[RE-wrenches] battery vent control for lead acid

[Jerry Shafer]

Wrenches, Dave,

I have had success with CPU fans, 12,24,48 vdc, 120 vac use no power and
run them through a thermostat set at 80 to 90 degrees

Fun times

On Tue, Jun 3, 2025, 1:30 PM Roy Butler via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Dave,
>
> The Morningstar Relay Driver can work as a stand alone unit, it can derive
> it's power from the battery bank.
> This allows it to be programmed for voltage based relay operation which is
> ideal for vent fan applications.
>
> The relay channels are dry contacts and have a current limit of 750mA.
> This will run a fan somewhat larger
> than the good old Zephyr vents.
>
> Roy Butler
> Four Winds Renewable Energy, LLC8902 Route 46 <https://www.google.com/maps/search/8902+Route+46?entry=gmail&source=g>, Arkport, NY 14807
> 607-324-9747
>
> Education is when you read the fine print; experience is what you get when you don’t.
>
> “The less people know, the more stubbornly they know it.”
>
> Although no trees were killed in the sending of this message,
> a large number of electrons were terribly inconvenienced.
>
>
>
> On 6/3/2025 2:22 PM, Dave Tedeyan via RE-wrenches wrote:
>
> Hi all,
>
> What are people using these days for venting a good ol' 48v flooded lead
> acid battery box? I am upgrading an off grid system. There is a one year
> old set of flooded lead acid batteries, so those will stay, but everything
> else will be new. I plan on using a Sol-Ark inverter. The existing battery
> box does not have any active ventilation, so I would like to add some. In
> the past, I have used the Zephyr Power Vent Fans, like this one:
>
> https://www.thesolarbiz.com/zephyr-power-vent-fan-for-48-volt-battery-systems.html
> They don't seem readily available, but I think I can find one somewhere.
>
> More importantly, what would you use to control this? Sol-Ark inverters do
> not have any kind of relay for it. I have found external controllers in the
> past (Yandina LLC Vent Control), but I cannot seem to find any right now.
> There is one noted in the fan documentation (Solar Converters,
> Inc. VCS1AH), but that does not seem available anywhere right now. Does
> anyone have a recommendation for either a vent fa controller or a whole
> venting solution?
>
> Thanks!
> -Dave
> --
>
> [image: Logo] <https://www.sungineersolar.com/>
> Dave Tedeyan, P.E.
> Owner | Sungineer Solar
> p: he | him | his
> a: 1653 Slaterville Rd.
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>
> <https://www.google.com/maps/search/1653+Slaterville+Rd.+%C2%A0+%7C%C2%A0Ithaca,+NY+14850?entry=gmail&source=g>| Ithaca,
> NY 14850
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> c: (607) 270-0370
>
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