Hiya Cuppa

[QUOTE=Cuppa;563137]Ummmm, yes it can

[QUOTE]

Uummmm, no it can't, not unless you have about a 500 watt or larger solar array

The BCDC cannot make something from nothing so if the max output of the solar is say 6 ish amps from say a 100 watt nominal array then that is as good as it gets.

The BCDC will sacrifice current to raise the charge voltage IE say, 12 volts in at 5 amps (60 Watts) will give you say 14 volts out at 4 amps (approx 55 watts after internal losses).
You can't feed less power into the DC DC device than you can get out

Quote Originally Posted by Cuppa View Post
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I don’t really understand this. I know that there are recommendations of charging amps, generally around 10% of the battery’s capacity in amp hours, but if the battery is being ‘well looked after’ it will generally be getting charged before it is ‘over discharged’ & consequently the battery will only accept a lower charge rate regardless of the capability of the charger. The BCDC won’t force 40 amps into a battery any more than straight alternator charging would.
Yep, totally agree the charge acceptance rate is determined by chemistry and SOC of the battery but not all deep cycle batteries can handle the max current at the charge acceptance and rely on voltage limited current regulated charging.
Again, a quick check of the specs will make sure all is good.

As per the prev Q as well about AGM's under bonnet.

Quite a few of the Full River deep cycle batteries are spec'd for small charging currents (in the case of mine less than 20 amps)
They are also spec'd for lower ambients than in an Engine
We got a good buy on a heap of them at our Club a while back.
Mine are still going gangbusters after nearly 4 years in the camper
A few of the guys who put them under bonnet killed them in under 12 months

Equally tho, Full River do make versions that will take higher current.
Some manuf only make one or the other and some make both