Hi,
confusion about settings 13

settings 1 SBU
Back to battery mode at 13.5v means battery is fully charged ?
if not means battery always remain under charge?

Thanks 

6 minutes ago, Chunu said:

Hi,
confusion about settings 13

settings 1 SBU
Back to battery mode at 13.5v means battery is fully charged ?
if not means battery always remain under charge?

Thanks 

No it is just to go back to discharging a battery but not to stop charging. It will stop charging 1st at the bulk setting and then a bit lower at float. I would use float at 13.8V

Thanks Scorp007 my current float charging is 13.5v and bulk is 14.6 as per battery data sheet. There will be no harm if set float  to 13.8v?

40 minutes ago, Chunu said:

Thanks Scorp007 my current float charging is 13.5v and bulk is 14.6 as per battery data sheet. There will be no harm if set float  to 13.8v?

The back to battery is a different setting to bulk and float. Normally back to battery must be at least 2V above cut off. Rather stick to the float and bulk from the manufacturer. We only give some guidance without having the exact details like you already have.

4 hours ago, Chunu said:

if not means battery always remain under charge?

Setting 13 will only come into play once the voltage for setting 12 has been reached. It is the voltage at which you want to allow the battery to be used again. So once you reach setting 12 the inverter will switch to utility and charge the battery until you reach setting 13 and then it will use the battery again.

4 hours ago, Chunu said:

Back to battery mode at 13.5v means battery is fully charged ?

Not quite yet if you are coming out of setting 12 and charging up, it would need to reach 14.6V and stay there for a little while (depending on your Ah and charging amps) before it is fully charged i.e. complete a full charge cycle, but 13.5V is fine for this setting if it is not happening all the time as the battery will likely get a chance to fully charge once there is PV again. 

Thanks Scorp007 & jumper for detailed explain.

16 hours ago, Scorp007 said:

Normally back to battery must be at least 2V above cut off.

That's for 48 V models. Half that for 24 V, and quarter that for 12 V. So at least 05 V here.

Even when the inverter goes to float stage (charge LED on solid), there is a light charge current (if there is enough PV) to keep the battery very nearly fully charged. Only when the charge LED goes out is there no charging at all. When flashing, that LED indicates that it is bulk or absorb charging.

Hi,

We have cloudy weather these days not enough PV to charge battery as well as load shedding so  SBU mode will drain the battery. what combination you suggest SOL & CSO or SOL & SNU for cloudy weather.

Current settings 

settings 1    SBU
settings 12    12.5v
settings 13    full
settings 16    SNU
settings 29    11.90v

Thanks 

Edited August 3, 20223 yr by Chunu

50 minutes ago, Chunu said:

Hi,

We have cloudy weather these days not enough PV to charge battery as well as load shedding so  SBU mode will drain the battery. what combination you suggest SOL & CSO or SOL & SNU for cloudy weather.

Current settings 

settings 1    SBU
settings 12    12.5v
settings 13    full
settings 16    SNU
settings 29    11.90v

Thanks 

No bad sun and LS as now calls for not trying to save grid power. With grid available much longer than even when we have sun:

1 Util.  12 and 13 does not apply when grid is on. Use what is practical based on battery size and load during LS. 16 is fine as SNU. 29 is also fine.

Thanks Scorp007 

One more question, 

when pv is less just enough to carry load but not enough to carry load and charge battery simultaneously in that case what should be the priority SBU or SOL.

18 hours ago, Chunu said:

Thanks Scorp007 

One more question, 

when pv is less just enough to carry load but not enough to carry load and charge battery simultaneously in that case what should be the priority SBU or SOL.

I cannot think of using either at times of LS that you need the battery. You run the risk that battery power will be used if a cloud comes over with both of them. This is the reason I suggested to use UTIL to now try and save on grid power during LS like we are having now.

SOL as priority can drive the loads and UTIL will provide power after sunset.