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Customize equalisation settings for batteries
Regarding equalisation of flooded lead acid batteries, taken from Victron manual:

This setting is intended for flooded tubular plate traction or OPzS batteries. During absorption the voltage limit increases to 2,83V/cell (34V for a 24V battery) once the charge current has tapered down to less than 10% of the set maximum current. Not adjustable with DIP switches. See ’tubular plate traction battery charge curve’ in VEConfigure.


I'm wondering if there will be an issue here. To equalise our batteries (to get in the 31 - 33v range as specified by manufacturer) equalisation charging current is usually around 50 - 55A, due to the size of our battery bank (1380AH). So I'm wondering if this will allow correct EQ charging. If it tries to equalise 10% of charger capacity (70A) being 7A it won't work. Or does it refer to 10% of battery max charge current, which is much higher than the 70 amps this inverter can do. Are EQ settings customisable or am I misinterpreting it?

Note that under all other circumstances 70a for charging is more than enough, its much more than they get from the sun the other 9 months of the year.


Specs from the battery manufacturer are as follows:

Equalisation current: 3.5% of C100 AH capacity (1380AH) gives us 48.3A. That sounds about right.

Should give voltage of 2.6 - 2.75 volts per cell (31.2 - 33v), thats about right, maybe at the lower end of the spectrum.

Interval: 20 days.

Duration: 2 hours.


They really do seem to need it at least once a month during winter, even with conservative DOD. I've attached documentation should you wish to view. Also note normal recharge maximum voltage should be 2.45v per cell, I believe that means absorption should be set to 29.4 volts. That was definitely the case with the PWM charge controller we inherited with the system.


So how to get multi to equilise correctly!

upperyv asked

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Parrallel Multiplus/Grid security switch linked to master cutoff switch in Home distribution unit

Hello,


I've been scowering documentation and community's about this but could not find a scenario that fit's mine.

I'm planning on running a Multiplus or Multigrid unit in parallel with the mains, to function primarily as UPS for 1 specific load group, utilizing surplus DC from the solar inverter and AC from the mains to keep the battery's charged.

In The Netherlands, it is obligatory to have your Home distribution unit wired in such a way that the whole power system can be turned of in 1 action with 1 hand. usually, this is done by placing a master cutoff switch in the lower right corner, marked red, that turns of all power in the building in case of work, fire, or other emergencies.

I can use an auxiliary contact or magnetic contact linked to the Main cutout switch to trip the ESS Safety security switch assistant so that it shuts down the AC part of the unit.

Is this also possible using the Remote ON/OFF input on the unit itself? I rather not rely on software-based triggers in case of emergency if at all possible of course.

How have other people solved this issue? I know it is kind of contradicting wanting to run it as a UPS to make sure you have power in case of an outage, but at the same time being able to completely cut off power to all loads and disabling the Victron Multi...

Any thoughts or links to reference materials in this?

svanderlaars asked

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Multigrid II "Mains On" LED off

Good day, I have Multigrid II with Venus GX and grid meter running perfectly fine for just over a year and still running strong. This morning I have noticed that the "Mains On" LED on Multigrid panel is off while Venus GX UI shows that it is on. Because I think that it's very unlikely (although not impossible) for LED to break, I am wandering if there could be something more serious behind it.

Kind Regards

Slawek

slawek asked

0 Answers

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