Seems to me that you are on the edge for that size battery in winter. If
the inverter is going to be on, converters are kind of nutty to me. I
could see having one 24V for the freezer but... I only use Concorde AGM's
when I have to. Is there an AH counter or Batt Mon?
Good Luck
Dave Angelini Offgrid Solar
"we go where powerlines don't"
http://members.sti.net/offgridsolar/
e-mail [email protected]
text 209 813 0060
> Answers to questions:
>
>
>
> The batteries are Discover EVL16A-A batteries. A single string of 8: 390AH
> @48V nominal. We had one fail last year, showing a significantly raised
> internal resistance when tested under a load then under charge. There is
> another one showing signs of weakness, but currently under a 30A draw it
> is only 0.12V lower than the highest battery in the mix, and 0.05V from
> the average battery voltage. Readings were: 6.0, 5.88, 6.0, 5.93, 5.92,
> 5.91, 5.93, 5.94 using a 1500W space heater as a constant load during the
> test.
>
>
>
> There are more loads than just networking and security that the client
> just recently disclosed. Gotta love the added loads to the design. There
> is a satellite DVR, 2x4 camera webcam systems, cell modem, simplisafe
> security system, chest freezer, 4 wifi range extenders to serve the less
> reliable security camera system, and 26W LED dusk-dawn light. I have
> already talked to them about thinking hard on what items can be removed
> for the winter at least (DVR is going away, and one of the camera systems
> too, likely the one requiring the wifi range extenders). All other seasons
> the system is fine.
>
>
>
> As for the DC converter(s) we would get a voltage specific converter for
> any unique voltages, depending on the # of unique items, we would likely
> abandon that approach if it got to bee too complicated. But thank you to
> all that provided guidance there. The meanwell units seemed to have the
> right specs to do the job if we go that route. We would also install them
> using a LVD of some sort, set somewhere above the standard low voltage
> cutoff of the rest of the system. We would also only go this route if all
> AC loads could be removed by doing this, allowing us to remove the 36w
> idle draw of the Outback.
>
>
>
> With Regards,
>
>
>
> Daniel Young,
>
> NABCEP Certified PV Installation ProfessionalTM: Cert #031508-90
>
>
>
> Lead Systems Designer for:
>
>
>
> <http://www.dovetailsolar.com/> www.dovetailsolar.com
>
> Ph: 740-274-0139
>
>
>
> Weâve completed nearly 400 renewable energy projects! Check out a few
> in our photo gallery:
>
<http://www.dovetailsolar.com/Our-Work.aspx?path=commercial+-+solar+electric>
> http://www.dovetailsolar.com/Our-Work.aspx?path=commercial+-+solar+electric
>
> This email message and attachments are intended only for the addressee.
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>
> From: RE-wrenches [mailto:[email protected]] On
> Behalf Of Starlight Solar Power Systems
> Sent: Tuesday, January 16, 2018 11:08 AM
> To: RE-wrenches <[email protected]>
> Subject: Re: [RE-wrenches] Off grid DC Loads: DC Converter
>
>
>
> I too would like to know the make and model of batteries that are loosing
> capacity. In the past 5 years we have experienced abnormally high failures
> from 2 brands.
>
>
>
> Larry
>
> On Jan 15, 2018, at 2:00 PM, Jay <[email protected]
> <mailto:[email protected]> > wrote:
>
>
>
> Can you tell us:
>
>
>
> Battery make,model and size?
>
>
>
> Jay
>
> Peltz power.
>
>
> On Jan 15, 2018, at 12:32 PM, Daniel Young <
> <mailto:[email protected]> [email protected]> wrote:
>
> Hello Wrenches,
>
>
>
> I have a client that is running into an issue with his off grid system.
> The system is 3yrs old and they are starting to notice their AGM battery
> bank is loosing capacity, in reality they are noticing the generator is
> triggering more often. They want to try to lower the frequency of the
> generator triggering if possible.
>
>
>
> The system is not occupied during much of the winter (unconditioned, which
> further hurts the battery bank capacity), but the client has a security
> system with a cell modem installed and always on. This fortunately allows
> Optics-RE access, but unfortunately based on the FNDC shunt readings, is
> pulling a consistent 150w from the battery bank. Currently the network and
> security equipment is powered from standard wall-warts running on AC.
>
>
>
> Iâd like to help the client extend the time between generator cycles by
> taking the network loads and powering them directly from the battery bank
> (the loads are all 12Vdc). Does anyone have any recommendations for a
> decent quality DC_DC converter that would be applicable? Given inverter
> losses and the efficiency of the typical wall-wart, Iâd expect the
> running loads to be closer to 80-100w rather than the 150w we see now. The
> intent is to then take the inverter into search mode, or even switch it
> off, to remove the tare losses there, and also to take all the wasted
> power from the standard wall-warts and go to a single, more efficient dc
> power supply.
>
>
>
> Any recommendations on a good DC_DC converter are appreciated.
>
>
>
> With Regards,
>
>
>
> Daniel Young,
>
> NABCEP Certified PV Installation ProfessionalTM: Cert #031508-90
>
> Dovetail Solar and Wind
>
>
>
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Dave Angelini Offgrid Solar
"we go where powerlines don't"
http://members.sti.net/offgridsolar/
e-mail [email protected]
text 209 813 0060
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