12v=120AC Inverters that can handle low voltage ?

[Crusader]

12v/120AC Inverters that can handle low voltage with deep cycle batteries...?

I just bought a Marine deep cycle Optima blue battery D34M to use with my 2 inverters. Both have low voltage shut down around 10.5 - 10.9 volts. Inverter #1 is an older TripLite 500 watt and the other is a Costco 400 watt with a fairly handy dc voltage input toggle/wattage/receptacle voltage display. It start chirping when input voltage drifts down to even 11.3 volts.

I'm running these set up at probably 500 to 700 watts combined output. I was expecting the battery to hold out longer than 40 minutes before I get low voltage?

Maybe I'm expecting too much but I'm thinking these inverters are geared more towards standard automotive batteries which don't like to be discharged below 11 volts.

Is there an inverter that will up regulate specifically for use with deep cycle or is a voltage drop down to 11 volts already a huge amount of discharged capacity?

Any help much appreciated

 

[SecondMonkey]

Below 11 volts your battery is dead.

 

[JHZR2]

58A is pretty high sustained use for a lead acid battery IMO.

At full discharge, load can take you to ~10.5V, and you can possibly go a bit lower (1.67V/cell, IIRC).

But you are pulling a lot of current, and the battery may become polarized at that point, requiring a rest.

Is wiring for the inverter perhaps a weakest link for going lower?

 

[Crusader]

I'm currently using battery post clamps. I was thinking of using a more secure solid connection but I seriously wondering if this will work out for the load I'm putting on it? Here are the spec for the unit. http://www.optimabatteries.com/_media/documents/specs/D34M.pdf

Long story short I'm running all this to charge a bunch of Dewalt 18 volt chargers. Basically output to 7 charging stations. 2 dual port chargers [4 charging bays] are run by the Triplite 500 and the 400 watt unit is running only 3 charging bays. Prior to this I was running a Honda EU2k generator to run all this and it barely pulled off idle on ECO mode.

 

[JHZR2]

could you parallel your batteries to make the current draw lower, and perhaps more benign?

Havent thought about the circuit, just thining out loud.

 

[Crusader]

Yes but I just checked an Optima retailer FAQ web site and yes they can be run in parallel as long as the batteries are of the same type capacity and aproixmate age service life etc. So this rules out running it parallel with my car or truck battery. This Optima battery cost me $150+ so hey what's another $150.

I already have 12 Dewalt XRP 9096 batteries and this is frankly getting spendy at even $45 each at eBay prices.

 

[Crusader]

In case you're wondering why on earth would I need a ton of Dewalt batteries just Google "dewalt powered drill bike" and you will see. I use this for marketing door to door for my business. Makes flyer and door hanger runs very fast and frankly fun. Walking neighborhoods is a drag and is very slow. As much as we all hate spoliations and all - this is still the best way to market for my business. I never knock on doors....... nothing I hate more than door knockers.

So logistically I use a cooler full of ice packs for my used batteries so they will take a charge without an error HOT code upon charging. I typically carry 4 spares on the bike ready for quick change out.