[ARC5] 28 volt high-current supplies?

[scottjohnson1 at cox.net]

It seems this subject gets covered regularly, but here goes:

Buy a switcher with 125-150% capacity of the load.  Float two 12V VRLA or
gel cells across the supply, floating them at around 27.4-27.6 V.
(Battery capacity commensurate with starting current demand, but 50AH is
probably good for anything up through a GRC-14/19)
Two lawn tractor batteries in series is an economical choice if you have
smaller demands, such as command sets
This will may just about any load designed to be operated from a MV or
aircraft electrical system happy.
Take the batteries off float if you won't be operating often, but keep track
of their state of charge.
Been doing this for over 40 years, and it is the way to go, unless you have
a huge MG set.

Scott W7SVJ

-----Original Message-----
From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> On Behalf
Of Charles via ARC5
Sent: Thursday, February 17, 2022 4:55 PM
To: arc5 at mailman.qth.net
Subject: [ARC5] 28 volt high-current supplies?

Looking for ideas on 24-28 volt supplies that won't break the bank. 
Shipping on big iron is REALLY expensive these days even if a suitably sized
transformer can be found... Switching supplies from China aren't too bad.
Two big batteries and a smaller charger to keep them up when not operating
seems to be about the best compromise.

I'd like to be able to make 100 amps DC (which needs a 240 volt outlet, of
course).

Any thoughts? thanks

-Charles

WB3JOK/0 since 1976

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