Forum Discussion
Matt_Colie
Feb 17, 2021Explorer II
Panhandle and Wopachop,
Please do not mislabel yourselves. There is no fault in being uneducated to some very specific subjects. I lucked out here. I sailed a number of long quiet watches with a man that survived WWII in submarines. In that situation, batteries were their life. I learned a lot from him and probably missed 15~20% of what he tried to pass along.
One thing that I did have to learn on my own to cure my own issues with charging the house bank was the wire size is really important and none of the tables work. Those tables are all for a 3% voltage drop. At 14V, that is about 0.4V. With the entire life of a lead/acid battery being between 11.9 and 12.6 volts, you can't take a hit like that. The difference in recovery time for a pair of GC2s being charged at only 14.0V verses 14.4 is real close to forever.
Matt
Please do not mislabel yourselves. There is no fault in being uneducated to some very specific subjects. I lucked out here. I sailed a number of long quiet watches with a man that survived WWII in submarines. In that situation, batteries were their life. I learned a lot from him and probably missed 15~20% of what he tried to pass along.
One thing that I did have to learn on my own to cure my own issues with charging the house bank was the wire size is really important and none of the tables work. Those tables are all for a 3% voltage drop. At 14V, that is about 0.4V. With the entire life of a lead/acid battery being between 11.9 and 12.6 volts, you can't take a hit like that. The difference in recovery time for a pair of GC2s being charged at only 14.0V verses 14.4 is real close to forever.
Matt
About DIY Maintenance
RV projects you can tackle on your own with a few friendly pointers.4,353 PostsLatest Activity: Mar 10, 2025