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<font size="2">Dave,<br>
<br>
The Morningstar Relay Driver can work as a stand alone unit, it
can derive it's power from the battery bank.<br>
This allows it to be programmed for voltage based relay operation
which is ideal for vent fan applications.<br>
<br>
The relay channels are dry contacts and have a current limit of
750mA. This will run a fan somewhat larger<br>
than the good old Zephyr vents.<br>
</font><br>
<pre class="moz-signature" cols="72">Roy Butler
Four Winds Renewable Energy, LLC
8902 Route 46, 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.
</pre>
<div class="moz-cite-prefix">On 6/3/2025 2:22 PM, Dave Tedeyan via
RE-wrenches wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAM3Q7f3tL7-bUQNZ6S+fr77fqWT2pDpOdac61bSa9gVFpQ5H3w@mail.gmail.com">
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<div>Hi all, </div>
<div><br>
</div>
<div>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:</div>
<div><a
href="https://www.thesolarbiz.com/zephyr-power-vent-fan-for-48-volt-battery-systems.html"
moz-do-not-send="true" class="moz-txt-link-freetext">https://www.thesolarbiz.com/zephyr-power-vent-fan-for-48-volt-battery-systems.html</a></div>
<div>They don't seem readily available, but I think I can find
one somewhere.</div>
<div><br>
</div>
<div>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?</div>
<div><br>
</div>
<div>Thanks!<br>
-Dave</div>
<span class="gmail_signature_prefix">-- </span><br>
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style="color:rgb(236,189,0);font-size:11pt;font-weight:700">Dave
Tedeyan, P.E.<br>
</span><span
style="font-size:11pt;font-weight:700"><font color="#ecbd00">Owner |
Sungineer Solar</font><br>
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style="font-size:10pt;color:rgb(0,0,0)">he | him | his</span><span
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a: </span></span><span
style="font-size:10pt;color:rgb(0,0,0)">1653 Slaterville Rd.</span> <span
style="font-size:10pt;color:rgb(0,0,0)">| Ithaca, NY 14850</span><br>
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style="font-size:10pt;color:rgb(0,0,0)"> www.sungineersolar.com</span></a><br>
<span style="color:rgb(236,189,0)"><span
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