Portable Power Station Rental

I'll be in Iceland next August for the total solar eclipse and will be bringing along a telescope to capture the event. I need a portable power station that can keep my setup running for a few hours minimum and would like to pick up one in Rekjavik or Keflavik before heading to the Westfjords.

I've poked around the interwebs and found Iceland Camping Equipment renting an Anker Solix C300X (288Wh) that meets my specs and light on my wallet as a bonus. I can use a cigarette plug that connects to the car but there is a possibility I will need to set up my equipment far from my parking spot.

Is there any website or store that you recommend or is Iceland Camping Equipment a good rental company, from your experience?