Is it possible to terminate the Absoption period using a tail current threshold. I.e 1% of 20h C rating and if so, how? I have a Colour GX, BMV and Quattro. I’m off grid and use solar to charge the batteries (FLA). If I bought a smart MPPT charge controller, would that help?
Thanks in advance for any advice.
Hi @kev
I don't know of any means of doing that with the Quattro's charger, but it's certainly possible with either a Smartsolar or Bluesolar mppt.
If you invoke DVCC in the CCGX, the mppt will use the current from the BMV as a source for the mppt's Tail to work from. (ie your '1%'). That way all dc or ac loads are eliminated from consideration, so it's just dealing with the battery charge. As it should.
If you already have a Bluesolar, VictronConnect can access it's settings via the CCGX ethernet or an added wifi dongle.
I find a 2% Tail suited to my own fla's, and by then SOC is ~99% anyway. With my batts always under some load at sunup, the mppt Adaptive algorithm gets a little 'lost', and may decide on too long an Absorb time.
I highly recommend, but come back if you need more detail.
And oh, the mppt Rebulk function is now a pleasure to watch it doing it's thing... Victron magic..
Hi John,
thanks for the response, it was what I was hoping for. I’ve looked at the DVCC documentation but didn’t see anything about this. I shall look at getting a Victron smart solar charger.
kev.
correction!. Just read about tail current in the SCS section.
@kev Yeh, Victron technical documentation isn't like sales brochures, and DVCC is 'just' a bit of code, a side-benefit that doesn't make headlines, but rises when you need it. It's good stuff..
A little unlike bluetooth (the 'Smart' kit), which makes the brochures, but I can't use with a GX doing the equivalent.
It's about choice, and the end result you want.
