the transition through works fine, with the loads (including inverters) switching from battery to power supply and back with no interruption in service. when the switch is set to the house is powered by the batteries, when the switch is set to (b) the house is powered by the power supply. the chargers are connected to the battery, so they continue to charge the battery when the switch is set to (b). I now have my lithium house batteries on the side of the switch and my new power supply on the (b) side of the switch. I have a perko a/b/both switch in my panel that i have not been using (because i converted my house to lithium and my engine battery is still lead acid - so the starter and engine battery were removed from the a/b/both switch and connected directly via another cutoff switch. Some non-marine chargers are not smart enough to work this way and we see them go into a whole new charge cycle each time a significant load is placed on the DC system. This assumes a good quality marine charger meant for this kind of service. At that time it will maintain the specified voltage and it will add/subtract currrent as necessary to support the loads while the battery will net close to zero input/output amps. This is what I would do if it were my boat.Īnd like the others said there is not reason to try to disconnect your batteries and have the charger support your loads because this is essentially what happens when the batteries are fully charged and the charger backs down to float voltage. Then you only need one set of large DC cables. It may be easier and cheaper to upgrade your inverter to an inverter/charger for this kind of higher output. If you need 100a at 12v that is a pretty large and less common charger. Theoretically you could install two of them. You would benefit from even larger charger but usually if plugging into a dock you are going to be there a while so maybe 50a will do. The larger one is 50a so 2.5x the size of your 20a charger. We are quite fond of the new Victron Phoenix Smart IP43 Charger which can be programmed via Victron Connect App via Bluetooth. There is no single setting that is correct for all lithium batteries. I would get a marine grade charger that is fully programmable which is very different than "has a lithium setting." You need to be able to program the exact parameters that are required by the battery manufacturer. do any of you isolate your batteries while on shore power (so that they are not running loads at the dock and constantly cycling)? i could accomplish this with some switches, but it seems like this would be a logical feature for a battery charger. it seems like the large superyacht/industrial systems do this, but it doesn't appear that even the more expensive marine systems do this at the size i need. all of the systems i'm looking at have a mode for lipo batteries.Ģnd question - what i really want is a device that will charge the batteries, and isolate the batteries, and provide 12v power for the house while connected to shore power (and then connect the batteries to load when shower power is removed). (yes i understand the marine markup, just trying to understand if i'm missing something else here). equivalent marine chargers are 10x to 20x as much. i'm looking at a <$200 charger intended for an rv, which appears to have the same features that the more expensive marine chargers have. I see that there is an extreme range of prices for ac/dc chargers, and i don't understand why. I already have all of the inverter power i need, so i would not benefit from getting a charger/inverter combined unit. so i'd like to add a 100amp ac-dc charger for shore power. (especially since there is a constant load of 10-20 amps running). but i'm currently limited to a 20amp charger at the dock (just using the charger that came with the batteries), so if i come in to the slip with low batteries they charge very slowly on shore power. I've got a newish installation on my sailboat, 12v, 380ah of lipo, 680w of solar, charging from 170amp alternator w/ external regulator), all works great.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |