Bernie and Carols Isuzu fit out.

[Dot]

Hey Bernie why not get a genny???

[BernieQ2]

I should also add that this was doing this two years ago at Taggerty's .
Jon may come on and maybe shed some light we did some fiddling down there .
Have a genny Dot .
Bernie .
Or 40k extension lead George .

[jon_d]

Bernie,
I reckon mine at rest are about 25.1V (12.55V)

I'll check them tomorrow morning.

[bob r]

May not be getting them to fully charged Bernie put a 240 v charger on over night turn it off in the morning leave the batteries for an hour or two
Then check them.

Bob

[BernieQ2]

That was my next move Bob thanks.
Bernie

[jon_d]

Bernie;

[BernieQ2]

Thanks Jon...doesn't tell why soc goes straight down as well.
Charger on now showing 13.5 .
Bernie.

[T1 Terry]

Are they really gel electrolyte batteries, or are they actually AGM batteries? Gel batteries are an absolute pain in the rectum to get fully charged and keep them fully charged, they do no suit long term solar only charging use as the sun doesn't shine long enough to get all the sulphur out of the plates and back into the electrolyte because the charging voltage must be held low to stop gassing which forms bubbles between the plate and gel electrolyte, this reduces the contact area which in turn reduces the storage capacity.
If they are actually AGM batteries the bulk voltage goes up to 14.8v and absorption voltage to 14.4v and should be held there for at least 4 hrs if the system is being used in cycling mode, float is only for systems that have longer charging capability like a mains charger, the sun doesn't shine long enough to actually require a reduced float voltage except out in the open in the middle of summer. The 13.6v float is for batteries remaining on a mains charger for more than 12 hrs, the other voltages are for batteries that are kept as pets

T1 Terry

[bagmaker]

Are they really gel electrolyte batteries, or are they actually AGM batteries? Gel batteries are an absolute pain in the rectum to get fully charged and keep them fully charged, they do no suit long term solar only charging use as the sun doesn't shine long enough to get all the sulphur out of the plates and back into the electrolyte because the charging voltage must be held low to stop gassing which forms bubbles between the plate and gel electrolyte, this reduces the contact area which in turn reduces the storage capacity.
If they are actually AGM batteries the bulk voltage goes up to 14.8v and absorption voltage to 14.4v and should be held there for at least 4 hrs if the system is being used in cycling mode, float is only for systems that have longer charging capability like a mains charger, the sun doesn't shine long enough to actually require a reduced float voltage except out in the open in the middle of summer. The 13.6v float is for batteries remaining on a mains charger for more than 12 hrs, the other voltages are for batteries that are kept as pets

T1 Terry

13.8??

[BernieQ2]

Terry they are agm batteries. When they get to 14.4 The solar controller goes to float, cannot hold at 14.4.. at the moment they are connected to my battery charger it's only 10amp and showing 13.3 did go to 13.8 so it's on float voltage confirmed on my multimeter . The solar panels are not connected. But the controller is connected to the batteries, it shows a soc of 56% ?? I will leave the charger on all night, tomorrow I will have access to a clamp meter. Personally I think my controller is not working .Correctly.
As a experiment I did connect the panels today and the indercated voltage was 14v and soc at 100% , when disconnected dropped back to 12.9 and soc at 53%???? We have Sun here from 7am till now it's still up.
Bernie