... issues of 240 volt generators used for charging batteries in our camper trailers...
...The charger I use is a Ctek 7000 adequate I thought, however in practice things did not work out as I expected...
The charger takes far too long to recover ...running the gennie for at least FOUR HOURS. ...We also tried the direct 12 volt charging facility from the gennie, and despite the claimed output from this source rated as 8 amps, the indication on the controler showed only 2.4 Amps via that source.
...We have a 60 watt Unisolar panel on a folding stand or fixed to trailer, this panel replaces and tops up the battery everyday without any dramas what ever, and I will be sticking to this system for some time yet.
I suspect the only real battery recharging generator, is the small Honda unit that recharges 12 volts and up to 80 amps, now that's serious charging power.
Umm... I think the real problem may be your setup, not the 240V generator
A wet cell battery will take a maximum ~20A per hour, an AGM maybe ~30A per hour and only a spiral wound AGM (like an Optima) is capable of 100+ A per hour for charging. Many caveats on the charging numbers, but you get the idea. Having a big charger is not necessarily the answer. But if you have multiple batteries then it certainly helps as the max charge amps is cumulative.
Making the assumption of you needing 40 amp/hours per 24 hours (say running a fridge), a Ctek7000 can only supply a maximum of 7 amps so willl need a minimum of 6 hours running (actually longer as the less amps go in when nearly charged). A Ctek25000 (25A) will be much quicker, but again its amps drop off as you approach 100% SoC, so still likely to need 3+ hours of running for 100% SoC.
The beauty of solar is that while it doesn't put in a huge amount of amps, it does so all day (if its sunny!). But your 60W would likely put in an average 3A per hour, so you would need 13 hours of daylight - or my assumption of 40 Amps per day is way off - or you are not fully charging your battery.
Point being, a 240V generator with multistage charger is actually the most reliable way to charge batteries, just takes longer run hours than most people think. I have 160W solar, a 25A Ctek charger, a 40A dc-dc charger and a 240C genny to charge my 240A/hr AGM batteries and have done plenty of comparisions on whats best for charging. There is no doubt IMHO that solar is my favorite, the 40A dc-dc is the fastest (if driving!) but the 240V genny is the most reliable
Cheers
Captain