Powering a 2500W inverter. How many batteries is just enough?

[Karate Chopped]

I've done a poke around with the search function, since I thought this would be a common question, but haven't been able to find the answer I want.
Basically I'm looking at getting a handle on how many batteries does it take to run a 2500W inverter?

Obviously it depends on the load, but I'm thinking the occassional heavy draw for a few minutes (ie coffee machine in the morning) and then the rest of the time fairly low draws like chargers, some lighting, maybe a small hand tools.
A coffee machine would be 1000W-ish, which equates to about 100A at 12V. So fairly sizeable currents.

So the question is, can a deep cycle batter put out 100A (AGM/lithium/SLA?) for a few minutes at a time? Or will I need two or more batteries in parrallel?
Or should I run two batteries in series, and change everything to a 24V system, and drop my load amps to 50A? Or does it make no difference how I wire the batteries since each battery is seeing the same load.

For anyone that has a 2500W inverter, how many batteries do you have hooked up?

Thanks in advance

 

[e9999]

I think you need to know the specs of both battery and inverter to answer that meaningfully. They will tell you what current the specific battery can provide, for how long, what voltage the inverter can handle, etc. Those vary a lot. Then figure it out based on all that, including cable sizes, which may be hefty.

But talking in general terms, 100A is certainly possible. My Redodo 12V 100Ah LiFePO4 can do up to 100A (limited by the BMS) continuously according to their specs.

 

[Karate Chopped]

Thanks for the reply.

I whole heartedly agree, but much like the megapixel wars of the 2000s, everyone either doesnt provide the amp output, or I'm betting over inflates the number.

What I might do is hook up one battery, and then if it gets too hot, add another battery.

 

[LandLocked93]

I converted all non-factory accessories to 24V, as you are considering, largely to keep the current flow less than it would be with 12V.
Twin 200Ahr AGMs have run a coffee maker multiply times w/o issue (they're short duration anyway). So too a 110V ice maker for 36hrs non-stop.
The inverter did not get hot, nor did the batteries.

For me the case simply about less current flowing throughout the truck, lessening potential for problems and lowering the cost in wiring/relays/fusing to build it out.
Tho 24v devices are a little more expensive so YMMV in total depending.

 

[Karate Chopped]

I converted all non-factory accessories to 24V, as you are considering, largely to keep the current flow less than it would be with 12V.
Twin 200Ahr AGMs have run a coffee maker multiply times w/o issue (they're short duration anyway). So too a 110V ice maker for 36hrs non-stop.
The inverter did not get hot, nor did the batteries.

For me the case simply about less current flowing throughout the truck, lessening potential for problems and lowering the cost in wiring/relays/fusing to build it out.
Tho 24v devices are a little more expensive so YMMV in total depending.

The good thing is that this setup will be for a hut/caravan. So it will only have panels, controller, batteries, inverter, plus a few lights.
This means there shouldn't be any cost implications going 24V, or the implications are small. But I have the added benefit of low amp cabling between the battery, inverter and controller. And easier time sourcing breakers/fuses.