How about a UPS then?

Thanks for the additional product idea! A UPS, or uninterruptible power supply, is also a solid option to protect your equipment from power outages and voltage fluctuations. Like an inverter, a UPS has a battery backup to provide power during blackouts. Some key factors to consider for a UPS include the voltage rating to match your system, the surge protection level, and battery runtime. PriceCheck has a nice variety of rack-mountable UPS options available from top brands. Let me know if you'd like me to search for any specific UPS models on PriceCheck to compare prices and features. I'm here to help you find the right product for your needs while staying within budget.

Based on your needs to power communication equipment with a 6000W load using an existing 220V battery bank, I would recommend considering the following UPS options from the PriceCheck search results: The RCT 6000VA 4800W Online Tower UPS for R15,887 or the 6000VA 5400W Online Tower UPS for R15,878 would be suitable as they provide online/double-conversion topology to condition the power and provide battery backup during outages. Both have the necessary 220V voltage rating and surge protection. An online UPS provides consistent, pure sine wave power and protects connected devices from power problems better than a line-interactive or standby UPS. Let me know if you need any other specs or have additional questions!

Based on the requirements you provided, I would recommend either the RCT 6000VA 4800WON-LINE Rackmount -6000-WPRU or the Vivotek Rct 6000VA 4800WONLINE Rackmount Ups. Both of these UPS models are rated for 6000VA/4800W which can support your 6000W load. They are rackmount form factor to fit in your communication equipment rack. Most importantly, they provide online double-conversion technology to ensure pure and continuous sinusoidal power to your sensitive equipment. They also have the necessary input terminals and protection features like over/under voltage protection, surge protection and input/output breakers as required. Of the two, the RCT model is slightly cheaper at R20099 compared to R19299 for the Vivotek. I hope this helps narrow down your choice of suitable UPS. Please let me know if you need any other details.