# How does a bad power factor affect batteries with inverters?

Let's say I'm using a 100% efficient battery (AC battery, so there's an inverter in front of it) to power a motor with a power factor of 0.5. Let's also assume the inverter cannot correct the power factor for some reason (normally they can, right?) and is 100% efficient. Let's also assume 0 resistance in the power lines.

If I hook up the battery to a 1 HP motor with 100% efficiency, will the battery start losing more than 1 HP? I would assume not since the inverter's job is just to convert power from one form (DC) to another (AC) and it doesn't take power to have current with 0 voltage, correct (this would happen every cycle because the voltage and current wave form are out of sync due to the bad power factor)?

The only concern I have is that batteries have a limited amount of current, so if current was always being extracted from the battery (even at 0 voltage due to a bad power factor), the battery would still be losing potential power.

• The power factor will mean that the inverter would have to be rated for at least 1.5 kVA (i.e. the apparent power of the load: 1 HP / 0.5)
– τεκ
Oct 16, 2017 at 22:25
• Yeah, let's say I'm dealing with an inverter that isn't able to handle power factors other than 1 for some reason, so it's going to be affected by the motor's bad power factor (motor will need more current than it should with a good power factor). If that makes sense I mean. I know it's a weird question because normally the inverter would fix the power factor somehow (how does it do this? By shifting the current wave form or the voltage wave form)? Oct 16, 2017 at 22:37