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Wow lots of you seem to have 20+Kwh of batteries where as I've just saved enough finally to get a 5Kwh LifePo battery after struggling with lead acid. :)

MPP in Taiwan do seem to want to support their genuine products (lots of fake rebadged out there), they will opt to send out a replacement board rather than a whole unit replacement but of course you need to be confident to do that swap out. They do sometimes send you round in circles with more...

Ideally charge each battery separately first using a 12v charger and get them to same SOC. Now wire each set of two batteries together in parallel (2 x 12v batteries connected with + to + and -to-) to make them 2 packs at 12V (200ah) and leave them connected like that for 24 hours to allow them...

I really don't want to burn my house down but surely if you a proper rated 2 pol DC breaker then you should also be able to use that to isolate PV for the odd occasion that you might need to do that, I'm not talking of using this like every day as I don't need to do that so just say once or...

Does that tally with what you open voltage (Voc) of each panel is supposed to be x4 of course? Voltage from panels should vary depending on if sunny or not etc. It does seem high however unless your panel Voc for each panel is above 100v.

Thanks that seems to be the case with me but wondered if there was a way given the inverter is storing historical fault data. Apparently with my MPP, I can pull historical by plugging in a usb stick and holding esc key to access the logs menu but this does not work.

This isn't my pack (i'm 48V) and was just a quick diagram but yes I'd defo put one fuse on the main neg of the pack.

Had my 5.12kWh rack battery from Fogstar for a few weeks now and I think its fab, they have done a superb cell match and I've had great customer service for the few questions I've had as well. Well done Fogstar A++

I wouldn't advise this, you need 4 really to do what you want otherwise its really unbalanced. They should always be in groups of even numbers.

Its difficult to say for sure without knowing the exact inverter being used. My inverter if connected the way this one is described wouldn't be giving any output to loads or grid as my inverter requires that either AC-out 1 or 2 is to feed the loads whilst AC-in is only to give power to the...

Thanks again, you are a star. Found a UK supplier now. :)

If just LifePo4 cells and not a battery that already has a BMS then its fine. If already a complete battery with BMS then you could always remove the BMS from each 12v battery set and then wire all in series adding your own 48V BMS.

Thanks for your response. Yes I balanced the pack by charging all individually first and had set it to 20A as somewhere in the range of 10-26A was recommended by someone in the lead acid battery group with 15 as probs the best option but don't have that option and so did 20A. I've now just...

He does not need to inform with an off-grid with grid backup. Grid backup essentially takes power from the grid on AC-IN but does not connect to feed back to the grid providing he has not connected the AC-OUT to a panel that is connected directly to the grid. If he has connected is distribution...

Don't think orientation matters for LifePo4 battery banks. From my reading they can be mounted any way that fits in with where you want them providing connecting wires all equal.

Thanks for the advice. Having done some more research on the poss of a separate earth rod, it seems that to get full TT which wasn't my intention is very difficult to properly do anyway given the 10M away from any underground metal water pipes etc. I was thinking more of the extra ground rod...

Be warned that you will need a small sized micro usb stick and it has to be OTG. MPP said less than 4GB and ideally 2GB.

Oh thanks so my maths does work, well almost as I was out by 0.15 degrees :)

Are you saying you are getting 5Kwh 48V LifePo4's for $550? If yes then can I have a link as the best I'm getting is around £1000 if I self build and just order cells and a BMS or £1,350 for a pre-built 48V LifePo.

So with your back to grid set at 48.8v, what sort of useable Ah's are you getting? My 49 is as close to that as I could get. Are you saying I should set my back to grid to 44v in order to use approx 50% of the bank as generic reading suggest 48.8v as you have yours set? Or just that I should...

I agree that at least some of the crimps in mine are also not correct. The other thing with mine is that the on/off is the wrong way round lol.

I'm sure this has been asked many times but can't find any specific posts. Just wanted others experiences of panel production in winter. Been live for just over a week, currently I only have 1.5KW of panels mounted with another 750w's to add soon. The highest I've seen the inverter report is...

Thanks again, I have tried 5 set to Flooded before and again and it does the same but is worse as it locks most the settings, tried it both with its default settings and then again with settings that could be altered etc. but with same or worse result. I purposely set my my 13 - Back to battery...

So having just gone live with an MPP6048 inverter setup I would like some better monitoring than the IMO rubbish WatchPower app. If poss I'd like a free app that can connect to the unit on its wifi connection as don't want to run cables etc. Just something that does actual live or very near...

Sounds like a good plan and will avoid any possible DNO requirements. Just make sure that if you are having a transfer to full grid for winter etc and that needs to completely bypass because the AC-out of your solar inverter could not cope due to demand being over the max amps. Then that must be...

Either swap the fans for whisper type or enclose the inverter in a cabinet/box with air grill as that should quieten it down without blocking the cooling etc. Wrapping it could actually cause heat buildup issues esp if in a warm climate, might get away with it without issue in colder areas though.

Got all that stuff except the charger to charge at 4 volts, so will factor that in thanks.

Hi all, Some replies are saying I need to set my cutoff to 44v but it doesn't seem clear if that means I should run my batteries down to 44v e.g set back to utility setting to 44v or just the emergency cut off setting. Can this be clarified please? Also I'm planning on individually load...

Thanks for your detailed explanation that really helps ?

It definitely seems something to do with when battery starts to charge from solar at day break as the system runs fine all day but starts tripping first thing in the morning as the sun rises. This only seems to happen if I have charge from Solar only set. If I have Solar First or Solar and...