Northland

Results from bus soft start are suspicious: R251 - 0.8R D73 - 0.46v D53 - 0.47v R215 - 0.3R R245 - 22R Q6 - GS 1.17K. GD short. DS OC D65 - 0.001V 2.7R U16 - 5-7 1.79K 5-6 1.19K TX2 - 2.7R

Of those who have had an MPP SOLAR product develop a fault, what was your experience with them? I have found them to be evasive and uncooperative. Back in January I noticed a little smoke, so I filled in one of their forms and supplied the extra information. No response. The inverter kept working so I didn't bother chasing it up. A few weeks ago the 230v stopped outputting so I filled in a form again. 3 days passed. Their website says 24-48hrs response. So I told them if they were going to ignore my request for service once again I was going to take to the forums to warn people about the lack of warranty. I got an immediate response, was sent some pdfs for disassembly and diagnostics. I spent several hours doing that and emailed them the results. 6 days since, no response and I'm really pissed off!

Question: Since I have a bunch of 3.2v cells on the way, and my old 12v 1kw model (I don't know what the axpert equivalent is) is in storage with 1kw of 12v panels.... I wonder what the max battery voltage could be. To use lifepo4 would require a firmware update anyway. It's pwm model so between 13v and 20v is wasted. So why not make it 5S = 16V? 3.6v charge = 18v. The caps are 35v and the fets 60v. Why? 1. Back up inverter 2. Extra pv input (50A x 18v = 900w) 3. Can put all night loads (fridge, TV, lights) on this inverter 4. Can put the 4048 (aka axpert) to sleep saving 35w (well 20w really since the 1kw uses 15w) 5. Extra inverter capacity Possible?

Wetkit that won't work. The inverter mppt needs to be made redundant (I'm certain it does nothing anyway). It can't allow 2 lots of pv to flow through while also independently optimizing the 3rd. They could feed into the batteries but this is less efficient Does anyone have better than 10% pv output on rainy day? Pwm gives 10% while mppt should give 30%

Some have said that the inverter maximum pv input is 3kw. This is not true. This 3kw figure is a guide only, derived from the estimated battery voltage of 50v x the actual limit of 60A through the charge controller. I personally have 4.5kw on mine. The most I've seen on the display is 3.36kw. That's 60A x 56v. If my charge voltage was higher, that would increase. Those who have lifepo4 batteries will see up to 4.032kw (60A x 67.2v). The charge controller truncates anything over 60A. And now a question. If I have 18 panels. 6 West, 6 East and 6 North. Would I see any improvement if I installed 3 x 20A mppt controllers (actually 3 x 30A since I have 4.5kw) ? Has anyone verified whether the mppt in this unit actually improves pv output?