jamie preston

agreed, everything you say makes sense. i will still investigate further before i purchase said products but looking favourable.

you seem to have infinite knowledge on this issue! thankyou for you sharing it. i indeed have an iskra175amp alternator. i have been running 2 no 110ah valence batteries direct from the alternator since july. with regular cruising, did a run for about 10 days during the summer cruising for approx 8-10 hours per day. no issues noticed at all. i had an occasion seen my voltmeter reading in excess of 15 volts. didn't like this voltage so thought about trying to regulate the voltage and current to suit the lithium battery charging profile. i have also acquired 2 more valence batteries so could add an additional 276 ah. total of 496ah. thought that some sort of control would be wise! i will look into the master volt and wakespeed products. thanks again for sharing your knowledge.

could you suggest the make and model the controller please.

personally, i would forget what is installed and start again. it's obviously been done by an amateur with an enthusiastic mind! it's quite likely that there are other issues that you can't see that will also need to be rectified. best to start over!

i have noted all the advice, much appreciated, thankyou. I have decided to purchase 2 no victron 12/12 30 dc-dc charger which i will install in parallel. will connect a lead acid to the alternator and wire as per drawing, although this lead acid is purely sacrificial and not used as a starter battery. also i have opted for the non isolated version as all negatives are connected to the common ground/chasis. thanks again.

i have seen both these clips whilst doing research, sort of helpful, i might just drop in a lead acid, can't do any harm i guess. thanks anyway.

The biscuits, chill! its just a comment. i think that's what it used to be some 14 -15 years ago. i did say in my post "Prob not true now though" don't be so rude! perhaps you should be as kind as the other posters

The world certainly does work like that, great blog btw. liked the greggs one. very amusing.

agreed, been doing that for about 12 years

just what i heard, i agree with you, but then again if i'm paying around £1173.70 per annum for my boat license i expect to be able to do a little fishing now and then! 🐟

i get what you're saying, but i have a separate alternator purely for charging the leisure bank. wasn't a problem until i changed the lead acid to lithium. voltage to high, don't want to damage batteries or mess up the alternator

you sure you have described that right, 230 v 13amp socket and the 12 volt systems will have separate wiring systems.

lovely birds

horrible creatures!

rod and line license required to fish river, canal and lakes regardless who owns the fishing rights. private clubs etc. https://www.gov.uk/fishing-licences/buy-a-fishing-licence i believe you can fish from the boat without a permit for club waters as they own the fishing rights from the bank/towpath

it used to be that if the marina was privately owned and you didn't move your boat then you didn't a licence. prob not true now though, just renew when due and register as c/cruiser.

hi, i have a boat with twin alternators, one 75 amp for the starter battery and a separate 175amp for the leisure batteries. the leisure batteries are lithium ion. my alternators voltage is way too high for my lithium batteries, so i want to use the victron dc-dc 12/12 30 charger to regulate the current and voltage to my batteries. all of the manuals for this product show it being used to charge a starter battery and leisure battery from the same alternator. can i connect this dc -dc charger straight to my 175 amp alternator with no other batteries connected other than the lithium, what happens if the batteries built in bms shuts off, will this damage the alternator as i have not got the safety of a lead acid still being connected or would the dc-dc charger have a large enough resistance to save my alternator in this event. thanks