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When the BMS opens, or you pull the batteries apart in a flashlight, doesn't that make an open circuit? The current and voltage drops to Zero, like turning off a switch, since there's no longer a complete closed loop? Each battery would have their own respective votage across the posts (48v or...

Hi, at first read i was thinking 'yeah, the BMS has to have 96V across it". But now I don't understand why. If you have two 48V batteries in series, you still only have 48V potential across each battery, right? zero to 48V across the first 15S and 48V(-) to 96V(+) in the second. The BMS would...

So just to clarify... Theoretically, is there any reason I can't use a 30S 96V BMS and use two 48V chargers one the 1-15S cells and one on the 16-30S cells? I guess I need two BMS circuits, one for each charger connection... not sure how to connect that.? I understand that balancing cells may...

It's a catamaran and will be a live-a-board and not that expensive comparing the cost of just an 80kWh battery pack! I have looked at 48V motors and they seem to top out at about 40hp/30kW, which would be marginally okay. But I'm under the impression that 48V drive would be significantly lower...

Disregard my above comment. I didn't get through the whole thread before I posted. I am curious why you went with 96V with such a low power output of 12kW motor? I am looking to do a very similar thing and finding 96V battery packs expensive and/or from China, compared to the 48V packs. Also...

Yes, doing everything in 96V is possible but maybe not so simple/inexpensive. The EV cars use AC chargers connected to the grid. I'm charging with DC solar. I am not aware of inexpensive 96V MPPT inverter/chargers like you can buy for 48V. And I'm looking at 12kW to 16kW of solar, so I will...

Okay, The problem we are having in communication is semantics and my fault probably. I don't consider the BMS as part of the "battery", since for ex. lead acid batteries don't include BMS. I generally think of them as 2 parts, where the BMS is connected to the battery. The battery being a...

I wouldn't charge without BMS. I guess my issue is understanding why the BMS cares what's outside the battery. It knows is what current and voltage is at the +/- posts, and battery internals... So why does it matter to the BMS if the battery is series or parallel? Doesn't it just see a...

OK I answered my reply to rmaddy above... Yes per batterytender.com see below... So How do I safely/cheaply do this with a pair of 'standard' 48V batteries and a pair of 'standard' 48V chargers?

Can we dumb it down? The electrons in the wires don't care what the batt chemistry is. My Victron charger has LiFePO charge profile and no 'smart BMS' connection. While I understand it is stupid and dangerous, theoretically you can charge the batteries with no BMS... Do the Chargers care if...

I am planning a solar/electric powered boat. The plan was a pair of 6kW arrays, each running through a EG4 6500W inverter/charger to a pair of 40kWh, 48V banks. The problem is the 55hp, AC-20 motor is to be run at 96V. So, I THOUGHT I could run the two 48V banks in series BUT EG4 support says...

Use a 20hp outboard $4,800, which is 48V and allows standard 48V inverter chargers which are cheap. like the ~$750 EG4 6500W unit. You really don't need 96V for such a low power application. It's going to drive price up with very little gain...