Hmmm, I'd like to know how on earth an SCR can possibly know the manufacturers charge limit of a battery and "give it just what it wants" That truly IS a smart piece of apparatus
.
20A isn't a general limit Harry, it's something that's peculiar to that particular battery for sure and may be due to LC technology? If so then anyone with a system like yours and Trev's or has a B2B and going for LC needs to make sure their chosen battery is compatible. In a conventional MH/ caravan setup there's enough resistance in the system wiring, connectors, relays, fuses, etc to limit the current substantially, after all there's a (20A?) fuse in that charging circuit so that's an indicator of the expected current so I wouldn't expect an issue? Maybe there is??
Dunno Neil, I only stumbled across it because I used a pair. They are certainly quite secretive about it, nothing in the sales bumf and nothing in the technical PDF either, just a sticker on the battery. As it happens I had a 40A B2B so it was fine with 2 batteries in parallel. As I've said in a conventional system I think things could get close but folks would probably be ok? Dunno, never actually measured charge current on a system using a plain old SCR, the wiring resistance would be the governing factor and that would vary depending on how it was converted from vehicle to vehicle.
My Geist came from the factory with a 50amp fuse at either at starter and leisure battery end with a 2 amp fuse piggyback both ends that was d+ for the relay in the EBL
That won't work Harry. You need to sort something out properly or choose another battery. A 20A fuse will pass well over that for a long time before failing from fatigue.
Yes Trev that would work but like you say with a 80A alt you'd need 4 batteries in parallel to share the current. Cheaper to fit a B2B or simply use a battery with a higher current tolerance.How about fitting another battery to split the alts charge down a bit between say 3/4 batts, on my yogie that would be 20ah into each.
My problem and i solved it was the fan belt would and did snap due to a sudden big load, so after going a we bit down the road at higher revs i hit the switch and all is well.
I have been thinking of getting all the pulleys of the later van which are the wide multy rib type.
Something wrong there Harry.
No my alt goes to a old school droper diode, then a cable to starter bat and one to footwell les battery as from the makers of the bus, it was only charging 13.6 ish and all the bats when i got it were fooked.Is Trev’s system not cable from alternator to starter battery then cable from starter to leisure battery? Not really thought about it but I thought that was the correct way and stopped full amp charging due to battery resistance.
Edit: thinking about it though that’s why you would limit charging by reducing cable size and increasing cab,e length so my initial thought was wrong. Great having goldfish brain
33A going into starter battery. Yes I believe the leisure battery is knackered which was the point of the original post. Definitely not the decimal point. my first thought so checked that. 8A going into leisure battery which is down to 8V. Engine revs seem to make little difference. Maybe I had better go back to ordinary lead acid. Any recommendations? My first thought is Banner which has served me OK in the past and which I know fits. However, needs to be maintenance free as so difficult to access for maintenance.
I've checked a few up to the £280 mark and they all have charging current restrictions. This one https://www.alpha-batteries.co.uk/12v-leoch-pure-lead-carbon-plh-c100-deep-cycle-leisure-battery/ has a 30A limit and frankly looks like a superior battery to the cheaper Leoch ones.