How long will this generator take to charge this battery bank?

[rd400f]

Hi
Hypothetical system is...

Diesel generator specs....
• 6.3kW/6300W (max) power output, 5.5kW/5500W (continuous) power output
• 27.4 amps max
• 1 x 230V 32A socket + 1 x 230V 15A socket
• 25L Diesel Fuel Tank
• 12 hours continuous operation @ 75% load
• Sound Level @ 7m | 92dBA @ full load
• Enclosed Canopy for quieter operation
• Built-In 2 Wire Auto Start/Stop System

Inverter is

Growatt 5kW ES​

AC Charger

• Charge Current 60A
• AC Input Voltage 230VAC
• Selectable Voltage Range 90 - 280VAC (For Home Appliances)
• Frequency Range 50/60Hz (Auto Sensing)

Battery bank might be....

• NOMINAL VOLTAGE (V):51.2
• ENERGY (WH):24576

• Max Continuous Discharge Current	150A
  Max Continuous Charge Current	100A
  Cycle Life	3500 (80% DOD)
  Internal Impedance	≤80mΩ
  Charge Voltage	56V
  Discharge Cut-off Voltage	44V
  Charge Temperature	0°C to 60 °C
  Discharge Temperature	-20°C to 60 °C

Question is how long would this generator have to run to charge the battery up to ...lets say 24Kwh
Just roughly without worrying about losses and such.?

Thanks
Richard

 

[John Frum]

Its a 480 amp hour battery and the charger can deliver 60 amps.
480amp hours / 60 amps = 8 hours.
From memory the ac2dc charger in those units kinda sucks and doesn't really do constant voltage(absorption).

 

[MurphyGuy]

Your battery capacity is 480 amp hours, your charger can do a max of 60 amps.

Assuming your battery is completely dead, 480 divided by 60 = 8 hours. Realistically, it will probably be 9 hours since the charger is going to slow down as the battery gets close to its top end.

 

[squowse]

Probably worth verifying the 60A charge rate with a clamp meter. Some manufacturers can exaggerate.

 

[Haxx]

Is the spf5000es that different from the spf5000us? My 5000us can charge @ 100a...

 

[rd400f]

Is the spf5000es that different from the spf5000us? My 5000us can charge @ 100a...

Hi
I just checked the Growatt web site and their spec for the SPF 5000 ES is actually 80A
Dont know about the 5000US.
Richard

 

[schmism]

Realistically, it will probably be 9 hours since the charger is going to slow down as the battery gets close to its top end.

Ya'll have overlooked the fact that 60a @50v DC = 25a (ish) 120v AC. Its my understanding that the growatt will likely transition the entire inverter load to generator (grid bypass) while its "grid" charging. The specified generator has a max output of 27a so you get 2a of overhead.

said another way if your avg continuous load on the inverter is like 1200w (10a) that leaves like 15a to charge. or about half the expected output to the charger or twice as long as the 8hrs listed.

This is why you frequently see the recommended generator size at 2x the inverter output.