Battery temperature and charging advice

Hello, This is my first post here although I have been reading as much as I can for some time now. I have many screenshots of BB's calculations regarding bank sizing etc!
I am upgrading my battery bank to two Trojan T105's or a pair of crown 220's at 12volts. I decided to measure the temperature of the battery Compartment on this cold frosty morning. It was a minimum of 2degrees c and a max of 19.5c after having the heater on (blown air pipes pass through the battery area under the bed)I live in an off grid trailer with limited space so the bank can't be moved. Will this temperature have a big effect on the life span of the batteries? I know that the ambient air temp will not be the true battery temp as it takes time for this to change. I'm expecting the temp to be between 2-20 degrees between winter and summer.
As you can see below, I'm well under panelled right now so plan to supplement the batteries using a sterling 30amp charger. I will take the batteries to about 25% dod over 2 days with the solar supplementing in between and then will run the generator. Is this a satisfactory arrangement until I can get some more panels?
I'm About to buy a new sterling pro charge ultra 30a charger to run from a Honda eu10i generator.
Many thanks for any help,
Jim
Victron MPPT 12/30 cc with Bluetooth
Victron BMV battery monitor
Victron 300w pure sinewave inverter
2x 100w mono panels.
I am upgrading my battery bank to two Trojan T105's or a pair of crown 220's at 12volts. I decided to measure the temperature of the battery Compartment on this cold frosty morning. It was a minimum of 2degrees c and a max of 19.5c after having the heater on (blown air pipes pass through the battery area under the bed)I live in an off grid trailer with limited space so the bank can't be moved. Will this temperature have a big effect on the life span of the batteries? I know that the ambient air temp will not be the true battery temp as it takes time for this to change. I'm expecting the temp to be between 2-20 degrees between winter and summer.
As you can see below, I'm well under panelled right now so plan to supplement the batteries using a sterling 30amp charger. I will take the batteries to about 25% dod over 2 days with the solar supplementing in between and then will run the generator. Is this a satisfactory arrangement until I can get some more panels?
I'm About to buy a new sterling pro charge ultra 30a charger to run from a Honda eu10i generator.
Many thanks for any help,
Jim
Victron MPPT 12/30 cc with Bluetooth
Victron BMV battery monitor
Victron 300w pure sinewave inverter
2x 100w mono panels.
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Comments
Here's a good read on the subject, http://batteryuniversity.com/index.php/learn/article/charging_at_high_and_low_temperatures
2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric, 700 ah @24 volt AGM battery bank. Plenty of Baja Sea of Cortez sunshine.
This wouldn't normally be a problem, as off-grid we tend to typically use the generator just to bulk charge up to ~ 80-85 SOC, and finish with solar doing a temp compensated absorb. If your solar can finish charging, and the controller has a remote temp sensor to properly finish absorb, it isn't an issue. If you're relying pretty much entirely on the generator though, it could be.
Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
I have looked into the charger and it is the only one here (uk) that is customisable e.g. 14.8v absorb and can be run from a poor power source (generator) I cannot afford the Honda inverter genset yet but allready have a standard 2k generator. There is also a remote temp sensor. It mentions temp compensation but doesn't give specific values.
Thank you for the link to more information, I will read that tonight.
I feel confident that the batteries will not be affected at the temperature ranges stated so I will go ahead and order them, I just need to build a bigger box and vent it to the outside. I think the temp sensor mounts to a terminal but I may be wrong. I will try and line the box with some insulation too.
Many thanks, Jim
Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
Jim