Can somebody help me out with the math here?
If the battery lasts for 100 minutes of use and it charges while being used to 80% in 120 minutes, that means that the battery charges to 80% in 20 minutes when not being used, right?
And just in case you were wondering, this thing will last about an hour on one of the 1lb green Coleman camping propane tanks. And without mention of an included adapter, those are the only ones that you can use. Don’t even think about hooking it to a 20 lb or larger grill tank
Using this website, I get 40 minutes to charge to 80%.
It would be 51 minutes for a full charge, starting at 0.
4000 mah
500 A (12v, 6000w)
There’s a user manual on Amazon.
(Please Note: I’m not employed by Woot, but I volunteer to help in the forums.)
Yeah see, that’s where you drop me.
The Woot description says that this is propane powered and can recharge while in use.
Nowhere does it say that recharging requires plugging in, thus one would rightly assume that a propane-powered water heater that charges while in use derives its recharging from the use of propane.
That’s why I was incredulous and pointed out that you could use this for 100 minutes until the battery was exhausted, but the use of this for 120 minutes would recharge the battery to 80%.
And I thank you for providing the link to the user’s manual which downgrades its usability to 25 to 45 minutes per 1 lb can of propane.
This further illustrates the parabola of marketing wanketry.
The description says a fuel consumption rate of 20 MJ/hr, which with 100% efficiency will net you 1,900 BTUs. That’s 1500 short of the 20,500 quoted.
Considering the fuel consumption is closer to 35 5 megajoules per hour (as indicated in the user manual 25 to 45 minute run time), that brings the efficiency to around 70%. That’s at the bottom end of a propane tank water heater efficiency and absolutely abysmal compared to the 85+% efficiency rating of most on demand water heaters, while some can be in excess of 95% efficient.
“Ultra-heating efficiency” my tardis