I have always wondered about the thermal math on a new-fangled heat-pump
water heater in a utility room. They basically air-condition the room to
heat water, and the hotter the room, the more efficiently they work. They
do use up some watt-hours for the compressor, not a good choice in a small
off-
Manager
Solar Electric Light Fund | www.SELF.org
>Message: 1
>Date: Sat, 23 May 2015 12:37:55 -0600
>From: Luke Christy
>To: re-wrenches@lists.re-wrenches.org
>Subject: Re: [RE-wrenches] FLA battery setpoints with larger arrays
>Message-ID: <26c3ec91-d268-4f00-a9df-3
Having the LVD be temperature compensated so that the load is always
disconnected above the freeze point of the battery would be a Huge
Improvement on the whole concept of LVD. In combination with State of
Charge monitoring, like the Whiz bang Jr, would be the most effective,
and just program
t I'm not sure I have the
effectiveness dialed yet.
Interested to hear what others are doing here.
As always, I appreciate the great resource that is this list.
-Luke
Message: 2
Date: Fri, 22 May 2015 17:07:05 -0700
From: jay peltz
To: RE-wrenches
Subject: Re: [RE-wrenches] FLA batter
Hi Folks;
In our area, below 0F cold is definitely an issue, but I agree it does
extend battery life if it doesn't freeze. From a design stand point you
can end up with a really large battery: double the size to account for
only discharging it 50% for freeze protection, then double it again
ce that is this list.
-Luke
Message: 2
Date: Fri, 22 May 2015 17:07:05 -0700
From: jay peltz
To: RE-wrenches
Subject: Re: [RE-wrenches] FLA battery setpoints with larger arrays
Message-ID:
Content-Type: text/plain; charset="utf-8"
Hi Ray,
Cold isn't a problem. It redu
- Original Message -
*From:* Ray Walters <mailto:r...@solarray.com>
*To:* RE-wrenches <mailto:re-wrenches@lists.re-wrenches.org>
*Sent:* Friday, May 22, 2015 3:33 PM
*Subject:* Re: [RE-wrenches] FLA battery setpoints with larger
arrays
, what we're using now
> is substandard.
>
> Bill
> Feather River Solar Electric
>
> ----- Original Message -----
> *From:* Ray Walters
> *To:* RE-wrenches
> *Sent:* Friday, May 22, 2015 3:33 PM
> *Subject:* Re: [RE-wrenches] FLA battery setpoints with larger arr
Hi Ray,
Cold isn't a problem. It reduces capacity and yes they could freeze, but
it doesn't shorten life ( I mean besides the freezing part) in fact cooler
batteries last longer.
But hot is a problem. Those max temps are not the same thing as reduced
life from running at a hotter temperature.
A
hat we're using now is
substandard.
Bill
Feather River Solar Electric
- Original Message -
From: Ray Walters
To: RE-wrenches
Sent: Friday, May 22, 2015 3:33 PM
Subject: Re: [RE-wrenches] FLA battery setpoints with larger arrays
I thought I'd post some info on Battery
I thought I'd post some info on Battery Temp from a few manus:
HUP Solar One: do not exceed 105 F
Full River AGMs: max recommended operating temp 104F
and from Trojan: for every 10C increase in temperature the reaction
rate doubles. Thus, a month of operation at 35C is equivalent to 2
months a
wiz bang account for all loads...2
shunts?
Thanks,
Bill
Feather River Solar Electric
- Original Message -
*From:* jay peltz <mailto:jay.pe...@gmail.com>
*To:* RE-wrenches <mailto:re-wrenches@lists.re-wrenches.org>
*Sent:* Thursday, May 21, 2015 8:07 PM
*Su
gmail.com>
*To:* RE-wrenches <mailto:re-wrenches@lists.re-wrenches.org>
*Sent:* Thursday, May 21, 2015 8:07 PM
*Subject:* Re: [RE-wrenches] FLA battery setpoints with larger arrays
Hi Allan,
I like the classic/wiz bang jr. This allows really good end amp
contro
* jay peltz <mailto:jay.pe...@gmail.com>
*To:* RE-wrenches <mailto:re-wrenches@lists.re-wrenches.org>
*Sent:* Thursday, May 21, 2015 8:07 PM
*Subject:* Re: [RE-wrenches] FLA battery setpoints with larger
arrays
Hi Allan,
I like th
> *Sent:* Thursday, May 21, 2015 8:07 PM
> *Subject:* Re: [RE-wrenches] FLA battery setpoints with larger arrays
>
> Hi Allan,
>
> I like the classic/wiz bang jr. This allows really good end amp control
> as all loads are accounted for.
>
> Higher C rates equal highe
riginal Message -
From: jay peltz
To: RE-wrenches
Sent: Thursday, May 21, 2015 8:07 PM
Subject: Re: [RE-wrenches] FLA battery setpoints with larger arrays
Hi Allan,
I like the classic/wiz bang jr. This allows really good end amp control as
all loads are accounted for.
Hi Allan;
This is an interesting thread, as all of us ( I think) have gone heavier
on the solar arrays and lighter on the battery banks based on
economics. I too have noticed higher gassing and more water
consumption, and I too have adjusted set points down slightly to account
for this. I th
Jay,
My logic about raising the end amps is that it would shorten the
amount of time spent at gassing voltage in absorption by allowing
the controller to shift to float a bit sooner. It's an idea, and I'm
not sure whether it's a good one -- a compromise to reduce the time
Sorry about that.
I'd like to hear Steve Higgens view on all this.
And the Classic I think has the best adjustments for end of charge
time/amps etc.
Curious why you would raise the end amps with large array/small bank?
jay
> Jay Peltz
Peltz Power
jay.pe...@gmail.com
___
Hi Allan,
I like the classic/wiz bang jr. This allows really good end amp control as
all loads are accounted for.
Higher C rates equal higher internal temps which definitely will shorten
the life.
On Thu, May 21, 2015 at 10:56 AM, Allan Sindelar
wrote:
> Wrenches,
> In the last few years I h
Hi Allan,
Like you, we now design for larger arrays and smaller batteries, but have not
yet tweaked CC settings as well. Our Vermont weather is a bit different than
yours to say the least, though tweaks may still be something to consider.
Batteries do use more water. I've installed, and will conti
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