Victron multiPlus compact 12/2000 battery capacity

jfowler

Was reading through my inverter manual and it’s recommending 350-1000ah of battery capacity for the 12/2000. I purchased this inverter through an affiliate link and the design is set up with 2-12v 100ah lithium batteries. I’ve seen quite a few set ups and inverter/battery bundles using 200ah with this inverter. Any harm setting it up this way?

BB.

Li Ion batteries can supply more current than Flooded Cell types... However, if you have a BMS on the Li Ion battery (or other battery design issues), you may find they have an XXX amp (Like 100 Amp for some popular 12 volt batteries) maximum current draw per 12 volt @ 100 AH LiFePO4 (or other) battery bank. For example:

https://www.solar-electric.com/battle-born-bb10012-100ah-12v-lithium-battery.html

BB10012 Specifications:

• Usable Capacity: 100 Amp-hours
• Voltage: 12 Volts
• Continuous Output: 100 Amps
• Maximum Output: 200 Amps for 30 seconds
• Lifetime Capacity: 300,000 Amp-hours
• Lifetime Cycles: 3000- 5000 Cycles
• Dimensions: (L x W xH): 12.75" x 6.875" x 9.0"
• Weight: 29 pounds
• Cell Type: LiFeP04
• Warranty: 10 years

Just to give you an idea, the maximum current draw for a 2,000 Watt inverter at 10.5 volts (voltage drop in wiring, discharged battery bank operating voltage), would be:

• 2,000 Watts * 1/0.85 AC inverter efficiency * 1/10.5 volt cutoff (yours may be higher) = 224 Amps

For Flooded Cell Lead Acid batteries, the typical recommendation is 100 AH @ 12 volts (minimum suggested AH capacity) per 250 Watt AC inverter max output. (battery able to provide ~11.5 volts at 50% discharge under full load).

-Bill