Thank you. Exactly what I needed to know.
IMHO just get a regular UPS. Small ones can be had for about $35 and would power the hub for a long time.
Reportedly many of the Amazon brand gear does ‘not’ have this, or didn’t the last time I looked into it a year+ ago. Lots of unhappy people who bought the wrong thing thinking they were saving a bit of money…
+1 on the larger size. The modem needs power too.
Note that the Amazon link I posted is for a USB UPS, not a portable battery bank like most people get. It appears to charge the battery when it drops a few percent. The input and output are on separate voltage/charge controllers.
I have a small "always on " battery pack in series with the wall plug. It should be good for 36 hours or so. $29 on Amazon (https://www.amazon.com/gp/product/B00CLNI49S/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1). I didn’t need much since I have a whole house generator. I just wanted continuous data during short outages.
I hadn’t thought of the always-on feature. Good point.
My current thinking is something like this pass-through power bank for the USB-powered weather hub, and maybe a small trolling motor battery in parallel with the 12v power supplies for modem and cameras, possibly with a “battery tender” charger to keep it topped off… But I’m a water engineer, not an electrician, so what do I know. Is that a feasible idea?
This may be the solution I’ve been looking for. It uses a sealed lead acid battery (an additional $15-20) for backup during power outages and has enough 12v circuits to host my modem, cameras, DVR and maybe a security system as well. With addition of a 12v USB charger, it should also keep my WxFlow hub running without a USB power bank.
For the connections, these pigtails should work with my 12v devices.
Here’s a simpler approach that might work for just the Weatherflow hub and modem, at least for a brief outage.
“This battery backup requires a minimum current draw of 75mA”
The Hub is so energy efficient that this becomes a factor. Mine draws about 50mA if I believe my cheap USB meter. If a device isn’t drawing the minimum, a USB power supply thinks that it is attached to a phone that has completed charging…and turns the output power off…
Using that hybrid device to power hub and router at the same time might solve that problem
Soon as I get back on the island I’ll be trying a USB battery bank and see how that goes. The wifi router and cameras/DVR will go on a $5 APC UPS I got from a thrift store (plus new battery of course). If any issues with the weather hub I’ll report back.
Ok, here’s a test. We just had a storm and a brief power outage. Good news, the USB allowed the hub to save data. Bad news, the 110v UPS kept the modem going but… DSL service was lost along with the power outage, so the UPS was no help at all. Errr… Neighbors tell me all phone service was interrupted during the power outage so it looks like I’ll have to take this up with my phone/internet provider.
Hopefully the solution David described above will backfill your data. Hub battery backup question
Yes - . I have a power bank in series between the USB charger and hub, so all data was retained, at least for the short duration of this outage.
I also have the USB charger plugged into a UPS, so between the two that should keep the hub going for days. Whether the hub has the memory capacity to save that much data is another question. We shall see, it’s just a matter of time before another extended outage on the island.
Looks nice and simple
I assume it solves the problems of a normal power bank turning off?
Would you like to share what it is, and its specs?
This is the link but the photo is wrong and some of the description is wrong. I bought it December 2013.
New Trent PowerPak Xtreme - (12000mAh) Rugged Series 2A/1A Dual USB Ports Portable Back Up External Battery Charger/Power Bank/Power Pack for the Apple: iPad 4 / 3 / 2/ iPad mini, iPhone 5 / 4S / 4 /3GS, iPod Touch (all version); Samsung: Galaxy Note, S4 / S3 / S2, Galaxy Nexus ; Google: Nexus 10 / 7, HTC: ONE, One X, One S, Droid Incredible 4G; Nexus 4, LG: Optimus series; Blackberry: Z10, Torch, Tour; Motorola: Razr Maxx HD, Droid series; Nokia: Lumia 900 / 800 / 700, Sony: Xperia series, GoPro, and most 5V chargeable devices. (NEW VERSION iCarrier, charges via a micro-USB input charge port) https://www.amazon.com/dp/B00DUKJ5CQ/ref=cm_sw_r_cp_apa_i_fov1DbBXW22EP
I can provide photo and specs of my setup the next time I’m there (second home) but meanwhile here’s a link to the product, which I purchased at Office Max 2-3 years ago. The specs don’t provide this information but I simply tried various power banks that I had on hand, and found that this one has pass-through charging and stays on all the time.