[RE-wrenches] Programmable Battery Charger

[toddcory at finestplanet.com]

the 2:1 transformer also offers ac isolation. im not so sure id want the hot line of 120vac, via a diode, on the dc part of a system.
 
this configuration (known as the "DT Kludge") was a common (and expensive) workaround for outback fx series inverters which unfortunately only had one ac input. usually people with battery based, grid tied systems want the ability to backup with a generator too.
 
i have this on my home's system:

generator > 2:1 xmfr > full wave bridge rectifier > MX/FM charge controller > ckt brkr > batteries.
 
the charge controller does the regulating and current limiting... for example if the generator or transformer cannot do ~3.5 kW, the MX/FM can be set to a lower dc max current setting.
todd
 
 

On Monday, December 15, 2014 8:02pm, "jay peltz" <jay at asis.com> said:


HI Jerry,
Just a standard bridge rectifier, with correct amp rating.
 AC to diode to CC, thats it.
All regulation is via CC.
jay


On Dec 15, 2014, at 7:30 PM, Jerry Shafer wrote:

Very interesting, what diodes did you use to rectify the AC, it sounds similar to the wind machine designs I have worked with. Do you use a coil to regulate the AC amps to the diodes, it seams like you would need a "throttle control" the current someway besides the diodes them selves or the CC. Jerry  


On Mon, Dec 15, 2014 at 3:51 PM, jay peltz <[ jay at asis.com ]( mailto:jay at asis.com )> wrote:
Hi Kirk,
If you use a 200vdc midnight CC you'll have no issues.
When you rectify 120vac its up around 166vdc
( uses the peak vac which is around 170vac.)
For a 150vdc max controller ( midnite 150)  or a 144vdc ( outback FM) then a buck transformer or standard transformer is the trick to reduce the AC and hence the DC for these lower voltage units.
jay
peltz power




On Dec 15, 2014, at 5:38 PM, Kirk Herander wrote:



This has been discussed on this list in years past. It is possible to use an outback charge controller as a battery charger. You need to put the 120 AC into a bridge rectifier, then feed the 120 DC into the controller’s PV input. So you’ll have an 80 amp battery charger.
 
Kirk Herander
VT Solar, LLC
Proven PV provider since 1991
www.vermontsolarnow.com
dba Vermont Solar Engineering
NABCEPTM Inaugural Certificant
VT RE Incentive Program Partner
[ 802.863.1202 ]( tel:802.863.1202 )
 


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