Well I have had a couple of productive days getting some re-wiring done on the van’s habitation electrics. I have re-housed various relays and switches into a new ABS enclosure and built in a new ground plane and busbars and finally got around to cable numbering everything.
While this was all going on, I have had the battery disconnected. It is the Halfords HLB 618, 115 Ah rated. It’s about 3 years old and I think might be on the way out. I want to try measure it’s capacity. It was fully charged when disconnected. When I reconnected it this evening, the battery was reading 12.8 V. I have put it under soak test since about 16:30 this afternoon by powering a cooler box, which draws close to 4 amps., and I have since turned on some LED lighting. I checked up about an hour ago. The voltage under load has now dipped below 12 V. My battery monitor tells me the battery has depleted to 82% state of charge.
The plan is to check it again before calling it a night, recording the S.O.C, disconnecting the load and battery, letting it sit overnight and checking the voltage in the morning. I want to compare what my monitor assumes is the S.O.C to what the rested voltage says.
I wonder how low the voltage should dip under load for this long? I should have done this test when the battery was new, just to have something to compare.
While this was all going on, I have had the battery disconnected. It is the Halfords HLB 618, 115 Ah rated. It’s about 3 years old and I think might be on the way out. I want to try measure it’s capacity. It was fully charged when disconnected. When I reconnected it this evening, the battery was reading 12.8 V. I have put it under soak test since about 16:30 this afternoon by powering a cooler box, which draws close to 4 amps., and I have since turned on some LED lighting. I checked up about an hour ago. The voltage under load has now dipped below 12 V. My battery monitor tells me the battery has depleted to 82% state of charge.
The plan is to check it again before calling it a night, recording the S.O.C, disconnecting the load and battery, letting it sit overnight and checking the voltage in the morning. I want to compare what my monitor assumes is the S.O.C to what the rested voltage says.
I wonder how low the voltage should dip under load for this long? I should have done this test when the battery was new, just to have something to compare.
Liked by: baguette