Using 4 x 200Ah 12V Batteries with an 800VA Home UPS/Inverter

Can I use 4 x 200Ah 12V batteries with an 800VA home UPS/inverter?

Using 4 x 200Ah 12V Batteries with an 800VA Home UPS/Inverter

Technically, yes, you can use 4 x 200Ah 12V batteries in parallel with an 800VA home UPS/inverter, but you'll encounter challenges with recharging them. The UPS is designed to support a specific battery type and would need to be disconnected to properly charge the batteries.

Using Any Size Batteries With an Inverter

Using different-sized batteries with an inverter isn't inherently a problem as long as they meet the input voltage requirement of the inverter. Most likely, your 0.8kVA inverter is designed for a 12V DC input. In this case, you can use the batteries in parallel connection. However, if you discharge them significantly, it could be challenging for the inverter to recharge them within a limited time.

When connecting, choose the correct gauge of wires so that each battery can receive the full voltage.

Using Batteries With a UPS

Yes and no. You can attempt it, but it's important to note that sometimes the UPS will enable charging of the batteries if the required current does not exceed the maximum charging current. In most cases, it might show an error, and there's a minor risk of damaging components.

Inverters and Battery Capacity

When using 4 x 200Ah 12V batteries with an 800VA home inverter, what truly matters is the load capacity of the system and the method of charging the batteries. The inverter could handle the load of a small apartment if some household appliances, like cooking and water heating, were powered by gas.

For a larger house, it would be more limited.

Details of the Battery Bank

Assuming the inverter is 12V, 24V, or 48V, yes, the batteries should be wired correctly to give the appropriate voltage for the inverter. Since the inverter is 800W, it is almost certainly a 12V system.

A 12V 800Ah battery bank, ignoring inverter losses, offers a theoretical capacity of 9.6kWh. With a limited deep discharge (L/D), this would translate to 4.8kWh in reality, providing a run time of about 6 hours.

If the batteries were lithium cells, with a 50% Degaっちみゃ aantal, you could achieve approximately 7.68kWh, providing a better run time of about 9.5 hours. Note that you get significantly more 'run time' with the same 'label' Ah ratings using lithium-ion over lead-acid batteries.