Anyone familiar with or have a Victron MultiPlus-II inverter

Cptnvideo wrote:
Stir, for us, microwave, res fridge, 1 A/C, etc are on Line 2. When we boondock, we have pretty much a constant 20 amp draw from the batteries. This is mainly the fridge. The fridge is frost free, so a heater likely turns on from time to time. (I haven't figured out how to turn it off.) I could assume 2 amps shore on Line 2 for the fridge when I want to power share but you know what happens when you assume.
BTW, 1 A/C is on Line 2, the other 2 are on Line 1.
Also, we are fulltimers and split our time between boondocking, friends/relatives and RV Parks.

ya I can see why you would want that haha, what kinda of solar / battery bank are you running if you are able to boondock using that much power.

Stir, for us, microwave, res fridge, 1 A/C, etc are on Line 2. When we boondock, we have pretty much a constant 20 amp draw from the batteries. This is mainly the fridge. The fridge is frost free, so a heater likely turns on from time to time. (I haven't figured out how to turn it off.) I could assume 2 amps shore on Line 2 for the fridge when I want to power share but you know what happens when you assume.
BTW, 1 A/C is on Line 2, the other 2 are on Line 1.
Also, we are fulltimers and split our time between boondocking, friends/relatives and RV Parks.

Cptnvideo wrote:
StirCrazy, first you have a 50 amp RV. Then, plugged into 15,20 or 30 amp shore power. Then your load would be a little more than shore power provides, therefore necessitating load sharing.
Since GoPower (in all their wisdom) does not monitor or take into account the current draw on Line 2, you must know the current draw on Line 2 and take that into account when setting the incoming current limit.
I have the capability to provide additional power from my solar and battery system, so why not use it. In other words, I can run 2 A/C units while on 15 amp service, but I need to know current draw on both legs and limit accordingly.

ya I got a 50 amp but the way I camp I have probabaly never used it as I am either plugged into 50 amp (only have 1 ac) or Im running of the batteries and solar so I have never been in the situation to use the load sharing part.

so I guess for me, I would only have to know the current of the leg the ac is on to do that since I only have 1? and if that so I could do that if I ever desired I guess...

Cptnvideo wrote:
From a post by TechWriter, it appears the Victron shows the combined current draw of the 2 lines. I don't know how their load sharing works which they call "load assist".

I'm no power user, so here is a source I used for Multiplus II eval & install . . .

Multiplus II Performance & Install – Power Assist explained

Multiplus II Dynamic Current Limiting

Well since my ProSine 2.0 pass-thru inverter (with ATS) is not a true ‘load sharing’ type, this is a little bit off topic, except just to say that the inverter cut-in voltage parameter is programmable but has a default setting of 108v…So this kinda brings into question, ‘on what parameters does a synchronized load sharing inverter work’??

3 tons

That's good to know, tuna.
I would be monitoring voltage and current anyway because, well, that's what I do.
My DW thinks I'm a little anal when it comes to our solar setup. :)

Cptnvideo,

On the Magnum with load support active, voltage can and does drop. Hence I monitor the voltage. It only matters for motors in items such as the air conditioner.

I do go to one location every year were the line voltage unloaded is 100 volts. If I use the autoformer, I can run the roof air. If I don't use it, then I can't.

My brother's cottage has a similar issue but not quite as bad. Unloaded voltage is about 117. Under load that drops a LOT. (I don't remember the exact numbers, but I definitely need the autoformer if I wish to run the roof air.) The shore power is a 50 amp plug, so there is no lack of amperage.

I do use the autoformer when using electric heat as output varies by the square of loaded voltage.

pianotuna wrote:
Cptnvideo,

Running two roof air units--I'd be monitoring the voltage. I start load shedding at 107 volts. (i.e. turn the air conditioner off)

Why??
In my example on 15 amps shore power, about 13 amps would come from shore and about 5 amps would come from inverter (50 ah from fully solar charged batteries during the hottest part of the afternoon).

Cptnvideo,

Running two roof air units--I'd be monitoring the voltage. I start load shedding at 107 volts. (i.e. turn the air conditioner off)

StirCrazy, first you have a 50 amp RV. Then, plugged into 15,20 or 30 amp shore power. Then your load would be a little more than shore power provides, therefore necessitating load sharing.
Since GoPower (in all their wisdom) does not monitor or take into account the current draw on Line 2, you must know the current draw on Line 2 and take that into account when setting the incoming current limit.
I have the capability to provide additional power from my solar and battery system, so why not use it. In other words, I can run 2 A/C units while on 15 amp service, but I need to know current draw on both legs and limit accordingly.