Are you planning to add a battery backup for OBI devices?
SteveInWA:
Quote from: Confuzed on December 11, 2015, 07:46:21 am
Quote from: SteveInWA on December 09, 2015, 03:54:11 pm
Quote from: dircom on December 09, 2015, 10:44:16 am
Quote from: SteveInWA on December 05, 2015, 08:45:38 pm
Quote from: restamp on December 05, 2015, 07:32:50 pm
I have a friend, BTW, who is running his OBi200 off a 12.6V trickle-charged battery. So far, it's run fine.
A Lead acid battery can be 13+ volts
would you recommend using a linear regulator?
or a 12V Step-up/Step-Down Voltage Regulator?
I believe that most equipment that uses "wall wart" style, 12VDC adapters should be able to sufficiently regulate lead-acid battery voltage without additional, external voltage regulation.
There are a number of cheap solutions for building your own DC-DC UPS. Grab one of these, for example, add a 12V battery and a suitable charger and your
good to go.
http://www.mini-box.com/picoUPS-100-12V-DC-micro-UPS-system-battery-backup-system
Here is a sample implementation: http://e.molioner.dk/projects/ups/
Basically, the device takes a 15V-18V DC input and outputs 12V DC to the device while charging the battery. If the DC input gets cut (power outage) the device will draw from the battery.
The OpenUPS and OpenUPS2 do basically the same thing, but add support for Windows monitoring and custom programmability if you want to pay for it: http://www.mini-box.com/OpenUPS?sc=8&category=981, http://www.mini-box.com/OpenUPS2?sc=8&category=981.
There are a variety of solutions available on that site (and elsewhere) that will allow you to build your own UPS with varying levels of features. Personally I would go cheap and grab the picoUPS, a 12V deep discharge scooter battery or two, and appropriate charger.... could put something together for $100 or so that might give you hours of runtime.
I took a look at those two links (thanks!). Apparently, that little circuit board is only capable of switching between a DC power supply's input, and the battery's input; it is not stepping down (bucking) the DC voltage to 12VDC. So, if any of the attached equipment can't handle >12VDC, then that solution is useless. Just a warning.
Also, with regard to the type of batteries to use: I would strongly recommend against using a standard automotive battery indoors in a residential environment (as opposed to a data center/industrial environment with proper ventilation and fire suppression systems). In the unlikely event of a water landing in the unlikely event of a fire, you have a box full of liquid sulfuric acid and hydrogen gas reaching dangerous temperature levels. Aside from that, hydrogen is off-gassed at some level -- not good to have in the house.
Instead, use batteries designed for UPS service: valve-regulated, absorbed glass mat, sealed lead-acid batteries. These batteries use an electrolyte suspended in fiberglass, recombine almost all gas, and are non-spillable.
Here is an example spec sheet: http://www.bb-battery.com/images/MANUAL/technical%20manual(VRLA).pdf
UPS products designed for extended runtime will have a battery connector on the back panel, allowing more VRLA battery packs to be added. These products also have sophisticated battery charging systems designed to prolong battery life. Building a safe and reliable UPS is not a DIY project.
mrcinaz:
Quote from: pjs344 on December 05, 2015, 01:23:03 am
Not everyone can afford a Cell phone and that is why they use a free or low cost voip provider.
Anyone that can afford an Obi device can probably afford a cell phone. Not everybody needs the latest iPhone or Samsung, and not everybody needs continuous 4G data downloads. My wife and I use factory refurb Huawei smart phones I picked up on eBay at $35 each. Android OS, I forget which version.
We use an MVNO (look up the term) that buys and resells Verizon 3G bandwidth. We have no contract. We prepay 2,000 minutes at a cost of $80, which are good for a full year, 4 cents per minute of telephone. Data use costs 5 cents per megabyte. We don't use much of that. We buy the $80 minutes from a wholesaler for $72. Unused minutes roll over if you refill before time runs out. My wife recently refilled and now has over $100 in unused minutes. Cheaper phones are available, and at $6/month for usage, I will repeat that I think anyone that can afford an Obi can probably afford not only a cell phone but a smart phone. It is a matter of knowing what options are out there.
(Our MVNO is Page Plus, but there are numerous others. You don't have to use CDMA phones.)
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