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Old 08-01-2020, 08:20 PM   #1
Mjc
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Roof fan question

I have solar on my Seneca and was wondering if I could or should run my roof vent fans while RV is parked to help maybe keep it cooler when it is in storage. It has been 120 this week and I am thinking of some ways to help get heat out. So if solar keeps batteries charged any reason not to run them while parked?
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Old 08-01-2020, 08:35 PM   #2
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duplicate post
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Old 08-01-2020, 09:06 PM   #3
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what is the condition/state of charge of your batts as measured with a hydrometer? age of batts? assuming new-er batts that are holding a max or near max charge this is, mostly, a math problem.

what does the fan draw? but with the coach powered up there are likely other minor power draws. and you don't have 24-hr sunshine. how much of the reserve power is used at night? on cloudy days? this is where the condition/state of charge really is in play. older batts may not have a lot of reserve.

not a precise analogy but think of the charge in a batt as a glass of water. fully charged new batts=a full glass (8-oz). the older the batt the less water is in the glass when fully charged (<8oz). power consumed is like a small hole in the bottom of that glass. your idea will work if the water dripping into the glass (solar panels) is >= to the water dripping out the bottom. your reserve is the amount of water left in the glass when no or less water is dripping in at night and on cloudy days. also..does your fan have a t-stat you could adjust for cooler nightime temps? rain sensor/wind sensor?

the only way you'll know for sure us to try it out. good luck.
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Old 08-01-2020, 09:51 PM   #4
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If you mount something like the Victron BatteryProtect on the 12v power leg, you should be okay.

That way, if your fan draws your batteries down too far - too many cloudy days, or something just interferes with charging - the BP will shut it down and you won't overdrain your batteries and kill them.

https://www.amazon.com/Victron-BPR00.../dp/B01KIF2BGW
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Old 08-01-2020, 10:08 PM   #5
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Not a bad idea. I live in lake havasu and I am not sure what a cloudy day is anymore. Haven't seen a cloud in month's.
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Old 08-02-2020, 12:50 AM   #6
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You probably don't have to worry about shoveling four feet of snow off of your panels, either.

(I run a roof fan at low in storage just to keep things fresh. The BP will shut down the 12v if battery voltage drops too far, and then when the solar kicks in and raises the voltage again, it turns it all back on. I just don't want to completely discharge $600 worth of batteries down to nothing and ruin them.)
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Old 08-02-2020, 04:20 AM   #7
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Not sure of the real temperature difference the fan will make moving that 120 air around. Open the vents and wait for the inevitable dust storm, the choice is heat or dirt.
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