with this, its not a conventional charger? I just assume it charges whatever the solar give it. I was of the understanding that it just cuts out when a cell gets to the set hvc.
Actually going back through the manual there was an end of charge setting, think ive got that at 3.60 and hvc as 3.62
Here is the standard settings screen

Hmmmm..... time I extracted the digit and set up a test pack by the look of it. Not keen on the all eggs in one basket" approach because electronics are so unpredictable and I'm never keen on trusting a single microprocessor not to stuff up, even the very best of them use the 3 in parallel method during normal operating conditions. I use 3 microprocessors with 5 levels of redundancy protection, the last line of defence is battery isolation.

T1 Terry

[froggy]

Any news on testing these units Terry?

[T1 Terry]

A few things I have found:
when they are put in their boxes they stay there until someone takes them out
Never leave an unmarked box on your bench, it will get put away but no one knows where cause it didn't say what it was, so it was just put away ......
The real issue has revolved around lack of time to do work at the house such as installing the solar and batteries, so without a test bed there wasn't going to be a lot of testing

[T1 Terry]

Well, after installing this thing and multiple complete disconnects to change to the new parameters, this thing is determined to send me crazy There is something within the programing that is outside the area of fine tuning that makes the unit decide a cell is either not being monitored or has failed. It then disconnects the charging with absolutely no warning, yet does not have the capacity to disconnect the battery from the inverter. The result is a cell getting deeply discharged that wouldn't have happened normally.
The only way to get it back on track is to completely disconnect the thing, charge the battery via a different method and then reconnect it. Only then does it return to normal operation. The cell balancing is more of a display gimmick by the look of it than a real balancer, otherwise it wouldn't allow one cell to go low according to its display and then lock out the charging. The Junsi cell loggers connected in parallel do not show the same crazy high and low cell voltages the Electrodacus does, so until it decides not to recharge the battery, there really isn't a problem, it actually creates a problem.
Not happy Jane, I will work on the thing more once we get back home, I'm sure there must be a way around it, but a real pain the way it comes configured.

T1 Terry

[Eddy]

Hi Terry
You are probably dabbling in areas I have not delved into or would dream of with my little four cell 160ah setup
When I have measured individual cell voltages (just with an el cheapo multimeter) always matches with what electrodacus is showing - is the monitoring cable colours going to the right cells
I have not tried it but isn't EXTIO3 suppose to turn the inverter remote on/off
Have you tried an email to Dacian electrodacus@gmail.com
Eddy

[T1 Terry]

Hi Eddy, we aren't that far away from you at moment, in Brunswick. I have double checked every connection, tried with the Junsi loggers disconnected, tried leaving it disconnected for a few hrs, for the whole day, resetting factory default, you name it I've tried it. the cells not reading correctly are cells 1&2 and 7&8, the rest read correctly. I decided to try bypassing the Electrodacus over night to see if I was blaming it for an actual battery problem. This confirmed the Electrodacus was actually creating the problem, it now seems to be permanently stuck on a failed cell shut down of the charging and load so now the whole thing is bypassed. All the solar and load connections are joined in one big BP cable connector and the cell over voltage is controlled by either turning the hot water and the air con on at the same time, or turning part/all of the solar off when there wasn't any more water heating to be done and the bedroom area was down to 21*C and getting too cold for comfort
I'll contact them when we get back home, nothing much I can do with it at the moment so no point in getting further instructions.

T1 Terry

[dapope]

Could it be faulty?