Search results

circuit breaker and fuse testing. lots of bad breakers out there and there's the debate over class T vs. ANL etc. would be cool to compare LFP vs. AGM/FLA, too (as that goes towards AIC ratings). Probably would have to run some of those tests multiple times each. Over-current as well as full...

I agree, stick with what's working. In my RV my primary battery is 48 so I need 12v, too. I would have built it with a 48/12 converter but the jacks and slides require 100-150 amps alone and would have been difficult to source a good converter capable of that kind of amperage... PLUS, you're...

No. There's a long discussion on this somewhere else (perhaps even this thread) about it. It can be a tricky concept to grasp, but that's not how physics works.

Yeah in the DIY world I imagine it's largely irrelevant ... but having watched some power plant startups and reading the article above, (@timselectric correct me if I'm wrong) it's essentially about inverters that can join a grid (follow) versus inverters that can black-start (form) a grid. The...

From the exterior cell casing to the chassis -- that's the hot spot and there's melted plastic blue cell wrap on the chassis frame. chassis being negative ground comes back to the battery and completes the circuit.

From my system build parts list (https://diysolarforum.com/members/cinergi.12721/#about) -- fuse holder, fuse, SSR driving a contactor -- all 48v. https://www.mcmaster.com/7687K11/ https://www.mcmaster.com/71385K28/ https://evolveelectrics.com/products/gigavac-mx14?variant=37170227076...

FYI Victron has told me and I can find reference (e.g. https://community.victronenergy.com/questions/169042/multiplus-ii-current-values-inaccurate-when-compar.html) that the AC current/wattage metering built into their inverters is NOT sufficiently accurate for discussions such as the one in...

Look at the floor of the area where the cells were. ONE cell got very hot. Now look some more - there's a metal frame there. There's some blue plastic from the cell there. My guess is the cell shorted out against the RV frame.

Power Assist uses a setting called Boost Factor to help prevent surges (e.g. air conditioning turning on) from blowing the breaker / overloading the generator. I have seen it cause underutilization of the AC input (generator in your case). See...

You may have been right around the load where the Power Assist setting (default is 2, I think) was kicking in. I've noticed this type of behavior before when I was on the edge of 50% of the configured AC amperage limit.

I haven't done anything in nodeRED but this reminded me of this recent announcement which is closely related: https://www.victronenergy.com/live/drafts:dynamic_ess

This is exactly where closed loop shines and is helpful in my system. As I approach 56v (3.5vpc), I usually have 150+ mv of difference and the closed-loop comms helps back off the current so that I don't trip the cell high-volt and disconnect my battery.

Yup, I did the same thing early in my build process.

I disagree on setting the shunt's Charged Voltage to the same as Absorb. Set it 0.1 volts lower. Why? 1) https://www.victronenergy.com/upload/documents/SmartShunt/9172-Manual_BMV_and_SmartShunt-pdf-en.pdf -- this actually recommends setting it to 0.2 to 0.3 volts lower than float but that's...

yep -- that's why. SCC Absorb is 14.02 .. less than the shunt's 14.2 ... so I'd set the shunt to 13.9

I don't think I've seen your SCC config here, so I don't know what their bulk/absorb voltage settings are. Like chrisski mentioned, the shunt needs to be set just below (0.1v) the absorb voltage of the SCC so that the shunt sees that the battery has reached that voltage with less than 4% of...

if your SCC/charger configuration isn't set to charge the battery above 14.2 volts (the 'charged' voltage in your shunt config) and hold that sufficiently long for the shunt to consider the battery charged, it won't automatically re-sync to 100%. That's why the charged voltage and the 'tail...

Yeah bummer. It works in closed loop / battery communications / DVCC scenarios -- surprisingly -- however. am glad to see that, but it's too bad it's DC only. That's only like 50 watts for me lol

The BMS made it obvious in several ways ... 1) it shows the calculated IRs of each cell and they were climbing at different rates, 2) it reports State of Health and it was degrading (due to IR), and 3) the voltage graphs of each cell were varying more and more wildly during charge and discharge...

Different chemistries with different curves and usage characteristics altogether. I wouldn't compare. 1 year into my system (280Ah LFP cells), I tested to 99% of my original capacity.

Be careful with this method -- you will put a lot more physical stress on the cell terminal this way. I've seen vendor documentation that says NOT to attach these directly to a battery -- but I suspect that was more due to ignition problems with batteries that produce gasses.

Oops! Missed that. Are the individual components of your current box capable of handling the current? If so, there's no point in continuing to use it, no? (e.g. what's the difference between that and making your own) Are your strings 16.5 amps because you have panels in parallel before they...

It will take a lot longer for the BMS to balance when full and it's much more likely you'll go out of balance. But as long as your charging voltages aren't aggressive and your BMS is up to the task, you'll probably be OK. Keep an eye on your voltage differences when full; you may need to get...

This is what I just recently installed: https://www.amazon.com/dp/B0BVCZTMXP

In this case the MPPT's solar input would be connected to the 48v battery.

Would still need a battery (even if required amps was < 35) but that would theoretically work. More $$ than the Orion though. On the other hand, the Orion 48/12 doesn't have multi-stage charging. Single-voltage output only.

I have a victron orion 48/12 30 amp keeping a 100 AH LFP battery that I already owned floating ... the converter covers all my DC loads except jacks and slides which need 120 amps.. so the battery covers that momentary excess load. Plus that 12v battery covers the emergency breakaway situation...

Yes, if they're *exactly* the same model (not all 3000's are the same - cpu differences, for example... there are exact model numbers at play here), running the same software, and you configure them to run in parallel (and one N-G bond like you said). Same length wires from the 3000's to the...

That looks like what happened to my flat-mounted panels on my RV roof where rainwater collected and slowly evaporated instead of running off. Didn't cause any performance issues.

Not likely but I'm far from knowledgeable in this particular area.

I didn't connect it. On a mobile/RV install, I don't know that there's anything I *can* safely connect it to.

I liked it a lot. Just plug the MC4's in and that gets me the necessary fusing, combining, disconnecting, surge-protecting, waterproofing, etc ... far better than the solution before (wires wire-nutted together in 2 electrical boxes on the roof). Makes for easy servicing and diagnosis. Can...

haha how did I miss this post?

Coverage of the solar changes: