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Author Topic: Warming a battery shed with genny exhaust  (Read 2454 times)
stephend
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« on: January 29, 2009, 10:21:18 PM »

I'm building a combined generator + battery shed 1.5m underground, with an additional 0.5m of wall added above ground and then plan to cover the whole thing with an earth roof.  The idea is to reduce noise and help protect the batteries from getting too cold in winter (typically -5 outside at coldest).  Walls will be mostly solid concrete with a thin layer of external insulation.
The shed will be divided in 2, 1 room for water cooled genny and 1 for batteries with a thin brick dividing wall.

I was wondering whether it would be worthwhile piping the exhaust from the generator past the outside walls of the battery shed to help heat the room.  Something like frotter's pit of doom, but with the pit being long and flat and directly adjacent to the battery shed wall.  Is it necessary or desirable to heat the battery room in winter or is a well insulated room good enough?  (With vents for gases of course!)
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Justme
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« Reply #1 on: January 29, 2009, 11:02:45 PM »

What temp do you expect in the bat room with no heating?

Bats dont want to be hot or cold.

Justme
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2 x Victron Multiplus II 48/5000/70
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stephend
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« Reply #2 on: January 30, 2009, 01:26:25 PM »

What temp do you expect in the bat room with no heating?

Bats dont want to be hot or cold.

I guess that's really my question to you Smiley  Do other off-griders in zero degree winters actively heat their battery sheds or not?
Does charging the battery produce enough heat to keep them warm on it's own?
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dhaslam
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« Reply #3 on: January 30, 2009, 04:33:26 PM »

You will probably find that noise from the exhaust also needs consideration.   There was  a previous discussion on burying the exhaust pipe with an expansion area at the end of the run.   Batteries need ventilation so you are going to have some cooling from air circulation and this might be a way to use the exhaust heat.   
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bar
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« Reply #4 on: January 30, 2009, 08:48:39 PM »

Hi

I have similar concerns.

currently my battery store is an unheated ventilated timber shed, with the generator running next door.

I have noticed a sharp drop in battery output during the cold weather. However my generator only runs to charge the batteries and when charging the batteries tend to warm a little themselves. when the generator is not on there is no possibility of gaining any heat from it. looking to the generator for heat is therefore not a solution - unless you can use the cooling water system feeding heat into a heat store for slow release in the battery compartment.

thought about bringing batteries into house; running ch pipes into battery compartment; enclosing batteries in insulated compartment (maintaining ventilation) with electric heater for cold weather run off the batteries.

currently doing nothing and accepting the charge will occur every 3 days rather than 5 days (approx).



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camillitech
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« Reply #5 on: January 31, 2009, 05:30:43 AM »

Morning chaps,

Sitting your batteries on a sturdy pallet off the ground and putting 2" polystyrene around them will make a big difference.

Cheers, Paul
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http://lifeattheendoftheroad.wordpress.com/

'Off grid' since 1985,  Proven 2.5kW, Proven 6kW direct heating, SMA SI6.OH, 800ah Rolls, 8kW PV ,4xTS45, Lister HR2 12kW, , Powerspout pelton, Stream Engine turgo, 60 x Navitron toobs and a 1500lt store. Outback VFX3048 and 950ah forklifts for backup,
billi
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« Reply #6 on: February 02, 2009, 11:32:18 AM »

Hi

My battery is insulated  and we have had frost  today  and now sunny but cold  the PV is charging and the temp sensor   of the charge controller automatically changed the "ABSORB voltage set point"  from normal 29.6V (warm day) to 31 Volt this morning

So in cold conditions make sure the battery is charged fully  and the use off a tempsensor makes definitely sense , if the temp is varying a lot at the battery

Billi


Here from my manual  for lead acid batteries (open)


Quote
Non-Battery Temperature Compensated System
If a battery remote temperature sensor is not available the Absorb and Float voltage regulation
set points can be adjusted for the expected weather conditions. The following table shows the
appropriate adjustments for both Absorb and Float voltage regulation set points for weather conditions
above or below 77˚F / 25 C
EXPECTED TEMPERATURE ADJUST SET POINT 12V    24V   48V
             Average = 95˚F / 35˚C Subtract    0.30V 0.60V 1.20V
       Average = 86˚F / 30˚C Subtract          0.15V 0.30V 0.60V
-------------------------------------------------------------------------------------------------------------------------------
                Average = 68 F / 20˚C Add        0.15V 0.3 V 0.60V
                Average = 59˚F / 15˚C Add       0.30V 0.60V 1.20V
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