Having trouble testing maximum charge rate due to SOC & maybe MPPT configuration

[WorldwideDave]

Just let solar do it's thing and at 14V the soc should reset to 100% yes idle load is fine.

That was fast



I didn't see your reply until now.
I went outside, and with phone connected to bluetooth. Both SCC were in 'bulk' charge state.
I did turn off inverter and plug in the AC to DC charger because no sun planned for a while.
When I clicked on the bluetooth smart charge 12/25, I saw that it was in bulk. But within less than 5 seconds, it switched into absorb state.
I set alarm to check it in 3 hours.
Its been about 45 minutes and I can see it say SOC 100%.
I will go out to the charger in 3-4 hours and see if the charger is in 'storage' mode or if still in absorb mode.

I am using the li-ion charge profile on the victron 12/25 charger. All defaults. There is no 'float' - it goes to storage at 13.5 I believe.
Oh how I wish it had a VE.Can or VE.Direct port on that thing or could wire up to the victron cerbo over USB or something. having to walk to the device and connect with bluetooth not so great. I know they make bigger/better chargers, and of course the Quattro I have waiting for 48V battery will have VE.Bus on it to talk to Cerbo GX.

 

[Brucey]

That was fast

View attachment 285081

I didn't see your reply until now.
I went outside, and with phone connected to bluetooth. Both SCC were in 'bulk' charge state.
I did turn off inverter and plug in the AC to DC charger because no sun planned for a while.
When I clicked on the bluetooth smart charge 12/25, I saw that it was in bulk. But within less than 5 seconds, it switched into absorb state.
I set alarm to check it in 3 hours.
Its been about 45 minutes and I can see it say SOC 100%.
I will go out to the charger in 3-4 hours and see if the charger is in 'storage' mode or if still in absorb mode.

I am using the li-ion charge profile on the victron 12/25 charger. All defaults. There is no 'float' - it goes to storage at 13.5 I believe.
Oh how I wish it had a VE.Can or VE.Direct port on that thing or could wire up to the victron cerbo over USB or something. having to walk to the device and connect with bluetooth not so great. I know they make bigger/better chargers, and of course the Quattro I have waiting for 48V battery will have VE.Bus on it to talk to Cerbo GX.

Apparently there is a ve,direct interface inside the v2 models of the ip22 chargers can't find the thread but someone soldered a connector on the circuit board internally.

 

[WorldwideDave]

Apparently there is a ve,direct interface inside the v2 models of the ip22 chargers can't find the thread but someone soldered a connector on the circuit board internally.

Mine is the sealed IP65 (?) version I have mounted outside, where it is now raining. Thankful it is not one of the older IP22 models. Quattro will solve many of my issues.

 

[WorldwideDave]

Just let solar do it's thing and at 14V the soc should reset to 100% yes idle load is fine.

checked on it - yup, the charger says 100%, in storage mode, is putting out 1.3A, voltage is a perfect 13.5, graph says in storage mode, history shows it completed in 2 hours, charged up just 17.7 Ah, and is in maintain of 0.9A. Battery reads started at 14.14, ended at 14.20

shunt says 100%, 13.49V, 1.08A, 15W, and consumed says 0.0Ah.

In the morning, you do you want me to unplug charger, disconnect all loads physically (PV isolators off, kill the kill switch, etc.), remove the victron shunt from the bus bar (the red wire), hold it to the t-class fuse or battery positive, fire up shunt, and do that 'zero current calibration as well? I have not done that yet. Not sure it matters.

Finally, I looked at Will's victron walk through video. Was puzzled to see some settings:

What sticks out to me is the charged voltage of 13.8 (mine is at 14), peukert of 1.05 (mine at 1.0). Maybe his opinions about this have changed over the past 3 years, but seems to be different than what you and @sunshine_eggo have recommended. I'm flexible - tell me what to set it at or I can leave it.

 

[Brucey]

I would just put it back to your regular use and see how things go, you should now see a correlation between your soc and battery voltage etc.

 

[WorldwideDave]

I would just put it back to your regular use and see how things go, you should now see a correlation between your soc and battery voltage etc.

guess I'm saying I have a rare opportunity to disconnect everything tomorrow due to rain/clouds and if something recommended I'll do it.

 

[sunshine_eggo]

I did that my friend, one post up.

That may be the case, but you must have an insanely wide monitor, and I can't read any of the numbers. Can you?

This is the problem, it won't reset to 100% when it hits 14V
View attachment 284992

Change it to "Set to 100%"

Why? This should never be done. This means that if the shunt loses power, when the battery is likely depleted, it will show 100% when it's powered back up. Surely, you don't want a shunt indicating 100% when the battery is empty???

 

[WorldwideDave]

That may be the case, but you must have an insanely wide monitor, and I can't read any of the numbers. Can you?




Why? This should never be done. This means that if the shunt loses power, when the battery is likely depleted, it will show 100% when it's powered back up. Surely, you don't want a shunt indicating 100% when the battery is empty???

You are correct I have a very wide monitor.

I thought that might be what the setting is for.

I have not run any loads and it’s a perfectly sunny day. What would you like me to do.

 

[sunshine_eggo]

You are correct I have a very wide monitor.

I thought that might be what the setting is for.

I have not run any loads and it’s a perfectly sunny day. What would you like me to do.

Since I can't see the data, I can't render any advice.

 

[WorldwideDave]

Since I can't see the data, I can't render any advice.

I was referring to the BMS settings. Screenshots above.

 

[WorldwideDave]

Since I can't see the data, I can't render any advice.

Or for that matter, I believe I posted the Cell specifications above and were curious as to what I should do with the BMS settings inside the BMS itself.