Sounds like a good deal, but make sure you are getting the right size charger. How big is your house bank? If it's big, like 300 to 400 amp hours, then a 40 amp is OK. If you only have one house battery, say only a Group 27, it'll be too big. The charger in amps should be between 10% and 20% of the house bank in amp hours. Max is 25% because beyond that the batteries cannot accept any more charge.
The overworking stuff you heard is nonsense. If you buy too big a charger for your bank it'll not add any charging capability to the battery bank, the battery bank just can't accept more than that in a short term intermittent charge. The issue is to keep within limits of the time to you have to charge and the size of your charger and bank, that simple. If you have a big bank and a 40 amp charger, it'll charge twice as fast as a 20 amp charger, but do you need to do that? How do you use your boat? Are you plugged in all the time except when day sailing? Or do you motor and anchor out a lot and depend on fast short charges at fuel docks or visiting marinas? Another case of your boat - your choice.
Either get the bigger charger and add to your house bank, or buy a smaller charger. All of the recommended Statpower chargers are 20 or 40 amps. Others make 30 amp models. The newer Charles units, based on my research, previously posted, seem only recently now to be OK. One of our members posted that he had a recall Flyback experience that he said was OK. For close to $288 you could get a Statpower 40, and, for sure, a 20.
If you haven't, please download and read the Ample Power Primer at www.amplepower.com. All you ever need to know about batteries, among other sources. Also see Jim Moe's Electrical Systems, Part II at the Projects page of the main website at www.c34.org/projects/projects-electrical-system-upgrade-2.html You could also do a search on "Charles" and find all the previous material we've discussed here, and it sounds like you may have already done that. (Charles also finds names, so stay with it!)
It's not only the charger, it's the entire electrical SYSTEM you're dealing with.
PS What's your hull # and year?
The overworking stuff you heard is nonsense. If you buy too big a charger for your bank it'll not add any charging capability to the battery bank, the battery bank just can't accept more than that in a short term intermittent charge. The issue is to keep within limits of the time to you have to charge and the size of your charger and bank, that simple. If you have a big bank and a 40 amp charger, it'll charge twice as fast as a 20 amp charger, but do you need to do that? How do you use your boat? Are you plugged in all the time except when day sailing? Or do you motor and anchor out a lot and depend on fast short charges at fuel docks or visiting marinas? Another case of your boat - your choice.
Either get the bigger charger and add to your house bank, or buy a smaller charger. All of the recommended Statpower chargers are 20 or 40 amps. Others make 30 amp models. The newer Charles units, based on my research, previously posted, seem only recently now to be OK. One of our members posted that he had a recall Flyback experience that he said was OK. For close to $288 you could get a Statpower 40, and, for sure, a 20.
If you haven't, please download and read the Ample Power Primer at www.amplepower.com. All you ever need to know about batteries, among other sources. Also see Jim Moe's Electrical Systems, Part II at the Projects page of the main website at www.c34.org/projects/projects-electrical-system-upgrade-2.html You could also do a search on "Charles" and find all the previous material we've discussed here, and it sounds like you may have already done that. (Charles also finds names, so stay with it!)
It's not only the charger, it's the entire electrical SYSTEM you're dealing with.
PS What's your hull # and year?