Some battery temperature data during high amp recharge
Northstar group27 AGM battery. 90Ah capacity.
5:58AM 53Ah from full, 12.1v under 0.8 amp load
62.2f battery, 61.3f Ambient
Apply Meanwell's 40 amps set to 14.9v( accounting for voltage drop on wiring at 40 amps)
35 minutes later at ~14.6v at battery terminals, amps begin tapering from 39.1.
Temperature 73f
~1 hour later 14.6v accepting 21 amps...... 78.9F.
~ 5 hours later accepting 0.4 amps at 14.5v, 72F, ambient ~67.4f
Battery warmed more than expected. Ambient temperature only increased 6 degrees during the ~6.5 hour charge.
Thermocouple sensor tip located on side of case, on middle cell, mid height with a big blog of arctic silver thermal grease held in place with black Gaffers tape and one layer of reflectix over that surrounding 4 battery sides.
More glad than ever I can control the voltage the alternator is allowed to maintain when driving. The 14.9v the original VR allowed, combined with a hot battery, has to have been bad for this AGM, which is on about deep cycle #350, yet still performing admirably, as long as it gets this high amp recharge every so many deep cycles.
Battery located Not in engine compartment, but under van body behind driver's seat. The sensor's location allows it to read engine heat when driving and it takes a minute or 3 after engine shutdown for an accurate battery case temperature reading. This engine heat in this location is also more than expected. Longer highway drives likely help heat battery much more than expected in this location.
Overall, I greatly underestimated battery temperature rise during charging, and when alternator charging, this heating can be even more pronounced, and detrimental when voltage is allowed to be held up in the high 14's.
I've been using this 4 channel K type thermocouple device, and so far have sensors located on battery, alternator casing, and voltage regulator transpo540HD added heatsink.
http://www.amazon.com/Perfect-Prime-4-Channel-Thermometer-Thermocouple--200~1372%C2%B0C/dp/B0142HFA06/ref=sr_1_9?s=hi&ie=UTF8&qid=1464559464&sr=1-9&keywords=k+type+thermocouple
5:58AM 53Ah from full, 12.1v under 0.8 amp load
62.2f battery, 61.3f Ambient
Apply Meanwell's 40 amps set to 14.9v( accounting for voltage drop on wiring at 40 amps)
35 minutes later at ~14.6v at battery terminals, amps begin tapering from 39.1.
Temperature 73f
~1 hour later 14.6v accepting 21 amps...... 78.9F.
~ 5 hours later accepting 0.4 amps at 14.5v, 72F, ambient ~67.4f
Battery warmed more than expected. Ambient temperature only increased 6 degrees during the ~6.5 hour charge.
Thermocouple sensor tip located on side of case, on middle cell, mid height with a big blog of arctic silver thermal grease held in place with black Gaffers tape and one layer of reflectix over that surrounding 4 battery sides.
More glad than ever I can control the voltage the alternator is allowed to maintain when driving. The 14.9v the original VR allowed, combined with a hot battery, has to have been bad for this AGM, which is on about deep cycle #350, yet still performing admirably, as long as it gets this high amp recharge every so many deep cycles.
Battery located Not in engine compartment, but under van body behind driver's seat. The sensor's location allows it to read engine heat when driving and it takes a minute or 3 after engine shutdown for an accurate battery case temperature reading. This engine heat in this location is also more than expected. Longer highway drives likely help heat battery much more than expected in this location.
Overall, I greatly underestimated battery temperature rise during charging, and when alternator charging, this heating can be even more pronounced, and detrimental when voltage is allowed to be held up in the high 14's.
I've been using this 4 channel K type thermocouple device, and so far have sensors located on battery, alternator casing, and voltage regulator transpo540HD added heatsink.
http://www.amazon.com/Perfect-Prime-4-Channel-Thermometer-Thermocouple--200~1372%C2%B0C/dp/B0142HFA06/ref=sr_1_9?s=hi&ie=UTF8&qid=1464559464&sr=1-9&keywords=k+type+thermocouple
