Victron charge rate when there is a load on the system.

Simple as I can make it.

Bunch of new panels going online soon……and I don’t want to change my batteries at a rate over about 25- 30% ,.
Yet will be enough panels to exceed that by a large margin in summer.

So , does having a load on the batts negate that load portion of the PV power from ever charging the batts ..

It’s my understanding that the power doesn’t really go into the battery and come back out but simultaneously is sent to the load AND the battery and sorta split to each need.

Using this as example… let’s just say the PV is producing 5000 steady watts to the batts ( 24v) with no load.. and the batts SOC is low enough to accept the 5000 watts …
But I don’t want to go over 3000 watts to charge with ….jus sayin…

If I turn on loads on that draw let’s say 2000 watts , then of the 5000watts ,about 3000 go to charging and 2000 go to the load at that time.. basically at the batt terminals.

That seems to be what i e been told and what the 712 shunt page reflects while charging and the RV is drawing power at the same time ..you can see the PV power generated at the SCC page is reduced from going to charging by the amount of the load that is running as seen on the shunt menu page .

Thanks J.

JRH said:

So , does having a load on the batts negate that load portion of the PV power from ever charging the batts ..

It’s my understanding that the power doesn’t really go into the battery and come back out but simultaneously is sent to the load AND the battery and sorta split to each need.

Click to expand...

Pretty much nailed it.

The load creates a voltage drop. Power will flow towards the lowest voltage, whatever is left over will go to the battery. It pretty much just goes where it's needed.

I like to think of it like water flowing out of interconnected buckets, water flows from the high bucket to the low bucket via a tube

My Victron MPPT has a setting that lets you throttle the battery charge to whatever you want.

Just set the amps to 25% and done. You can also run loads at the same time if you want. E.g. air con.

Bluedog225 said:

My Victron MPPT has a setting that lets you throttle the battery charge to whatever you want.

Just set the amps to 25% and done. You can also run loads at the same time if you want. E.g. air con.

View attachment 218320View attachment 218320

Click to expand...

Ya know…
I plum forgot about that feature ….damn.. but since there soon will be 4 arrays and 4 victron CC operating at the same time I will have to ponder the wherefore and why of how to make that work as simply as having one CC…or if ya can…
But thanks for reminding me…
J.

pollenface said:

Pretty much nailed it.

The load creates a voltage drop. Power will flow towards the lowest voltage, whatever is left over will go to the battery. It pretty much just goes where it's needed.

I like to think of it like water flowing out of interconnected buckets, water flows from the high bucket to the low bucket via a tube

Click to expand...

Thank you… good analogy… ironically water always seems to come in handy when figuring out how electricity will behave… or not behave…or maybe just kill ya..

JRH said:

Ya know…
I plum forgot about that feature ….damn.. but since there soon will be 4 arrays and 4 victron CC operating at the same time I will have to ponder the wherefore and why of how to make that work as simply as having one CC…or if ya can…
But thanks for reminding me…
J.

Click to expand...

To do what you need you'll need a Cerbo or other device running Venus os. You can then enable DVCC and specify that you only want for example 55A charge current. The Cerbo will then coordinate the SCCs to take load into account, and not exceed 55A charge to the batteries.

Brucey said:

To do what you need you'll need a Cerbo or other device running Venus os. You can then enable DVCC and specify that you only want for example 55A charge current. The Cerbo will then coordinate the SCCs to take load into account, and not exceed 55A charge to the batteries.

Click to expand...

Well I do have planned disconnects for each array if I need to cut off a couple , but will have to wade deeper once it’s running … may can aim arrays differently so as to lower full output at one time of day or stagger it to a lessor output for longer period…

The reason for all the panels is to build up for winter production , I only need a small amount more than I have now in the summer, but last winter showed me what and how many and where I need to have all I can get…only 3 months ,…but that’s a long 3 months …

I may just end up turning off half of the arrays in summer on sunny days…..I don’t have a big place or need…but in winter , trees shadows , snow and low sun is the enemy im preparing for…

I’m still building it as I learn to fly it…ha.

J.