Bmoore
Well-known member
So I have a new boat, new batts ( 1 starter and 2 house batteries ). The house batteries are joined in parallel. I fish on the drift a lot running bait tank etc...yesterday my house batteries were reading 11.2 volts while under way and the starter was reading 14.4-14.6. Shouldn't the house batteries also show a 14+ reading while under way ? I plugged in the on board charger last night ( Dual Bank -20amp ) and starter showed 14+ volts this morning, but house batteries were at 12.3 volts. I decided to plug my 20 amp Portable charger up to the house batteries instead and it said they were at 54% charged. It proceeded to charge at 14+ volts and they are close to 100% this evening. What gives ? I can't figure out if alternator on boat is powerful enough ( Yamaha F300 ) or is it the onboard charger not having enough power to bring them up. I park my boat away from my house, so need to be able to recharge the night after fishing and the night before. I'm thinking of just using the onboard charge for the starter battery and portable for the house batteries. Can I run these at the same time. Batteries are separated, but did notice one of the house batteries is connected to the starter, but only with a negative. Not sure if I only saw 11.2 volts on house batteries while under way because they were so low already ? I thought it would still send 14+ volts at them like it does the starter. Kind of a lot of questions here, but just curious if anyone has experienced something like this. Side note... I have a Blue Seas ( Off-On-Combine ) switch. Dealer said to use the On setting and engine will still charge all batteries. The combine should only be used in the event I need extra reserve to start engine. What gives ? Alternator issue ? Onboard Charger Issue ? I have no idea
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