Hi
Have set up VEConfigure on a Quattro and byd
As per settings
Battery type lithium
Charge curve fixed
Absorbtion voltage 55.2
Float voltage 55v
Absorbtion time 1 hr
When charging the battery’s the inverter goes in to absorbtion but it hasn’t charged over to float?
Is there something I am missing or is these normal and should just rely on the byd bms?
Regards
Mike
Hi Mike, yes normal.
Best, Matthijs
Thanks for the reply
Sorry for the next question but just wanted to make sure things are how they should be
My understanding was if DVCC was in use on the colour control solar would be prioritised if there was a genny running and didn’t need to be as the battery’s were fully charged and the solar was enough to cover loads
Will this still work the the byd system?
Regards
Mike
Hi Mike, indeed it does.
Note that normally prioritizing isn’t too necessary for such setup; better configure the generator to stop once there is enough solar. Matthijs
Hi thanks for the reply
Can I just ask if you have some guide lines for generator stop/start soc voltage etc for the byd set up? Will be using the byd bms for the stop start on the colour gx
Is there another way your suggesting ? Ie the Quattro relay pair? And a assistant?
Regards
Mike
Hi Mike, best is to use the Color Control for start stop. It offers most flexibility.
Use the SOC condition. stop generator when full (100%); and stop when charge current very low, for example.
Make it start at the threshold as you wish. 10 or 20%. Or more of you want to keep a reserve.
Then, and this is important, add starting on voltage. This is to make sure the generator starts, even when SOC has drifted off. Voltage is a direct measurement: more reliable.
Set it slightly above advised dynamic cutoff values is what I would do.
And now, optionally, add a periodic test run.
Hope that helps
Matthijs
Writing this makes me think that it might be nice to stop the generator when the current supplied by the generator drops below a certain threshold. Rather then the total charge current, which might also come from solar. I’ll think about that a bit more later.
Thanks for the teply
I am pretty clued up on the stop start values on the previous rolls lead acod
Batterys I have running on systems but this is a new adventure with the byd units
A few figures for battery voltage would be handy as a guide?
Interesting idea with the current supply from the genny
Trust this is something technical you have to run through your head
Tegards
Mike
For the start voltage; look at our instructions wrt Dynamic cut-off; in the Victron/BYD document (it’s 47V), and then add 1 Volt. So 48V.
That’s what I would do; and then let it run and see what happens.
That’s great
Was looking at 49v so the inverter doesn’t shut down.
And then 53 v for the shut off or higher? Trying to limit the generator run time
There would need to be a series connection in the colour gx relay signal to allow to start on the colour gx and also stop in lowered generator current in put
But both relay pairs can’t contridict each other
Got my head thinking
As I am not to bad at making controls for auto start 
Hi, the voltage start&stop is a last resort. For when SOC is wrong. Yes the 53 volt is probably fine.
Any assistant in the Quattro that can be used for signal for the low generator in put current or such?
Maybe, but we can’t support you in that. Perhaps someone from the community here can (perhaps start a new question then).
Or open VEConfigure and look for it.
As said elsewhere; my comment was for future software development. Not to now complexify your setup.
That is normal.
When charging the BYD the target voltage is key, rather than the characteristic of the charging profile like in lead acid.
If the system is reaching and staying at 55V, all is well and should indicate a fully charged battery.
Ah, I didn’t see you’d also answered in the mean time.
