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Hi - I'm upgrading an offgrid solar system that has 24V DC appliances. A pylontech UP2500 24V battery has a recommended discharge current of 55A, 1.3 kW. The 15-second peak discharge is 100A.
With four in parallel the recommended discharge is 220A, 5.2 kW. I'm thinking of connecting these to a Multiplus 24/5000.
What do you think - is this OK or is it pushing the limits a bit?
https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom
Bumping this topic up again. Any thoughts, no matter how vague? :-)
@balachai Without stating anything about your demands/peak consumption the only response I have that the manufacturers recommendations are basicically the minimum you should consider. The system will cope, but at 4kW loads may not provide power for very long. I'd imagine you won't run it at full power all the time. For an off-grid application and large inverter your batteries are very conservatively sized. Expect a shorter life expectancy for the battery if they are going to work hard and near their max ratings all the time. Start by properly understanding your exact requirement first and then you may find even a smaller inverter will serve you well. Larger inverters consume more power too so .. a lot to think about.
Hi @ejrossouw - thanks for that! The system would see loads of 4 kW occasionally, only for around 30 minutes and often during the day when some power would come from solar rather than all of it out of the battery. Even less frequent would be loads up to 5 kW for 30 minutes. Even though these loads are infrequent, I do want to supply them so I figured a 3 kW inverter would be too small. Zero-load power is 30W for the 24/5000 compared to 20W for the 24/3000. That's OK. I'm happy that you think the batteries are conservatively sized.
The inverter is only 4kW (5kVA) so your inverter will come up well short trying to run 5kW off it for 30min ;) Also at that level it will warm up and derate so you may have to consider a parallel solution. Maybe time to speak to your Victron dealer to help you with the correct solution and make sure your exact requirements are well defined.
