question

you cant do this because of voltage bounce it goes low on load that once the load is remoived the voltage bounces back up.

maybe use a BMV-712 and us the relay on that to open the remote switch.

or setup a assiatant in the multiplus to turn of when SOC gets to a nominated figure

you would have to turn on the internal battery monitor and this only really works if you don't have and other DC draws off the batteries.

here is a link to some assistant setup options

https://www.victronenergy.com/live/assistants:introduction

https://community.victronenergy.com/questions/8933/example-of-using-assistants-partial-off-grid-boat.html

the above maybe of help

Hi T. This issue seems to also be of concern to the Li people particularly. Maybe we can expect future improvements? Anyhows, some thoughts..

@ 24V, you have a min 2V to play with between min & restart. So do your best to find the right range.

I note you switch off the inverter. Fair enough to dodge the standby load. But when you switch it back on it will want to 'preload' it's caps, etc. So expect a downward spike on batt V when that happens. It can be fast, like a spark, but may influence what you see. (There's a clumsy way to workaround that, just ask if it's an issue).

Any sort of charge at all will soon lift batt very quickly if it's mostly charged, even a single panel.

If you're 'headin bush' though. maybe consider easing your settings before you leave. Given you may need ac to do that, hey.

Right, set back to default settings and will purchase a ‘battery protect’. Not happy that I have wasted $100 on the overpriced USB cable to use a setting that is essentially defective.

Now I have to spend another $70 on a product to do something I should already be able to do. Not impressed really, won’t be recommending the multiplus to others.

Feels like an apple product, buy the bare bones and then buy all the extras to keep the revenue coming in.

There’s no reason why I should not be able to have the unit cut out when the batteries reach 40% and then be able to either automatically restart or manually override when the batteries exceed my desired voltage, without the need to screw the front off and connect my computer to it.

I can sympathize with you getting 'excited' about this. Please try to understand it's the very nature of Pb batts that causes the issue and can easily show a 2V variation depending on load when the batts are not under charge. It's not an issue confined to Victron kit either.

I considered suggesting a BatteryProtect, but I didn't think it would help you muchly. You don't want to spend more, and I appreciate that too. An open budget would suggest a BMV, GX box, www, portal access, and email warnings. Nice, but I'm not suggesting that either.

In the washup, bigger batts may be the only real 'cure' for this.

But for now, you have kit that can at least be adjusted, and there will be an optimum point that may come close to suiting you. Have a go trying to find it.. good luck too.

I have a similar issue and live on a sail boat. Victron 24v/2 x 200 AH LIPO connected to a 24/5000 MultiPlus (+ Battery Protect x2, Venus etc.). The 'DC minimum restart' value is the issue. Updated to lastest VE.configure (90.04.220) running through CrossOver on a MACBOOK Pro via Victron Remote so do not need to unscrew the front panel. There is 'plenty' of energy left in the LiPO bank at 26.35V which is the 'minimum' value able to be set in VE Configure. Why? I understand that it should not be 'easy' to simply put in any value but as I understand it from Victron own doco/info the damage to this battery does not occur until cell voltage at 2.8 (22.4 V) and I am happy to run regularly down to 3.16 (25.3V) so why cannot the DC restart be say... 3.16v/cell (25.32 V). This information is available from the battery (Smart) or total from Lynx or Venus on my system. The MultiPlus appears to need to get into bed with the rest of the smart sibling devices and operate as part of the Victron team. It should be a simple enough matter to change the minimum value to '<read XX> from your minimum pre-alarm value set on the same VE.Configure page.