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Subject Topic: Solar or B2B CHARGER 🤔
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via mobile 30/10/2023 at 6:28pm
 Location: glasgow
 Outfit: conway olympia camper
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Hello everyone
I am ready to add off grid charging for my 2 x 110amp leisure batteries
Problem is I am going round in circles trying to choose a source
Ie solar panels or a DC 2 DC charger I currently use a split charge relay but have been reading some concerning posts regarding the relays damaging vehicles alternator. My alternator did pack in on summer vacation on M1 smart motorway at watford gap. But I put it down to bad luck. Not so sure now was it the split charge relay. Any advice really appreciated.


30/10/2023 at 9:38pm
 Location: East Herts
 Outfit: 1992 Elddis Wisp 450CT + X Trail
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I would be inclined to go with solar panels.

Regarding split charging relays, I have used the system several times without any hint of a problem. I used it on 3 different river cruisers, all installed by me, and the last one was quite a complicated system as the boat involved had twin engines. Alternators can pack up at any time, as can any other device, probably nothing to do with the relay. I have had a couple of alternators fail on different vehicles over the years and neither of them was fitted with split charging.

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Best Regards,
Colin


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via mobile 30/10/2023 at 10:44pm
 Location: glasgow
 Outfit: conway olympia camper
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Thanks again for advice I tend to agree re the solar panels. 👍


via mobile 11/11/2023 at 5:02am
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Solar panels work in sunlight, they don't work so good in darker conditions. B 2 B works great with engine running but does nothing when engine off. So I reckon it would depend on when you want to charge your leisure battery. For the record, my van is fitted with both.

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Why am i doing this instead of camping??!!


11/11/2023 at 1:33pm
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Kinda makes sense.

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12/11/2023 at 10:32am
 Location: East Herts
 Outfit: 1992 Elddis Wisp 450CT + X Trail
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I can't see what is wrong with split charge systems, I certainly never found any problems with them. I would use solar panels but keep the existing split-charge system.

B2B charging seems to me a bit like an expensive solution to a non-existing problem. "Keep it simple" is usually my method.

-------------
Best Regards,
Colin


via mobile 12/11/2023 at 10:57am
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If you have a van that is fairly modern ish it will be fitted with a "smart" alternator which for reasons you can research online means a split charger will not work effectively. A b 2 b gets round this problem. As a bonus I believe the b 2 b will monitor your leisure battery and cut off charge when battery is full. Some can even be used to charge gel or lithium batteries. But on an older van without smart alternator a split charge system would be adequate and a bit cheaper.

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Why am i doing this instead of camping??!!


via mobile 12/11/2023 at 12:06pm
 Location: glasgow
 Outfit: conway olympia camper
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I was happy with my split charge relay. But reading more and more posts saying they are bad for the alternator. And as my alternator packed in on way to France costing me £400 to have new one fitted I was thinking was this just bad luck or was it the split charge relay. So I have disconnected it at the battery for now.


12/11/2023 at 3:05pm
 Location: East Herts
 Outfit: 1992 Elddis Wisp 450CT + X Trail
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Quote: Originally posted by parkranger on 12/11/2023
I was happy with my split charge relay. But reading more and more posts saying they are bad for the alternator. And as my alternator packed in on way to France costing me £400 to have new one fitted I was thinking was this just bad luck or was it the split charge relay. So I have disconnected it at the battery for now.



I don't know much about the new "smart" alternators, but I can't see why split-chargers are bad for alternators in general. I would say that your alternator failure was just coincidence and nothing to do with a split-charge relay. The first split-charge system I installed was on a Mk2 Cortina, which I had for many years and used for towing a Sprite Musketeer caravan. Never had a problem with that. It was then the only way I had of charging the caravan's battery, as we never went on a site that had EHU, and solar panels weren't an option back then. I have fitted split-charge systems on boats, again no problems, and to several cars, without problems. The only alternator failures I have had so far have been on vehicles that weren't fitted with split-charge systems.

When you are charging your leisure battery using a split-charger, your alternator just "sees" both batteries as one large battery, so I suppose it could put a slightly heavier load on it than standard, which could possibly cause it to fail slightly earlier than it would have done otherwise, but it's doubtful that it would really make any significant difference. Chances are that when your alternator failed it was on its way out and would have failed very soon anyway, even without the split-charge system.

-------------
Best Regards,
Colin


12/11/2023 at 7:44pm
 Location: West country
 Outfit: Mondeo
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Not sure it's as simple as you say Colin. Not sure how the split charger splits the charge. Bear in mind the two batteries may be at different states of charge so providing a different voltage feedback to the alternator. If they are smart, they will sense the battery voltage and output charge to suit that level of charger smart requirement. How can that be determined for two different battery states.

So how does the split relay thingummy send it to two different batteries.


Maybe could send some to one battery for a while then switch it to the other. I don't know.


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12/11/2023 at 10:09pm
 Location: East Herts
 Outfit: 1992 Elddis Wisp 450CT + X Trail
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When the split-charge relay is energised it effectively connects the two batteries in parallel. The alternator will sense the lowest battery and send the bulk of the charge to that one until the two batteries balance out. Once the engine stops the relay drops out separating the two batteries so that the domestic equipment cannot drain the starter battery. A very simple system but effective. No fancy electronics to go wrong, and if the relay fails all that happens is that only the starter battery gets charged.


-------------
Best Regards,
Colin


via mobile 12/11/2023 at 10:44pm
 Location: glasgow
 Outfit: conway olympia camper
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Really appreciate the impute guys /girls
The mechanic who replaced my alternator said an old oil leak had been contaminating alternator and could have affected life span. It's really a. Minefield camper van electrics. So much to consider. Problem I think is starter battery is always in a total different state of charge compared to leisure battery. As its a different animal altogether.. Driving me crazy.



13/11/2023 at 11:29am
 Location: East Herts
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Quote: Originally posted by parkranger on 12/11/2023
Really appreciate the impute guys /girls
The mechanic who replaced my alternator said an old oil leak had been contaminating alternator and could have affected life span. It's really a. Minefield camper van electrics. So much to consider. Problem I think is starter battery is always in a total different state of charge compared to leisure battery. As its a different animal altogether.. Driving me crazy.




That is exactly what finished off one of my alternators. The power-steering reservoir on my Volvo V70 was directly above the alternator and power-steering fluid had been dripping from a split in the return pipe straight onto the alternator.

Yes the batteries will be in a totally different state after a stay off-grid, but it never seems to have mattered with any of my set-ups. On my last boat I had one starter battery, used for starting both engines, and two 120ah leisure batteries in parallel. These powered all the interior lighting, water pumps, navigation lights, radio, fridge etc. The split-charging system I installed coped perfectly. It was vital to keep the starter battery fully charged, as you can't push-start a boat.

-------------
Best Regards,
Colin


13/11/2023 at 7:14pm
 Location: West country
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If the two batteries are in parallel there will be a common single voltage somewhere between the two. Current will flow from the highest charged battery to the lowest charged one as well as power from the alternator.

It must sense the voltage of both batteries and only charge the lower one until they equalise.


13/11/2023 at 8:02pm
 Location: East Herts
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Quote: Originally posted by navver on 13/11/2023
If the two batteries are in parallel there will be a common single voltage somewhere between the two. Current will flow from the highest charged battery to the lowest charged one as well as power from the alternator.

It must sense the voltage of both batteries and only charge the lower one until they equalise.



Absolutely right Navver. That is what happens. If you have a decent alternator the batteries will soon charge up.

A bit more complicated on my last boat with two engines and three batteries. Either engine could charge all the batteries, so if one engine failed when we were under way, all the batteries still got charged.


-------------
Best Regards,
Colin


via mobile 14/11/2023 at 12:33pm
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The replies are really helpful.. The last few posts refer to boats.. Did you guys use split charge relays or DC 2 DC chargers via alternator. To charge your leisure batteries.



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