This site is now in read-only archive mode. Please move all discussion, and create a new account at the new Victron Community site.
Hi Guys
I've been having dramas in regard to 5x MPPT's charging in the morning fine but once battery is full (BYD Lithium's) they wont come back and charge when battery percentage drops and load increases? Usually one out of 5X will charge but the rest sit at small Wattages (5w 8w etc.?)
These are coupled to a CCGX and utilise a USB hub.(Industrial)
Any help would be appreciated as I have tried all sorts of fix's?
Regards Tim
@samin8r, Just to clarify the situation as I am also interested in the answer to your question.
Are you saying?
When the load increases it is being supplied jointly by the battery and a single MPPT and not by the available PV power through other available MPPTs when this happens?
Is it ok if I look at the system on VRM?
Tim are all the MPPT units set to lithium battery type,
whats the open circuit PV voltage and
what is the model of the Solar regulator
are they all on the same version of firmware (maybe check each one using a victron bluetooth dongle and the victron connect app, when the mobile phone is connected to the internet)
Yes all MPPT's are set to the same numerical setting for the battery type.
The model of the Regulator is the 150/70.
All units have been updated to the latest firmware.
Running a CCGX and VRM. Open circuit voltage is 110vdc
The usb hub is worth a harder look at if you haven't already. It should be externally powered, is it getting power, etc.
'Weakness' here could explain your symptoms. Have you another you could try?
yes I have swapped different brands used cheaper ones had the same issue.
The one Im using is more reliable than the others and it is powered 12-48vdc in.
Have some serious ventilation on all components as it has been quite hot here (46C) max mostly early to low to mid 40s.
I do plan to put a RC A/C to cool and regulate all components. in future.Could this be it really?
I don't know. You could be living right next door to me with those temps, and I've always found Victron kit to be more immune to them than I am. :)
Tis the 'multiples' I'm suspicious of. Maybe you could try going straight to the CCGX with as many as you can fit, like 2x usb and even1x VE.direct? Just to see..
Like, try to find a 'pattern' which might help nail it down.
The most I could fit directly is 2X USB's and possible one VE Direct to the CCGX.
The issue is all the MPPT's will work when charging the battery but once the battery is full it then drops two to three MPPT's off no matter what the AC load is?
That picture shows a full battery that is not discharging. So there is nowhere for the additional MPPT solar to go?
The other MPPT’s likely won’t pick up again until the battery voltage drops.
Ok, leaving aside the hub issue. Given your mppt's aren't synchronised, they'll produce to a V target independently. Call it 'manufacturing tolerance', but in practice some will reach it and wind back earlier than others.
Your screenshots are actually quite useful, and 'ccgx2' shows 2x 'wound back' at an up-there 55.82V. I'd actually expect that to happen. And it won't hurt anything, if that's what you want for your batts.
If they didn't wind back up when the V dropped, then you would have a problem. The mppts will only see V, not SOC or anything else.
Note I'm assuming a simple system, and if you're using firmware addons, then say so and the experts can wade in.
