I have a Axpert VM II 3kw Hybrid solar inverter with 2200 KW of solar panels and 2x 115AH deep cycle flooded lead acid batteries. The inverter is in SOL mode and charging priority is set to OSO (only solar) so what have I observed is that the batteries will reach floating voltage 27.0 volts during day and then when the sun goes down the voltage also goes down to 25.7 -26.0 volts and charging light blinks, when there is no solar i.e no sun the voltage goes to 25.2 (100% SOC) and then continue to decrease, 24.7 volts after a couple hours and when I wake up at morning it shows 24.2 volts (50 %)
the load is powered the whole night by utility, and the load is literally a router and a 10 watt led bulb.
I know that voltage is not good way to tell SOC
when I woke up this morning, I disconnected grid and solar , put load on the batteries and voltage drop to 23.9 volts which is normal under load.
and you may say that solar is not enough. so the sky remains clear, there is very less load during the day about 100 watts( no one is at home) and batteries reach floating voltage and not just instantly or in couple minutes or hours. it takes full time to get to float that I think is about 8 hours. I calculated charging time and it is 8 hours from 50% soc to 100%
And the charging current is 10 amps
could that be because of the cables I used to connect battery to inverter. I took 8 AWG and 12 AWG and twisted them at both ends and connected the batteries with them
and the 8 AWG says 220/440 volts on it(its a cheap one).
every thing is new especially the batteries only 2 days since installed.
the load is powered the whole night by utility, and the load is literally a router and a 10 watt led bulb.
I know that voltage is not good way to tell SOC
when I woke up this morning, I disconnected grid and solar , put load on the batteries and voltage drop to 23.9 volts which is normal under load.
and you may say that solar is not enough. so the sky remains clear, there is very less load during the day about 100 watts( no one is at home) and batteries reach floating voltage and not just instantly or in couple minutes or hours. it takes full time to get to float that I think is about 8 hours. I calculated charging time and it is 8 hours from 50% soc to 100%
And the charging current is 10 amps
could that be because of the cables I used to connect battery to inverter. I took 8 AWG and 12 AWG and twisted them at both ends and connected the batteries with them
and the 8 AWG says 220/440 volts on it(its a cheap one).
every thing is new especially the batteries only 2 days since installed.