Hacker News Reader

HNHacker News

Top New Best Ask Show Jobs

Comment by aerophilic | Hacker News Reader

Full thread

aerophilic·

From the specs: BATTERY

Battery capacity = 605 Wh

Average runtime (no payload) = 90 mins Recharge time = 120 mins

So you basically have to buy ~4 batteries ($4620 each) to get a 9 hour work day out of them...

View on HN

> a 9 hour work day out of them

A _continous_ 9 hour work day. You could alternatively just program it for a 24 hour work cycle, and get the same 9 hour work day on a single battery in segments instead.

EDIT: Nevermind. I assumed that it had the capabilities to dock and charge by itself (just like any robot vacuum does), but apparently it doesn't.

Cheap compared to the $1200 Ethernet port.

What makes their batteries 20x more expensive? EV batteries were $176/kWh back in 2018.

https://about.bnef.com/blog/behind-scenes-take-lithium-ion-b...

I would hazard a guess of proprietary form factor and handling needs since these aren't mounted in a car chassis, combined with low production volumes initially.

How do you figure 9 hours? 3 batteries should be a 24 hour day if you are charging 2 and running 1

You might get away with 3 (depending on load), but then you would need an additional charger ($1360 each). But there was a reason I use the ~ symbol =). Personally if I were doing this I would get more chargers, but it is really up to the use case. Either way, assuming 5,000 hours/year, you are looking around $20-30/hour of effective cost (depending on what you count for “everything else)

Reply on news.ycombinator.com