Recent content by bluenomads

We will have multiple 48-12, so using single 48v wire to local busbar, then individual 2-pole MCBs (could use 1 pole of course) to wire inputs (10A for Orion 20, 16A for Orion 30), then orion's, then a multi-circuit blade holder box on the output with blade fuses (25A for Orion 20, 40A for...

I've had no problem with the cerbo bms comms - I have the same bms. I get full data, and it's passed through to the mppt. Except today, when I lost comms and can't get it back. Be careful with updating the cerbo version, I'm not sure it was responsible but... Agree with your 2. I had a single...

Grrr. So now a) the bms says two cell sensors can't have their resistance calculated, b) the BMS-cerbo CAN now won't connect, and c) the basic bms controls of chg, dischg and balance don't work! Turn discharged Off and it's still discharging! Balance On yet no balancing. Has anyone else had...

Awesome suggestion! I'll try tomorrow.

Has anyone else has failed 485 to PC connection? The BMS board seems fine as the BMS to Cerbo CAN works perfectly. It's just I can't update the BMS using a PC. I've watched how Andy did it, and have tried permutations of dip switch, two different 485 to USBs, and cat 5 cables. The PC with JK...

Thanks for the reply. Voltage reading difference is with BMS on or off. But, you are right about the Discharge: 4V out when disabled but "only" 300mV out when enabled or 0.6% loss in the BMS. So I've got voltage thank you! Any idea why the 300mV loss through the bms when it's on and discharge...

New 200a JK inverter BMS. Connected in 16s all ok and showing up in their app fine. But there's a 4v (not mV!) loss between the negative terminal going in to going out of the BMS. 52.72v from positive battery terminal to BMS in, and 48.18v from positive battery to BMS out. You can see where I'm...

Ah yes, I didn't catch that missing bit. I'm not quite as far along although I've bought the same unit but not connected anything. If I get to it sooner, I'd attach the contactors without load and measure the current through to them from the BMS. I saw that there are 3 contactors, with the...

Have a look here - https://diysolarforum.com/threads/jk-b2a25s60p-500amp-bms-how-to-connect-to-battery-power-leads.44494/ Has some English diagrams that may help.

Great. Thanks everyone. 4/0 it is for 300a, and motor decisions still pending!

Hey Yabert, you're right! The Bellmarine EVO was the one we were looking at! When I did research a few years ago, there seemed to be many more, but can't find them now. Kudos to you. I'm wondering if the change (as I perceive it to be) is that for 15+ kW you really do need to be at higher...

Most motors in the 10-20kW, even up to 30kW, are 48V: Quiet Torque, Bellmarine, Elco, etc. Rare to find one under 6-20kW at other than 48V. Note that these aren't outboards for pushing a dinghy onto the plane (although many of those are 48V as well), they are for yachts and motor boats up to...

Thank you everyone for the comments, they help. I can get the 120sqmm so will go with that. Ancor is not easy to get here unfortunately. Our local Springers have a 120 but it's rated as "Maximum operating temperature: 75°C in normal Use OR 105°C where not subject to, or protected from...

For the boat, the electric motors will likely be 48V DC, 20kW, but we'd only ever run 15kW continuous - partly because of the battery pack, but largely because we want range not speed! Battery is 48V, 16S 304's, and at 1C can produce 15.6kW at 52V (for about 80% of an hour or 48min; we'd almost...

Thinking of the same b5a as we may need cont discharge greater than 200a (boat motors plus other boat functions). I'd probably be happy with 300a, but can't find a BMS of that size for 16s - are there any good ones out there I've missed? Otherwise, how has your b5a been going?