the Otherpower.com Discussion Board || Comments Adding More Batteries

Front Page - [Homebrewed Electricity-- (wind) (solar) (hydro) (steam) (controls) (storage) (mechanical)] - Classifieds - Site News
Everything - Newbies - [Remote Living-- (housing) (heat) (light) (water)] - Rants & Opinion - Diaries - Our Products

Adding More Batteries | 14 comments (14 topical, editorial)

Re: Adding More Batteries (3.00 / 0) (#7)
by Tritium on Wed Aug 20th, 2008 at 02:36:41 PM MST
(User Info)

As one who deals with many DSL modems I can say most run on DC even though they may have a low voltage AC supply. AC Wall Warts are cheaper so the manufacturer uses an AC Wall Wart and puts a bridge rectifier on the board in the modem.

Thurmond

[ Parent ]

Re: Adding More Batteries (3.00 / 0) (#8)
by dnix71 (yahoo.com 'dnix71') on Wed Aug 20th, 2008 at 03:08:49 PM MST
(User Info)

I opened the modem (an ATM, really). Westell C90-610030-06, Rev H

It has a full wave bridge just above the big round cap on the upper left. I plugged it into 13.2 volts dc from the Harbor Freight pdu and it seems to work fine.

I'm posting using it now. If I get desperate for power, I'll do it that way. What does 10.5 vac work out to full wave rectified? Is 13 dc underpowered?

[ Parent ]

Re: Adding More Batteries (3.00 / 0) (#9)
by Ungrounded Lightning Rod on Wed Aug 20th, 2008 at 03:57:18 PM MST
(User Info)

What does 10.5 vac work out to full wave rectified?

10.5 * 1.414 = 14.8470

But there's also "droop" due to current pulled from the cap between the peaks. DC doesn't droop.

There will be a regulator or two downstream to reduce the voltage to what is actually used. So you're probably just fine.

[ Parent ]

Adding More Batteries | 14 comments (14 topical, 0 editorial)

Menu

· create account
· How to use the board
· FAQs
· search the board
· Google search the board
· Old Otherpower Board

Login

Make a new account

Username:

Password:

You must be a registered user to post here. It's easy and free, and the link is on the upper right side of your page.
All trademarks and copyrights on this page are owned by their respective companies. Postings are owned by the poster, but may be deleted or moved at the ADMIN's sole discretion. The Rest © 2003 Forcefield.
You can Email the board ADMIN here. PLEASE include the username you signed up with!