I'd appreciate if someone can advise and give me an idea about the condition of my battery and my overall set-up.
I set-up off grid solar system about 2 years ago, for my parents in my hometown
Below are the following specs
- Battery 12V- 180Ah (Sacred Sun Brand)
- Solar Panel - 200W ( but was only producing 60W max ever since)
- Pure Sine Wave Inverter - 800W (Seldom use)
- PWM Charge Controller - 30Amps
I haven't checked this set-up for about 2 years. and just checked it now.
Right now, everything seems to be working perfectly fine since I left except the battery.
My battery seems to be staying at 10.5V when on standby mode. Weird thing is, when I hook my inverter, it is still producing power at around 50W-65W or maybe up to 80W (laptop connected) for around 4-6 hours, and the inverter won't beep for low input voltage. The inverter would previously sets of the alarm when the battery voltage reaches down to 11.5, but now, the inverter will only sets off the alarm if the battery voltage is below 10V (somewhere around 9.9V or 9.8V).
I find it really weird for both my battery and inverter to work like this.
I am also pretty sure the the voltage readings are correct, I use 3 different voltage tester to test the battery voltage.
This is what I notice on my battery.
If there's about 60W from solar panel, battery charge voltage starts at around 10.8V and would climb up to 11.5V or 11.6V
I never notice the battery charges from 11.9V - 12.9V
After few hours with only 30W-60W average charge, the battery voltage reaches around 13.5V up to 15V, and my PWM controller would indicate that the battery is fully charge.
After sun sets. battery voltage would drop back to around 10.5V
During load ( 40W ) battery voltage would drop to around 0.1V or 0.2V Voltage, until it reaches, 9.9V and inverter will sets of the alarm.
Can anybody advise the state of my battery, I'm also curious why my Inverter isn't beeping even when the input voltage is low.
Appreciate any help.