Can we use this charger to maintain our battery in our boat while the motor (electric motor) is running without harming the charger or motor?
743584
While I've never used it that way, I don't see why you couldn't. Can't think of any way that would harm anything.
2181483
Yes, I keep them hooked up to 3 batteries that power my trolling motor on my boat. They do a wonderful job and while sloppier, have lasted much better than those "boat" battery charging units that coast enough to buy ten of these. I keep three of these hooked up all the time.
1007116
Yes - to a point. The best option is to keep your batteries from becoming heavily sulfated in the first place. This charger, if used perhaps for a monthly top off in a vehicular application, should prevent that.
1509016
Manual says you can charge marine battery but you have to remove the battery from the boat and charge on shore. To charge while connected, you need a special charger that is designed for marine use.I think they are trying to say it'll work but the charger is not water-resistant.
2007930
It only charges off the alternator when the motor is running. I use a couple of battery tenders when parked on the trailer or a solar charger when I leave the boat in the slip.
577130
Most boat batteries are deep cell which may need a different charge rate than this unit can provide. Contact your boat battery manufacturer for specific charging specs. If you can use this battery tender then you can only charge one battery at a time. You also cannot leave it connected all the time it will over charge the battery after the green charged light comes on. Amazon should sell the Battery Tender quick disconnect lead that will work with this charger. It has 2 large eyelet ring connectors to the battery a fuse and a plug to the Battery Tender Lead.
1550112
I would think so Alan, but maybe ought to call Battery Tender. I leave my two boats plugged in for months at a time, and when I'm ready...they're ready...at least the batteries are!
340683
No, not recommended. If the required load to maintain the two batteries (assuming they are wired in parallel) is unbalanced, this can damage the charger. These are cheap chargers, save yourself some grief and buy two.
1482331
I bought mine a year ago and have been using a standard 12 Volt battery in my boat. Never had a problem and it does it all. I use it to steer my ipilot troweling motor.
635786
I use my solar charger in a boat to keep the automatic bilge running. The only thing I can comment upon is low light. I do know that the charger is not sufficient to keep my boat batteries charged if I put the boat on a trailer and keep it in an unenclosed carport. The carport is open on both ends (North and South) and on the West side as well. Evidently not enough sun light gets in to sufficiently charge the boats batteries while the boat is parked in the carport. There are some shade trees around the carport also that may be contributing to the issue.
247973
No. I use one for a tractor battery over the winter, 2-3 months between starts. Go for it. Maybe the battery will still be some good when you're able to get the boat in the water. Better, much better to keep battery up than to let it discharge too low. That kills batteries' life span. Especially in the cold.
2190132
You can, this charger will maintain the battery and never overcharge or destroys the battery
2149306
I installed it as a battery disconnect in a 20 foot bow-rider motorboat. It disconnects the marine starting battery for a 5.7L V-8 motor which was experiencing a parasitic discharge.
368226
I would NOT leave this on a charger. I believe that battery is meant to be run, up and down to maintain it's ability to accept a charge. Leaving it plugged in is not what it is meant to do.
706200
I don't have experience using it on paired batteries. It sounds like it becomes a 24 volt system when paired up. I have a boat with paired battery banks it uses a much more powerful charger for them. However it will work well for your main engine battery by itself. You may need a 24 volt charger if it's paired to 24 volts.
1665889
Yup! I use it on my 12 Volt boat batteries and my 12 Volt car batteries. Like it because it shuts itself off when reaching full charge. My older chargers of a different make could overcharge a battery if left on too long. It is a tad slower than some chargers, but I believe a slow charge is better than a too fast one. I disconnect it when I notice a full charge is reached and in a few months will recharge the battery if the battery is left unused. Hope this helps.
100892
I should also mention, you can not keep this or any charger connected to the battery when either cranking the starter motor or while the generator is running. While cranking the starter, the amperage required for the starter motor will burn out the charger. Additionally, if you keep the charger connected to the battery while the generator is running, you will burn out the charger and quite possibly, the charging circuit in the generator. While the generator is running, it is also charging the on board battery. The best practice is to unplug the charger connector before starting and re-connect it after you shut down. I should also mention, you can not keep this or any charger connected to the battery when either cranking the starter motor or while the generator is running. While cranking the starter, the amperage required for the starter motor will burn out the charger. Additionally, if you keep the charger connected to the battery while the generator is running, you will burn out the charger and quite possibly, the charging circuit in the generator. While the generator is running, it is also charging the on board battery. The best practice is to unplug the charger connector before starting and... » Read More I should also mention, you can not keep this or any charger connected to the battery when either cranking the starter motor or while the generator is running. While cranking the starter, the amperage required for the starter motor will burn out the charger. Additionally, if you keep the charger connected to the battery while the generator is running, you will burn out the charger and quite possibly, the charging circuit in the generator. While the generator is running, it is also charging the on board battery. The best practice is to unplug the charger connector before starting and re-connect it after you shut down. « Show Less