Victron MPPT 15/75 Controller - settings issues

[T1 Terry]

Back again,
had some pretty clouded few days so was slow testing battery some.

The solar regulator is the only charging source for the battery. Isolated the pack from any current draw also.

I have bypassed the 15 amp breaker and wiring on the charging circuit atm. Put some pretty heavy wire from regulator directly to battery terminal ( 400MM LONG) Not very much voltage drop now from reg. to battery terminals.

Disconnected the BMV 700 for the moment, removed the fuse and comms cable so it doesnt do anything hopefully and interfer.( Have changed the settings in BMV700 as reccommended above also)

Could not work out how to get into the- "find the correct path to adjust the return to boost/bulk charging mode, set it to 13.7v".

Not sure if I can get into all the settings on the regulator with just the wireless dongle / phone.
Maybe need special download software or something to do that?

Regulator now stays on bulk charge all day which is good.

Regulator Settings now-
Use default settings - off
Charger on
Absortion voltage 14.20v
Absortion time 00.50
Float Voltage 13.80v
Equalization 12.20v
Auto Equalization OFF
Temp Compensation OFF

Regulator readings today- Part cloudy
7.15am 13.25v 1.9 amps
12pm 13.40v 6 amps
2.45pm 13.46v 7.9 amps
4.30 pm 13.40v 1.9 amps

13.46v is the max reading at the regulator today. So that is getting better, I would of thought the panels/regulator would of completely charged the battery today, starting at soc 13.25v this morning.

Will see if it continues charging to full tommorrow and will see.

Aido.

13.25v gives no indication of the state of charge when it comes to lithium batteries, although 3.3v per cell would indicate the upper half of 50% SOC. With an average of 6 amps for the 5 peak sun hrs, that only adds up to 30Ah, so not a lot really, the 13.4v at the end of the day compared to 13.25v at the beginning says it is at least getting closer to the full mark.

I've been testing an MPPT 80 amp controller in an MPP inverter/charger over the last 3 days with very ordinary results. It is supposed to be able to handle up to 145vdc open circuit and operate between 20vdc and 110vdc. About the only time it got close to the same battery charging amps as the direct connection comparator panel was with only 2 panels in series, 1 panel gave the poorest output and 3 panels the output per panel was around 73% efficient compared to 83% efficiency for the 3 panels in parallel direct connected. The comparisons were even worse in overcast/raining conditions. The test panels are brand new Tinda (South Australian manufacturer) 270w panels charging a 600Ah 24v LYP lithium battery.

T1 Terry

[Busman]

Thank that is Tindo ? (Panel maker)

[T1 Terry]

Thank that is Tindo ? (Panel maker)

Yeah, Tindo not Tinda, but I got it 80% right

[Busman]

Well I think that the price is right for a wholesale buy, glad to support an Aussie company, will have a bit left over but sure to get used somewhere. (Thinking actuator controlled second story on VP)

[Enginenumber]

Ok,
done the settings posted above ,
run very heavy cable directly from regualtor directly to battery terminals as a test also.

Well, that certianly fixed it , went straight to 13.8v and switched off. Hooked up the BMV again with those settings.

Have come back in town today and will chase a midi fuse and install that also to fix the resistance issue.Someone else told me about that when I started to put it together also, but I didnt quite get it, and got all wound up at the wiring going everywhere and forgot about it.

Sounds like I was getting a bit excited with the constant voltage showing during charging for periods, due to larger battery capacity and charactoristics of the new lithium battery also.

That would have taken me months to work that out,not knowing to much about it, and all the variables, and lots of phone ,emails,I would say.

Really appreciate the help there Terry. Owe you a beer for that one!

Regards,
Aido