BODs SR2

Hope to get out and use the boat after all the work I’ve put in on various stuff. I’ll let you know how the new batteries fare. Cheers.

Alternator fitted and change of regulator seems to have done the trick a steady 14.4V at the alternator terminal now. Still learning on this but know a little bit more now. Every day’s a school day. What puzzles me is why it was doing what it did. I can understand the need for B2B where you have a mismatch in batteries ie if there’s a lead starter and an AGM or Li service cluster, but obviously not to try and work around an underlying problem.

Great set of guys. Sorted. New regulator pack fitted and tested £12. Would have been £10 but I didn’t have cash. also confirmed the rotation is correct so I don’t have to but a new fan blade. The fan sucks air through I thought it blew air through. Result. 😀

I’m there now😀

B+ to D+ with the engine revved is about 0.1 Another problem I’m having is finding a reverse fan blade. Only found one place on the internet and they won’t answer the phone. Two alternator suppliers I’ve tried can’t help. Maybe I need a different make with the fan the right way round.

Thanks for all your replies. Yes it was a sunny day and solar was connected. Ok so solar off. Nothing else connected to battery. Meter across battery. 13.3V. Start Engine to steady tick over. Voltage ramps up quickly to around 14.4. BUT THEN it starts to climb ever so steadily bit by bit and over a few minutes (around 10 ) it has reached 15V.???? Engine off for 20 mins. Repeat above and get same result. Engine speed doesn’t effect this. By the way the fan shroud is the wrong way. Will need to get anti-clockwise one.

Thanks for all your replies. Yes it was a sunny day and the solar was connected. I’ll take the readings again with it off. Also let you know which way it turns.

Right. Off work and a sunny day. Alternator tests 14.9 at the battery connection with meter negative connected to its case. Measures 14.45 at the 12v input terminal (is it D+?) picture attached I think it may be a nock off Lucas from China. Waiting to hear from supplier on Monday. Picture attached. Additional info 2.6V at the terminal the thin wire is attached to at rest ignition on.

Spoken to Alpha batteries very helpful. Said to get a dc-dc charger and set it to gel which will output correct voltage. Use wet lead starter until it dies then replace with AGM which charges at 14.7. Don’t have to replace alternator https://www.alpha-batteries.co.uk/victron-energy-orion-tr-smart-12-12-30a-360w-isolated-dc-dc-charger-ori121236120/

Measured across battery terminals when running. I think it’s 70A. Seems constant over range of revs. No idea what the alternator make is no markings. Is there anything that can be fitted maybe?

Problem. Bought 2 gel service batteries replacing wet lead. Gels need 14.4V max but alternator output is 14.72. Can anyone advise on best way to fix this. Regards.

Sorry Tony Gels. I’ve mailed Alpha Batteries with the info see what they say and I’ll pass it on.

FYI I was given this table by alpha batteries. Applicable for gel batteries:

Measured 14.72 across battery. That’s ok for agms isn’t it?

FYI bought 2 carbon gel batteries to replace the wet lead ones I had. Still lead but filled with carbon gel rather than water. Claims of being more robust and up to 1500 charging cycles as opposed to 500? Main thing is can still use existing alternator. If I'd got AGM I'd have had to upgrade the charging system to a higher voltage. Contacted Merlin to see if their smartguage will work with them.