Check out this page to learn more about 28V DC for ground power units.
28V for GPUs
What is Ground Power Units like e.g. GPU 28V?
The onboard electrical system of smaller aircraft and of helicopters is a 28 VDC voltage.
The aircraft / helicopter can start their engine using the onboard battery, but it may be an advantage to use an external Ground Power Unit to do the job (see below).
ITW GSE provides green 28 VDC ground power units based on solid-state or battery technology. Also a diesel driven 28 V unit is available.
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