That would be tricky and involve switching. Float current to a fully charged
battery but full load current to the load is not a problem. But when the power
goes out, you want the fully charged battery to be immediately connected to the
load. But when the power comes back, you want full voltage to the load but
current limit to the battery so you would have to break the connection between
the battery and the load.
Could be done. Still probably a chance of a one millisecond drop in power to
the load or something like that.
Once the battery is full, you can have everything bridged again.
Personally, I have never had an issue with all three connected in parallel with
no LVD. If you have outages often enough that an LVD is every actually
operating, you need an auto start propane generator.
From: TJ Trout
Sent: Tuesday, September 7, 2021 10:24 PM
To: Chuck McCown
Cc: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] Parallel rectifier and load
Limit current TO battery with no restriction from the battery, I guess I'm
trying in reinvent the wheel because such beasts already exist, but I haven't
found anything within budget for 48v.
On Tue, Sep 7, 2021, 6:58 PM Chuck McCown <ch...@go-mtc.com> wrote:
Which way would take priorit? Yes you can use a linear regulator in a current
limiting configuration.
Sent from my iPhone
On Sep 7, 2021, at 5:00 PM, TJ Trout <t...@voltbb.com> wrote:
Is there some combo of a diode and another component I could use to allow
full current one way and limited current to 1am the other way?
On Tue, Sep 7, 2021, 3:56 PM TJ Trout <t...@voltbb.com> wrote:
This is lithium, the lvd is integrated to the pack. I'm going to attempt
to use a 360w meanwell charger on a lithium charge profile paralleled with the
battery and the load, I wasn't sure if the load would stay offline until the
batteries get to the loads minimum voltage to run or what the behavior would be
because I won't be limiting charge current to dedicate load current like a
'real' system would have. Trying to build a system on a budget for a friend,
this whole system will cost less than a 48v DC ups or 48v rectifier with ups
function.
On Tue, Sep 7, 2021, 3:44 PM Chuck McCown via AF <af@af.afmug.com> wrote:
Most rectifiers for “float “ service have current limiting. And yes
the batteries will present a heavy load and it will take some time for the
voltage to come up. If the lvd reconnects the batts the voltage could drop so
much they will disconnect again and flop for a while. You need a rectifier
that can pull the live load plus a heavy charging current. I would go twice my
load or more for this reason. BTW not a fan of lvd. Do you really want to
totally kill your customers in the unlikely event the bats go that low? I quit
using them 20 years ago and have never regretted that decision.
Sent from my iPhone
> On Sep 7, 2021, at 4:29 PM, TJ Trout <t...@voltbb.com> wrote:
>
>
> What happens when you parallel your supply, load and batteries
without using a 'dc ups' which provides lvd + charge current limit?
>
> I'm using batteries with a Integrated lvd so I am just concerned with
the behavior after a long outage where the load and battery will be fighting
for the supply current?
>
> Can't find any low cost options @ 48v to limit charge current (DC
ups) Maybe I can use a diode one way and a current limiting device the other
way to the battery?
> --
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> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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