Put the fan at the intake near floor level and a passive vent at the ceiling
On Tue, May 6, 2025, 12:09 PM Ray Walters via RE-wrenches < [email protected]> wrote: > Hi William; > > Poor ventilation could be part of it, but I've also seen corrosion > problems from: > clients over filling the cells, > EQing to often, > absorption voltage set too high and for too long, > too high a charge rate, (too large an array) > too high a temperature, due to floor heating and/or insulated battery box. > > my best systems seem to be on the lower side of array size relative to > battery size, with batteries in a basement or garage that stays above > freezing, but below 60F most of the year. > > Sorry I don't have a line on explosion proof fans, but I have a client > with a 120 vac radon blower for the battery exhaust that seems to do much > better than the traditional DC battery fans. (Not my install.) > > I've only seen batteries blow twice: > 1) Idiot was arc welding next to a HUP battery and multiple large sparks > went right on to a cap; result: blew the top off the cell. He had been told > to construct a battery enclosure around the batteries, but never did. > 2) a loose connection at a battery terminal arced, melted the lead until > the molten lead melted through the top of the case and ignited the > hydrogen, result: burned a clear flame for a few seconds and went out > without any major damage. > > So my take away is that unless the ignition source is in the cell or > within an inch of the cap, the hydrogen is too low a concentration to > ignite. Actually, are lead acid battery internal plates and their external > connections considered "explosion proof"? > > Ray Walters > Remote Solar > > > On 5/6/2025 12:20 PM, William Miller via RE-wrenches wrote: > > Friends: > > > > I have two flooded battery arrays that have steel cases that are > corroding. I am sure poor ventilation is the issue even though we have > passive vents high and low. I think I need active ventilation. > > > > Does anyone have knowledge of a 120VAC explosion proof ceiling mounted > exhaust fan? > > > > Thanks in advance. > > > > William > > > > Miller Solar > > 17395 Oak Road, Atascadero, CA 93422 > > 805-438-5600 > > www.millersolar.com > > CA Lic. 773985 > > > > > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > Change listserver email address & > settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other:https://www.mail-archive.com/[email protected]/http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette:http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios:http://www.members.re-wrenches.org > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > >
_______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/[email protected]/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
