Off-grid solar + wind in parallel?

This not very (home) diy but.... I'm in a hobby club which needs 12v batteries charging in the clubhouse for equipment. We've no mains electricity, so use solar panels coupled with solar-suited chargers. With this recent 'nuclear winter' they're not getting charged much so I was wondering about having a wind turbine power source too.
Solar charging isn't something in my breadth of electronics experience, but I have gathered that solar panels and chargers - esp. MPPT - kinda interract with each other for operation/efficiency? So I don't know if a wind turbine can be simply Wire-OR'd into a charger supply, or does it need something intelligent...?

I played with solar panels in the 80s on the Falklands, which should with wind their been great, but it was rather disappointing. He got one propriety wind charger, and it was rated at 15 amp, but lucky if you got 3 amps.

I would ask about this on a narrow boat forum as they use them a lot.

What I have found the problem was hinged around was the charge rate of lead-acid compared with lithium batteries. You say 12 volts, so I assume lead acid?

For the faff involved the easiest option might be to just sling in a second battery and maybe solar panel to up the capacity. Have you worked out the power budget and how well it's matching up with the charging capacity? You might just need a bit more headroom.

Since the 90s things have moved on, the main change is the lithium battery. The main difference is the charge rate. In the main, a lithium battery with charge 2/3 of hour rate and discharge at the hour rate. But lead acid can discharge fast, but the charge rate is rather slow.
This was the graph from charging my car battery, and although when reasonably discharged it recharges well it drops off very fast.

ericmark said:

This was the graph from charging my car battery, and although when reasonably discharged it recharges well it drops off very fast.

Click to expand...

What was the capacity of that battery, and was it more-or-less 'flat' before chargng?

The capacity 40 Ah Honda Jazz, had been left for a few months without use, and battery was fully charged with a smart charger, the energy monitor has warped the results a bit, should have been straight lines. It was a stage charger.

The MPPT is likely a pulse charger, these are better when the battery is being used at the same time as being charged, but what ever charger we have a problem with lead acid, that as it nears 80% charged the charge rate drops, so we are looking at more time to charge to daylight hours.

The lithium battery can charge much faster, so a unit like this can connect to solar panels and charge a lot faster, but in the main the battery is not used direct, an inverter transforms voltage up or down the 5, 12, or 230 volts, so even with no load, it uses some power.

My inverter will allow either grid or generator connection, not both, I use it in grid mode, in generator mode I think it can be set so when batteries are below a set level it will start the generator and run it until it reaches a set charge level and switch it off again, so the generator only fires up when not enough sun, and for a short of a time as possible. To do the same with lead acid the generator would have to run for an extended time.

But to dump lead acid and move to lithium is a high cost, if installing from scratch then OK, but with the lead acid already existing, a Rufford wind charger may be the answer. But noise is the problem, I would suggest join a narrow boat forum and ask there, as it is something they do a lot, walk along the cut and you see many narrow boats with solar and wind.

What I would be looking at is a Hybrid system, but as it stands we have no idea of scale, a battery bank as found in telephone exchanges is very different to what would be used in a caravan. Some building today do seem a bit OTT road included for scale, this is basic a large shop, and that is a massive array compared with my own house and we have as it stands no idea to if a 60 Ah battery or a 600 Ah battery bank or larger.