Vigilant24
New Member
- Joined
- Aug 23, 2022
- Messages
- 119
I'm planning to buy two 12V inverters: a small one (about 500W) and a bigger one (about 2000 watts). I want to protect my 2 x 105AH FLA batteries, but have been surprised to see that the low voltage cutoffs on inverters tends to be at about 9-10 VDC (often with an alarm starting at about 0.5 V above that).
Now, if I understand things right, an "at rest" nominal 12V battery will show an open circuit voltage of about 12.7V when full, about 12.10 when discharged to 50%, and about 11.5V when it has just 10% remaining. At 10 V, it would be long gone, or at least damaged.
Why do these inverters allow the battery to discharge to 10V (or lower)? Is it due to some difference between "resting" voltage and in-use voltages?
Is there a general consensus about what the inverter cutoff should be in order to protect a FLA battery?
Is there an (affordable?) 500w inverter that has an adjustable low voltage cutoff?
I looked into buying a separate low-voltage cutoff circuit board (cheap insurance at about $15), but most max out at about 10 amps which doesn't provide much wattage at just 12V.
Thanks for any assistance.
Mark
Now, if I understand things right, an "at rest" nominal 12V battery will show an open circuit voltage of about 12.7V when full, about 12.10 when discharged to 50%, and about 11.5V when it has just 10% remaining. At 10 V, it would be long gone, or at least damaged.
Why do these inverters allow the battery to discharge to 10V (or lower)? Is it due to some difference between "resting" voltage and in-use voltages?
Is there a general consensus about what the inverter cutoff should be in order to protect a FLA battery?
Is there an (affordable?) 500w inverter that has an adjustable low voltage cutoff?
I looked into buying a separate low-voltage cutoff circuit board (cheap insurance at about $15), but most max out at about 10 amps which doesn't provide much wattage at just 12V.
Thanks for any assistance.
Mark