Bank size..
It seems you could be quite close to a 50% discharge or over after just two days of sailing and hanging on the hook.
If you charge with alternator only the general rule of thumb is that you will be able to recharge to about 75 to 80% of capacity when using only an alternator. To get beyond this SOC you would need very, very long engine run times to reach 100%.
Perhaps I misread but this is what I saw in your post..
Two nights of anchor lighting = 30 ah X 2 = 60 ah
Two days of refrigeration = 84 ah X 2 = 168 ah
These two draws alone are = 228 amp hours over just two days on the hook.
If you can only effectively recharge to 80% of your banks capacity while under cruising conditions, via alternator charging, that makes your usable bank 328 amp hours and not 410 unless you have a way of getting back to 100%. From an 80% SOC that leaves a 123 ah usable bank before you hit the 50% SOC threshold. Based on your numbers just your anchor light and refer use 144 ah per day.
If you were to draw 228 amp hours from even your full 100% 410ah bank you are already below 50% of bank capacity and you have not even added in stereo, lighting, or nav equipment.
If you were out for a few days and drew off 228ah from an 80% SOC you could potentially see a 25% SOC..
Perhaps I just misread your numbers.....
Bill,
It seems you could be quite close to a 50% discharge or over after just two days of sailing and hanging on the hook.
If you charge with alternator only the general rule of thumb is that you will be able to recharge to about 75 to 80% of capacity when using only an alternator. To get beyond this SOC you would need very, very long engine run times to reach 100%.
Perhaps I misread but this is what I saw in your post..
Two nights of anchor lighting = 30 ah X 2 = 60 ah
Two days of refrigeration = 84 ah X 2 = 168 ah
These two draws alone are = 228 amp hours over just two days on the hook.
If you can only effectively recharge to 80% of your banks capacity while under cruising conditions, via alternator charging, that makes your usable bank 328 amp hours and not 410 unless you have a way of getting back to 100%. From an 80% SOC that leaves a 123 ah usable bank before you hit the 50% SOC threshold. Based on your numbers just your anchor light and refer use 144 ah per day.
If you were to draw 228 amp hours from even your full 100% 410ah bank you are already below 50% of bank capacity and you have not even added in stereo, lighting, or nav equipment.
If you were out for a few days and drew off 228ah from an 80% SOC you could potentially see a 25% SOC..
Perhaps I just misread your numbers.....
