Dear all,
I am trying to work out a small Solar backup unit. I got the solar part right,I can now charge 2x12v 150AH tall tubular batteries at about 10~11A (In Series) Using a state of the art MPPT solar charge controllers. Now what remains is the UPS/Inverter part. Please provide guidance on the following questions-
1> I have 2 UPS options to use. Both are rated at 800VA. Made by Same manufacturer- Microtek (reputed manufacturer in our area). The Only difference is , One unit runs on 24v (2 batteries in series) and other is 12v Unit.
Surprisingly, the 12v unit is beefier & heavier. Does it mean that 24v units can use smaller transformer for the similar VA ratings? What is the underlying reason. I have modified Both units with fans for added cooling.
2> For this application, I am leaning towards the 24v Unit. As Charging batteries with 24v config appears more efficient. Is that correct?
I have connected the 24v 800va UPS for the moment.
3> There is a slight shock/ Stray current at battery terminals when UPS is ON. Is this normal?
The shocking is not present in 12v Unit.
4> The Lights connected to 24v UPS (On battery mode) Flicker a bit when there is hardly any other load on the UPS. I am using Seoul LED modules with appropriate Drivers & Heatsinks. The Flickering Vanishes when some additional load (Eg a Fan) is started on UPS. What is causing this behavior?
I am trying to work out a small Solar backup unit. I got the solar part right,I can now charge 2x12v 150AH tall tubular batteries at about 10~11A (In Series) Using a state of the art MPPT solar charge controllers. Now what remains is the UPS/Inverter part. Please provide guidance on the following questions-
1> I have 2 UPS options to use. Both are rated at 800VA. Made by Same manufacturer- Microtek (reputed manufacturer in our area). The Only difference is , One unit runs on 24v (2 batteries in series) and other is 12v Unit.
Surprisingly, the 12v unit is beefier & heavier. Does it mean that 24v units can use smaller transformer for the similar VA ratings? What is the underlying reason. I have modified Both units with fans for added cooling.
2> For this application, I am leaning towards the 24v Unit. As Charging batteries with 24v config appears more efficient. Is that correct?
I have connected the 24v 800va UPS for the moment.
3> There is a slight shock/ Stray current at battery terminals when UPS is ON. Is this normal?
The shocking is not present in 12v Unit.
4> The Lights connected to 24v UPS (On battery mode) Flicker a bit when there is hardly any other load on the UPS. I am using Seoul LED modules with appropriate Drivers & Heatsinks. The Flickering Vanishes when some additional load (Eg a Fan) is started on UPS. What is causing this behavior?