Multiplus inverter charger

CabMike

I currently have 800 watts of panels in parallel on my rv roof an 150/50 MPPT controller and 3- 100amp battleborn batteries. Will the current charge controller support it? Can I switch to to a Multiplus?

Thanks, Mike 

SumPower

What is the VOC of the panels?

BB.

I guess you are home based around Arizona (USA, 120 VAC system)?

https://www.victronenergy.com/upload/documents/Datasheet-Multiplus-inverter-charger_2kVA-and-3kVA-120V-US-EN.pdf

2,000 or 3,000 Watt/VA inverters?

Both are available in 12 or 24 volt battery bus units... For that level of power, would suggest 24 VDC, but for an RV, 12 VDC battery bank would be "OK" for 2,000 Watt unit... For a 3,000 Watt unit, would suggest 24 VDC if you can swing it... DC current at high wattages needs heavy wire:

3,000 Watts * 1/10.5 VDC (battery cutoff) = 286 Amps max continuous DC current @ 12 volt battery
3,000 Watts * 1/21.0 VDC (battery cutoff) = 143 Amps max continuous DC current @ 24 volt battery

For 100 amp @ 12 volt batteries, they have a maximum discharge rate of 100 Amps per battery...

https://battlebornbatteries.com/wp-content/uploads/2022/11/BB10012H-Datasheet-05.21.2024.pdf

If you put 3 in parallel (300 AH), your max sustained current would be 300 Amps (1 hour from 100% to 0% SoC)... So would (barely) support a 3kWatt AC inverter at full load.

An 800 Watt array would charge the battery bank at (nominal conditions):

800 Watts * 0.77 array+controller deratings * 1/14.5 volts nominal charging voltage = 42.5 Amps typical (best case) charging current.

A 50 amp output MPPT charge controller should be OK.

For best efficiency of MPPT controller, typical array MPPT voltage should be around 2x battery voltage, or around 30 VDC... You can run the array upwards of 100-110 volts or so Vmp-array, depending on how cold of weather your run the RV (Vmp-array rises in cold to sub freezing weather).

You don't want the Voc-array-cold voltage to exceed the 150 VDC (maximum MPPT controller input voltage) to avoid damaging/ruining the MPPT controller. ("high voltage" arrays allow you to run smaller AWG cable and run the solar wiring longer distances).

-Bill