I recently purchased the Companion Brand Rover 40 AH Power Station from BCF. Currently listed for $529 at their "Club Price" right now. Supposedly retails normally at $800.
The unit is extremely good. It runs my Skywatcher HEQ5 Pro mount flawlessly and seems to last forever. On sidereal tracking its meter says it is drawing 8 watts, and when slewing it draws 27 watts. I am mainly visual, and a typical session for me is about 3 hours. I do a lot of slewing in that time chasing double stars all around the sky. The meter on the power supply says for such a session (i.e. 3 hours of viewing and slewing) the power pack only depletes by 4/5 percent. I estimate it would power the HEQR Pro just on sidereal for days and days.
Hope the link works, otherwise search BCF for Companion Rover 40 AH Power Supply.
https://www.bcf.com.au/p/companion-r...on/614922.html
Good luck,